fs/gfs2/xattr.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 <asm/uaccess.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include "glock.h"
  23 #include "inode.h"
  24 #include "meta_io.h"
  25 #include "quota.h"
  26 #include "rgrp.h"
  27 #include "trans.h"
  28 #include "util.h"
  29
  30 /**
  31  * ea_calc_size - returns the acutal number of bytes the request will take up
  32  *                (not counting any unstuffed data blocks)
  33  * @sdp:
  34  * @er:
  35  * @size:
  36  *
  37  * Returns: 1 if the EA should be stuffed
  38  */
  39
  40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  41                         unsigned int *size)
  42 {
  43         unsigned int jbsize = sdp->sd_jbsize;
  44
  45         /* Stuffed */
  46         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  47
  48         if (*size <= jbsize)
  49                 return 1;
  50
  51         /* Unstuffed */
  52         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  53                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  54
  55         return 0;
  56 }
  57
  58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  59 {
  60         unsigned int size;
  61
  62         if (dsize > GFS2_EA_MAX_DATA_LEN)
  63                 return -ERANGE;
  64
  65         ea_calc_size(sdp, nsize, dsize, &size);
  66
  67         /* This can only happen with 512 byte blocks */
  68         if (size > sdp->sd_jbsize)
  69                 return -ERANGE;
  70
  71         return 0;
  72 }
  73
  74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  75                           struct gfs2_ea_header *ea,
  76                           struct gfs2_ea_header *prev, void *private);
  77
  78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  79                         ea_call_t ea_call, void *data)
  80 {
  81         struct gfs2_ea_header *ea, *prev = NULL;
  82         int error = 0;
  83
  84         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  85                 return -EIO;
  86
  87         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  88                 if (!GFS2_EA_REC_LEN(ea))
  89                         goto fail;
  90                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  91                                                   bh->b_data + bh->b_size))
  92                         goto fail;
  93                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  94                         goto fail;
  95
  96                 error = ea_call(ip, bh, ea, prev, data);
  97                 if (error)
  98                         return error;
  99
 100                 if (GFS2_EA_IS_LAST(ea)) {
 101                         if ((char *)GFS2_EA2NEXT(ea) !=
 102                             bh->b_data + bh->b_size)
 103                                 goto fail;
 104                         break;
 105                 }
 106         }
 107
 108         return error;
 109
 110 fail:
 111         gfs2_consist_inode(ip);
 112         return -EIO;
 113 }
 114
 115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116 {
 117         struct buffer_head *bh, *eabh;
 118         __be64 *eablk, *end;
 119         int error;
 120
 121         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 122         if (error)
 123                 return error;
 124
 125         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 126                 error = ea_foreach_i(ip, bh, ea_call, data);
 127                 goto out;
 128         }
 129
 130         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 131                 error = -EIO;
 132                 goto out;
 133         }
 134
 135         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 136         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 137
 138         for (; eablk < end; eablk++) {
 139                 u64 bn;
 140
 141                 if (!*eablk)
 142                         break;
 143                 bn = be64_to_cpu(*eablk);
 144
 145                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 146                 if (error)
 147                         break;
 148                 error = ea_foreach_i(ip, eabh, ea_call, data);
 149                 brelse(eabh);
 150                 if (error)
 151                         break;
 152         }
 153 out:
 154         brelse(bh);
 155         return error;
 156 }
 157
 158 struct ea_find {
 159         int type;
 160         const char *name;
 161         size_t namel;
 162         struct gfs2_ea_location *ef_el;
 163 };
 164
 165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 166                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 167                      void *private)
 168 {
 169         struct ea_find *ef = private;
 170
 171         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 172                 return 0;
 173
 174         if (ea->ea_type == ef->type) {
 175                 if (ea->ea_name_len == ef->namel &&
 176                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 177                         struct gfs2_ea_location *el = ef->ef_el;
 178                         get_bh(bh);
 179                         el->el_bh = bh;
 180                         el->el_ea = ea;
 181                         el->el_prev = prev;
 182                         return 1;
 183                 }
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 190                         struct gfs2_ea_location *el)
 191 {
 192         struct ea_find ef;
 193         int error;
 194
 195         ef.type = type;
 196         ef.name = name;
 197         ef.namel = strlen(name);
 198         ef.ef_el = el;
 199
 200         memset(el, 0, sizeof(struct gfs2_ea_location));
 201
 202         error = ea_foreach(ip, ea_find_i, &ef);
 203         if (error > 0)
 204                 return 0;
 205
 206         return error;
 207 }
 208
 209 /**
 210  * ea_dealloc_unstuffed -
 211  * @ip:
 212  * @bh:
 213  * @ea:
 214  * @prev:
 215  * @private:
 216  *
 217  * Take advantage of the fact that all unstuffed blocks are
 218  * allocated from the same RG.  But watch, this may not always
 219  * be true.
 220  *
 221  * Returns: errno
 222  */
 223
 224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 225                                 struct gfs2_ea_header *ea,
 226                                 struct gfs2_ea_header *prev, void *private)
 227 {
 228         int *leave = private;
 229         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230         struct gfs2_rgrpd *rgd;
 231         struct gfs2_holder rg_gh;
 232         struct buffer_head *dibh;
 233         __be64 *dataptrs;
 234         u64 bn = 0;
 235         u64 bstart = 0;
 236         unsigned int blen = 0;
 237         unsigned int blks = 0;
 238         unsigned int x;
 239         int error;
 240
 241         error = gfs2_rindex_update(sdp);
 242         if (error)
 243                 return error;
 244
 245         if (GFS2_EA_IS_STUFFED(ea))
 246                 return 0;
 247
 248         dataptrs = GFS2_EA2DATAPTRS(ea);
 249         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 250                 if (*dataptrs) {
 251                         blks++;
 252                         bn = be64_to_cpu(*dataptrs);
 253                 }
 254         }
 255         if (!blks)
 256                 return 0;
 257
 258         rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 259         if (!rgd) {
 260                 gfs2_consist_inode(ip);
 261                 return -EIO;
 262         }
 263
 264         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 265         if (error)
 266                 return error;
 267
 268         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 269                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 270         if (error)
 271                 goto out_gunlock;
 272
 273         gfs2_trans_add_meta(ip->i_gl, bh);
 274
 275         dataptrs = GFS2_EA2DATAPTRS(ea);
 276         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 277                 if (!*dataptrs)
 278                         break;
 279                 bn = be64_to_cpu(*dataptrs);
 280
 281                 if (bstart + blen == bn)
 282                         blen++;
 283                 else {
 284                         if (bstart)
 285                                 gfs2_free_meta(ip, bstart, blen);
 286                         bstart = bn;
 287                         blen = 1;
 288                 }
 289
 290                 *dataptrs = 0;
 291                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 292         }
 293         if (bstart)
 294                 gfs2_free_meta(ip, bstart, blen);
 295
 296         if (prev && !leave) {
 297                 u32 len;
 298
 299                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 300                 prev->ea_rec_len = cpu_to_be32(len);
 301
 302                 if (GFS2_EA_IS_LAST(ea))
 303                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 304         } else {
 305                 ea->ea_type = GFS2_EATYPE_UNUSED;
 306                 ea->ea_num_ptrs = 0;
 307         }
 308
 309         error = gfs2_meta_inode_buffer(ip, &dibh);
 310         if (!error) {
 311                 ip->i_inode.i_ctime = CURRENT_TIME;
 312                 gfs2_trans_add_meta(ip->i_gl, dibh);
 313                 gfs2_dinode_out(ip, dibh->b_data);
 314                 brelse(dibh);
 315         }
 316
 317         gfs2_trans_end(sdp);
 318
 319 out_gunlock:
 320         gfs2_glock_dq_uninit(&rg_gh);
 321         return error;
 322 }
 323
 324 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 325                                struct gfs2_ea_header *ea,
 326                                struct gfs2_ea_header *prev, int leave)
 327 {
 328         int error;
 329
 330         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 331         if (error)
 332                 return error;
 333
 334         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 335         if (error)
 336                 goto out_alloc;
 337
 338         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 339
 340         gfs2_quota_unhold(ip);
 341 out_alloc:
 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 inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 351 {
 352         switch (ea->ea_type) {
 353         case GFS2_EATYPE_USR:
 354                 return 5 + ea->ea_name_len + 1;
 355         case GFS2_EATYPE_SYS:
 356                 return 7 + ea->ea_name_len + 1;
 357         case GFS2_EATYPE_SECURITY:
 358                 return 9 + ea->ea_name_len + 1;
 359         default:
 360                 return 0;
 361         }
 362 }
 363
 364 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 365                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 366                      void *private)
 367 {
 368         struct ea_list *ei = private;
 369         struct gfs2_ea_request *er = ei->ei_er;
 370         unsigned int ea_size = gfs2_ea_strlen(ea);
 371
 372         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 373                 return 0;
 374
 375         if (er->er_data_len) {
 376                 char *prefix = NULL;
 377                 unsigned int l = 0;
 378                 char c = 0;
 379
 380                 if (ei->ei_size + ea_size > er->er_data_len)
 381                         return -ERANGE;
 382
 383                 switch (ea->ea_type) {
 384                 case GFS2_EATYPE_USR:
 385                         prefix = "user.";
 386                         l = 5;
 387                         break;
 388                 case GFS2_EATYPE_SYS:
 389                         prefix = "system.";
 390                         l = 7;
 391                         break;
 392                 case GFS2_EATYPE_SECURITY:
 393                         prefix = "security.";
 394                         l = 9;
 395                         break;
 396                 }
 397
 398                 BUG_ON(l == 0);
 399
 400                 memcpy(er->er_data + ei->ei_size, prefix, l);
 401                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 402                        ea->ea_name_len);
 403                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 404         }
 405
 406         ei->ei_size += ea_size;
 407
 408         return 0;
 409 }
 410
 411 /**
 412  * gfs2_listxattr - List gfs2 extended attributes
 413  * @dentry: The dentry whose inode we are interested in
 414  * @buffer: The buffer to write the results
 415  * @size: The size of the buffer
 416  *
 417  * Returns: actual size of data on success, -errno on error
 418  */
 419
 420 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 421 {
 422         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 423         struct gfs2_ea_request er;
 424         struct gfs2_holder i_gh;
 425         int error;
 426
 427         memset(&er, 0, sizeof(struct gfs2_ea_request));
 428         if (size) {
 429                 er.er_data = buffer;
 430                 er.er_data_len = size;
 431         }
 432
 433         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 434         if (error)
 435                 return error;
 436
 437         if (ip->i_eattr) {
 438                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 439
 440                 error = ea_foreach(ip, ea_list_i, &ei);
 441                 if (!error)
 442                         error = ei.ei_size;
 443         }
 444
 445         gfs2_glock_dq_uninit(&i_gh);
 446
 447         return error;
 448 }
 449
 450 /**
 451  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 452  *                     request buffer
 453  * @ip: The GFS2 inode
 454  * @ea: The extended attribute header structure
 455  * @din: The data to be copied in
 456  * @dout: The data to be copied out (one of din,dout will be NULL)
 457  *
 458  * Returns: errno
 459  */
 460
 461 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 462                                const char *din, char *dout)
 463 {
 464         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 465         struct buffer_head **bh;
 466         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 467         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 468         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 469         unsigned int x;
 470         int error = 0;
 471         unsigned char *pos;
 472         unsigned cp_size;
 473
 474         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 475         if (!bh)
 476                 return -ENOMEM;
 477
 478         for (x = 0; x < nptrs; x++) {
 479                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 480                                        bh + x);
 481                 if (error) {
 482                         while (x--)
 483                                 brelse(bh[x]);
 484                         goto out;
 485                 }
 486                 dataptrs++;
 487         }
 488
 489         for (x = 0; x < nptrs; x++) {
 490                 error = gfs2_meta_wait(sdp, bh[x]);
 491                 if (error) {
 492                         for (; x < nptrs; x++)
 493                                 brelse(bh[x]);
 494                         goto out;
 495                 }
 496                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 497                         for (; x < nptrs; x++)
 498                                 brelse(bh[x]);
 499                         error = -EIO;
 500                         goto out;
 501                 }
 502
 503                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 504                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 505
 506                 if (dout) {
 507                         memcpy(dout, pos, cp_size);
 508                         dout += sdp->sd_jbsize;
 509                 }
 510
 511                 if (din) {
 512                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 513                         memcpy(pos, din, cp_size);
 514                         din += sdp->sd_jbsize;
 515                 }
 516
 517                 amount -= sdp->sd_jbsize;
 518                 brelse(bh[x]);
 519         }
 520
 521 out:
 522         kfree(bh);
 523         return error;
 524 }
 525
 526 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 527                             char *data, size_t size)
 528 {
 529         int ret;
 530         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 531         if (len > size)
 532                 return -ERANGE;
 533
 534         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 535                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 536                 return len;
 537         }
 538         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 539         if (ret < 0)
 540                 return ret;
 541         return len;
 542 }
 543
 544 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 545 {
 546         struct gfs2_ea_location el;
 547         int error;
 548         int len;
 549         char *data;
 550
 551         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 552         if (error)
 553                 return error;
 554         if (!el.el_ea)
 555                 goto out;
 556         if (!GFS2_EA_DATA_LEN(el.el_ea))
 557                 goto out;
 558
 559         len = GFS2_EA_DATA_LEN(el.el_ea);
 560         data = kmalloc(len, GFP_NOFS);
 561         error = -ENOMEM;
 562         if (data == NULL)
 563                 goto out;
 564
 565         error = gfs2_ea_get_copy(ip, &el, data, len);
 566         if (error < 0)
 567                 kfree(data);
 568         else
 569                 *ppdata = data;
 570 out:
 571         brelse(el.el_bh);
 572         return error;
 573 }
 574
 575 /**
 576  * gfs2_xattr_get - Get a GFS2 extended attribute
 577  * @inode: The inode
 578  * @name: The name of the extended attribute
 579  * @buffer: The buffer to write the result into
 580  * @size: The size of the buffer
 581  * @type: The type of extended attribute
 582  *
 583  * Returns: actual size of data on success, -errno on error
 584  */
 585 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
 586                 void *buffer, size_t size, int type)
 587 {
 588         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 589         struct gfs2_ea_location el;
 590         int error;
 591
 592         if (!ip->i_eattr)
 593                 return -ENODATA;
 594         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 595                 return -EINVAL;
 596
 597         error = gfs2_ea_find(ip, type, name, &el);
 598         if (error)
 599                 return error;
 600         if (!el.el_ea)
 601                 return -ENODATA;
 602         if (size)
 603                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 604         else
 605                 error = GFS2_EA_DATA_LEN(el.el_ea);
 606         brelse(el.el_bh);
 607
 608         return error;
 609 }
 610
 611 /**
 612  * ea_alloc_blk - allocates a new block for extended attributes.
 613  * @ip: A pointer to the inode that's getting extended attributes
 614  * @bhp: Pointer to pointer to a struct buffer_head
 615  *
 616  * Returns: errno
 617  */
 618
 619 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 620 {
 621         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 622         struct gfs2_ea_header *ea;
 623         unsigned int n = 1;
 624         u64 block;
 625         int error;
 626
 627         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 628         if (error)
 629                 return error;
 630         gfs2_trans_add_unrevoke(sdp, block, 1);
 631         *bhp = gfs2_meta_new(ip->i_gl, block);
 632         gfs2_trans_add_meta(ip->i_gl, *bhp);
 633         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 634         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 635
 636         ea = GFS2_EA_BH2FIRST(*bhp);
 637         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 638         ea->ea_type = GFS2_EATYPE_UNUSED;
 639         ea->ea_flags = GFS2_EAFLAG_LAST;
 640         ea->ea_num_ptrs = 0;
 641
 642         gfs2_add_inode_blocks(&ip->i_inode, 1);
 643
 644         return 0;
 645 }
 646
 647 /**
 648  * ea_write - writes the request info to an ea, creating new blocks if
 649  *            necessary
 650  * @ip: inode that is being modified
 651  * @ea: the location of the new ea in a block
 652  * @er: the write request
 653  *
 654  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 655  *
 656  * returns : errno
 657  */
 658
 659 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 660                     struct gfs2_ea_request *er)
 661 {
 662         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 663         int error;
 664
 665         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 666         ea->ea_name_len = er->er_name_len;
 667         ea->ea_type = er->er_type;
 668         ea->__pad = 0;
 669
 670         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 671
 672         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 673                 ea->ea_num_ptrs = 0;
 674                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 675         } else {
 676                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 677                 const char *data = er->er_data;
 678                 unsigned int data_len = er->er_data_len;
 679                 unsigned int copy;
 680                 unsigned int x;
 681
 682                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 683                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 684                         struct buffer_head *bh;
 685                         u64 block;
 686                         int mh_size = sizeof(struct gfs2_meta_header);
 687                         unsigned int n = 1;
 688
 689                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 690                         if (error)
 691                                 return error;
 692                         gfs2_trans_add_unrevoke(sdp, block, 1);
 693                         bh = gfs2_meta_new(ip->i_gl, block);
 694                         gfs2_trans_add_meta(ip->i_gl, bh);
 695                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 696
 697                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 698
 699                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 700                                                            data_len;
 701                         memcpy(bh->b_data + mh_size, data, copy);
 702                         if (copy < sdp->sd_jbsize)
 703                                 memset(bh->b_data + mh_size + copy, 0,
 704                                        sdp->sd_jbsize - copy);
 705
 706                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 707                         data += copy;
 708                         data_len -= copy;
 709
 710                         brelse(bh);
 711                 }
 712
 713                 gfs2_assert_withdraw(sdp, !data_len);
 714         }
 715
 716         return 0;
 717 }
 718
 719 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 720                                    struct gfs2_ea_request *er, void *private);
 721
 722 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 723                              unsigned int blks,
 724                              ea_skeleton_call_t skeleton_call, void *private)
 725 {
 726         struct gfs2_alloc_parms ap = { .target = blks };
 727         struct buffer_head *dibh;
 728         int error;
 729
 730         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 731         if (error)
 732                 return error;
 733
 734         error = gfs2_quota_lock_check(ip);
 735         if (error)
 736                 return error;
 737
 738         error = gfs2_inplace_reserve(ip, &ap);
 739         if (error)
 740                 goto out_gunlock_q;
 741
 742         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 743                                  blks + gfs2_rg_blocks(ip, blks) +
 744                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 745         if (error)
 746                 goto out_ipres;
 747
 748         error = skeleton_call(ip, er, private);
 749         if (error)
 750                 goto out_end_trans;
 751
 752         error = gfs2_meta_inode_buffer(ip, &dibh);
 753         if (!error) {
 754                 ip->i_inode.i_ctime = CURRENT_TIME;
 755                 gfs2_trans_add_meta(ip->i_gl, dibh);
 756                 gfs2_dinode_out(ip, dibh->b_data);
 757                 brelse(dibh);
 758         }
 759
 760 out_end_trans:
 761         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 762 out_ipres:
 763         gfs2_inplace_release(ip);
 764 out_gunlock_q:
 765         gfs2_quota_unlock(ip);
 766         return error;
 767 }
 768
 769 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 770                      void *private)
 771 {
 772         struct buffer_head *bh;
 773         int error;
 774
 775         error = ea_alloc_blk(ip, &bh);
 776         if (error)
 777                 return error;
 778
 779         ip->i_eattr = bh->b_blocknr;
 780         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 781
 782         brelse(bh);
 783
 784         return error;
 785 }
 786
 787 /**
 788  * ea_init - initializes a new eattr block
 789  * @ip:
 790  * @er:
 791  *
 792  * Returns: errno
 793  */
 794
 795 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 796                    const void *data, size_t size)
 797 {
 798         struct gfs2_ea_request er;
 799         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 800         unsigned int blks = 1;
 801
 802         er.er_type = type;
 803         er.er_name = name;
 804         er.er_name_len = strlen(name);
 805         er.er_data = (void *)data;
 806         er.er_data_len = size;
 807
 808         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 809                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 810
 811         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 812 }
 813
 814 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 815 {
 816         u32 ea_size = GFS2_EA_SIZE(ea);
 817         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 818                                      ea_size);
 819         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 820         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 821
 822         ea->ea_rec_len = cpu_to_be32(ea_size);
 823         ea->ea_flags ^= last;
 824
 825         new->ea_rec_len = cpu_to_be32(new_size);
 826         new->ea_flags = last;
 827
 828         return new;
 829 }
 830
 831 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 832                                   struct gfs2_ea_location *el)
 833 {
 834         struct gfs2_ea_header *ea = el->el_ea;
 835         struct gfs2_ea_header *prev = el->el_prev;
 836         u32 len;
 837
 838         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 839
 840         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 841                 ea->ea_type = GFS2_EATYPE_UNUSED;
 842                 return;
 843         } else if (GFS2_EA2NEXT(prev) != ea) {
 844                 prev = GFS2_EA2NEXT(prev);
 845                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 846         }
 847
 848         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 849         prev->ea_rec_len = cpu_to_be32(len);
 850
 851         if (GFS2_EA_IS_LAST(ea))
 852                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 853 }
 854
 855 struct ea_set {
 856         int ea_split;
 857
 858         struct gfs2_ea_request *es_er;
 859         struct gfs2_ea_location *es_el;
 860
 861         struct buffer_head *es_bh;
 862         struct gfs2_ea_header *es_ea;
 863 };
 864
 865 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 866                                  struct gfs2_ea_header *ea, struct ea_set *es)
 867 {
 868         struct gfs2_ea_request *er = es->es_er;
 869         struct buffer_head *dibh;
 870         int error;
 871
 872         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 873         if (error)
 874                 return error;
 875
 876         gfs2_trans_add_meta(ip->i_gl, bh);
 877
 878         if (es->ea_split)
 879                 ea = ea_split_ea(ea);
 880
 881         ea_write(ip, ea, er);
 882
 883         if (es->es_el)
 884                 ea_set_remove_stuffed(ip, es->es_el);
 885
 886         error = gfs2_meta_inode_buffer(ip, &dibh);
 887         if (error)
 888                 goto out;
 889         ip->i_inode.i_ctime = CURRENT_TIME;
 890         gfs2_trans_add_meta(ip->i_gl, dibh);
 891         gfs2_dinode_out(ip, dibh->b_data);
 892         brelse(dibh);
 893 out:
 894         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 895         return error;
 896 }
 897
 898 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 899                                struct gfs2_ea_request *er, void *private)
 900 {
 901         struct ea_set *es = private;
 902         struct gfs2_ea_header *ea = es->es_ea;
 903         int error;
 904
 905         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 906
 907         if (es->ea_split)
 908                 ea = ea_split_ea(ea);
 909
 910         error = ea_write(ip, ea, er);
 911         if (error)
 912                 return error;
 913
 914         if (es->es_el)
 915                 ea_set_remove_stuffed(ip, es->es_el);
 916
 917         return 0;
 918 }
 919
 920 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 921                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 922                          void *private)
 923 {
 924         struct ea_set *es = private;
 925         unsigned int size;
 926         int stuffed;
 927         int error;
 928
 929         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 930                                es->es_er->er_data_len, &size);
 931
 932         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 933                 if (GFS2_EA_REC_LEN(ea) < size)
 934                         return 0;
 935                 if (!GFS2_EA_IS_STUFFED(ea)) {
 936                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 937                         if (error)
 938                                 return error;
 939                 }
 940                 es->ea_split = 0;
 941         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 942                 es->ea_split = 1;
 943         else
 944                 return 0;
 945
 946         if (stuffed) {
 947                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 948                 if (error)
 949                         return error;
 950         } else {
 951                 unsigned int blks;
 952
 953                 es->es_bh = bh;
 954                 es->es_ea = ea;
 955                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 956                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 957
 958                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 959                                           ea_set_simple_alloc, es);
 960                 if (error)
 961                         return error;
 962         }
 963
 964         return 1;
 965 }
 966
 967 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 968                         void *private)
 969 {
 970         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 971         struct buffer_head *indbh, *newbh;
 972         __be64 *eablk;
 973         int error;
 974         int mh_size = sizeof(struct gfs2_meta_header);
 975
 976         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 977                 __be64 *end;
 978
 979                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 980                                        &indbh);
 981                 if (error)
 982                         return error;
 983
 984                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 985                         error = -EIO;
 986                         goto out;
 987                 }
 988
 989                 eablk = (__be64 *)(indbh->b_data + mh_size);
 990                 end = eablk + sdp->sd_inptrs;
 991
 992                 for (; eablk < end; eablk++)
 993                         if (!*eablk)
 994                                 break;
 995
 996                 if (eablk == end) {
 997                         error = -ENOSPC;
 998                         goto out;
 999                 }
1000
1001                 gfs2_trans_add_meta(ip->i_gl, indbh);
1002         } else {
1003                 u64 blk;
1004                 unsigned int n = 1;
1005                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1006                 if (error)
1007                         return error;
1008                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1009                 indbh = gfs2_meta_new(ip->i_gl, blk);
1010                 gfs2_trans_add_meta(ip->i_gl, indbh);
1011                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1012                 gfs2_buffer_clear_tail(indbh, mh_size);
1013
1014                 eablk = (__be64 *)(indbh->b_data + mh_size);
1015                 *eablk = cpu_to_be64(ip->i_eattr);
1016                 ip->i_eattr = blk;
1017                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1018                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1019
1020                 eablk++;
1021         }
1022
1023         error = ea_alloc_blk(ip, &newbh);
1024         if (error)
1025                 goto out;
1026
1027         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1028         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1029         brelse(newbh);
1030         if (error)
1031                 goto out;
1032
1033         if (private)
1034                 ea_set_remove_stuffed(ip, private);
1035
1036 out:
1037         brelse(indbh);
1038         return error;
1039 }
1040
1041 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1042                     const void *value, size_t size, struct gfs2_ea_location *el)
1043 {
1044         struct gfs2_ea_request er;
1045         struct ea_set es;
1046         unsigned int blks = 2;
1047         int error;
1048
1049         er.er_type = type;
1050         er.er_name = name;
1051         er.er_data = (void *)value;
1052         er.er_name_len = strlen(name);
1053         er.er_data_len = size;
1054
1055         memset(&es, 0, sizeof(struct ea_set));
1056         es.es_er = &er;
1057         es.es_el = el;
1058
1059         error = ea_foreach(ip, ea_set_simple, &es);
1060         if (error > 0)
1061                 return 0;
1062         if (error)
1063                 return error;
1064
1065         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1066                 blks++;
1067         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1068                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1069
1070         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1071 }
1072
1073 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1074                                    struct gfs2_ea_location *el)
1075 {
1076         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1077                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1078                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1079                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1080         }
1081
1082         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1083 }
1084
1085 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1086 {
1087         struct gfs2_ea_header *ea = el->el_ea;
1088         struct gfs2_ea_header *prev = el->el_prev;
1089         struct buffer_head *dibh;
1090         int error;
1091
1092         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1093         if (error)
1094                 return error;
1095
1096         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1097
1098         if (prev) {
1099                 u32 len;
1100
1101                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1102                 prev->ea_rec_len = cpu_to_be32(len);
1103
1104                 if (GFS2_EA_IS_LAST(ea))
1105                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1106         } else {
1107                 ea->ea_type = GFS2_EATYPE_UNUSED;
1108         }
1109
1110         error = gfs2_meta_inode_buffer(ip, &dibh);
1111         if (!error) {
1112                 ip->i_inode.i_ctime = CURRENT_TIME;
1113                 gfs2_trans_add_meta(ip->i_gl, dibh);
1114                 gfs2_dinode_out(ip, dibh->b_data);
1115                 brelse(dibh);
1116         }
1117
1118         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1119
1120         return error;
1121 }
1122
1123 /**
1124  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1125  * @ip: The inode
1126  * @type: The type of the extended attribute
1127  * @name: The name of the extended attribute
1128  *
1129  * This is not called directly by the VFS since we use the (common)
1130  * scheme of making a "set with NULL data" mean a remove request. Note
1131  * that this is different from a set with zero length data.
1132  *
1133  * Returns: 0, or errno on failure
1134  */
1135
1136 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1137 {
1138         struct gfs2_ea_location el;
1139         int error;
1140
1141         if (!ip->i_eattr)
1142                 return -ENODATA;
1143
1144         error = gfs2_ea_find(ip, type, name, &el);
1145         if (error)
1146                 return error;
1147         if (!el.el_ea)
1148                 return -ENODATA;
1149
1150         if (GFS2_EA_IS_STUFFED(el.el_ea))
1151                 error = ea_remove_stuffed(ip, &el);
1152         else
1153                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1154
1155         brelse(el.el_bh);
1156
1157         return error;
1158 }
1159
1160 /**
1161  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1162  * @ip: The inode
1163  * @name: The name of the extended attribute
1164  * @value: The value of the extended attribute (NULL for remove)
1165  * @size: The size of the @value argument
1166  * @flags: Create or Replace
1167  * @type: The type of the extended attribute
1168  *
1169  * See gfs2_xattr_remove() for details of the removal of xattrs.
1170  *
1171  * Returns: 0 or errno on failure
1172  */
1173
1174 int __gfs2_xattr_set(struct inode *inode, const char *name,
1175                    const void *value, size_t size, int flags, int type)
1176 {
1177         struct gfs2_inode *ip = GFS2_I(inode);
1178         struct gfs2_sbd *sdp = GFS2_SB(inode);
1179         struct gfs2_ea_location el;
1180         unsigned int namel = strlen(name);
1181         int error;
1182
1183         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1184                 return -EPERM;
1185         if (namel > GFS2_EA_MAX_NAME_LEN)
1186                 return -ERANGE;
1187
1188         if (value == NULL)
1189                 return gfs2_xattr_remove(ip, type, name);
1190
1191         if (ea_check_size(sdp, namel, size))
1192                 return -ERANGE;
1193
1194         if (!ip->i_eattr) {
1195                 if (flags & XATTR_REPLACE)
1196                         return -ENODATA;
1197                 return ea_init(ip, type, name, value, size);
1198         }
1199
1200         error = gfs2_ea_find(ip, type, name, &el);
1201         if (error)
1202                 return error;
1203
1204         if (el.el_ea) {
1205                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1206                         brelse(el.el_bh);
1207                         return -EPERM;
1208                 }
1209
1210                 error = -EEXIST;
1211                 if (!(flags & XATTR_CREATE)) {
1212                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1213                         error = ea_set_i(ip, type, name, value, size, &el);
1214                         if (!error && unstuffed)
1215                                 ea_set_remove_unstuffed(ip, &el);
1216                 }
1217
1218                 brelse(el.el_bh);
1219                 return error;
1220         }
1221
1222         error = -ENODATA;
1223         if (!(flags & XATTR_REPLACE))
1224                 error = ea_set_i(ip, type, name, value, size, NULL);
1225
1226         return error;
1227 }
1228
1229 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1230                 const void *value, size_t size, int flags, int type)
1231 {
1232         return __gfs2_xattr_set(dentry->d_inode, name, value,
1233                                 size, flags, type);
1234 }
1235
1236
1237 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1238                                   struct gfs2_ea_header *ea, char *data)
1239 {
1240         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1241         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1242         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1243         int ret;
1244
1245         ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1246         if (ret)
1247                 return ret;
1248
1249         ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1250         gfs2_trans_end(sdp);
1251
1252         return ret;
1253 }
1254
1255 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1256 {
1257         struct inode *inode = &ip->i_inode;
1258         struct gfs2_sbd *sdp = GFS2_SB(inode);
1259         struct gfs2_ea_location el;
1260         int error;
1261
1262         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1263         if (error)
1264                 return error;
1265
1266         if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1267                 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1268                 if (error == 0) {
1269                         gfs2_trans_add_meta(ip->i_gl, el.el_bh);
1270                         memcpy(GFS2_EA2DATA(el.el_ea), data,
1271                                GFS2_EA_DATA_LEN(el.el_ea));
1272                 }
1273         } else {
1274                 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1275         }
1276
1277         brelse(el.el_bh);
1278         if (error)
1279                 return error;
1280
1281         error = gfs2_setattr_simple(inode, attr);
1282         gfs2_trans_end(sdp);
1283         return error;
1284 }
1285
1286 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1287 {
1288         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1289         struct gfs2_rgrp_list rlist;
1290         struct buffer_head *indbh, *dibh;
1291         __be64 *eablk, *end;
1292         unsigned int rg_blocks = 0;
1293         u64 bstart = 0;
1294         unsigned int blen = 0;
1295         unsigned int blks = 0;
1296         unsigned int x;
1297         int error;
1298
1299         error = gfs2_rindex_update(sdp);
1300         if (error)
1301                 return error;
1302
1303         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1304
1305         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1306         if (error)
1307                 return error;
1308
1309         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1310                 error = -EIO;
1311                 goto out;
1312         }
1313
1314         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1315         end = eablk + sdp->sd_inptrs;
1316
1317         for (; eablk < end; eablk++) {
1318                 u64 bn;
1319
1320                 if (!*eablk)
1321                         break;
1322                 bn = be64_to_cpu(*eablk);
1323
1324                 if (bstart + blen == bn)
1325                         blen++;
1326                 else {
1327                         if (bstart)
1328                                 gfs2_rlist_add(ip, &rlist, bstart);
1329                         bstart = bn;
1330                         blen = 1;
1331                 }
1332                 blks++;
1333         }
1334         if (bstart)
1335                 gfs2_rlist_add(ip, &rlist, bstart);
1336         else
1337                 goto out;
1338
1339         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1340
1341         for (x = 0; x < rlist.rl_rgrps; x++) {
1342                 struct gfs2_rgrpd *rgd;
1343                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1344                 rg_blocks += rgd->rd_length;
1345         }
1346
1347         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1348         if (error)
1349                 goto out_rlist_free;
1350
1351         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1352                                  RES_STATFS + RES_QUOTA, blks);
1353         if (error)
1354                 goto out_gunlock;
1355
1356         gfs2_trans_add_meta(ip->i_gl, indbh);
1357
1358         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1359         bstart = 0;
1360         blen = 0;
1361
1362         for (; eablk < end; eablk++) {
1363                 u64 bn;
1364
1365                 if (!*eablk)
1366                         break;
1367                 bn = be64_to_cpu(*eablk);
1368
1369                 if (bstart + blen == bn)
1370                         blen++;
1371                 else {
1372                         if (bstart)
1373                                 gfs2_free_meta(ip, bstart, blen);
1374                         bstart = bn;
1375                         blen = 1;
1376                 }
1377
1378                 *eablk = 0;
1379                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1380         }
1381         if (bstart)
1382                 gfs2_free_meta(ip, bstart, blen);
1383
1384         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1385
1386         error = gfs2_meta_inode_buffer(ip, &dibh);
1387         if (!error) {
1388                 gfs2_trans_add_meta(ip->i_gl, dibh);
1389                 gfs2_dinode_out(ip, dibh->b_data);
1390                 brelse(dibh);
1391         }
1392
1393         gfs2_trans_end(sdp);
1394
1395 out_gunlock:
1396         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1397 out_rlist_free:
1398         gfs2_rlist_free(&rlist);
1399 out:
1400         brelse(indbh);
1401         return error;
1402 }
1403
1404 static int ea_dealloc_block(struct gfs2_inode *ip)
1405 {
1406         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1407         struct gfs2_rgrpd *rgd;
1408         struct buffer_head *dibh;
1409         struct gfs2_holder gh;
1410         int error;
1411
1412         error = gfs2_rindex_update(sdp);
1413         if (error)
1414                 return error;
1415
1416         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1417         if (!rgd) {
1418                 gfs2_consist_inode(ip);
1419                 return -EIO;
1420         }
1421
1422         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1423         if (error)
1424                 return error;
1425
1426         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1427                                  RES_QUOTA, 1);
1428         if (error)
1429                 goto out_gunlock;
1430
1431         gfs2_free_meta(ip, ip->i_eattr, 1);
1432
1433         ip->i_eattr = 0;
1434         gfs2_add_inode_blocks(&ip->i_inode, -1);
1435
1436         error = gfs2_meta_inode_buffer(ip, &dibh);
1437         if (!error) {
1438                 gfs2_trans_add_meta(ip->i_gl, dibh);
1439                 gfs2_dinode_out(ip, dibh->b_data);
1440                 brelse(dibh);
1441         }
1442
1443         gfs2_trans_end(sdp);
1444
1445 out_gunlock:
1446         gfs2_glock_dq_uninit(&gh);
1447         return error;
1448 }
1449
1450 /**
1451  * gfs2_ea_dealloc - deallocate the extended attribute fork
1452  * @ip: the inode
1453  *
1454  * Returns: errno
1455  */
1456
1457 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1458 {
1459         int error;
1460
1461         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1462         if (error)
1463                 return error;
1464
1465         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1466         if (error)
1467                 return error;
1468
1469         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1470         if (error)
1471                 goto out_quota;
1472
1473         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1474                 error = ea_dealloc_indirect(ip);
1475                 if (error)
1476                         goto out_quota;
1477         }
1478
1479         error = ea_dealloc_block(ip);
1480
1481 out_quota:
1482         gfs2_quota_unhold(ip);
1483         return error;
1484 }
1485
1486 static const struct xattr_handler gfs2_xattr_user_handler = {
1487         .prefix = XATTR_USER_PREFIX,
1488         .flags  = GFS2_EATYPE_USR,
1489         .get    = gfs2_xattr_get,
1490         .set    = gfs2_xattr_set,
1491 };
1492
1493 static const struct xattr_handler gfs2_xattr_security_handler = {
1494         .prefix = XATTR_SECURITY_PREFIX,
1495         .flags  = GFS2_EATYPE_SECURITY,
1496         .get    = gfs2_xattr_get,
1497         .set    = gfs2_xattr_set,
1498 };
1499
1500 const struct xattr_handler *gfs2_xattr_handlers[] = {
1501         &gfs2_xattr_user_handler,
1502         &gfs2_xattr_security_handler,
1503         &gfs2_xattr_system_handler,
1504         NULL,
1505 };
1506