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 version 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 <linux/lm_interface.h>
  18 #include <asm/uaccess.h>
  19
  20 #include "gfs2.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, struct buffer_head *bh,
  72                           struct gfs2_ea_header *ea,
  73                           struct gfs2_ea_header *prev, void *private);
  74
  75 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  76                         ea_call_t ea_call, void *data)
  77 {
  78         struct gfs2_ea_header *ea, *prev = NULL;
  79         int error = 0;
  80
  81         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  82                 return -EIO;
  83
  84         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  85                 if (!GFS2_EA_REC_LEN(ea))
  86                         goto fail;
  87                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  88                                                   bh->b_data + bh->b_size))
  89                         goto fail;
  90                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  91                         goto fail;
  92
  93                 error = ea_call(ip, bh, ea, prev, data);
  94                 if (error)
  95                         return error;
  96
  97                 if (GFS2_EA_IS_LAST(ea)) {
  98                         if ((char *)GFS2_EA2NEXT(ea) !=
  99                             bh->b_data + bh->b_size)
 100                                 goto fail;
 101                         break;
 102                 }
 103         }
 104
 105         return error;
 106
 107 fail:
 108         gfs2_consist_inode(ip);
 109         return -EIO;
 110 }
 111
 112 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 113 {
 114         struct buffer_head *bh, *eabh;
 115         __be64 *eablk, *end;
 116         int error;
 117
 118         error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT, &bh);
 119         if (error)
 120                 return error;
 121
 122         if (!(ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT)) {
 123                 error = ea_foreach_i(ip, bh, ea_call, data);
 124                 goto out;
 125         }
 126
 127         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 128                 error = -EIO;
 129                 goto out;
 130         }
 131
 132         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 133         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 134
 135         for (; eablk < end; eablk++) {
 136                 u64 bn;
 137
 138                 if (!*eablk)
 139                         break;
 140                 bn = be64_to_cpu(*eablk);
 141
 142                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 143                 if (error)
 144                         break;
 145                 error = ea_foreach_i(ip, eabh, ea_call, data);
 146                 brelse(eabh);
 147                 if (error)
 148                         break;
 149         }
 150 out:
 151         brelse(bh);
 152         return error;
 153 }
 154
 155 struct ea_find {
 156         struct gfs2_ea_request *ef_er;
 157         struct gfs2_ea_location *ef_el;
 158 };
 159
 160 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 161                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 162                      void *private)
 163 {
 164         struct ea_find *ef = private;
 165         struct gfs2_ea_request *er = ef->ef_er;
 166
 167         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 168                 return 0;
 169
 170         if (ea->ea_type == er->er_type) {
 171                 if (ea->ea_name_len == er->er_name_len &&
 172                     !memcmp(GFS2_EA2NAME(ea), er->er_name, ea->ea_name_len)) {
 173                         struct gfs2_ea_location *el = ef->ef_el;
 174                         get_bh(bh);
 175                         el->el_bh = bh;
 176                         el->el_ea = ea;
 177                         el->el_prev = prev;
 178                         return 1;
 179                 }
 180         }
 181
 182         return 0;
 183 }
 184
 185 int gfs2_ea_find(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 186                  struct gfs2_ea_location *el)
 187 {
 188         struct ea_find ef;
 189         int error;
 190
 191         ef.ef_er = er;
 192         ef.ef_el = el;
 193
 194         memset(el, 0, sizeof(struct gfs2_ea_location));
 195
 196         error = ea_foreach(ip, ea_find_i, &ef);
 197         if (error > 0)
 198                 return 0;
 199
 200         return error;
 201 }
 202
 203 /**
 204  * ea_dealloc_unstuffed -
 205  * @ip:
 206  * @bh:
 207  * @ea:
 208  * @prev:
 209  * @private:
 210  *
 211  * Take advantage of the fact that all unstuffed blocks are
 212  * allocated from the same RG.  But watch, this may not always
 213  * be true.
 214  *
 215  * Returns: errno
 216  */
 217
 218 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 219                                 struct gfs2_ea_header *ea,
 220                                 struct gfs2_ea_header *prev, void *private)
 221 {
 222         int *leave = private;
 223         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 224         struct gfs2_rgrpd *rgd;
 225         struct gfs2_holder rg_gh;
 226         struct buffer_head *dibh;
 227         __be64 *dataptrs;
 228         u64 bn = 0;
 229         u64 bstart = 0;
 230         unsigned int blen = 0;
 231         unsigned int blks = 0;
 232         unsigned int x;
 233         int error;
 234
 235         if (GFS2_EA_IS_STUFFED(ea))
 236                 return 0;
 237
 238         dataptrs = GFS2_EA2DATAPTRS(ea);
 239         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 240                 if (*dataptrs) {
 241                         blks++;
 242                         bn = be64_to_cpu(*dataptrs);
 243                 }
 244         }
 245         if (!blks)
 246                 return 0;
 247
 248         rgd = gfs2_blk2rgrpd(sdp, bn);
 249         if (!rgd) {
 250                 gfs2_consist_inode(ip);
 251                 return -EIO;
 252         }
 253
 254         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 255         if (error)
 256                 return error;
 257
 258         error = gfs2_trans_begin(sdp, rgd->rd_ri.ri_length + RES_DINODE +
 259                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 260         if (error)
 261                 goto out_gunlock;
 262
 263         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 264
 265         dataptrs = GFS2_EA2DATAPTRS(ea);
 266         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 267                 if (!*dataptrs)
 268                         break;
 269                 bn = be64_to_cpu(*dataptrs);
 270
 271                 if (bstart + blen == bn)
 272                         blen++;
 273                 else {
 274                         if (bstart)
 275                                 gfs2_free_meta(ip, bstart, blen);
 276                         bstart = bn;
 277                         blen = 1;
 278                 }
 279
 280                 *dataptrs = 0;
 281                 if (!ip->i_di.di_blocks)
 282                         gfs2_consist_inode(ip);
 283                 ip->i_di.di_blocks--;
 284                 gfs2_set_inode_blocks(&ip->i_inode);
 285         }
 286         if (bstart)
 287                 gfs2_free_meta(ip, bstart, blen);
 288
 289         if (prev && !leave) {
 290                 u32 len;
 291
 292                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 293                 prev->ea_rec_len = cpu_to_be32(len);
 294
 295                 if (GFS2_EA_IS_LAST(ea))
 296                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 297         } else {
 298                 ea->ea_type = GFS2_EATYPE_UNUSED;
 299                 ea->ea_num_ptrs = 0;
 300         }
 301
 302         error = gfs2_meta_inode_buffer(ip, &dibh);
 303         if (!error) {
 304                 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
 305                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 306                 gfs2_dinode_out(ip, dibh->b_data);
 307                 brelse(dibh);
 308         }
 309
 310         gfs2_trans_end(sdp);
 311
 312 out_gunlock:
 313         gfs2_glock_dq_uninit(&rg_gh);
 314         return error;
 315 }
 316
 317 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 318                                struct gfs2_ea_header *ea,
 319                                struct gfs2_ea_header *prev, int leave)
 320 {
 321         struct gfs2_alloc *al;
 322         int error;
 323
 324         al = gfs2_alloc_get(ip);
 325
 326         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 327         if (error)
 328                 goto out_alloc;
 329
 330         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 331         if (error)
 332                 goto out_quota;
 333
 334         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 335
 336         gfs2_glock_dq_uninit(&al->al_ri_gh);
 337
 338 out_quota:
 339         gfs2_quota_unhold(ip);
 340 out_alloc:
 341         gfs2_alloc_put(ip);
 342         return error;
 343 }
 344
 345 struct ea_list {
 346         struct gfs2_ea_request *ei_er;
 347         unsigned int ei_size;
 348 };
 349
 350 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 351                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 352                      void *private)
 353 {
 354         struct ea_list *ei = private;
 355         struct gfs2_ea_request *er = ei->ei_er;
 356         unsigned int ea_size = gfs2_ea_strlen(ea);
 357
 358         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 359                 return 0;
 360
 361         if (er->er_data_len) {
 362                 char *prefix = NULL;
 363                 unsigned int l = 0;
 364                 char c = 0;
 365
 366                 if (ei->ei_size + ea_size > er->er_data_len)
 367                         return -ERANGE;
 368
 369                 switch (ea->ea_type) {
 370                 case GFS2_EATYPE_USR:
 371                         prefix = "user.";
 372                         l = 5;
 373                         break;
 374                 case GFS2_EATYPE_SYS:
 375                         prefix = "system.";
 376                         l = 7;
 377                         break;
 378                 case GFS2_EATYPE_SECURITY:
 379                         prefix = "security.";
 380                         l = 9;
 381                         break;
 382                 }
 383
 384                 BUG_ON(l == 0);
 385
 386                 memcpy(er->er_data + ei->ei_size, prefix, l);
 387                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 388                        ea->ea_name_len);
 389                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 390         }
 391
 392         ei->ei_size += ea_size;
 393
 394         return 0;
 395 }
 396
 397 /**
 398  * gfs2_ea_list -
 399  * @ip:
 400  * @er:
 401  *
 402  * Returns: actual size of data on success, -errno on error
 403  */
 404
 405 int gfs2_ea_list(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 406 {
 407         struct gfs2_holder i_gh;
 408         int error;
 409
 410         if (!er->er_data || !er->er_data_len) {
 411                 er->er_data = NULL;
 412                 er->er_data_len = 0;
 413         }
 414
 415         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 416         if (error)
 417                 return error;
 418
 419         if (ip->i_di.di_eattr) {
 420                 struct ea_list ei = { .ei_er = er, .ei_size = 0 };
 421
 422                 error = ea_foreach(ip, ea_list_i, &ei);
 423                 if (!error)
 424                         error = ei.ei_size;
 425         }
 426
 427         gfs2_glock_dq_uninit(&i_gh);
 428
 429         return error;
 430 }
 431
 432 /**
 433  * ea_get_unstuffed - actually copies the unstuffed data into the
 434  *                    request buffer
 435  * @ip: The GFS2 inode
 436  * @ea: The extended attribute header structure
 437  * @data: The data to be copied
 438  *
 439  * Returns: errno
 440  */
 441
 442 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 443                             char *data)
 444 {
 445         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 446         struct buffer_head **bh;
 447         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 448         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 449         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 450         unsigned int x;
 451         int error = 0;
 452
 453         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_KERNEL);
 454         if (!bh)
 455                 return -ENOMEM;
 456
 457         for (x = 0; x < nptrs; x++) {
 458                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 459                                        bh + x);
 460                 if (error) {
 461                         while (x--)
 462                                 brelse(bh[x]);
 463                         goto out;
 464                 }
 465                 dataptrs++;
 466         }
 467
 468         for (x = 0; x < nptrs; x++) {
 469                 error = gfs2_meta_wait(sdp, bh[x]);
 470                 if (error) {
 471                         for (; x < nptrs; x++)
 472                                 brelse(bh[x]);
 473                         goto out;
 474                 }
 475                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 476                         for (; x < nptrs; x++)
 477                                 brelse(bh[x]);
 478                         error = -EIO;
 479                         goto out;
 480                 }
 481
 482                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 483                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 484
 485                 amount -= sdp->sd_jbsize;
 486                 data += sdp->sd_jbsize;
 487
 488                 brelse(bh[x]);
 489         }
 490
 491 out:
 492         kfree(bh);
 493         return error;
 494 }
 495
 496 int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 497                      char *data)
 498 {
 499         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 500                 memcpy(data, GFS2_EA2DATA(el->el_ea), GFS2_EA_DATA_LEN(el->el_ea));
 501                 return 0;
 502         } else
 503                 return ea_get_unstuffed(ip, el->el_ea, data);
 504 }
 505
 506 /**
 507  * gfs2_ea_get_i -
 508  * @ip: The GFS2 inode
 509  * @er: The request structure
 510  *
 511  * Returns: actual size of data on success, -errno on error
 512  */
 513
 514 int gfs2_ea_get_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 515 {
 516         struct gfs2_ea_location el;
 517         int error;
 518
 519         if (!ip->i_di.di_eattr)
 520                 return -ENODATA;
 521
 522         error = gfs2_ea_find(ip, er, &el);
 523         if (error)
 524                 return error;
 525         if (!el.el_ea)
 526                 return -ENODATA;
 527
 528         if (er->er_data_len) {
 529                 if (GFS2_EA_DATA_LEN(el.el_ea) > er->er_data_len)
 530                         error =  -ERANGE;
 531                 else
 532                         error = gfs2_ea_get_copy(ip, &el, er->er_data);
 533         }
 534         if (!error)
 535                 error = GFS2_EA_DATA_LEN(el.el_ea);
 536
 537         brelse(el.el_bh);
 538
 539         return error;
 540 }
 541
 542 /**
 543  * gfs2_ea_get -
 544  * @ip: The GFS2 inode
 545  * @er: The request structure
 546  *
 547  * Returns: actual size of data on success, -errno on error
 548  */
 549
 550 int gfs2_ea_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 551 {
 552         struct gfs2_holder i_gh;
 553         int error;
 554
 555         if (!er->er_name_len ||
 556             er->er_name_len > GFS2_EA_MAX_NAME_LEN)
 557                 return -EINVAL;
 558         if (!er->er_data || !er->er_data_len) {
 559                 er->er_data = NULL;
 560                 er->er_data_len = 0;
 561         }
 562
 563         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 564         if (error)
 565                 return error;
 566
 567         error = gfs2_ea_ops[er->er_type]->eo_get(ip, er);
 568
 569         gfs2_glock_dq_uninit(&i_gh);
 570
 571         return error;
 572 }
 573
 574 /**
 575  * ea_alloc_blk - allocates a new block for extended attributes.
 576  * @ip: A pointer to the inode that's getting extended attributes
 577  * @bhp: Pointer to pointer to a struct buffer_head
 578  *
 579  * Returns: errno
 580  */
 581
 582 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 583 {
 584         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 585         struct gfs2_ea_header *ea;
 586         u64 block;
 587
 588         block = gfs2_alloc_meta(ip);
 589
 590         *bhp = gfs2_meta_new(ip->i_gl, block);
 591         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 592         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 593         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 594
 595         ea = GFS2_EA_BH2FIRST(*bhp);
 596         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 597         ea->ea_type = GFS2_EATYPE_UNUSED;
 598         ea->ea_flags = GFS2_EAFLAG_LAST;
 599         ea->ea_num_ptrs = 0;
 600
 601         ip->i_di.di_blocks++;
 602         gfs2_set_inode_blocks(&ip->i_inode);
 603
 604         return 0;
 605 }
 606
 607 /**
 608  * ea_write - writes the request info to an ea, creating new blocks if
 609  *            necessary
 610  * @ip: inode that is being modified
 611  * @ea: the location of the new ea in a block
 612  * @er: the write request
 613  *
 614  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 615  *
 616  * returns : errno
 617  */
 618
 619 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 620                     struct gfs2_ea_request *er)
 621 {
 622         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 623
 624         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 625         ea->ea_name_len = er->er_name_len;
 626         ea->ea_type = er->er_type;
 627         ea->__pad = 0;
 628
 629         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 630
 631         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 632                 ea->ea_num_ptrs = 0;
 633                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 634         } else {
 635                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 636                 const char *data = er->er_data;
 637                 unsigned int data_len = er->er_data_len;
 638                 unsigned int copy;
 639                 unsigned int x;
 640
 641                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 642                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 643                         struct buffer_head *bh;
 644                         u64 block;
 645                         int mh_size = sizeof(struct gfs2_meta_header);
 646
 647                         block = gfs2_alloc_meta(ip);
 648
 649                         bh = gfs2_meta_new(ip->i_gl, block);
 650                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 651                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 652
 653                         ip->i_di.di_blocks++;
 654                         gfs2_set_inode_blocks(&ip->i_inode);
 655
 656                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 657                                                            data_len;
 658                         memcpy(bh->b_data + mh_size, data, copy);
 659                         if (copy < sdp->sd_jbsize)
 660                                 memset(bh->b_data + mh_size + copy, 0,
 661                                        sdp->sd_jbsize - copy);
 662
 663                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 664                         data += copy;
 665                         data_len -= copy;
 666
 667                         brelse(bh);
 668                 }
 669
 670                 gfs2_assert_withdraw(sdp, !data_len);
 671         }
 672
 673         return 0;
 674 }
 675
 676 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 677                                    struct gfs2_ea_request *er, void *private);
 678
 679 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 680                              unsigned int blks,
 681                              ea_skeleton_call_t skeleton_call, void *private)
 682 {
 683         struct gfs2_alloc *al;
 684         struct buffer_head *dibh;
 685         int error;
 686
 687         al = gfs2_alloc_get(ip);
 688
 689         error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 690         if (error)
 691                 goto out;
 692
 693         error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
 694         if (error)
 695                 goto out_gunlock_q;
 696
 697         al->al_requested = blks;
 698
 699         error = gfs2_inplace_reserve(ip);
 700         if (error)
 701                 goto out_gunlock_q;
 702
 703         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 704                                  blks + al->al_rgd->rd_ri.ri_length +
 705                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 706         if (error)
 707                 goto out_ipres;
 708
 709         error = skeleton_call(ip, er, private);
 710         if (error)
 711                 goto out_end_trans;
 712
 713         error = gfs2_meta_inode_buffer(ip, &dibh);
 714         if (!error) {
 715                 if (er->er_flags & GFS2_ERF_MODE) {
 716                         gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 717                                             (ip->i_inode.i_mode & S_IFMT) ==
 718                                             (er->er_mode & S_IFMT));
 719                         ip->i_inode.i_mode = er->er_mode;
 720                 }
 721                 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
 722                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 723                 gfs2_dinode_out(ip, dibh->b_data);
 724                 brelse(dibh);
 725         }
 726
 727 out_end_trans:
 728         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 729 out_ipres:
 730         gfs2_inplace_release(ip);
 731 out_gunlock_q:
 732         gfs2_quota_unlock(ip);
 733 out:
 734         gfs2_alloc_put(ip);
 735         return error;
 736 }
 737
 738 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 739                      void *private)
 740 {
 741         struct buffer_head *bh;
 742         int error;
 743
 744         error = ea_alloc_blk(ip, &bh);
 745         if (error)
 746                 return error;
 747
 748         ip->i_di.di_eattr = bh->b_blocknr;
 749         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 750
 751         brelse(bh);
 752
 753         return error;
 754 }
 755
 756 /**
 757  * ea_init - initializes a new eattr block
 758  * @ip:
 759  * @er:
 760  *
 761  * Returns: errno
 762  */
 763
 764 static int ea_init(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 765 {
 766         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 767         unsigned int blks = 1;
 768
 769         if (GFS2_EAREQ_SIZE_STUFFED(er) > jbsize)
 770                 blks += DIV_ROUND_UP(er->er_data_len, jbsize);
 771
 772         return ea_alloc_skeleton(ip, er, blks, ea_init_i, NULL);
 773 }
 774
 775 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 776 {
 777         u32 ea_size = GFS2_EA_SIZE(ea);
 778         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 779                                      ea_size);
 780         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 781         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 782
 783         ea->ea_rec_len = cpu_to_be32(ea_size);
 784         ea->ea_flags ^= last;
 785
 786         new->ea_rec_len = cpu_to_be32(new_size);
 787         new->ea_flags = last;
 788
 789         return new;
 790 }
 791
 792 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 793                                   struct gfs2_ea_location *el)
 794 {
 795         struct gfs2_ea_header *ea = el->el_ea;
 796         struct gfs2_ea_header *prev = el->el_prev;
 797         u32 len;
 798
 799         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 800
 801         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 802                 ea->ea_type = GFS2_EATYPE_UNUSED;
 803                 return;
 804         } else if (GFS2_EA2NEXT(prev) != ea) {
 805                 prev = GFS2_EA2NEXT(prev);
 806                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 807         }
 808
 809         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 810         prev->ea_rec_len = cpu_to_be32(len);
 811
 812         if (GFS2_EA_IS_LAST(ea))
 813                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 814 }
 815
 816 struct ea_set {
 817         int ea_split;
 818
 819         struct gfs2_ea_request *es_er;
 820         struct gfs2_ea_location *es_el;
 821
 822         struct buffer_head *es_bh;
 823         struct gfs2_ea_header *es_ea;
 824 };
 825
 826 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 827                                  struct gfs2_ea_header *ea, struct ea_set *es)
 828 {
 829         struct gfs2_ea_request *er = es->es_er;
 830         struct buffer_head *dibh;
 831         int error;
 832
 833         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 834         if (error)
 835                 return error;
 836
 837         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 838
 839         if (es->ea_split)
 840                 ea = ea_split_ea(ea);
 841
 842         ea_write(ip, ea, er);
 843
 844         if (es->es_el)
 845                 ea_set_remove_stuffed(ip, es->es_el);
 846
 847         error = gfs2_meta_inode_buffer(ip, &dibh);
 848         if (error)
 849                 goto out;
 850
 851         if (er->er_flags & GFS2_ERF_MODE) {
 852                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 853                         (ip->i_inode.i_mode & S_IFMT) == (er->er_mode & S_IFMT));
 854                 ip->i_inode.i_mode = er->er_mode;
 855         }
 856         ip->i_inode.i_ctime = CURRENT_TIME_SEC;
 857         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 858         gfs2_dinode_out(ip, dibh->b_data);
 859         brelse(dibh);
 860 out:
 861         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 862         return error;
 863 }
 864
 865 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 866                                struct gfs2_ea_request *er, void *private)
 867 {
 868         struct ea_set *es = private;
 869         struct gfs2_ea_header *ea = es->es_ea;
 870         int error;
 871
 872         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 873
 874         if (es->ea_split)
 875                 ea = ea_split_ea(ea);
 876
 877         error = ea_write(ip, ea, er);
 878         if (error)
 879                 return error;
 880
 881         if (es->es_el)
 882                 ea_set_remove_stuffed(ip, es->es_el);
 883
 884         return 0;
 885 }
 886
 887 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 888                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 889                          void *private)
 890 {
 891         struct ea_set *es = private;
 892         unsigned int size;
 893         int stuffed;
 894         int error;
 895
 896         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er, &size);
 897
 898         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 899                 if (GFS2_EA_REC_LEN(ea) < size)
 900                         return 0;
 901                 if (!GFS2_EA_IS_STUFFED(ea)) {
 902                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 903                         if (error)
 904                                 return error;
 905                 }
 906                 es->ea_split = 0;
 907         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 908                 es->ea_split = 1;
 909         else
 910                 return 0;
 911
 912         if (stuffed) {
 913                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 914                 if (error)
 915                         return error;
 916         } else {
 917                 unsigned int blks;
 918
 919                 es->es_bh = bh;
 920                 es->es_ea = ea;
 921                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 922                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 923
 924                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 925                                           ea_set_simple_alloc, es);
 926                 if (error)
 927                         return error;
 928         }
 929
 930         return 1;
 931 }
 932
 933 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 934                         void *private)
 935 {
 936         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 937         struct buffer_head *indbh, *newbh;
 938         __be64 *eablk;
 939         int error;
 940         int mh_size = sizeof(struct gfs2_meta_header);
 941
 942         if (ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT) {
 943                 __be64 *end;
 944
 945                 error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT,
 946                                        &indbh);
 947                 if (error)
 948                         return error;
 949
 950                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 951                         error = -EIO;
 952                         goto out;
 953                 }
 954
 955                 eablk = (__be64 *)(indbh->b_data + mh_size);
 956                 end = eablk + sdp->sd_inptrs;
 957
 958                 for (; eablk < end; eablk++)
 959                         if (!*eablk)
 960                                 break;
 961
 962                 if (eablk == end) {
 963                         error = -ENOSPC;
 964                         goto out;
 965                 }
 966
 967                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 968         } else {
 969                 u64 blk;
 970
 971                 blk = gfs2_alloc_meta(ip);
 972
 973                 indbh = gfs2_meta_new(ip->i_gl, blk);
 974                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 975                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
 976                 gfs2_buffer_clear_tail(indbh, mh_size);
 977
 978                 eablk = (__be64 *)(indbh->b_data + mh_size);
 979                 *eablk = cpu_to_be64(ip->i_di.di_eattr);
 980                 ip->i_di.di_eattr = blk;
 981                 ip->i_di.di_flags |= GFS2_DIF_EA_INDIRECT;
 982                 ip->i_di.di_blocks++;
 983                 gfs2_set_inode_blocks(&ip->i_inode);
 984
 985                 eablk++;
 986         }
 987
 988         error = ea_alloc_blk(ip, &newbh);
 989         if (error)
 990                 goto out;
 991
 992         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
 993         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
 994         brelse(newbh);
 995         if (error)
 996                 goto out;
 997
 998         if (private)
 999                 ea_set_remove_stuffed(ip, private);
1000
1001 out:
1002         brelse(indbh);
1003         return error;
1004 }
1005
1006 static int ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
1007                     struct gfs2_ea_location *el)
1008 {
1009         struct ea_set es;
1010         unsigned int blks = 2;
1011         int error;
1012
1013         memset(&es, 0, sizeof(struct ea_set));
1014         es.es_er = er;
1015         es.es_el = el;
1016
1017         error = ea_foreach(ip, ea_set_simple, &es);
1018         if (error > 0)
1019                 return 0;
1020         if (error)
1021                 return error;
1022
1023         if (!(ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT))
1024                 blks++;
1025         if (GFS2_EAREQ_SIZE_STUFFED(er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1026                 blks += DIV_ROUND_UP(er->er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1027
1028         return ea_alloc_skeleton(ip, er, blks, ea_set_block, el);
1029 }
1030
1031 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1032                                    struct gfs2_ea_location *el)
1033 {
1034         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1035                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1036                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1037                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1038         }
1039
1040         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev,0);
1041 }
1042
1043 int gfs2_ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1044 {
1045         struct gfs2_ea_location el;
1046         int error;
1047
1048         if (!ip->i_di.di_eattr) {
1049                 if (er->er_flags & XATTR_REPLACE)
1050                         return -ENODATA;
1051                 return ea_init(ip, er);
1052         }
1053
1054         error = gfs2_ea_find(ip, er, &el);
1055         if (error)
1056                 return error;
1057
1058         if (el.el_ea) {
1059                 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) {
1060                         brelse(el.el_bh);
1061                         return -EPERM;
1062                 }
1063
1064                 error = -EEXIST;
1065                 if (!(er->er_flags & XATTR_CREATE)) {
1066                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1067                         error = ea_set_i(ip, er, &el);
1068                         if (!error && unstuffed)
1069                                 ea_set_remove_unstuffed(ip, &el);
1070                 }
1071
1072                 brelse(el.el_bh);
1073         } else {
1074                 error = -ENODATA;
1075                 if (!(er->er_flags & XATTR_REPLACE))
1076                         error = ea_set_i(ip, er, NULL);
1077         }
1078
1079         return error;
1080 }
1081
1082 int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1083 {
1084         struct gfs2_holder i_gh;
1085         int error;
1086
1087         if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1088                 return -EINVAL;
1089         if (!er->er_data || !er->er_data_len) {
1090                 er->er_data = NULL;
1091                 er->er_data_len = 0;
1092         }
1093         error = ea_check_size(GFS2_SB(&ip->i_inode), er);
1094         if (error)
1095                 return error;
1096
1097         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1098         if (error)
1099                 return error;
1100
1101         if (IS_IMMUTABLE(&ip->i_inode))
1102                 error = -EPERM;
1103         else
1104                 error = gfs2_ea_ops[er->er_type]->eo_set(ip, er);
1105
1106         gfs2_glock_dq_uninit(&i_gh);
1107
1108         return error;
1109 }
1110
1111 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1112 {
1113         struct gfs2_ea_header *ea = el->el_ea;
1114         struct gfs2_ea_header *prev = el->el_prev;
1115         struct buffer_head *dibh;
1116         int error;
1117
1118         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1119         if (error)
1120                 return error;
1121
1122         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1123
1124         if (prev) {
1125                 u32 len;
1126
1127                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1128                 prev->ea_rec_len = cpu_to_be32(len);
1129
1130                 if (GFS2_EA_IS_LAST(ea))
1131                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1132         } else
1133                 ea->ea_type = GFS2_EATYPE_UNUSED;
1134
1135         error = gfs2_meta_inode_buffer(ip, &dibh);
1136         if (!error) {
1137                 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
1138                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1139                 gfs2_dinode_out(ip, dibh->b_data);
1140                 brelse(dibh);
1141         }
1142
1143         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1144
1145         return error;
1146 }
1147
1148 int gfs2_ea_remove_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1149 {
1150         struct gfs2_ea_location el;
1151         int error;
1152
1153         if (!ip->i_di.di_eattr)
1154                 return -ENODATA;
1155
1156         error = gfs2_ea_find(ip, er, &el);
1157         if (error)
1158                 return error;
1159         if (!el.el_ea)
1160                 return -ENODATA;
1161
1162         if (GFS2_EA_IS_STUFFED(el.el_ea))
1163                 error = ea_remove_stuffed(ip, &el);
1164         else
1165                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev,
1166                                             0);
1167
1168         brelse(el.el_bh);
1169
1170         return error;
1171 }
1172
1173 /**
1174  * gfs2_ea_remove - sets (or creates or replaces) an extended attribute
1175  * @ip: pointer to the inode of the target file
1176  * @er: request information
1177  *
1178  * Returns: errno
1179  */
1180
1181 int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1182 {
1183         struct gfs2_holder i_gh;
1184         int error;
1185
1186         if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1187                 return -EINVAL;
1188
1189         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1190         if (error)
1191                 return error;
1192
1193         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1194                 error = -EPERM;
1195         else
1196                 error = gfs2_ea_ops[er->er_type]->eo_remove(ip, er);
1197
1198         gfs2_glock_dq_uninit(&i_gh);
1199
1200         return error;
1201 }
1202
1203 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1204                                   struct gfs2_ea_header *ea, char *data)
1205 {
1206         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1207         struct buffer_head **bh;
1208         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1209         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1210         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1211         unsigned int x;
1212         int error;
1213
1214         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_KERNEL);
1215         if (!bh)
1216                 return -ENOMEM;
1217
1218         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1219         if (error)
1220                 goto out;
1221
1222         for (x = 0; x < nptrs; x++) {
1223                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1224                                        bh + x);
1225                 if (error) {
1226                         while (x--)
1227                                 brelse(bh[x]);
1228                         goto fail;
1229                 }
1230                 dataptrs++;
1231         }
1232
1233         for (x = 0; x < nptrs; x++) {
1234                 error = gfs2_meta_wait(sdp, bh[x]);
1235                 if (error) {
1236                         for (; x < nptrs; x++)
1237                                 brelse(bh[x]);
1238                         goto fail;
1239                 }
1240                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1241                         for (; x < nptrs; x++)
1242                                 brelse(bh[x]);
1243                         error = -EIO;
1244                         goto fail;
1245                 }
1246
1247                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1248
1249                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1250                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1251
1252                 amount -= sdp->sd_jbsize;
1253                 data += sdp->sd_jbsize;
1254
1255                 brelse(bh[x]);
1256         }
1257
1258 out:
1259         kfree(bh);
1260         return error;
1261
1262 fail:
1263         gfs2_trans_end(sdp);
1264         kfree(bh);
1265         return error;
1266 }
1267
1268 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
1269                       struct iattr *attr, char *data)
1270 {
1271         struct buffer_head *dibh;
1272         int error;
1273
1274         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
1275                 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1276                 if (error)
1277                         return error;
1278
1279                 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1280                 memcpy(GFS2_EA2DATA(el->el_ea), data,
1281                        GFS2_EA_DATA_LEN(el->el_ea));
1282         } else
1283                 error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);
1284
1285         if (error)
1286                 return error;
1287
1288         error = gfs2_meta_inode_buffer(ip, &dibh);
1289         if (!error) {
1290                 error = inode_setattr(&ip->i_inode, attr);
1291                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1292                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1293                 gfs2_dinode_out(ip, dibh->b_data);
1294                 brelse(dibh);
1295         }
1296
1297         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1298
1299         return error;
1300 }
1301
1302 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1303 {
1304         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1305         struct gfs2_rgrp_list rlist;
1306         struct buffer_head *indbh, *dibh;
1307         __be64 *eablk, *end;
1308         unsigned int rg_blocks = 0;
1309         u64 bstart = 0;
1310         unsigned int blen = 0;
1311         unsigned int blks = 0;
1312         unsigned int x;
1313         int error;
1314
1315         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1316
1317         error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT, &indbh);
1318         if (error)
1319                 return error;
1320
1321         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1322                 error = -EIO;
1323                 goto out;
1324         }
1325
1326         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1327         end = eablk + sdp->sd_inptrs;
1328
1329         for (; eablk < end; eablk++) {
1330                 u64 bn;
1331
1332                 if (!*eablk)
1333                         break;
1334                 bn = be64_to_cpu(*eablk);
1335
1336                 if (bstart + blen == bn)
1337                         blen++;
1338                 else {
1339                         if (bstart)
1340                                 gfs2_rlist_add(sdp, &rlist, bstart);
1341                         bstart = bn;
1342                         blen = 1;
1343                 }
1344                 blks++;
1345         }
1346         if (bstart)
1347                 gfs2_rlist_add(sdp, &rlist, bstart);
1348         else
1349                 goto out;
1350
1351         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
1352
1353         for (x = 0; x < rlist.rl_rgrps; x++) {
1354                 struct gfs2_rgrpd *rgd;
1355                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1356                 rg_blocks += rgd->rd_ri.ri_length;
1357         }
1358
1359         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1360         if (error)
1361                 goto out_rlist_free;
1362
1363         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1364                                  RES_STATFS + RES_QUOTA, blks);
1365         if (error)
1366                 goto out_gunlock;
1367
1368         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1369
1370         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1371         bstart = 0;
1372         blen = 0;
1373
1374         for (; eablk < end; eablk++) {
1375                 u64 bn;
1376
1377                 if (!*eablk)
1378                         break;
1379                 bn = be64_to_cpu(*eablk);
1380
1381                 if (bstart + blen == bn)
1382                         blen++;
1383                 else {
1384                         if (bstart)
1385                                 gfs2_free_meta(ip, bstart, blen);
1386                         bstart = bn;
1387                         blen = 1;
1388                 }
1389
1390                 *eablk = 0;
1391                 if (!ip->i_di.di_blocks)
1392                         gfs2_consist_inode(ip);
1393                 ip->i_di.di_blocks--;
1394                 gfs2_set_inode_blocks(&ip->i_inode);
1395         }
1396         if (bstart)
1397                 gfs2_free_meta(ip, bstart, blen);
1398
1399         ip->i_di.di_flags &= ~GFS2_DIF_EA_INDIRECT;
1400
1401         error = gfs2_meta_inode_buffer(ip, &dibh);
1402         if (!error) {
1403                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1404                 gfs2_dinode_out(ip, dibh->b_data);
1405                 brelse(dibh);
1406         }
1407
1408         gfs2_trans_end(sdp);
1409
1410 out_gunlock:
1411         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1412 out_rlist_free:
1413         gfs2_rlist_free(&rlist);
1414 out:
1415         brelse(indbh);
1416         return error;
1417 }
1418
1419 static int ea_dealloc_block(struct gfs2_inode *ip)
1420 {
1421         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1422         struct gfs2_alloc *al = &ip->i_alloc;
1423         struct gfs2_rgrpd *rgd;
1424         struct buffer_head *dibh;
1425         int error;
1426
1427         rgd = gfs2_blk2rgrpd(sdp, ip->i_di.di_eattr);
1428         if (!rgd) {
1429                 gfs2_consist_inode(ip);
1430                 return -EIO;
1431         }
1432
1433         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1434                                    &al->al_rgd_gh);
1435         if (error)
1436                 return error;
1437
1438         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1439                                  RES_QUOTA, 1);
1440         if (error)
1441                 goto out_gunlock;
1442
1443         gfs2_free_meta(ip, ip->i_di.di_eattr, 1);
1444
1445         ip->i_di.di_eattr = 0;
1446         if (!ip->i_di.di_blocks)
1447                 gfs2_consist_inode(ip);
1448         ip->i_di.di_blocks--;
1449         gfs2_set_inode_blocks(&ip->i_inode);
1450
1451         error = gfs2_meta_inode_buffer(ip, &dibh);
1452         if (!error) {
1453                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1454                 gfs2_dinode_out(ip, dibh->b_data);
1455                 brelse(dibh);
1456         }
1457
1458         gfs2_trans_end(sdp);
1459
1460 out_gunlock:
1461         gfs2_glock_dq_uninit(&al->al_rgd_gh);
1462         return error;
1463 }
1464
1465 /**
1466  * gfs2_ea_dealloc - deallocate the extended attribute fork
1467  * @ip: the inode
1468  *
1469  * Returns: errno
1470  */
1471
1472 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1473 {
1474         struct gfs2_alloc *al;
1475         int error;
1476
1477         al = gfs2_alloc_get(ip);
1478
1479         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1480         if (error)
1481                 goto out_alloc;
1482
1483         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1484         if (error)
1485                 goto out_quota;
1486
1487         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1488         if (error)
1489                 goto out_rindex;
1490
1491         if (ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT) {
1492                 error = ea_dealloc_indirect(ip);
1493                 if (error)
1494                         goto out_rindex;
1495         }
1496
1497         error = ea_dealloc_block(ip);
1498
1499 out_rindex:
1500         gfs2_glock_dq_uninit(&al->al_ri_gh);
1501 out_quota:
1502         gfs2_quota_unhold(ip);
1503 out_alloc:
1504         gfs2_alloc_put(ip);
1505         return error;
1506 }
1507