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 <linux/posix_acl_xattr.h>
  17 #include <asm/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "acl.h"
  22 #include "xattr.h"
  23 #include "glock.h"
  24 #include "inode.h"
  25 #include "meta_io.h"
  26 #include "quota.h"
  27 #include "rgrp.h"
  28 #include "trans.h"
  29 #include "util.h"
  30
  31 /**
  32  * ea_calc_size - returns the acutal number of bytes the request will take up
  33  *                (not counting any unstuffed data blocks)
  34  * @sdp:
  35  * @er:
  36  * @size:
  37  *
  38  * Returns: 1 if the EA should be stuffed
  39  */
  40
  41 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  42                         unsigned int *size)
  43 {
  44         unsigned int jbsize = sdp->sd_jbsize;
  45
  46         /* Stuffed */
  47         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  48
  49         if (*size <= jbsize)
  50                 return 1;
  51
  52         /* Unstuffed */
  53         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  54                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  55
  56         return 0;
  57 }
  58
  59 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  60 {
  61         unsigned int size;
  62
  63         if (dsize > GFS2_EA_MAX_DATA_LEN)
  64                 return -ERANGE;
  65
  66         ea_calc_size(sdp, nsize, dsize, &size);
  67
  68         /* This can only happen with 512 byte blocks */
  69         if (size > sdp->sd_jbsize)
  70                 return -ERANGE;
  71
  72         return 0;
  73 }
  74
  75 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  76                           struct gfs2_ea_header *ea,
  77                           struct gfs2_ea_header *prev, void *private);
  78
  79 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  80                         ea_call_t ea_call, void *data)
  81 {
  82         struct gfs2_ea_header *ea, *prev = NULL;
  83         int error = 0;
  84
  85         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  86                 return -EIO;
  87
  88         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  89                 if (!GFS2_EA_REC_LEN(ea))
  90                         goto fail;
  91                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  92                                                   bh->b_data + bh->b_size))
  93                         goto fail;
  94                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  95                         goto fail;
  96
  97                 error = ea_call(ip, bh, ea, prev, data);
  98                 if (error)
  99                         return error;
 100
 101                 if (GFS2_EA_IS_LAST(ea)) {
 102                         if ((char *)GFS2_EA2NEXT(ea) !=
 103                             bh->b_data + bh->b_size)
 104                                 goto fail;
 105                         break;
 106                 }
 107         }
 108
 109         return error;
 110
 111 fail:
 112         gfs2_consist_inode(ip);
 113         return -EIO;
 114 }
 115
 116 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 117 {
 118         struct buffer_head *bh, *eabh;
 119         __be64 *eablk, *end;
 120         int error;
 121
 122         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 123         if (error)
 124                 return error;
 125
 126         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 127                 error = ea_foreach_i(ip, bh, ea_call, data);
 128                 goto out;
 129         }
 130
 131         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 132                 error = -EIO;
 133                 goto out;
 134         }
 135
 136         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 137         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 138
 139         for (; eablk < end; eablk++) {
 140                 u64 bn;
 141
 142                 if (!*eablk)
 143                         break;
 144                 bn = be64_to_cpu(*eablk);
 145
 146                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 147                 if (error)
 148                         break;
 149                 error = ea_foreach_i(ip, eabh, ea_call, data);
 150                 brelse(eabh);
 151                 if (error)
 152                         break;
 153         }
 154 out:
 155         brelse(bh);
 156         return error;
 157 }
 158
 159 struct ea_find {
 160         int type;
 161         const char *name;
 162         size_t namel;
 163         struct gfs2_ea_location *ef_el;
 164 };
 165
 166 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 167                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 168                      void *private)
 169 {
 170         struct ea_find *ef = private;
 171
 172         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 173                 return 0;
 174
 175         if (ea->ea_type == ef->type) {
 176                 if (ea->ea_name_len == ef->namel &&
 177                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 178                         struct gfs2_ea_location *el = ef->ef_el;
 179                         get_bh(bh);
 180                         el->el_bh = bh;
 181                         el->el_ea = ea;
 182                         el->el_prev = prev;
 183                         return 1;
 184                 }
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 191                         struct gfs2_ea_location *el)
 192 {
 193         struct ea_find ef;
 194         int error;
 195
 196         ef.type = type;
 197         ef.name = name;
 198         ef.namel = strlen(name);
 199         ef.ef_el = el;
 200
 201         memset(el, 0, sizeof(struct gfs2_ea_location));
 202
 203         error = ea_foreach(ip, ea_find_i, &ef);
 204         if (error > 0)
 205                 return 0;
 206
 207         return error;
 208 }
 209
 210 /**
 211  * ea_dealloc_unstuffed -
 212  * @ip:
 213  * @bh:
 214  * @ea:
 215  * @prev:
 216  * @private:
 217  *
 218  * Take advantage of the fact that all unstuffed blocks are
 219  * allocated from the same RG.  But watch, this may not always
 220  * be true.
 221  *
 222  * Returns: errno
 223  */
 224
 225 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 226                                 struct gfs2_ea_header *ea,
 227                                 struct gfs2_ea_header *prev, void *private)
 228 {
 229         int *leave = private;
 230         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 231         struct gfs2_rgrpd *rgd;
 232         struct gfs2_holder rg_gh;
 233         struct buffer_head *dibh;
 234         __be64 *dataptrs;
 235         u64 bn = 0;
 236         u64 bstart = 0;
 237         unsigned int blen = 0;
 238         unsigned int blks = 0;
 239         unsigned int x;
 240         int error;
 241
 242         error = gfs2_rindex_update(sdp);
 243         if (error)
 244                 return error;
 245
 246         if (GFS2_EA_IS_STUFFED(ea))
 247                 return 0;
 248
 249         dataptrs = GFS2_EA2DATAPTRS(ea);
 250         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 251                 if (*dataptrs) {
 252                         blks++;
 253                         bn = be64_to_cpu(*dataptrs);
 254                 }
 255         }
 256         if (!blks)
 257                 return 0;
 258
 259         rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 260         if (!rgd) {
 261                 gfs2_consist_inode(ip);
 262                 return -EIO;
 263         }
 264
 265         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 266         if (error)
 267                 return error;
 268
 269         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 270                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 271         if (error)
 272                 goto out_gunlock;
 273
 274         gfs2_trans_add_meta(ip->i_gl, bh);
 275
 276         dataptrs = GFS2_EA2DATAPTRS(ea);
 277         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 278                 if (!*dataptrs)
 279                         break;
 280                 bn = be64_to_cpu(*dataptrs);
 281
 282                 if (bstart + blen == bn)
 283                         blen++;
 284                 else {
 285                         if (bstart)
 286                                 gfs2_free_meta(ip, bstart, blen);
 287                         bstart = bn;
 288                         blen = 1;
 289                 }
 290
 291                 *dataptrs = 0;
 292                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 293         }
 294         if (bstart)
 295                 gfs2_free_meta(ip, bstart, blen);
 296
 297         if (prev && !leave) {
 298                 u32 len;
 299
 300                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 301                 prev->ea_rec_len = cpu_to_be32(len);
 302
 303                 if (GFS2_EA_IS_LAST(ea))
 304                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 305         } else {
 306                 ea->ea_type = GFS2_EATYPE_UNUSED;
 307                 ea->ea_num_ptrs = 0;
 308         }
 309
 310         error = gfs2_meta_inode_buffer(ip, &dibh);
 311         if (!error) {
 312                 ip->i_inode.i_ctime = CURRENT_TIME;
 313                 gfs2_trans_add_meta(ip->i_gl, dibh);
 314                 gfs2_dinode_out(ip, dibh->b_data);
 315                 brelse(dibh);
 316         }
 317
 318         gfs2_trans_end(sdp);
 319
 320 out_gunlock:
 321         gfs2_glock_dq_uninit(&rg_gh);
 322         return error;
 323 }
 324
 325 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 326                                struct gfs2_ea_header *ea,
 327                                struct gfs2_ea_header *prev, int leave)
 328 {
 329         int error;
 330
 331         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 332         if (error)
 333                 return error;
 334
 335         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 336         if (error)
 337                 goto out_alloc;
 338
 339         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341         gfs2_quota_unhold(ip);
 342 out_alloc:
 343         return error;
 344 }
 345
 346 struct ea_list {
 347         struct gfs2_ea_request *ei_er;
 348         unsigned int ei_size;
 349 };
 350
 351 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 352 {
 353         switch (ea->ea_type) {
 354         case GFS2_EATYPE_USR:
 355                 return 5 + ea->ea_name_len + 1;
 356         case GFS2_EATYPE_SYS:
 357                 return 7 + ea->ea_name_len + 1;
 358         case GFS2_EATYPE_SECURITY:
 359                 return 9 + ea->ea_name_len + 1;
 360         default:
 361                 return 0;
 362         }
 363 }
 364
 365 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 366                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 367                      void *private)
 368 {
 369         struct ea_list *ei = private;
 370         struct gfs2_ea_request *er = ei->ei_er;
 371         unsigned int ea_size = gfs2_ea_strlen(ea);
 372
 373         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 374                 return 0;
 375
 376         if (er->er_data_len) {
 377                 char *prefix = NULL;
 378                 unsigned int l = 0;
 379                 char c = 0;
 380
 381                 if (ei->ei_size + ea_size > er->er_data_len)
 382                         return -ERANGE;
 383
 384                 switch (ea->ea_type) {
 385                 case GFS2_EATYPE_USR:
 386                         prefix = "user.";
 387                         l = 5;
 388                         break;
 389                 case GFS2_EATYPE_SYS:
 390                         prefix = "system.";
 391                         l = 7;
 392                         break;
 393                 case GFS2_EATYPE_SECURITY:
 394                         prefix = "security.";
 395                         l = 9;
 396                         break;
 397                 }
 398
 399                 BUG_ON(l == 0);
 400
 401                 memcpy(er->er_data + ei->ei_size, prefix, l);
 402                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 403                        ea->ea_name_len);
 404                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 405         }
 406
 407         ei->ei_size += ea_size;
 408
 409         return 0;
 410 }
 411
 412 /**
 413  * gfs2_listxattr - List gfs2 extended attributes
 414  * @dentry: The dentry whose inode we are interested in
 415  * @buffer: The buffer to write the results
 416  * @size: The size of the buffer
 417  *
 418  * Returns: actual size of data on success, -errno on error
 419  */
 420
 421 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 422 {
 423         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 424         struct gfs2_ea_request er;
 425         struct gfs2_holder i_gh;
 426         int error;
 427
 428         memset(&er, 0, sizeof(struct gfs2_ea_request));
 429         if (size) {
 430                 er.er_data = buffer;
 431                 er.er_data_len = size;
 432         }
 433
 434         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 435         if (error)
 436                 return error;
 437
 438         if (ip->i_eattr) {
 439                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 440
 441                 error = ea_foreach(ip, ea_list_i, &ei);
 442                 if (!error)
 443                         error = ei.ei_size;
 444         }
 445
 446         gfs2_glock_dq_uninit(&i_gh);
 447
 448         return error;
 449 }
 450
 451 /**
 452  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 453  *                     request buffer
 454  * @ip: The GFS2 inode
 455  * @ea: The extended attribute header structure
 456  * @din: The data to be copied in
 457  * @dout: The data to be copied out (one of din,dout will be NULL)
 458  *
 459  * Returns: errno
 460  */
 461
 462 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 463                                const char *din, char *dout)
 464 {
 465         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 466         struct buffer_head **bh;
 467         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 468         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 469         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 470         unsigned int x;
 471         int error = 0;
 472         unsigned char *pos;
 473         unsigned cp_size;
 474
 475         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 476         if (!bh)
 477                 return -ENOMEM;
 478
 479         for (x = 0; x < nptrs; x++) {
 480                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 481                                        bh + x);
 482                 if (error) {
 483                         while (x--)
 484                                 brelse(bh[x]);
 485                         goto out;
 486                 }
 487                 dataptrs++;
 488         }
 489
 490         for (x = 0; x < nptrs; x++) {
 491                 error = gfs2_meta_wait(sdp, bh[x]);
 492                 if (error) {
 493                         for (; x < nptrs; x++)
 494                                 brelse(bh[x]);
 495                         goto out;
 496                 }
 497                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 498                         for (; x < nptrs; x++)
 499                                 brelse(bh[x]);
 500                         error = -EIO;
 501                         goto out;
 502                 }
 503
 504                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 505                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 506
 507                 if (dout) {
 508                         memcpy(dout, pos, cp_size);
 509                         dout += sdp->sd_jbsize;
 510                 }
 511
 512                 if (din) {
 513                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 514                         memcpy(pos, din, cp_size);
 515                         din += sdp->sd_jbsize;
 516                 }
 517
 518                 amount -= sdp->sd_jbsize;
 519                 brelse(bh[x]);
 520         }
 521
 522 out:
 523         kfree(bh);
 524         return error;
 525 }
 526
 527 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 528                             char *data, size_t size)
 529 {
 530         int ret;
 531         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 532         if (len > size)
 533                 return -ERANGE;
 534
 535         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 536                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 537                 return len;
 538         }
 539         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 540         if (ret < 0)
 541                 return ret;
 542         return len;
 543 }
 544
 545 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 546 {
 547         struct gfs2_ea_location el;
 548         int error;
 549         int len;
 550         char *data;
 551
 552         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 553         if (error)
 554                 return error;
 555         if (!el.el_ea)
 556                 goto out;
 557         if (!GFS2_EA_DATA_LEN(el.el_ea))
 558                 goto out;
 559
 560         len = GFS2_EA_DATA_LEN(el.el_ea);
 561         data = kmalloc(len, GFP_NOFS);
 562         error = -ENOMEM;
 563         if (data == NULL)
 564                 goto out;
 565
 566         error = gfs2_ea_get_copy(ip, &el, data, len);
 567         if (error < 0)
 568                 kfree(data);
 569         else
 570                 *ppdata = data;
 571 out:
 572         brelse(el.el_bh);
 573         return error;
 574 }
 575
 576 /**
 577  * gfs2_xattr_get - Get a GFS2 extended attribute
 578  * @inode: The inode
 579  * @name: The name of the extended attribute
 580  * @buffer: The buffer to write the result into
 581  * @size: The size of the buffer
 582  * @type: The type of extended attribute
 583  *
 584  * Returns: actual size of data on success, -errno on error
 585  */
 586 static int gfs2_xattr_get(const struct xattr_handler *handler,
 587                           struct dentry *dentry, const char *name,
 588                           void *buffer, size_t size)
 589 {
 590         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 591         struct gfs2_ea_location el;
 592         int type = handler->flags;
 593         int error;
 594
 595         if (!ip->i_eattr)
 596                 return -ENODATA;
 597         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 598                 return -EINVAL;
 599
 600         error = gfs2_ea_find(ip, type, name, &el);
 601         if (error)
 602                 return error;
 603         if (!el.el_ea)
 604                 return -ENODATA;
 605         if (size)
 606                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 607         else
 608                 error = GFS2_EA_DATA_LEN(el.el_ea);
 609         brelse(el.el_bh);
 610
 611         return error;
 612 }
 613
 614 /**
 615  * ea_alloc_blk - allocates a new block for extended attributes.
 616  * @ip: A pointer to the inode that's getting extended attributes
 617  * @bhp: Pointer to pointer to a struct buffer_head
 618  *
 619  * Returns: errno
 620  */
 621
 622 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 623 {
 624         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 625         struct gfs2_ea_header *ea;
 626         unsigned int n = 1;
 627         u64 block;
 628         int error;
 629
 630         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 631         if (error)
 632                 return error;
 633         gfs2_trans_add_unrevoke(sdp, block, 1);
 634         *bhp = gfs2_meta_new(ip->i_gl, block);
 635         gfs2_trans_add_meta(ip->i_gl, *bhp);
 636         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 637         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 638
 639         ea = GFS2_EA_BH2FIRST(*bhp);
 640         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 641         ea->ea_type = GFS2_EATYPE_UNUSED;
 642         ea->ea_flags = GFS2_EAFLAG_LAST;
 643         ea->ea_num_ptrs = 0;
 644
 645         gfs2_add_inode_blocks(&ip->i_inode, 1);
 646
 647         return 0;
 648 }
 649
 650 /**
 651  * ea_write - writes the request info to an ea, creating new blocks if
 652  *            necessary
 653  * @ip: inode that is being modified
 654  * @ea: the location of the new ea in a block
 655  * @er: the write request
 656  *
 657  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 658  *
 659  * returns : errno
 660  */
 661
 662 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 663                     struct gfs2_ea_request *er)
 664 {
 665         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 666         int error;
 667
 668         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 669         ea->ea_name_len = er->er_name_len;
 670         ea->ea_type = er->er_type;
 671         ea->__pad = 0;
 672
 673         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 674
 675         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 676                 ea->ea_num_ptrs = 0;
 677                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 678         } else {
 679                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 680                 const char *data = er->er_data;
 681                 unsigned int data_len = er->er_data_len;
 682                 unsigned int copy;
 683                 unsigned int x;
 684
 685                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 686                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 687                         struct buffer_head *bh;
 688                         u64 block;
 689                         int mh_size = sizeof(struct gfs2_meta_header);
 690                         unsigned int n = 1;
 691
 692                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 693                         if (error)
 694                                 return error;
 695                         gfs2_trans_add_unrevoke(sdp, block, 1);
 696                         bh = gfs2_meta_new(ip->i_gl, block);
 697                         gfs2_trans_add_meta(ip->i_gl, bh);
 698                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 699
 700                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 701
 702                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 703                                                            data_len;
 704                         memcpy(bh->b_data + mh_size, data, copy);
 705                         if (copy < sdp->sd_jbsize)
 706                                 memset(bh->b_data + mh_size + copy, 0,
 707                                        sdp->sd_jbsize - copy);
 708
 709                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 710                         data += copy;
 711                         data_len -= copy;
 712
 713                         brelse(bh);
 714                 }
 715
 716                 gfs2_assert_withdraw(sdp, !data_len);
 717         }
 718
 719         return 0;
 720 }
 721
 722 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 723                                    struct gfs2_ea_request *er, void *private);
 724
 725 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 726                              unsigned int blks,
 727                              ea_skeleton_call_t skeleton_call, void *private)
 728 {
 729         struct gfs2_alloc_parms ap = { .target = blks };
 730         struct buffer_head *dibh;
 731         int error;
 732
 733         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 734         if (error)
 735                 return error;
 736
 737         error = gfs2_quota_lock_check(ip, &ap);
 738         if (error)
 739                 return error;
 740
 741         error = gfs2_inplace_reserve(ip, &ap);
 742         if (error)
 743                 goto out_gunlock_q;
 744
 745         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 746                                  blks + gfs2_rg_blocks(ip, blks) +
 747                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 748         if (error)
 749                 goto out_ipres;
 750
 751         error = skeleton_call(ip, er, private);
 752         if (error)
 753                 goto out_end_trans;
 754
 755         error = gfs2_meta_inode_buffer(ip, &dibh);
 756         if (!error) {
 757                 ip->i_inode.i_ctime = CURRENT_TIME;
 758                 gfs2_trans_add_meta(ip->i_gl, dibh);
 759                 gfs2_dinode_out(ip, dibh->b_data);
 760                 brelse(dibh);
 761         }
 762
 763 out_end_trans:
 764         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 765 out_ipres:
 766         gfs2_inplace_release(ip);
 767 out_gunlock_q:
 768         gfs2_quota_unlock(ip);
 769         return error;
 770 }
 771
 772 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 773                      void *private)
 774 {
 775         struct buffer_head *bh;
 776         int error;
 777
 778         error = ea_alloc_blk(ip, &bh);
 779         if (error)
 780                 return error;
 781
 782         ip->i_eattr = bh->b_blocknr;
 783         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 784
 785         brelse(bh);
 786
 787         return error;
 788 }
 789
 790 /**
 791  * ea_init - initializes a new eattr block
 792  * @ip:
 793  * @er:
 794  *
 795  * Returns: errno
 796  */
 797
 798 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 799                    const void *data, size_t size)
 800 {
 801         struct gfs2_ea_request er;
 802         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 803         unsigned int blks = 1;
 804
 805         er.er_type = type;
 806         er.er_name = name;
 807         er.er_name_len = strlen(name);
 808         er.er_data = (void *)data;
 809         er.er_data_len = size;
 810
 811         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 812                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 813
 814         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 815 }
 816
 817 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 818 {
 819         u32 ea_size = GFS2_EA_SIZE(ea);
 820         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 821                                      ea_size);
 822         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 823         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 824
 825         ea->ea_rec_len = cpu_to_be32(ea_size);
 826         ea->ea_flags ^= last;
 827
 828         new->ea_rec_len = cpu_to_be32(new_size);
 829         new->ea_flags = last;
 830
 831         return new;
 832 }
 833
 834 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 835                                   struct gfs2_ea_location *el)
 836 {
 837         struct gfs2_ea_header *ea = el->el_ea;
 838         struct gfs2_ea_header *prev = el->el_prev;
 839         u32 len;
 840
 841         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 842
 843         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 844                 ea->ea_type = GFS2_EATYPE_UNUSED;
 845                 return;
 846         } else if (GFS2_EA2NEXT(prev) != ea) {
 847                 prev = GFS2_EA2NEXT(prev);
 848                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 849         }
 850
 851         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 852         prev->ea_rec_len = cpu_to_be32(len);
 853
 854         if (GFS2_EA_IS_LAST(ea))
 855                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 856 }
 857
 858 struct ea_set {
 859         int ea_split;
 860
 861         struct gfs2_ea_request *es_er;
 862         struct gfs2_ea_location *es_el;
 863
 864         struct buffer_head *es_bh;
 865         struct gfs2_ea_header *es_ea;
 866 };
 867
 868 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 869                                  struct gfs2_ea_header *ea, struct ea_set *es)
 870 {
 871         struct gfs2_ea_request *er = es->es_er;
 872         struct buffer_head *dibh;
 873         int error;
 874
 875         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 876         if (error)
 877                 return error;
 878
 879         gfs2_trans_add_meta(ip->i_gl, bh);
 880
 881         if (es->ea_split)
 882                 ea = ea_split_ea(ea);
 883
 884         ea_write(ip, ea, er);
 885
 886         if (es->es_el)
 887                 ea_set_remove_stuffed(ip, es->es_el);
 888
 889         error = gfs2_meta_inode_buffer(ip, &dibh);
 890         if (error)
 891                 goto out;
 892         ip->i_inode.i_ctime = CURRENT_TIME;
 893         gfs2_trans_add_meta(ip->i_gl, dibh);
 894         gfs2_dinode_out(ip, dibh->b_data);
 895         brelse(dibh);
 896 out:
 897         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 898         return error;
 899 }
 900
 901 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 902                                struct gfs2_ea_request *er, void *private)
 903 {
 904         struct ea_set *es = private;
 905         struct gfs2_ea_header *ea = es->es_ea;
 906         int error;
 907
 908         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 909
 910         if (es->ea_split)
 911                 ea = ea_split_ea(ea);
 912
 913         error = ea_write(ip, ea, er);
 914         if (error)
 915                 return error;
 916
 917         if (es->es_el)
 918                 ea_set_remove_stuffed(ip, es->es_el);
 919
 920         return 0;
 921 }
 922
 923 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 924                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 925                          void *private)
 926 {
 927         struct ea_set *es = private;
 928         unsigned int size;
 929         int stuffed;
 930         int error;
 931
 932         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 933                                es->es_er->er_data_len, &size);
 934
 935         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 936                 if (GFS2_EA_REC_LEN(ea) < size)
 937                         return 0;
 938                 if (!GFS2_EA_IS_STUFFED(ea)) {
 939                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 940                         if (error)
 941                                 return error;
 942                 }
 943                 es->ea_split = 0;
 944         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 945                 es->ea_split = 1;
 946         else
 947                 return 0;
 948
 949         if (stuffed) {
 950                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 951                 if (error)
 952                         return error;
 953         } else {
 954                 unsigned int blks;
 955
 956                 es->es_bh = bh;
 957                 es->es_ea = ea;
 958                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 959                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 960
 961                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 962                                           ea_set_simple_alloc, es);
 963                 if (error)
 964                         return error;
 965         }
 966
 967         return 1;
 968 }
 969
 970 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 971                         void *private)
 972 {
 973         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 974         struct buffer_head *indbh, *newbh;
 975         __be64 *eablk;
 976         int error;
 977         int mh_size = sizeof(struct gfs2_meta_header);
 978
 979         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 980                 __be64 *end;
 981
 982                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 983                                        &indbh);
 984                 if (error)
 985                         return error;
 986
 987                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 988                         error = -EIO;
 989                         goto out;
 990                 }
 991
 992                 eablk = (__be64 *)(indbh->b_data + mh_size);
 993                 end = eablk + sdp->sd_inptrs;
 994
 995                 for (; eablk < end; eablk++)
 996                         if (!*eablk)
 997                                 break;
 998
 999                 if (eablk == end) {
1000                         error = -ENOSPC;
1001                         goto out;
1002                 }
1003
1004                 gfs2_trans_add_meta(ip->i_gl, indbh);
1005         } else {
1006                 u64 blk;
1007                 unsigned int n = 1;
1008                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1009                 if (error)
1010                         return error;
1011                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1012                 indbh = gfs2_meta_new(ip->i_gl, blk);
1013                 gfs2_trans_add_meta(ip->i_gl, indbh);
1014                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1015                 gfs2_buffer_clear_tail(indbh, mh_size);
1016
1017                 eablk = (__be64 *)(indbh->b_data + mh_size);
1018                 *eablk = cpu_to_be64(ip->i_eattr);
1019                 ip->i_eattr = blk;
1020                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1021                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1022
1023                 eablk++;
1024         }
1025
1026         error = ea_alloc_blk(ip, &newbh);
1027         if (error)
1028                 goto out;
1029
1030         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1031         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1032         brelse(newbh);
1033         if (error)
1034                 goto out;
1035
1036         if (private)
1037                 ea_set_remove_stuffed(ip, private);
1038
1039 out:
1040         brelse(indbh);
1041         return error;
1042 }
1043
1044 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1045                     const void *value, size_t size, struct gfs2_ea_location *el)
1046 {
1047         struct gfs2_ea_request er;
1048         struct ea_set es;
1049         unsigned int blks = 2;
1050         int error;
1051
1052         er.er_type = type;
1053         er.er_name = name;
1054         er.er_data = (void *)value;
1055         er.er_name_len = strlen(name);
1056         er.er_data_len = size;
1057
1058         memset(&es, 0, sizeof(struct ea_set));
1059         es.es_er = &er;
1060         es.es_el = el;
1061
1062         error = ea_foreach(ip, ea_set_simple, &es);
1063         if (error > 0)
1064                 return 0;
1065         if (error)
1066                 return error;
1067
1068         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1069                 blks++;
1070         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1071                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1072
1073         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1074 }
1075
1076 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1077                                    struct gfs2_ea_location *el)
1078 {
1079         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1080                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1081                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1082                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1083         }
1084
1085         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1086 }
1087
1088 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1089 {
1090         struct gfs2_ea_header *ea = el->el_ea;
1091         struct gfs2_ea_header *prev = el->el_prev;
1092         struct buffer_head *dibh;
1093         int error;
1094
1095         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1096         if (error)
1097                 return error;
1098
1099         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1100
1101         if (prev) {
1102                 u32 len;
1103
1104                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1105                 prev->ea_rec_len = cpu_to_be32(len);
1106
1107                 if (GFS2_EA_IS_LAST(ea))
1108                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1109         } else {
1110                 ea->ea_type = GFS2_EATYPE_UNUSED;
1111         }
1112
1113         error = gfs2_meta_inode_buffer(ip, &dibh);
1114         if (!error) {
1115                 ip->i_inode.i_ctime = CURRENT_TIME;
1116                 gfs2_trans_add_meta(ip->i_gl, dibh);
1117                 gfs2_dinode_out(ip, dibh->b_data);
1118                 brelse(dibh);
1119         }
1120
1121         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1122
1123         return error;
1124 }
1125
1126 /**
1127  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1128  * @ip: The inode
1129  * @type: The type of the extended attribute
1130  * @name: The name of the extended attribute
1131  *
1132  * This is not called directly by the VFS since we use the (common)
1133  * scheme of making a "set with NULL data" mean a remove request. Note
1134  * that this is different from a set with zero length data.
1135  *
1136  * Returns: 0, or errno on failure
1137  */
1138
1139 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1140 {
1141         struct gfs2_ea_location el;
1142         int error;
1143
1144         if (!ip->i_eattr)
1145                 return -ENODATA;
1146
1147         error = gfs2_ea_find(ip, type, name, &el);
1148         if (error)
1149                 return error;
1150         if (!el.el_ea)
1151                 return -ENODATA;
1152
1153         if (GFS2_EA_IS_STUFFED(el.el_ea))
1154                 error = ea_remove_stuffed(ip, &el);
1155         else
1156                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1157
1158         brelse(el.el_bh);
1159
1160         return error;
1161 }
1162
1163 /**
1164  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1165  * @ip: The inode
1166  * @name: The name of the extended attribute
1167  * @value: The value of the extended attribute (NULL for remove)
1168  * @size: The size of the @value argument
1169  * @flags: Create or Replace
1170  * @type: The type of the extended attribute
1171  *
1172  * See gfs2_xattr_remove() for details of the removal of xattrs.
1173  *
1174  * Returns: 0 or errno on failure
1175  */
1176
1177 int __gfs2_xattr_set(struct inode *inode, const char *name,
1178                    const void *value, size_t size, int flags, int type)
1179 {
1180         struct gfs2_inode *ip = GFS2_I(inode);
1181         struct gfs2_sbd *sdp = GFS2_SB(inode);
1182         struct gfs2_ea_location el;
1183         unsigned int namel = strlen(name);
1184         int error;
1185
1186         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1187                 return -EPERM;
1188         if (namel > GFS2_EA_MAX_NAME_LEN)
1189                 return -ERANGE;
1190
1191         if (value == NULL)
1192                 return gfs2_xattr_remove(ip, type, name);
1193
1194         if (ea_check_size(sdp, namel, size))
1195                 return -ERANGE;
1196
1197         if (!ip->i_eattr) {
1198                 if (flags & XATTR_REPLACE)
1199                         return -ENODATA;
1200                 return ea_init(ip, type, name, value, size);
1201         }
1202
1203         error = gfs2_ea_find(ip, type, name, &el);
1204         if (error)
1205                 return error;
1206
1207         if (el.el_ea) {
1208                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1209                         brelse(el.el_bh);
1210                         return -EPERM;
1211                 }
1212
1213                 error = -EEXIST;
1214                 if (!(flags & XATTR_CREATE)) {
1215                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1216                         error = ea_set_i(ip, type, name, value, size, &el);
1217                         if (!error && unstuffed)
1218                                 ea_set_remove_unstuffed(ip, &el);
1219                 }
1220
1221                 brelse(el.el_bh);
1222                 return error;
1223         }
1224
1225         error = -ENODATA;
1226         if (!(flags & XATTR_REPLACE))
1227                 error = ea_set_i(ip, type, name, value, size, NULL);
1228
1229         return error;
1230 }
1231
1232 static int gfs2_xattr_set(const struct xattr_handler *handler,
1233                           struct dentry *dentry, const char *name,
1234                           const void *value, size_t size, int flags)
1235 {
1236         return __gfs2_xattr_set(d_inode(dentry), name, value,
1237                                 size, flags, handler->flags);
1238 }
1239
1240
1241 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1242                                   struct gfs2_ea_header *ea, char *data)
1243 {
1244         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1245         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1246         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1247         int ret;
1248
1249         ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1250         if (ret)
1251                 return ret;
1252
1253         ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1254         gfs2_trans_end(sdp);
1255
1256         return ret;
1257 }
1258
1259 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1260 {
1261         struct inode *inode = &ip->i_inode;
1262         struct gfs2_sbd *sdp = GFS2_SB(inode);
1263         struct gfs2_ea_location el;
1264         int error;
1265
1266         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1267         if (error)
1268                 return error;
1269
1270         if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1271                 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1272                 if (error == 0) {
1273                         gfs2_trans_add_meta(ip->i_gl, el.el_bh);
1274                         memcpy(GFS2_EA2DATA(el.el_ea), data,
1275                                GFS2_EA_DATA_LEN(el.el_ea));
1276                 }
1277         } else {
1278                 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1279         }
1280
1281         brelse(el.el_bh);
1282         if (error)
1283                 return error;
1284
1285         error = gfs2_setattr_simple(inode, attr);
1286         gfs2_trans_end(sdp);
1287         return error;
1288 }
1289
1290 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1291 {
1292         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1293         struct gfs2_rgrp_list rlist;
1294         struct buffer_head *indbh, *dibh;
1295         __be64 *eablk, *end;
1296         unsigned int rg_blocks = 0;
1297         u64 bstart = 0;
1298         unsigned int blen = 0;
1299         unsigned int blks = 0;
1300         unsigned int x;
1301         int error;
1302
1303         error = gfs2_rindex_update(sdp);
1304         if (error)
1305                 return error;
1306
1307         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1308
1309         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1310         if (error)
1311                 return error;
1312
1313         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1314                 error = -EIO;
1315                 goto out;
1316         }
1317
1318         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1319         end = eablk + sdp->sd_inptrs;
1320
1321         for (; eablk < end; eablk++) {
1322                 u64 bn;
1323
1324                 if (!*eablk)
1325                         break;
1326                 bn = be64_to_cpu(*eablk);
1327
1328                 if (bstart + blen == bn)
1329                         blen++;
1330                 else {
1331                         if (bstart)
1332                                 gfs2_rlist_add(ip, &rlist, bstart);
1333                         bstart = bn;
1334                         blen = 1;
1335                 }
1336                 blks++;
1337         }
1338         if (bstart)
1339                 gfs2_rlist_add(ip, &rlist, bstart);
1340         else
1341                 goto out;
1342
1343         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1344
1345         for (x = 0; x < rlist.rl_rgrps; x++) {
1346                 struct gfs2_rgrpd *rgd;
1347                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1348                 rg_blocks += rgd->rd_length;
1349         }
1350
1351         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1352         if (error)
1353                 goto out_rlist_free;
1354
1355         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1356                                  RES_STATFS + RES_QUOTA, blks);
1357         if (error)
1358                 goto out_gunlock;
1359
1360         gfs2_trans_add_meta(ip->i_gl, indbh);
1361
1362         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1363         bstart = 0;
1364         blen = 0;
1365
1366         for (; eablk < end; eablk++) {
1367                 u64 bn;
1368
1369                 if (!*eablk)
1370                         break;
1371                 bn = be64_to_cpu(*eablk);
1372
1373                 if (bstart + blen == bn)
1374                         blen++;
1375                 else {
1376                         if (bstart)
1377                                 gfs2_free_meta(ip, bstart, blen);
1378                         bstart = bn;
1379                         blen = 1;
1380                 }
1381
1382                 *eablk = 0;
1383                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1384         }
1385         if (bstart)
1386                 gfs2_free_meta(ip, bstart, blen);
1387
1388         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1389
1390         error = gfs2_meta_inode_buffer(ip, &dibh);
1391         if (!error) {
1392                 gfs2_trans_add_meta(ip->i_gl, dibh);
1393                 gfs2_dinode_out(ip, dibh->b_data);
1394                 brelse(dibh);
1395         }
1396
1397         gfs2_trans_end(sdp);
1398
1399 out_gunlock:
1400         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1401 out_rlist_free:
1402         gfs2_rlist_free(&rlist);
1403 out:
1404         brelse(indbh);
1405         return error;
1406 }
1407
1408 static int ea_dealloc_block(struct gfs2_inode *ip)
1409 {
1410         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1411         struct gfs2_rgrpd *rgd;
1412         struct buffer_head *dibh;
1413         struct gfs2_holder gh;
1414         int error;
1415
1416         error = gfs2_rindex_update(sdp);
1417         if (error)
1418                 return error;
1419
1420         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1421         if (!rgd) {
1422                 gfs2_consist_inode(ip);
1423                 return -EIO;
1424         }
1425
1426         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1427         if (error)
1428                 return error;
1429
1430         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1431                                  RES_QUOTA, 1);
1432         if (error)
1433                 goto out_gunlock;
1434
1435         gfs2_free_meta(ip, ip->i_eattr, 1);
1436
1437         ip->i_eattr = 0;
1438         gfs2_add_inode_blocks(&ip->i_inode, -1);
1439
1440         error = gfs2_meta_inode_buffer(ip, &dibh);
1441         if (!error) {
1442                 gfs2_trans_add_meta(ip->i_gl, dibh);
1443                 gfs2_dinode_out(ip, dibh->b_data);
1444                 brelse(dibh);
1445         }
1446
1447         gfs2_trans_end(sdp);
1448
1449 out_gunlock:
1450         gfs2_glock_dq_uninit(&gh);
1451         return error;
1452 }
1453
1454 /**
1455  * gfs2_ea_dealloc - deallocate the extended attribute fork
1456  * @ip: the inode
1457  *
1458  * Returns: errno
1459  */
1460
1461 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1462 {
1463         int error;
1464
1465         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1466         if (error)
1467                 return error;
1468
1469         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1470         if (error)
1471                 return error;
1472
1473         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1474         if (error)
1475                 goto out_quota;
1476
1477         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1478                 error = ea_dealloc_indirect(ip);
1479                 if (error)
1480                         goto out_quota;
1481         }
1482
1483         error = ea_dealloc_block(ip);
1484
1485 out_quota:
1486         gfs2_quota_unhold(ip);
1487         return error;
1488 }
1489
1490 static const struct xattr_handler gfs2_xattr_user_handler = {
1491         .prefix = XATTR_USER_PREFIX,
1492         .flags  = GFS2_EATYPE_USR,
1493         .get    = gfs2_xattr_get,
1494         .set    = gfs2_xattr_set,
1495 };
1496
1497 static const struct xattr_handler gfs2_xattr_security_handler = {
1498         .prefix = XATTR_SECURITY_PREFIX,
1499         .flags  = GFS2_EATYPE_SECURITY,
1500         .get    = gfs2_xattr_get,
1501         .set    = gfs2_xattr_set,
1502 };
1503
1504 const struct xattr_handler *gfs2_xattr_handlers[] = {
1505         &gfs2_xattr_user_handler,
1506         &gfs2_xattr_security_handler,
1507         &posix_acl_access_xattr_handler,
1508         &posix_acl_default_xattr_handler,
1509         NULL,
1510 };
1511