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 <linux/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 "super.h"
  29 #include "trans.h"
  30 #include "util.h"
  31
  32 /**
  33  * ea_calc_size - returns the acutal number of bytes the request will take up
  34  *                (not counting any unstuffed data blocks)
  35  * @sdp:
  36  * @er:
  37  * @size:
  38  *
  39  * Returns: 1 if the EA should be stuffed
  40  */
  41
  42 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  43                         unsigned int *size)
  44 {
  45         unsigned int jbsize = sdp->sd_jbsize;
  46
  47         /* Stuffed */
  48         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  49
  50         if (*size <= jbsize)
  51                 return 1;
  52
  53         /* Unstuffed */
  54         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  55                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  56
  57         return 0;
  58 }
  59
  60 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  61 {
  62         unsigned int size;
  63
  64         if (dsize > GFS2_EA_MAX_DATA_LEN)
  65                 return -ERANGE;
  66
  67         ea_calc_size(sdp, nsize, dsize, &size);
  68
  69         /* This can only happen with 512 byte blocks */
  70         if (size > sdp->sd_jbsize)
  71                 return -ERANGE;
  72
  73         return 0;
  74 }
  75
  76 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  77                           struct gfs2_ea_header *ea,
  78                           struct gfs2_ea_header *prev, void *private);
  79
  80 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  81                         ea_call_t ea_call, void *data)
  82 {
  83         struct gfs2_ea_header *ea, *prev = NULL;
  84         int error = 0;
  85
  86         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  87                 return -EIO;
  88
  89         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  90                 if (!GFS2_EA_REC_LEN(ea))
  91                         goto fail;
  92                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  93                                                   bh->b_data + bh->b_size))
  94                         goto fail;
  95                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  96                         goto fail;
  97
  98                 error = ea_call(ip, bh, ea, prev, data);
  99                 if (error)
 100                         return error;
 101
 102                 if (GFS2_EA_IS_LAST(ea)) {
 103                         if ((char *)GFS2_EA2NEXT(ea) !=
 104                             bh->b_data + bh->b_size)
 105                                 goto fail;
 106                         break;
 107                 }
 108         }
 109
 110         return error;
 111
 112 fail:
 113         gfs2_consist_inode(ip);
 114         return -EIO;
 115 }
 116
 117 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 118 {
 119         struct buffer_head *bh, *eabh;
 120         __be64 *eablk, *end;
 121         int error;
 122
 123         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
 124         if (error)
 125                 return error;
 126
 127         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 128                 error = ea_foreach_i(ip, bh, ea_call, data);
 129                 goto out;
 130         }
 131
 132         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 133                 error = -EIO;
 134                 goto out;
 135         }
 136
 137         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 138         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 139
 140         for (; eablk < end; eablk++) {
 141                 u64 bn;
 142
 143                 if (!*eablk)
 144                         break;
 145                 bn = be64_to_cpu(*eablk);
 146
 147                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
 148                 if (error)
 149                         break;
 150                 error = ea_foreach_i(ip, eabh, ea_call, data);
 151                 brelse(eabh);
 152                 if (error)
 153                         break;
 154         }
 155 out:
 156         brelse(bh);
 157         return error;
 158 }
 159
 160 struct ea_find {
 161         int type;
 162         const char *name;
 163         size_t namel;
 164         struct gfs2_ea_location *ef_el;
 165 };
 166
 167 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 168                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 169                      void *private)
 170 {
 171         struct ea_find *ef = private;
 172
 173         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 174                 return 0;
 175
 176         if (ea->ea_type == ef->type) {
 177                 if (ea->ea_name_len == ef->namel &&
 178                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 179                         struct gfs2_ea_location *el = ef->ef_el;
 180                         get_bh(bh);
 181                         el->el_bh = bh;
 182                         el->el_ea = ea;
 183                         el->el_prev = prev;
 184                         return 1;
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 192                         struct gfs2_ea_location *el)
 193 {
 194         struct ea_find ef;
 195         int error;
 196
 197         ef.type = type;
 198         ef.name = name;
 199         ef.namel = strlen(name);
 200         ef.ef_el = el;
 201
 202         memset(el, 0, sizeof(struct gfs2_ea_location));
 203
 204         error = ea_foreach(ip, ea_find_i, &ef);
 205         if (error > 0)
 206                 return 0;
 207
 208         return error;
 209 }
 210
 211 /**
 212  * ea_dealloc_unstuffed -
 213  * @ip:
 214  * @bh:
 215  * @ea:
 216  * @prev:
 217  * @private:
 218  *
 219  * Take advantage of the fact that all unstuffed blocks are
 220  * allocated from the same RG.  But watch, this may not always
 221  * be true.
 222  *
 223  * Returns: errno
 224  */
 225
 226 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 227                                 struct gfs2_ea_header *ea,
 228                                 struct gfs2_ea_header *prev, void *private)
 229 {
 230         int *leave = private;
 231         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 232         struct gfs2_rgrpd *rgd;
 233         struct gfs2_holder rg_gh;
 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, rgd, 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, rgd, 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         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 311         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
 312
 313         gfs2_trans_end(sdp);
 314
 315 out_gunlock:
 316         gfs2_glock_dq_uninit(&rg_gh);
 317         return error;
 318 }
 319
 320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 321                                struct gfs2_ea_header *ea,
 322                                struct gfs2_ea_header *prev, int leave)
 323 {
 324         int error;
 325
 326         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 327         if (error)
 328                 return error;
 329
 330         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 331         if (error)
 332                 goto out_alloc;
 333
 334         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 335
 336         gfs2_quota_unhold(ip);
 337 out_alloc:
 338         return error;
 339 }
 340
 341 struct ea_list {
 342         struct gfs2_ea_request *ei_er;
 343         unsigned int ei_size;
 344 };
 345
 346 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 347                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 348                      void *private)
 349 {
 350         struct ea_list *ei = private;
 351         struct gfs2_ea_request *er = ei->ei_er;
 352         unsigned int ea_size;
 353         char *prefix;
 354         unsigned int l;
 355
 356         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 357                 return 0;
 358
 359         switch (ea->ea_type) {
 360         case GFS2_EATYPE_USR:
 361                 prefix = "user.";
 362                 l = 5;
 363                 break;
 364         case GFS2_EATYPE_SYS:
 365                 prefix = "system.";
 366                 l = 7;
 367                 break;
 368         case GFS2_EATYPE_SECURITY:
 369                 prefix = "security.";
 370                 l = 9;
 371                 break;
 372         default:
 373                 BUG();
 374         }
 375
 376         ea_size = l + ea->ea_name_len + 1;
 377         if (er->er_data_len) {
 378                 if (ei->ei_size + ea_size > er->er_data_len)
 379                         return -ERANGE;
 380
 381                 memcpy(er->er_data + ei->ei_size, prefix, l);
 382                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 383                        ea->ea_name_len);
 384                 er->er_data[ei->ei_size + ea_size - 1] = 0;
 385         }
 386
 387         ei->ei_size += ea_size;
 388
 389         return 0;
 390 }
 391
 392 /**
 393  * gfs2_listxattr - List gfs2 extended attributes
 394  * @dentry: The dentry whose inode we are interested in
 395  * @buffer: The buffer to write the results
 396  * @size: The size of the buffer
 397  *
 398  * Returns: actual size of data on success, -errno on error
 399  */
 400
 401 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 402 {
 403         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 404         struct gfs2_ea_request er;
 405         struct gfs2_holder i_gh;
 406         int error;
 407
 408         memset(&er, 0, sizeof(struct gfs2_ea_request));
 409         if (size) {
 410                 er.er_data = buffer;
 411                 er.er_data_len = size;
 412         }
 413
 414         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 415         if (error)
 416                 return error;
 417
 418         if (ip->i_eattr) {
 419                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 420
 421                 error = ea_foreach(ip, ea_list_i, &ei);
 422                 if (!error)
 423                         error = ei.ei_size;
 424         }
 425
 426         gfs2_glock_dq_uninit(&i_gh);
 427
 428         return error;
 429 }
 430
 431 /**
 432  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 433  *                     request buffer
 434  * @ip: The GFS2 inode
 435  * @ea: The extended attribute header structure
 436  * @din: The data to be copied in
 437  * @dout: The data to be copied out (one of din,dout will be NULL)
 438  *
 439  * Returns: errno
 440  */
 441
 442 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 443                                const char *din, char *dout)
 444 {
 445         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 446         struct buffer_head **bh;
 447         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 448         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 449         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 450         unsigned int x;
 451         int error = 0;
 452         unsigned char *pos;
 453         unsigned cp_size;
 454
 455         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 456         if (!bh)
 457                 return -ENOMEM;
 458
 459         for (x = 0; x < nptrs; x++) {
 460                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
 461                                        bh + x);
 462                 if (error) {
 463                         while (x--)
 464                                 brelse(bh[x]);
 465                         goto out;
 466                 }
 467                 dataptrs++;
 468         }
 469
 470         for (x = 0; x < nptrs; x++) {
 471                 error = gfs2_meta_wait(sdp, bh[x]);
 472                 if (error) {
 473                         for (; x < nptrs; x++)
 474                                 brelse(bh[x]);
 475                         goto out;
 476                 }
 477                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 478                         for (; x < nptrs; x++)
 479                                 brelse(bh[x]);
 480                         error = -EIO;
 481                         goto out;
 482                 }
 483
 484                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 485                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 486
 487                 if (dout) {
 488                         memcpy(dout, pos, cp_size);
 489                         dout += sdp->sd_jbsize;
 490                 }
 491
 492                 if (din) {
 493                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 494                         memcpy(pos, din, cp_size);
 495                         din += sdp->sd_jbsize;
 496                 }
 497
 498                 amount -= sdp->sd_jbsize;
 499                 brelse(bh[x]);
 500         }
 501
 502 out:
 503         kfree(bh);
 504         return error;
 505 }
 506
 507 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 508                             char *data, size_t size)
 509 {
 510         int ret;
 511         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 512         if (len > size)
 513                 return -ERANGE;
 514
 515         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 516                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 517                 return len;
 518         }
 519         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 520         if (ret < 0)
 521                 return ret;
 522         return len;
 523 }
 524
 525 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 526 {
 527         struct gfs2_ea_location el;
 528         int error;
 529         int len;
 530         char *data;
 531
 532         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 533         if (error)
 534                 return error;
 535         if (!el.el_ea)
 536                 goto out;
 537         if (!GFS2_EA_DATA_LEN(el.el_ea))
 538                 goto out;
 539
 540         len = GFS2_EA_DATA_LEN(el.el_ea);
 541         data = kmalloc(len, GFP_NOFS);
 542         error = -ENOMEM;
 543         if (data == NULL)
 544                 goto out;
 545
 546         error = gfs2_ea_get_copy(ip, &el, data, len);
 547         if (error < 0)
 548                 kfree(data);
 549         else
 550                 *ppdata = data;
 551 out:
 552         brelse(el.el_bh);
 553         return error;
 554 }
 555
 556 /**
 557  * gfs2_xattr_get - Get a GFS2 extended attribute
 558  * @inode: The inode
 559  * @name: The name of the extended attribute
 560  * @buffer: The buffer to write the result into
 561  * @size: The size of the buffer
 562  * @type: The type of extended attribute
 563  *
 564  * Returns: actual size of data on success, -errno on error
 565  */
 566 static int __gfs2_xattr_get(struct inode *inode, const char *name,
 567                             void *buffer, size_t size, int type)
 568 {
 569         struct gfs2_inode *ip = GFS2_I(inode);
 570         struct gfs2_ea_location el;
 571         int error;
 572
 573         if (!ip->i_eattr)
 574                 return -ENODATA;
 575         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 576                 return -EINVAL;
 577
 578         error = gfs2_ea_find(ip, type, name, &el);
 579         if (error)
 580                 return error;
 581         if (!el.el_ea)
 582                 return -ENODATA;
 583         if (size)
 584                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 585         else
 586                 error = GFS2_EA_DATA_LEN(el.el_ea);
 587         brelse(el.el_bh);
 588
 589         return error;
 590 }
 591
 592 static int gfs2_xattr_get(const struct xattr_handler *handler,
 593                           struct dentry *unused, struct inode *inode,
 594                           const char *name, void *buffer, size_t size)
 595 {
 596         struct gfs2_inode *ip = GFS2_I(inode);
 597         struct gfs2_holder gh;
 598         int ret;
 599
 600         /* During lookup, SELinux calls this function with the glock locked. */
 601
 602         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 603                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 604                 if (ret)
 605                         return ret;
 606         } else {
 607                 gfs2_holder_mark_uninitialized(&gh);
 608         }
 609         ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
 610         if (gfs2_holder_initialized(&gh))
 611                 gfs2_glock_dq_uninit(&gh);
 612         return ret;
 613 }
 614
 615 /**
 616  * ea_alloc_blk - allocates a new block for extended attributes.
 617  * @ip: A pointer to the inode that's getting extended attributes
 618  * @bhp: Pointer to pointer to a struct buffer_head
 619  *
 620  * Returns: errno
 621  */
 622
 623 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 624 {
 625         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 626         struct gfs2_ea_header *ea;
 627         unsigned int n = 1;
 628         u64 block;
 629         int error;
 630
 631         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 632         if (error)
 633                 return error;
 634         gfs2_trans_remove_revoke(sdp, block, 1);
 635         *bhp = gfs2_meta_new(ip->i_gl, block);
 636         gfs2_trans_add_meta(ip->i_gl, *bhp);
 637         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 638         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 639
 640         ea = GFS2_EA_BH2FIRST(*bhp);
 641         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 642         ea->ea_type = GFS2_EATYPE_UNUSED;
 643         ea->ea_flags = GFS2_EAFLAG_LAST;
 644         ea->ea_num_ptrs = 0;
 645
 646         gfs2_add_inode_blocks(&ip->i_inode, 1);
 647
 648         return 0;
 649 }
 650
 651 /**
 652  * ea_write - writes the request info to an ea, creating new blocks if
 653  *            necessary
 654  * @ip: inode that is being modified
 655  * @ea: the location of the new ea in a block
 656  * @er: the write request
 657  *
 658  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 659  *
 660  * returns : errno
 661  */
 662
 663 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 664                     struct gfs2_ea_request *er)
 665 {
 666         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 667         int error;
 668
 669         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 670         ea->ea_name_len = er->er_name_len;
 671         ea->ea_type = er->er_type;
 672         ea->__pad = 0;
 673
 674         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 675
 676         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 677                 ea->ea_num_ptrs = 0;
 678                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 679         } else {
 680                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 681                 const char *data = er->er_data;
 682                 unsigned int data_len = er->er_data_len;
 683                 unsigned int copy;
 684                 unsigned int x;
 685
 686                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 687                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 688                         struct buffer_head *bh;
 689                         u64 block;
 690                         int mh_size = sizeof(struct gfs2_meta_header);
 691                         unsigned int n = 1;
 692
 693                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 694                         if (error)
 695                                 return error;
 696                         gfs2_trans_remove_revoke(sdp, block, 1);
 697                         bh = gfs2_meta_new(ip->i_gl, block);
 698                         gfs2_trans_add_meta(ip->i_gl, bh);
 699                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 700
 701                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 702
 703                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 704                                                            data_len;
 705                         memcpy(bh->b_data + mh_size, data, copy);
 706                         if (copy < sdp->sd_jbsize)
 707                                 memset(bh->b_data + mh_size + copy, 0,
 708                                        sdp->sd_jbsize - copy);
 709
 710                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 711                         data += copy;
 712                         data_len -= copy;
 713
 714                         brelse(bh);
 715                 }
 716
 717                 gfs2_assert_withdraw(sdp, !data_len);
 718         }
 719
 720         return 0;
 721 }
 722
 723 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 724                                    struct gfs2_ea_request *er, void *private);
 725
 726 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 727                              unsigned int blks,
 728                              ea_skeleton_call_t skeleton_call, void *private)
 729 {
 730         struct gfs2_alloc_parms ap = { .target = blks };
 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         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 756         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
 757
 758 out_end_trans:
 759         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 760 out_ipres:
 761         gfs2_inplace_release(ip);
 762 out_gunlock_q:
 763         gfs2_quota_unlock(ip);
 764         return error;
 765 }
 766
 767 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 768                      void *private)
 769 {
 770         struct buffer_head *bh;
 771         int error;
 772
 773         error = ea_alloc_blk(ip, &bh);
 774         if (error)
 775                 return error;
 776
 777         ip->i_eattr = bh->b_blocknr;
 778         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 779
 780         brelse(bh);
 781
 782         return error;
 783 }
 784
 785 /**
 786  * ea_init - initializes a new eattr block
 787  * @ip:
 788  * @er:
 789  *
 790  * Returns: errno
 791  */
 792
 793 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 794                    const void *data, size_t size)
 795 {
 796         struct gfs2_ea_request er;
 797         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 798         unsigned int blks = 1;
 799
 800         er.er_type = type;
 801         er.er_name = name;
 802         er.er_name_len = strlen(name);
 803         er.er_data = (void *)data;
 804         er.er_data_len = size;
 805
 806         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 807                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 808
 809         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 810 }
 811
 812 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 813 {
 814         u32 ea_size = GFS2_EA_SIZE(ea);
 815         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 816                                      ea_size);
 817         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 818         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 819
 820         ea->ea_rec_len = cpu_to_be32(ea_size);
 821         ea->ea_flags ^= last;
 822
 823         new->ea_rec_len = cpu_to_be32(new_size);
 824         new->ea_flags = last;
 825
 826         return new;
 827 }
 828
 829 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 830                                   struct gfs2_ea_location *el)
 831 {
 832         struct gfs2_ea_header *ea = el->el_ea;
 833         struct gfs2_ea_header *prev = el->el_prev;
 834         u32 len;
 835
 836         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 837
 838         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 839                 ea->ea_type = GFS2_EATYPE_UNUSED;
 840                 return;
 841         } else if (GFS2_EA2NEXT(prev) != ea) {
 842                 prev = GFS2_EA2NEXT(prev);
 843                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 844         }
 845
 846         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 847         prev->ea_rec_len = cpu_to_be32(len);
 848
 849         if (GFS2_EA_IS_LAST(ea))
 850                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 851 }
 852
 853 struct ea_set {
 854         int ea_split;
 855
 856         struct gfs2_ea_request *es_er;
 857         struct gfs2_ea_location *es_el;
 858
 859         struct buffer_head *es_bh;
 860         struct gfs2_ea_header *es_ea;
 861 };
 862
 863 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 864                                  struct gfs2_ea_header *ea, struct ea_set *es)
 865 {
 866         struct gfs2_ea_request *er = es->es_er;
 867         int error;
 868
 869         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 870         if (error)
 871                 return error;
 872
 873         gfs2_trans_add_meta(ip->i_gl, bh);
 874
 875         if (es->ea_split)
 876                 ea = ea_split_ea(ea);
 877
 878         ea_write(ip, ea, er);
 879
 880         if (es->es_el)
 881                 ea_set_remove_stuffed(ip, es->es_el);
 882
 883         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 884         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
 885
 886         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 887         return error;
 888 }
 889
 890 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 891                                struct gfs2_ea_request *er, void *private)
 892 {
 893         struct ea_set *es = private;
 894         struct gfs2_ea_header *ea = es->es_ea;
 895         int error;
 896
 897         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 898
 899         if (es->ea_split)
 900                 ea = ea_split_ea(ea);
 901
 902         error = ea_write(ip, ea, er);
 903         if (error)
 904                 return error;
 905
 906         if (es->es_el)
 907                 ea_set_remove_stuffed(ip, es->es_el);
 908
 909         return 0;
 910 }
 911
 912 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 913                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 914                          void *private)
 915 {
 916         struct ea_set *es = private;
 917         unsigned int size;
 918         int stuffed;
 919         int error;
 920
 921         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 922                                es->es_er->er_data_len, &size);
 923
 924         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 925                 if (GFS2_EA_REC_LEN(ea) < size)
 926                         return 0;
 927                 if (!GFS2_EA_IS_STUFFED(ea)) {
 928                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 929                         if (error)
 930                                 return error;
 931                 }
 932                 es->ea_split = 0;
 933         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 934                 es->ea_split = 1;
 935         else
 936                 return 0;
 937
 938         if (stuffed) {
 939                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 940                 if (error)
 941                         return error;
 942         } else {
 943                 unsigned int blks;
 944
 945                 es->es_bh = bh;
 946                 es->es_ea = ea;
 947                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 948                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 949
 950                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 951                                           ea_set_simple_alloc, es);
 952                 if (error)
 953                         return error;
 954         }
 955
 956         return 1;
 957 }
 958
 959 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 960                         void *private)
 961 {
 962         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 963         struct buffer_head *indbh, *newbh;
 964         __be64 *eablk;
 965         int error;
 966         int mh_size = sizeof(struct gfs2_meta_header);
 967
 968         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 969                 __be64 *end;
 970
 971                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
 972                                        &indbh);
 973                 if (error)
 974                         return error;
 975
 976                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 977                         error = -EIO;
 978                         goto out;
 979                 }
 980
 981                 eablk = (__be64 *)(indbh->b_data + mh_size);
 982                 end = eablk + sdp->sd_inptrs;
 983
 984                 for (; eablk < end; eablk++)
 985                         if (!*eablk)
 986                                 break;
 987
 988                 if (eablk == end) {
 989                         error = -ENOSPC;
 990                         goto out;
 991                 }
 992
 993                 gfs2_trans_add_meta(ip->i_gl, indbh);
 994         } else {
 995                 u64 blk;
 996                 unsigned int n = 1;
 997                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
 998                 if (error)
 999                         return error;
1000                 gfs2_trans_remove_revoke(sdp, blk, 1);
1001                 indbh = gfs2_meta_new(ip->i_gl, blk);
1002                 gfs2_trans_add_meta(ip->i_gl, indbh);
1003                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1004                 gfs2_buffer_clear_tail(indbh, mh_size);
1005
1006                 eablk = (__be64 *)(indbh->b_data + mh_size);
1007                 *eablk = cpu_to_be64(ip->i_eattr);
1008                 ip->i_eattr = blk;
1009                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1010                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1011
1012                 eablk++;
1013         }
1014
1015         error = ea_alloc_blk(ip, &newbh);
1016         if (error)
1017                 goto out;
1018
1019         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1020         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1021         brelse(newbh);
1022         if (error)
1023                 goto out;
1024
1025         if (private)
1026                 ea_set_remove_stuffed(ip, private);
1027
1028 out:
1029         brelse(indbh);
1030         return error;
1031 }
1032
1033 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1034                     const void *value, size_t size, struct gfs2_ea_location *el)
1035 {
1036         struct gfs2_ea_request er;
1037         struct ea_set es;
1038         unsigned int blks = 2;
1039         int error;
1040
1041         er.er_type = type;
1042         er.er_name = name;
1043         er.er_data = (void *)value;
1044         er.er_name_len = strlen(name);
1045         er.er_data_len = size;
1046
1047         memset(&es, 0, sizeof(struct ea_set));
1048         es.es_er = &er;
1049         es.es_el = el;
1050
1051         error = ea_foreach(ip, ea_set_simple, &es);
1052         if (error > 0)
1053                 return 0;
1054         if (error)
1055                 return error;
1056
1057         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1058                 blks++;
1059         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1060                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1061
1062         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1063 }
1064
1065 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1066                                    struct gfs2_ea_location *el)
1067 {
1068         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1069                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1070                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1071                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1072         }
1073
1074         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1075 }
1076
1077 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1078 {
1079         struct gfs2_ea_header *ea = el->el_ea;
1080         struct gfs2_ea_header *prev = el->el_prev;
1081         int error;
1082
1083         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1084         if (error)
1085                 return error;
1086
1087         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1088
1089         if (prev) {
1090                 u32 len;
1091
1092                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1093                 prev->ea_rec_len = cpu_to_be32(len);
1094
1095                 if (GFS2_EA_IS_LAST(ea))
1096                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1097         } else {
1098                 ea->ea_type = GFS2_EATYPE_UNUSED;
1099         }
1100
1101         ip->i_inode.i_ctime = current_time(&ip->i_inode);
1102         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1103
1104         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1105
1106         return error;
1107 }
1108
1109 /**
1110  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1111  * @ip: The inode
1112  * @type: The type of the extended attribute
1113  * @name: The name of the extended attribute
1114  *
1115  * This is not called directly by the VFS since we use the (common)
1116  * scheme of making a "set with NULL data" mean a remove request. Note
1117  * that this is different from a set with zero length data.
1118  *
1119  * Returns: 0, or errno on failure
1120  */
1121
1122 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1123 {
1124         struct gfs2_ea_location el;
1125         int error;
1126
1127         if (!ip->i_eattr)
1128                 return -ENODATA;
1129
1130         error = gfs2_ea_find(ip, type, name, &el);
1131         if (error)
1132                 return error;
1133         if (!el.el_ea)
1134                 return -ENODATA;
1135
1136         if (GFS2_EA_IS_STUFFED(el.el_ea))
1137                 error = ea_remove_stuffed(ip, &el);
1138         else
1139                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1140
1141         brelse(el.el_bh);
1142
1143         return error;
1144 }
1145
1146 /**
1147  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1148  * @ip: The inode
1149  * @name: The name of the extended attribute
1150  * @value: The value of the extended attribute (NULL for remove)
1151  * @size: The size of the @value argument
1152  * @flags: Create or Replace
1153  * @type: The type of the extended attribute
1154  *
1155  * See gfs2_xattr_remove() for details of the removal of xattrs.
1156  *
1157  * Returns: 0 or errno on failure
1158  */
1159
1160 int __gfs2_xattr_set(struct inode *inode, const char *name,
1161                    const void *value, size_t size, int flags, int type)
1162 {
1163         struct gfs2_inode *ip = GFS2_I(inode);
1164         struct gfs2_sbd *sdp = GFS2_SB(inode);
1165         struct gfs2_ea_location el;
1166         unsigned int namel = strlen(name);
1167         int error;
1168
1169         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1170                 return -EPERM;
1171         if (namel > GFS2_EA_MAX_NAME_LEN)
1172                 return -ERANGE;
1173
1174         if (value == NULL) {
1175                 error = gfs2_xattr_remove(ip, type, name);
1176                 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1177                         error = 0;
1178                 return error;
1179         }
1180
1181         if (ea_check_size(sdp, namel, size))
1182                 return -ERANGE;
1183
1184         if (!ip->i_eattr) {
1185                 if (flags & XATTR_REPLACE)
1186                         return -ENODATA;
1187                 return ea_init(ip, type, name, value, size);
1188         }
1189
1190         error = gfs2_ea_find(ip, type, name, &el);
1191         if (error)
1192                 return error;
1193
1194         if (el.el_ea) {
1195                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1196                         brelse(el.el_bh);
1197                         return -EPERM;
1198                 }
1199
1200                 error = -EEXIST;
1201                 if (!(flags & XATTR_CREATE)) {
1202                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1203                         error = ea_set_i(ip, type, name, value, size, &el);
1204                         if (!error && unstuffed)
1205                                 ea_set_remove_unstuffed(ip, &el);
1206                 }
1207
1208                 brelse(el.el_bh);
1209                 return error;
1210         }
1211
1212         error = -ENODATA;
1213         if (!(flags & XATTR_REPLACE))
1214                 error = ea_set_i(ip, type, name, value, size, NULL);
1215
1216         return error;
1217 }
1218
1219 static int gfs2_xattr_set(const struct xattr_handler *handler,
1220                           struct dentry *unused, struct inode *inode,
1221                           const char *name, const void *value,
1222                           size_t size, int flags)
1223 {
1224         struct gfs2_inode *ip = GFS2_I(inode);
1225         struct gfs2_holder gh;
1226         int ret;
1227
1228         ret = gfs2_rsqa_alloc(ip);
1229         if (ret)
1230                 return ret;
1231
1232         /* May be called from gfs_setattr with the glock locked. */
1233
1234         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1235                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1236                 if (ret)
1237                         return ret;
1238         } else {
1239                 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
1240                         return -EIO;
1241                 gfs2_holder_mark_uninitialized(&gh);
1242         }
1243         ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1244         if (gfs2_holder_initialized(&gh))
1245                 gfs2_glock_dq_uninit(&gh);
1246         return ret;
1247 }
1248
1249 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1250 {
1251         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1252         struct gfs2_rgrp_list rlist;
1253         struct gfs2_rgrpd *rgd;
1254         struct buffer_head *indbh, *dibh;
1255         __be64 *eablk, *end;
1256         unsigned int rg_blocks = 0;
1257         u64 bstart = 0;
1258         unsigned int blen = 0;
1259         unsigned int blks = 0;
1260         unsigned int x;
1261         int error;
1262
1263         error = gfs2_rindex_update(sdp);
1264         if (error)
1265                 return error;
1266
1267         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1268
1269         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1270         if (error)
1271                 return error;
1272
1273         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1274                 error = -EIO;
1275                 goto out;
1276         }
1277
1278         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1279         end = eablk + sdp->sd_inptrs;
1280
1281         for (; eablk < end; eablk++) {
1282                 u64 bn;
1283
1284                 if (!*eablk)
1285                         break;
1286                 bn = be64_to_cpu(*eablk);
1287
1288                 if (bstart + blen == bn)
1289                         blen++;
1290                 else {
1291                         if (bstart)
1292                                 gfs2_rlist_add(ip, &rlist, bstart);
1293                         bstart = bn;
1294                         blen = 1;
1295                 }
1296                 blks++;
1297         }
1298         if (bstart)
1299                 gfs2_rlist_add(ip, &rlist, bstart);
1300         else
1301                 goto out;
1302
1303         gfs2_rlist_alloc(&rlist);
1304
1305         for (x = 0; x < rlist.rl_rgrps; x++) {
1306                 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1307                 rg_blocks += rgd->rd_length;
1308         }
1309
1310         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1311         if (error)
1312                 goto out_rlist_free;
1313
1314         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1315                                  RES_STATFS + RES_QUOTA, blks);
1316         if (error)
1317                 goto out_gunlock;
1318
1319         gfs2_trans_add_meta(ip->i_gl, indbh);
1320
1321         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1322         bstart = 0;
1323         rgd = NULL;
1324         blen = 0;
1325
1326         for (; eablk < end; eablk++) {
1327                 u64 bn;
1328
1329                 if (!*eablk)
1330                         break;
1331                 bn = be64_to_cpu(*eablk);
1332
1333                 if (bstart + blen == bn)
1334                         blen++;
1335                 else {
1336                         if (bstart)
1337                                 gfs2_free_meta(ip, rgd, bstart, blen);
1338                         bstart = bn;
1339                         rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1340                         blen = 1;
1341                 }
1342
1343                 *eablk = 0;
1344                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1345         }
1346         if (bstart)
1347                 gfs2_free_meta(ip, rgd, bstart, blen);
1348
1349         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1350
1351         error = gfs2_meta_inode_buffer(ip, &dibh);
1352         if (!error) {
1353                 gfs2_trans_add_meta(ip->i_gl, dibh);
1354                 gfs2_dinode_out(ip, dibh->b_data);
1355                 brelse(dibh);
1356         }
1357
1358         gfs2_trans_end(sdp);
1359
1360 out_gunlock:
1361         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1362 out_rlist_free:
1363         gfs2_rlist_free(&rlist);
1364 out:
1365         brelse(indbh);
1366         return error;
1367 }
1368
1369 static int ea_dealloc_block(struct gfs2_inode *ip)
1370 {
1371         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1372         struct gfs2_rgrpd *rgd;
1373         struct buffer_head *dibh;
1374         struct gfs2_holder gh;
1375         int error;
1376
1377         error = gfs2_rindex_update(sdp);
1378         if (error)
1379                 return error;
1380
1381         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1382         if (!rgd) {
1383                 gfs2_consist_inode(ip);
1384                 return -EIO;
1385         }
1386
1387         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1388         if (error)
1389                 return error;
1390
1391         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1392                                  RES_QUOTA, 1);
1393         if (error)
1394                 goto out_gunlock;
1395
1396         gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1397
1398         ip->i_eattr = 0;
1399         gfs2_add_inode_blocks(&ip->i_inode, -1);
1400
1401         error = gfs2_meta_inode_buffer(ip, &dibh);
1402         if (!error) {
1403                 gfs2_trans_add_meta(ip->i_gl, dibh);
1404                 gfs2_dinode_out(ip, dibh->b_data);
1405                 brelse(dibh);
1406         }
1407
1408         gfs2_trans_end(sdp);
1409
1410 out_gunlock:
1411         gfs2_glock_dq_uninit(&gh);
1412         return error;
1413 }
1414
1415 /**
1416  * gfs2_ea_dealloc - deallocate the extended attribute fork
1417  * @ip: the inode
1418  *
1419  * Returns: errno
1420  */
1421
1422 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1423 {
1424         int error;
1425
1426         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1427         if (error)
1428                 return error;
1429
1430         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1431         if (error)
1432                 return error;
1433
1434         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1435         if (error)
1436                 goto out_quota;
1437
1438         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1439                 error = ea_dealloc_indirect(ip);
1440                 if (error)
1441                         goto out_quota;
1442         }
1443
1444         error = ea_dealloc_block(ip);
1445
1446 out_quota:
1447         gfs2_quota_unhold(ip);
1448         return error;
1449 }
1450
1451 static const struct xattr_handler gfs2_xattr_user_handler = {
1452         .prefix = XATTR_USER_PREFIX,
1453         .flags  = GFS2_EATYPE_USR,
1454         .get    = gfs2_xattr_get,
1455         .set    = gfs2_xattr_set,
1456 };
1457
1458 static const struct xattr_handler gfs2_xattr_security_handler = {
1459         .prefix = XATTR_SECURITY_PREFIX,
1460         .flags  = GFS2_EATYPE_SECURITY,
1461         .get    = gfs2_xattr_get,
1462         .set    = gfs2_xattr_set,
1463 };
1464
1465 const struct xattr_handler *gfs2_xattr_handlers[] = {
1466         &gfs2_xattr_user_handler,
1467         &gfs2_xattr_security_handler,
1468         &posix_acl_access_xattr_handler,
1469         &posix_acl_default_xattr_handler,
1470         NULL,
1471 };
1472