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/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/lm_interface.h>
  17 #include <asm/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "acl.h"
  22 #include "eaops.h"
  23 #include "eattr.h"
  24 #include "glock.h"
  25 #include "inode.h"
  26 #include "meta_io.h"
  27 #include "quota.h"
  28 #include "rgrp.h"
  29 #include "trans.h"
  30 #include "util.h"
  31
  32 /**
  33  * ea_calc_size - returns the acutal number of bytes the request will take up
  34  *                (not counting any unstuffed data blocks)
  35  * @sdp:
  36  * @er:
  37  * @size:
  38  *
  39  * Returns: 1 if the EA should be stuffed
  40  */
  41
  42 static int ea_calc_size(struct gfs2_sbd *sdp, struct gfs2_ea_request *er,
  43                         unsigned int *size)
  44 {
  45         *size = GFS2_EAREQ_SIZE_STUFFED(er);
  46         if (*size <= sdp->sd_jbsize)
  47                 return 1;
  48
  49         *size = GFS2_EAREQ_SIZE_UNSTUFFED(sdp, er);
  50
  51         return 0;
  52 }
  53
  54 static int ea_check_size(struct gfs2_sbd *sdp, struct gfs2_ea_request *er)
  55 {
  56         unsigned int size;
  57
  58         if (er->er_data_len > GFS2_EA_MAX_DATA_LEN)
  59                 return -ERANGE;
  60
  61         ea_calc_size(sdp, er, &size);
  62
  63         /* This can only happen with 512 byte blocks */
  64         if (size > sdp->sd_jbsize)
  65                 return -ERANGE;
  66
  67         return 0;
  68 }
  69
  70 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  71                           struct gfs2_ea_header *ea,
  72                           struct gfs2_ea_header *prev, void *private);
  73
  74 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  75                         ea_call_t ea_call, void *data)
  76 {
  77         struct gfs2_ea_header *ea, *prev = NULL;
  78         int error = 0;
  79
  80         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  81                 return -EIO;
  82
  83         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  84                 if (!GFS2_EA_REC_LEN(ea))
  85                         goto fail;
  86                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  87                                                   bh->b_data + bh->b_size))
  88                         goto fail;
  89                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  90                         goto fail;
  91
  92                 error = ea_call(ip, bh, ea, prev, data);
  93                 if (error)
  94                         return error;
  95
  96                 if (GFS2_EA_IS_LAST(ea)) {
  97                         if ((char *)GFS2_EA2NEXT(ea) !=
  98                             bh->b_data + bh->b_size)
  99                                 goto fail;
 100                         break;
 101                 }
 102         }
 103
 104         return error;
 105
 106 fail:
 107         gfs2_consist_inode(ip);
 108         return -EIO;
 109 }
 110
 111 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 112 {
 113         struct buffer_head *bh, *eabh;
 114         __be64 *eablk, *end;
 115         int error;
 116
 117         error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT, &bh);
 118         if (error)
 119                 return error;
 120
 121         if (!(ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT)) {
 122                 error = ea_foreach_i(ip, bh, ea_call, data);
 123                 goto out;
 124         }
 125
 126         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 127                 error = -EIO;
 128                 goto out;
 129         }
 130
 131         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 132         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 133
 134         for (; eablk < end; eablk++) {
 135                 u64 bn;
 136
 137                 if (!*eablk)
 138                         break;
 139                 bn = be64_to_cpu(*eablk);
 140
 141                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 142                 if (error)
 143                         break;
 144                 error = ea_foreach_i(ip, eabh, ea_call, data);
 145                 brelse(eabh);
 146                 if (error)
 147                         break;
 148         }
 149 out:
 150         brelse(bh);
 151         return error;
 152 }
 153
 154 struct ea_find {
 155         struct gfs2_ea_request *ef_er;
 156         struct gfs2_ea_location *ef_el;
 157 };
 158
 159 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 160                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 161                      void *private)
 162 {
 163         struct ea_find *ef = private;
 164         struct gfs2_ea_request *er = ef->ef_er;
 165
 166         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 167                 return 0;
 168
 169         if (ea->ea_type == er->er_type) {
 170                 if (ea->ea_name_len == er->er_name_len &&
 171                     !memcmp(GFS2_EA2NAME(ea), er->er_name, ea->ea_name_len)) {
 172                         struct gfs2_ea_location *el = ef->ef_el;
 173                         get_bh(bh);
 174                         el->el_bh = bh;
 175                         el->el_ea = ea;
 176                         el->el_prev = prev;
 177                         return 1;
 178                 }
 179         }
 180
 181         return 0;
 182 }
 183
 184 int gfs2_ea_find(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 185                  struct gfs2_ea_location *el)
 186 {
 187         struct ea_find ef;
 188         int error;
 189
 190         ef.ef_er = er;
 191         ef.ef_el = el;
 192
 193         memset(el, 0, sizeof(struct gfs2_ea_location));
 194
 195         error = ea_foreach(ip, ea_find_i, &ef);
 196         if (error > 0)
 197                 return 0;
 198
 199         return error;
 200 }
 201
 202 /**
 203  * ea_dealloc_unstuffed -
 204  * @ip:
 205  * @bh:
 206  * @ea:
 207  * @prev:
 208  * @private:
 209  *
 210  * Take advantage of the fact that all unstuffed blocks are
 211  * allocated from the same RG.  But watch, this may not always
 212  * be true.
 213  *
 214  * Returns: errno
 215  */
 216
 217 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 218                                 struct gfs2_ea_header *ea,
 219                                 struct gfs2_ea_header *prev, void *private)
 220 {
 221         int *leave = private;
 222         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 223         struct gfs2_rgrpd *rgd;
 224         struct gfs2_holder rg_gh;
 225         struct buffer_head *dibh;
 226         __be64 *dataptrs;
 227         u64 bn = 0;
 228         u64 bstart = 0;
 229         unsigned int blen = 0;
 230         unsigned int blks = 0;
 231         unsigned int x;
 232         int error;
 233
 234         if (GFS2_EA_IS_STUFFED(ea))
 235                 return 0;
 236
 237         dataptrs = GFS2_EA2DATAPTRS(ea);
 238         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 239                 if (*dataptrs) {
 240                         blks++;
 241                         bn = be64_to_cpu(*dataptrs);
 242                 }
 243         }
 244         if (!blks)
 245                 return 0;
 246
 247         rgd = gfs2_blk2rgrpd(sdp, bn);
 248         if (!rgd) {
 249                 gfs2_consist_inode(ip);
 250                 return -EIO;
 251         }
 252
 253         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 254         if (error)
 255                 return error;
 256
 257         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 258                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 259         if (error)
 260                 goto out_gunlock;
 261
 262         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 263
 264         dataptrs = GFS2_EA2DATAPTRS(ea);
 265         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 266                 if (!*dataptrs)
 267                         break;
 268                 bn = be64_to_cpu(*dataptrs);
 269
 270                 if (bstart + blen == bn)
 271                         blen++;
 272                 else {
 273                         if (bstart)
 274                                 gfs2_free_meta(ip, bstart, blen);
 275                         bstart = bn;
 276                         blen = 1;
 277                 }
 278
 279                 *dataptrs = 0;
 280                 if (!ip->i_di.di_blocks)
 281                         gfs2_consist_inode(ip);
 282                 ip->i_di.di_blocks--;
 283                 gfs2_set_inode_blocks(&ip->i_inode);
 284         }
 285         if (bstart)
 286                 gfs2_free_meta(ip, bstart, blen);
 287
 288         if (prev && !leave) {
 289                 u32 len;
 290
 291                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 292                 prev->ea_rec_len = cpu_to_be32(len);
 293
 294                 if (GFS2_EA_IS_LAST(ea))
 295                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 296         } else {
 297                 ea->ea_type = GFS2_EATYPE_UNUSED;
 298                 ea->ea_num_ptrs = 0;
 299         }
 300
 301         error = gfs2_meta_inode_buffer(ip, &dibh);
 302         if (!error) {
 303                 ip->i_inode.i_ctime = CURRENT_TIME;
 304                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 305                 gfs2_dinode_out(ip, dibh->b_data);
 306                 brelse(dibh);
 307         }
 308
 309         gfs2_trans_end(sdp);
 310
 311 out_gunlock:
 312         gfs2_glock_dq_uninit(&rg_gh);
 313         return error;
 314 }
 315
 316 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 317                                struct gfs2_ea_header *ea,
 318                                struct gfs2_ea_header *prev, int leave)
 319 {
 320         struct gfs2_alloc *al;
 321         int error;
 322
 323         al = gfs2_alloc_get(ip);
 324
 325         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 326         if (error)
 327                 goto out_alloc;
 328
 329         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 330         if (error)
 331                 goto out_quota;
 332
 333         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 334
 335         gfs2_glock_dq_uninit(&al->al_ri_gh);
 336
 337 out_quota:
 338         gfs2_quota_unhold(ip);
 339 out_alloc:
 340         gfs2_alloc_put(ip);
 341         return error;
 342 }
 343
 344 struct ea_list {
 345         struct gfs2_ea_request *ei_er;
 346         unsigned int ei_size;
 347 };
 348
 349 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 350                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 351                      void *private)
 352 {
 353         struct ea_list *ei = private;
 354         struct gfs2_ea_request *er = ei->ei_er;
 355         unsigned int ea_size = gfs2_ea_strlen(ea);
 356
 357         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 358                 return 0;
 359
 360         if (er->er_data_len) {
 361                 char *prefix = NULL;
 362                 unsigned int l = 0;
 363                 char c = 0;
 364
 365                 if (ei->ei_size + ea_size > er->er_data_len)
 366                         return -ERANGE;
 367
 368                 switch (ea->ea_type) {
 369                 case GFS2_EATYPE_USR:
 370                         prefix = "user.";
 371                         l = 5;
 372                         break;
 373                 case GFS2_EATYPE_SYS:
 374                         prefix = "system.";
 375                         l = 7;
 376                         break;
 377                 case GFS2_EATYPE_SECURITY:
 378                         prefix = "security.";
 379                         l = 9;
 380                         break;
 381                 }
 382
 383                 BUG_ON(l == 0);
 384
 385                 memcpy(er->er_data + ei->ei_size, prefix, l);
 386                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 387                        ea->ea_name_len);
 388                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 389         }
 390
 391         ei->ei_size += ea_size;
 392
 393         return 0;
 394 }
 395
 396 /**
 397  * gfs2_ea_list -
 398  * @ip:
 399  * @er:
 400  *
 401  * Returns: actual size of data on success, -errno on error
 402  */
 403
 404 int gfs2_ea_list(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 405 {
 406         struct gfs2_holder i_gh;
 407         int error;
 408
 409         if (!er->er_data || !er->er_data_len) {
 410                 er->er_data = NULL;
 411                 er->er_data_len = 0;
 412         }
 413
 414         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 415         if (error)
 416                 return error;
 417
 418         if (ip->i_di.di_eattr) {
 419                 struct ea_list ei = { .ei_er = er, .ei_size = 0 };
 420
 421                 error = ea_foreach(ip, ea_list_i, &ei);
 422                 if (!error)
 423                         error = ei.ei_size;
 424         }
 425
 426         gfs2_glock_dq_uninit(&i_gh);
 427
 428         return error;
 429 }
 430
 431 /**
 432  * ea_get_unstuffed - actually copies the unstuffed data into the
 433  *                    request buffer
 434  * @ip: The GFS2 inode
 435  * @ea: The extended attribute header structure
 436  * @data: The data to be copied
 437  *
 438  * Returns: errno
 439  */
 440
 441 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 442                             char *data)
 443 {
 444         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 445         struct buffer_head **bh;
 446         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 447         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 448         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 449         unsigned int x;
 450         int error = 0;
 451
 452         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_KERNEL);
 453         if (!bh)
 454                 return -ENOMEM;
 455
 456         for (x = 0; x < nptrs; x++) {
 457                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 458                                        bh + x);
 459                 if (error) {
 460                         while (x--)
 461                                 brelse(bh[x]);
 462                         goto out;
 463                 }
 464                 dataptrs++;
 465         }
 466
 467         for (x = 0; x < nptrs; x++) {
 468                 error = gfs2_meta_wait(sdp, bh[x]);
 469                 if (error) {
 470                         for (; x < nptrs; x++)
 471                                 brelse(bh[x]);
 472                         goto out;
 473                 }
 474                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 475                         for (; x < nptrs; x++)
 476                                 brelse(bh[x]);
 477                         error = -EIO;
 478                         goto out;
 479                 }
 480
 481                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 482                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 483
 484                 amount -= sdp->sd_jbsize;
 485                 data += sdp->sd_jbsize;
 486
 487                 brelse(bh[x]);
 488         }
 489
 490 out:
 491         kfree(bh);
 492         return error;
 493 }
 494
 495 int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 496                      char *data)
 497 {
 498         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 499                 memcpy(data, GFS2_EA2DATA(el->el_ea), GFS2_EA_DATA_LEN(el->el_ea));
 500                 return 0;
 501         } else
 502                 return ea_get_unstuffed(ip, el->el_ea, data);
 503 }
 504
 505 /**
 506  * gfs2_ea_get_i -
 507  * @ip: The GFS2 inode
 508  * @er: The request structure
 509  *
 510  * Returns: actual size of data on success, -errno on error
 511  */
 512
 513 int gfs2_ea_get_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 514 {
 515         struct gfs2_ea_location el;
 516         int error;
 517
 518         if (!ip->i_di.di_eattr)
 519                 return -ENODATA;
 520
 521         error = gfs2_ea_find(ip, er, &el);
 522         if (error)
 523                 return error;
 524         if (!el.el_ea)
 525                 return -ENODATA;
 526
 527         if (er->er_data_len) {
 528                 if (GFS2_EA_DATA_LEN(el.el_ea) > er->er_data_len)
 529                         error =  -ERANGE;
 530                 else
 531                         error = gfs2_ea_get_copy(ip, &el, er->er_data);
 532         }
 533         if (!error)
 534                 error = GFS2_EA_DATA_LEN(el.el_ea);
 535
 536         brelse(el.el_bh);
 537
 538         return error;
 539 }
 540
 541 /**
 542  * gfs2_ea_get -
 543  * @ip: The GFS2 inode
 544  * @er: The request structure
 545  *
 546  * Returns: actual size of data on success, -errno on error
 547  */
 548
 549 int gfs2_ea_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 550 {
 551         struct gfs2_holder i_gh;
 552         int error;
 553
 554         if (!er->er_name_len ||
 555             er->er_name_len > GFS2_EA_MAX_NAME_LEN)
 556                 return -EINVAL;
 557         if (!er->er_data || !er->er_data_len) {
 558                 er->er_data = NULL;
 559                 er->er_data_len = 0;
 560         }
 561
 562         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 563         if (error)
 564                 return error;
 565
 566         error = gfs2_ea_ops[er->er_type]->eo_get(ip, er);
 567
 568         gfs2_glock_dq_uninit(&i_gh);
 569
 570         return error;
 571 }
 572
 573 /**
 574  * ea_alloc_blk - allocates a new block for extended attributes.
 575  * @ip: A pointer to the inode that's getting extended attributes
 576  * @bhp: Pointer to pointer to a struct buffer_head
 577  *
 578  * Returns: errno
 579  */
 580
 581 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 582 {
 583         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 584         struct gfs2_ea_header *ea;
 585         u64 block;
 586
 587         block = gfs2_alloc_meta(ip);
 588
 589         *bhp = gfs2_meta_new(ip->i_gl, block);
 590         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 591         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 592         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 593
 594         ea = GFS2_EA_BH2FIRST(*bhp);
 595         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 596         ea->ea_type = GFS2_EATYPE_UNUSED;
 597         ea->ea_flags = GFS2_EAFLAG_LAST;
 598         ea->ea_num_ptrs = 0;
 599
 600         ip->i_di.di_blocks++;
 601         gfs2_set_inode_blocks(&ip->i_inode);
 602
 603         return 0;
 604 }
 605
 606 /**
 607  * ea_write - writes the request info to an ea, creating new blocks if
 608  *            necessary
 609  * @ip: inode that is being modified
 610  * @ea: the location of the new ea in a block
 611  * @er: the write request
 612  *
 613  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 614  *
 615  * returns : errno
 616  */
 617
 618 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 619                     struct gfs2_ea_request *er)
 620 {
 621         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 622
 623         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 624         ea->ea_name_len = er->er_name_len;
 625         ea->ea_type = er->er_type;
 626         ea->__pad = 0;
 627
 628         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 629
 630         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 631                 ea->ea_num_ptrs = 0;
 632                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 633         } else {
 634                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 635                 const char *data = er->er_data;
 636                 unsigned int data_len = er->er_data_len;
 637                 unsigned int copy;
 638                 unsigned int x;
 639
 640                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 641                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 642                         struct buffer_head *bh;
 643                         u64 block;
 644                         int mh_size = sizeof(struct gfs2_meta_header);
 645
 646                         block = gfs2_alloc_meta(ip);
 647
 648                         bh = gfs2_meta_new(ip->i_gl, block);
 649                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 650                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 651
 652                         ip->i_di.di_blocks++;
 653                         gfs2_set_inode_blocks(&ip->i_inode);
 654
 655                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 656                                                            data_len;
 657                         memcpy(bh->b_data + mh_size, data, copy);
 658                         if (copy < sdp->sd_jbsize)
 659                                 memset(bh->b_data + mh_size + copy, 0,
 660                                        sdp->sd_jbsize - copy);
 661
 662                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 663                         data += copy;
 664                         data_len -= copy;
 665
 666                         brelse(bh);
 667                 }
 668
 669                 gfs2_assert_withdraw(sdp, !data_len);
 670         }
 671
 672         return 0;
 673 }
 674
 675 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 676                                    struct gfs2_ea_request *er, void *private);
 677
 678 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 679                              unsigned int blks,
 680                              ea_skeleton_call_t skeleton_call, void *private)
 681 {
 682         struct gfs2_alloc *al;
 683         struct buffer_head *dibh;
 684         int error;
 685
 686         al = gfs2_alloc_get(ip);
 687
 688         error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 689         if (error)
 690                 goto out;
 691
 692         error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
 693         if (error)
 694                 goto out_gunlock_q;
 695
 696         al->al_requested = blks;
 697
 698         error = gfs2_inplace_reserve(ip);
 699         if (error)
 700                 goto out_gunlock_q;
 701
 702         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 703                                  blks + al->al_rgd->rd_length +
 704                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 705         if (error)
 706                 goto out_ipres;
 707
 708         error = skeleton_call(ip, er, private);
 709         if (error)
 710                 goto out_end_trans;
 711
 712         error = gfs2_meta_inode_buffer(ip, &dibh);
 713         if (!error) {
 714                 if (er->er_flags & GFS2_ERF_MODE) {
 715                         gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 716                                             (ip->i_inode.i_mode & S_IFMT) ==
 717                                             (er->er_mode & S_IFMT));
 718                         ip->i_inode.i_mode = er->er_mode;
 719                 }
 720                 ip->i_inode.i_ctime = CURRENT_TIME;
 721                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 722                 gfs2_dinode_out(ip, dibh->b_data);
 723                 brelse(dibh);
 724         }
 725
 726 out_end_trans:
 727         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 728 out_ipres:
 729         gfs2_inplace_release(ip);
 730 out_gunlock_q:
 731         gfs2_quota_unlock(ip);
 732 out:
 733         gfs2_alloc_put(ip);
 734         return error;
 735 }
 736
 737 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 738                      void *private)
 739 {
 740         struct buffer_head *bh;
 741         int error;
 742
 743         error = ea_alloc_blk(ip, &bh);
 744         if (error)
 745                 return error;
 746
 747         ip->i_di.di_eattr = bh->b_blocknr;
 748         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 749
 750         brelse(bh);
 751
 752         return error;
 753 }
 754
 755 /**
 756  * ea_init - initializes a new eattr block
 757  * @ip:
 758  * @er:
 759  *
 760  * Returns: errno
 761  */
 762
 763 static int ea_init(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 764 {
 765         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 766         unsigned int blks = 1;
 767
 768         if (GFS2_EAREQ_SIZE_STUFFED(er) > jbsize)
 769                 blks += DIV_ROUND_UP(er->er_data_len, jbsize);
 770
 771         return ea_alloc_skeleton(ip, er, blks, ea_init_i, NULL);
 772 }
 773
 774 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 775 {
 776         u32 ea_size = GFS2_EA_SIZE(ea);
 777         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 778                                      ea_size);
 779         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 780         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 781
 782         ea->ea_rec_len = cpu_to_be32(ea_size);
 783         ea->ea_flags ^= last;
 784
 785         new->ea_rec_len = cpu_to_be32(new_size);
 786         new->ea_flags = last;
 787
 788         return new;
 789 }
 790
 791 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 792                                   struct gfs2_ea_location *el)
 793 {
 794         struct gfs2_ea_header *ea = el->el_ea;
 795         struct gfs2_ea_header *prev = el->el_prev;
 796         u32 len;
 797
 798         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 799
 800         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 801                 ea->ea_type = GFS2_EATYPE_UNUSED;
 802                 return;
 803         } else if (GFS2_EA2NEXT(prev) != ea) {
 804                 prev = GFS2_EA2NEXT(prev);
 805                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 806         }
 807
 808         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 809         prev->ea_rec_len = cpu_to_be32(len);
 810
 811         if (GFS2_EA_IS_LAST(ea))
 812                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 813 }
 814
 815 struct ea_set {
 816         int ea_split;
 817
 818         struct gfs2_ea_request *es_er;
 819         struct gfs2_ea_location *es_el;
 820
 821         struct buffer_head *es_bh;
 822         struct gfs2_ea_header *es_ea;
 823 };
 824
 825 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 826                                  struct gfs2_ea_header *ea, struct ea_set *es)
 827 {
 828         struct gfs2_ea_request *er = es->es_er;
 829         struct buffer_head *dibh;
 830         int error;
 831
 832         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 833         if (error)
 834                 return error;
 835
 836         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 837
 838         if (es->ea_split)
 839                 ea = ea_split_ea(ea);
 840
 841         ea_write(ip, ea, er);
 842
 843         if (es->es_el)
 844                 ea_set_remove_stuffed(ip, es->es_el);
 845
 846         error = gfs2_meta_inode_buffer(ip, &dibh);
 847         if (error)
 848                 goto out;
 849
 850         if (er->er_flags & GFS2_ERF_MODE) {
 851                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 852                         (ip->i_inode.i_mode & S_IFMT) == (er->er_mode & S_IFMT));
 853                 ip->i_inode.i_mode = er->er_mode;
 854         }
 855         ip->i_inode.i_ctime = CURRENT_TIME;
 856         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 857         gfs2_dinode_out(ip, dibh->b_data);
 858         brelse(dibh);
 859 out:
 860         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 861         return error;
 862 }
 863
 864 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 865                                struct gfs2_ea_request *er, void *private)
 866 {
 867         struct ea_set *es = private;
 868         struct gfs2_ea_header *ea = es->es_ea;
 869         int error;
 870
 871         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 872
 873         if (es->ea_split)
 874                 ea = ea_split_ea(ea);
 875
 876         error = ea_write(ip, ea, er);
 877         if (error)
 878                 return error;
 879
 880         if (es->es_el)
 881                 ea_set_remove_stuffed(ip, es->es_el);
 882
 883         return 0;
 884 }
 885
 886 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 887                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 888                          void *private)
 889 {
 890         struct ea_set *es = private;
 891         unsigned int size;
 892         int stuffed;
 893         int error;
 894
 895         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er, &size);
 896
 897         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 898                 if (GFS2_EA_REC_LEN(ea) < size)
 899                         return 0;
 900                 if (!GFS2_EA_IS_STUFFED(ea)) {
 901                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 902                         if (error)
 903                                 return error;
 904                 }
 905                 es->ea_split = 0;
 906         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 907                 es->ea_split = 1;
 908         else
 909                 return 0;
 910
 911         if (stuffed) {
 912                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 913                 if (error)
 914                         return error;
 915         } else {
 916                 unsigned int blks;
 917
 918                 es->es_bh = bh;
 919                 es->es_ea = ea;
 920                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 921                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 922
 923                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 924                                           ea_set_simple_alloc, es);
 925                 if (error)
 926                         return error;
 927         }
 928
 929         return 1;
 930 }
 931
 932 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 933                         void *private)
 934 {
 935         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 936         struct buffer_head *indbh, *newbh;
 937         __be64 *eablk;
 938         int error;
 939         int mh_size = sizeof(struct gfs2_meta_header);
 940
 941         if (ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT) {
 942                 __be64 *end;
 943
 944                 error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT,
 945                                        &indbh);
 946                 if (error)
 947                         return error;
 948
 949                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 950                         error = -EIO;
 951                         goto out;
 952                 }
 953
 954                 eablk = (__be64 *)(indbh->b_data + mh_size);
 955                 end = eablk + sdp->sd_inptrs;
 956
 957                 for (; eablk < end; eablk++)
 958                         if (!*eablk)
 959                                 break;
 960
 961                 if (eablk == end) {
 962                         error = -ENOSPC;
 963                         goto out;
 964                 }
 965
 966                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 967         } else {
 968                 u64 blk;
 969
 970                 blk = gfs2_alloc_meta(ip);
 971
 972                 indbh = gfs2_meta_new(ip->i_gl, blk);
 973                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 974                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
 975                 gfs2_buffer_clear_tail(indbh, mh_size);
 976
 977                 eablk = (__be64 *)(indbh->b_data + mh_size);
 978                 *eablk = cpu_to_be64(ip->i_di.di_eattr);
 979                 ip->i_di.di_eattr = blk;
 980                 ip->i_di.di_flags |= GFS2_DIF_EA_INDIRECT;
 981                 ip->i_di.di_blocks++;
 982                 gfs2_set_inode_blocks(&ip->i_inode);
 983
 984                 eablk++;
 985         }
 986
 987         error = ea_alloc_blk(ip, &newbh);
 988         if (error)
 989                 goto out;
 990
 991         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
 992         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
 993         brelse(newbh);
 994         if (error)
 995                 goto out;
 996
 997         if (private)
 998                 ea_set_remove_stuffed(ip, private);
 999
1000 out:
1001         brelse(indbh);
1002         return error;
1003 }
1004
1005 static int ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
1006                     struct gfs2_ea_location *el)
1007 {
1008         struct ea_set es;
1009         unsigned int blks = 2;
1010         int error;
1011
1012         memset(&es, 0, sizeof(struct ea_set));
1013         es.es_er = er;
1014         es.es_el = el;
1015
1016         error = ea_foreach(ip, ea_set_simple, &es);
1017         if (error > 0)
1018                 return 0;
1019         if (error)
1020                 return error;
1021
1022         if (!(ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT))
1023                 blks++;
1024         if (GFS2_EAREQ_SIZE_STUFFED(er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1025                 blks += DIV_ROUND_UP(er->er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1026
1027         return ea_alloc_skeleton(ip, er, blks, ea_set_block, el);
1028 }
1029
1030 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1031                                    struct gfs2_ea_location *el)
1032 {
1033         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1034                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1035                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1036                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1037         }
1038
1039         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev,0);
1040 }
1041
1042 int gfs2_ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1043 {
1044         struct gfs2_ea_location el;
1045         int error;
1046
1047         if (!ip->i_di.di_eattr) {
1048                 if (er->er_flags & XATTR_REPLACE)
1049                         return -ENODATA;
1050                 return ea_init(ip, er);
1051         }
1052
1053         error = gfs2_ea_find(ip, er, &el);
1054         if (error)
1055                 return error;
1056
1057         if (el.el_ea) {
1058                 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY) {
1059                         brelse(el.el_bh);
1060                         return -EPERM;
1061                 }
1062
1063                 error = -EEXIST;
1064                 if (!(er->er_flags & XATTR_CREATE)) {
1065                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1066                         error = ea_set_i(ip, er, &el);
1067                         if (!error && unstuffed)
1068                                 ea_set_remove_unstuffed(ip, &el);
1069                 }
1070
1071                 brelse(el.el_bh);
1072         } else {
1073                 error = -ENODATA;
1074                 if (!(er->er_flags & XATTR_REPLACE))
1075                         error = ea_set_i(ip, er, NULL);
1076         }
1077
1078         return error;
1079 }
1080
1081 int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1082 {
1083         struct gfs2_holder i_gh;
1084         int error;
1085
1086         if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1087                 return -EINVAL;
1088         if (!er->er_data || !er->er_data_len) {
1089                 er->er_data = NULL;
1090                 er->er_data_len = 0;
1091         }
1092         error = ea_check_size(GFS2_SB(&ip->i_inode), er);
1093         if (error)
1094                 return error;
1095
1096         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1097         if (error)
1098                 return error;
1099
1100         if (IS_IMMUTABLE(&ip->i_inode))
1101                 error = -EPERM;
1102         else
1103                 error = gfs2_ea_ops[er->er_type]->eo_set(ip, er);
1104
1105         gfs2_glock_dq_uninit(&i_gh);
1106
1107         return error;
1108 }
1109
1110 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1111 {
1112         struct gfs2_ea_header *ea = el->el_ea;
1113         struct gfs2_ea_header *prev = el->el_prev;
1114         struct buffer_head *dibh;
1115         int error;
1116
1117         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1118         if (error)
1119                 return error;
1120
1121         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1122
1123         if (prev) {
1124                 u32 len;
1125
1126                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1127                 prev->ea_rec_len = cpu_to_be32(len);
1128
1129                 if (GFS2_EA_IS_LAST(ea))
1130                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1131         } else
1132                 ea->ea_type = GFS2_EATYPE_UNUSED;
1133
1134         error = gfs2_meta_inode_buffer(ip, &dibh);
1135         if (!error) {
1136                 ip->i_inode.i_ctime = CURRENT_TIME;
1137                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1138                 gfs2_dinode_out(ip, dibh->b_data);
1139                 brelse(dibh);
1140         }
1141
1142         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1143
1144         return error;
1145 }
1146
1147 int gfs2_ea_remove_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1148 {
1149         struct gfs2_ea_location el;
1150         int error;
1151
1152         if (!ip->i_di.di_eattr)
1153                 return -ENODATA;
1154
1155         error = gfs2_ea_find(ip, er, &el);
1156         if (error)
1157                 return error;
1158         if (!el.el_ea)
1159                 return -ENODATA;
1160
1161         if (GFS2_EA_IS_STUFFED(el.el_ea))
1162                 error = ea_remove_stuffed(ip, &el);
1163         else
1164                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev,
1165                                             0);
1166
1167         brelse(el.el_bh);
1168
1169         return error;
1170 }
1171
1172 /**
1173  * gfs2_ea_remove - sets (or creates or replaces) an extended attribute
1174  * @ip: pointer to the inode of the target file
1175  * @er: request information
1176  *
1177  * Returns: errno
1178  */
1179
1180 int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1181 {
1182         struct gfs2_holder i_gh;
1183         int error;
1184
1185         if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1186                 return -EINVAL;
1187
1188         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1189         if (error)
1190                 return error;
1191
1192         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1193                 error = -EPERM;
1194         else
1195                 error = gfs2_ea_ops[er->er_type]->eo_remove(ip, er);
1196
1197         gfs2_glock_dq_uninit(&i_gh);
1198
1199         return error;
1200 }
1201
1202 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1203                                   struct gfs2_ea_header *ea, char *data)
1204 {
1205         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1206         struct buffer_head **bh;
1207         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1208         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1209         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1210         unsigned int x;
1211         int error;
1212
1213         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_KERNEL);
1214         if (!bh)
1215                 return -ENOMEM;
1216
1217         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1218         if (error)
1219                 goto out;
1220
1221         for (x = 0; x < nptrs; x++) {
1222                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1223                                        bh + x);
1224                 if (error) {
1225                         while (x--)
1226                                 brelse(bh[x]);
1227                         goto fail;
1228                 }
1229                 dataptrs++;
1230         }
1231
1232         for (x = 0; x < nptrs; x++) {
1233                 error = gfs2_meta_wait(sdp, bh[x]);
1234                 if (error) {
1235                         for (; x < nptrs; x++)
1236                                 brelse(bh[x]);
1237                         goto fail;
1238                 }
1239                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1240                         for (; x < nptrs; x++)
1241                                 brelse(bh[x]);
1242                         error = -EIO;
1243                         goto fail;
1244                 }
1245
1246                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1247
1248                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1249                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1250
1251                 amount -= sdp->sd_jbsize;
1252                 data += sdp->sd_jbsize;
1253
1254                 brelse(bh[x]);
1255         }
1256
1257 out:
1258         kfree(bh);
1259         return error;
1260
1261 fail:
1262         gfs2_trans_end(sdp);
1263         kfree(bh);
1264         return error;
1265 }
1266
1267 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
1268                       struct iattr *attr, char *data)
1269 {
1270         struct buffer_head *dibh;
1271         int error;
1272
1273         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
1274                 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1275                 if (error)
1276                         return error;
1277
1278                 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1279                 memcpy(GFS2_EA2DATA(el->el_ea), data,
1280                        GFS2_EA_DATA_LEN(el->el_ea));
1281         } else
1282                 error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);
1283
1284         if (error)
1285                 return error;
1286
1287         error = gfs2_meta_inode_buffer(ip, &dibh);
1288         if (!error) {
1289                 error = inode_setattr(&ip->i_inode, attr);
1290                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1291                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1292                 gfs2_dinode_out(ip, dibh->b_data);
1293                 brelse(dibh);
1294         }
1295
1296         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1297
1298         return error;
1299 }
1300
1301 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1302 {
1303         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1304         struct gfs2_rgrp_list rlist;
1305         struct buffer_head *indbh, *dibh;
1306         __be64 *eablk, *end;
1307         unsigned int rg_blocks = 0;
1308         u64 bstart = 0;
1309         unsigned int blen = 0;
1310         unsigned int blks = 0;
1311         unsigned int x;
1312         int error;
1313
1314         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1315
1316         error = gfs2_meta_read(ip->i_gl, ip->i_di.di_eattr, DIO_WAIT, &indbh);
1317         if (error)
1318                 return error;
1319
1320         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1321                 error = -EIO;
1322                 goto out;
1323         }
1324
1325         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1326         end = eablk + sdp->sd_inptrs;
1327
1328         for (; eablk < end; eablk++) {
1329                 u64 bn;
1330
1331                 if (!*eablk)
1332                         break;
1333                 bn = be64_to_cpu(*eablk);
1334
1335                 if (bstart + blen == bn)
1336                         blen++;
1337                 else {
1338                         if (bstart)
1339                                 gfs2_rlist_add(sdp, &rlist, bstart);
1340                         bstart = bn;
1341                         blen = 1;
1342                 }
1343                 blks++;
1344         }
1345         if (bstart)
1346                 gfs2_rlist_add(sdp, &rlist, bstart);
1347         else
1348                 goto out;
1349
1350         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0);
1351
1352         for (x = 0; x < rlist.rl_rgrps; x++) {
1353                 struct gfs2_rgrpd *rgd;
1354                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1355                 rg_blocks += rgd->rd_length;
1356         }
1357
1358         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1359         if (error)
1360                 goto out_rlist_free;
1361
1362         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1363                                  RES_STATFS + RES_QUOTA, blks);
1364         if (error)
1365                 goto out_gunlock;
1366
1367         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1368
1369         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1370         bstart = 0;
1371         blen = 0;
1372
1373         for (; eablk < end; eablk++) {
1374                 u64 bn;
1375
1376                 if (!*eablk)
1377                         break;
1378                 bn = be64_to_cpu(*eablk);
1379
1380                 if (bstart + blen == bn)
1381                         blen++;
1382                 else {
1383                         if (bstart)
1384                                 gfs2_free_meta(ip, bstart, blen);
1385                         bstart = bn;
1386                         blen = 1;
1387                 }
1388
1389                 *eablk = 0;
1390                 if (!ip->i_di.di_blocks)
1391                         gfs2_consist_inode(ip);
1392                 ip->i_di.di_blocks--;
1393                 gfs2_set_inode_blocks(&ip->i_inode);
1394         }
1395         if (bstart)
1396                 gfs2_free_meta(ip, bstart, blen);
1397
1398         ip->i_di.di_flags &= ~GFS2_DIF_EA_INDIRECT;
1399
1400         error = gfs2_meta_inode_buffer(ip, &dibh);
1401         if (!error) {
1402                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1403                 gfs2_dinode_out(ip, dibh->b_data);
1404                 brelse(dibh);
1405         }
1406
1407         gfs2_trans_end(sdp);
1408
1409 out_gunlock:
1410         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1411 out_rlist_free:
1412         gfs2_rlist_free(&rlist);
1413 out:
1414         brelse(indbh);
1415         return error;
1416 }
1417
1418 static int ea_dealloc_block(struct gfs2_inode *ip)
1419 {
1420         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1421         struct gfs2_alloc *al = ip->i_alloc;
1422         struct gfs2_rgrpd *rgd;
1423         struct buffer_head *dibh;
1424         int error;
1425
1426         rgd = gfs2_blk2rgrpd(sdp, ip->i_di.di_eattr);
1427         if (!rgd) {
1428                 gfs2_consist_inode(ip);
1429                 return -EIO;
1430         }
1431
1432         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1433                                    &al->al_rgd_gh);
1434         if (error)
1435                 return error;
1436
1437         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1438                                  RES_QUOTA, 1);
1439         if (error)
1440                 goto out_gunlock;
1441
1442         gfs2_free_meta(ip, ip->i_di.di_eattr, 1);
1443
1444         ip->i_di.di_eattr = 0;
1445         if (!ip->i_di.di_blocks)
1446                 gfs2_consist_inode(ip);
1447         ip->i_di.di_blocks--;
1448         gfs2_set_inode_blocks(&ip->i_inode);
1449
1450         error = gfs2_meta_inode_buffer(ip, &dibh);
1451         if (!error) {
1452                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1453                 gfs2_dinode_out(ip, dibh->b_data);
1454                 brelse(dibh);
1455         }
1456
1457         gfs2_trans_end(sdp);
1458
1459 out_gunlock:
1460         gfs2_glock_dq_uninit(&al->al_rgd_gh);
1461         return error;
1462 }
1463
1464 /**
1465  * gfs2_ea_dealloc - deallocate the extended attribute fork
1466  * @ip: the inode
1467  *
1468  * Returns: errno
1469  */
1470
1471 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1472 {
1473         struct gfs2_alloc *al;
1474         int error;
1475
1476         al = gfs2_alloc_get(ip);
1477
1478         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1479         if (error)
1480                 goto out_alloc;
1481
1482         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1483         if (error)
1484                 goto out_quota;
1485
1486         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1487         if (error)
1488                 goto out_rindex;
1489
1490         if (ip->i_di.di_flags & GFS2_DIF_EA_INDIRECT) {
1491                 error = ea_dealloc_indirect(ip);
1492                 if (error)
1493                         goto out_rindex;
1494         }
1495
1496         error = ea_dealloc_block(ip);
1497
1498 out_rindex:
1499         gfs2_glock_dq_uninit(&al->al_ri_gh);
1500 out_quota:
1501         gfs2_quota_unhold(ip);
1502 out_alloc:
1503         gfs2_alloc_put(ip);
1504         return error;
1505 }
1506