fs/gfs2/xattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <asm/uaccess.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include "glock.h"
  23 #include "inode.h"
  24 #include "meta_io.h"
  25 #include "quota.h"
  26 #include "rgrp.h"
  27 #include "trans.h"
  28 #include "util.h"
  29
  30 /**
  31  * ea_calc_size - returns the acutal number of bytes the request will take up
  32  *                (not counting any unstuffed data blocks)
  33  * @sdp:
  34  * @er:
  35  * @size:
  36  *
  37  * Returns: 1 if the EA should be stuffed
  38  */
  39
  40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  41                         unsigned int *size)
  42 {
  43         unsigned int jbsize = sdp->sd_jbsize;
  44
  45         /* Stuffed */
  46         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  47
  48         if (*size <= jbsize)
  49                 return 1;
  50
  51         /* Unstuffed */
  52         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  53                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  54
  55         return 0;
  56 }
  57
  58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  59 {
  60         unsigned int size;
  61
  62         if (dsize > GFS2_EA_MAX_DATA_LEN)
  63                 return -ERANGE;
  64
  65         ea_calc_size(sdp, nsize, dsize, &size);
  66
  67         /* This can only happen with 512 byte blocks */
  68         if (size > sdp->sd_jbsize)
  69                 return -ERANGE;
  70
  71         return 0;
  72 }
  73
  74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  75                           struct gfs2_ea_header *ea,
  76                           struct gfs2_ea_header *prev, void *private);
  77
  78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  79                         ea_call_t ea_call, void *data)
  80 {
  81         struct gfs2_ea_header *ea, *prev = NULL;
  82         int error = 0;
  83
  84         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  85                 return -EIO;
  86
  87         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  88                 if (!GFS2_EA_REC_LEN(ea))
  89                         goto fail;
  90                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  91                                                   bh->b_data + bh->b_size))
  92                         goto fail;
  93                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  94                         goto fail;
  95
  96                 error = ea_call(ip, bh, ea, prev, data);
  97                 if (error)
  98                         return error;
  99
 100                 if (GFS2_EA_IS_LAST(ea)) {
 101                         if ((char *)GFS2_EA2NEXT(ea) !=
 102                             bh->b_data + bh->b_size)
 103                                 goto fail;
 104                         break;
 105                 }
 106         }
 107
 108         return error;
 109
 110 fail:
 111         gfs2_consist_inode(ip);
 112         return -EIO;
 113 }
 114
 115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116 {
 117         struct buffer_head *bh, *eabh;
 118         __be64 *eablk, *end;
 119         int error;
 120
 121         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 122         if (error)
 123                 return error;
 124
 125         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 126                 error = ea_foreach_i(ip, bh, ea_call, data);
 127                 goto out;
 128         }
 129
 130         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 131                 error = -EIO;
 132                 goto out;
 133         }
 134
 135         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 136         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 137
 138         for (; eablk < end; eablk++) {
 139                 u64 bn;
 140
 141                 if (!*eablk)
 142                         break;
 143                 bn = be64_to_cpu(*eablk);
 144
 145                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 146                 if (error)
 147                         break;
 148                 error = ea_foreach_i(ip, eabh, ea_call, data);
 149                 brelse(eabh);
 150                 if (error)
 151                         break;
 152         }
 153 out:
 154         brelse(bh);
 155         return error;
 156 }
 157
 158 struct ea_find {
 159         int type;
 160         const char *name;
 161         size_t namel;
 162         struct gfs2_ea_location *ef_el;
 163 };
 164
 165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 166                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 167                      void *private)
 168 {
 169         struct ea_find *ef = private;
 170
 171         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 172                 return 0;
 173
 174         if (ea->ea_type == ef->type) {
 175                 if (ea->ea_name_len == ef->namel &&
 176                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 177                         struct gfs2_ea_location *el = ef->ef_el;
 178                         get_bh(bh);
 179                         el->el_bh = bh;
 180                         el->el_ea = ea;
 181                         el->el_prev = prev;
 182                         return 1;
 183                 }
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 190                         struct gfs2_ea_location *el)
 191 {
 192         struct ea_find ef;
 193         int error;
 194
 195         ef.type = type;
 196         ef.name = name;
 197         ef.namel = strlen(name);
 198         ef.ef_el = el;
 199
 200         memset(el, 0, sizeof(struct gfs2_ea_location));
 201
 202         error = ea_foreach(ip, ea_find_i, &ef);
 203         if (error > 0)
 204                 return 0;
 205
 206         return error;
 207 }
 208
 209 /**
 210  * ea_dealloc_unstuffed -
 211  * @ip:
 212  * @bh:
 213  * @ea:
 214  * @prev:
 215  * @private:
 216  *
 217  * Take advantage of the fact that all unstuffed blocks are
 218  * allocated from the same RG.  But watch, this may not always
 219  * be true.
 220  *
 221  * Returns: errno
 222  */
 223
 224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 225                                 struct gfs2_ea_header *ea,
 226                                 struct gfs2_ea_header *prev, void *private)
 227 {
 228         int *leave = private;
 229         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230         struct gfs2_rgrpd *rgd;
 231         struct gfs2_holder rg_gh;
 232         struct buffer_head *dibh;
 233         __be64 *dataptrs;
 234         u64 bn = 0;
 235         u64 bstart = 0;
 236         unsigned int blen = 0;
 237         unsigned int blks = 0;
 238         unsigned int x;
 239         int error;
 240
 241         if (GFS2_EA_IS_STUFFED(ea))
 242                 return 0;
 243
 244         dataptrs = GFS2_EA2DATAPTRS(ea);
 245         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 246                 if (*dataptrs) {
 247                         blks++;
 248                         bn = be64_to_cpu(*dataptrs);
 249                 }
 250         }
 251         if (!blks)
 252                 return 0;
 253
 254         rgd = gfs2_blk2rgrpd(sdp, bn);
 255         if (!rgd) {
 256                 gfs2_consist_inode(ip);
 257                 return -EIO;
 258         }
 259
 260         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 261         if (error)
 262                 return error;
 263
 264         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 265                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 266         if (error)
 267                 goto out_gunlock;
 268
 269         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 270
 271         dataptrs = GFS2_EA2DATAPTRS(ea);
 272         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 273                 if (!*dataptrs)
 274                         break;
 275                 bn = be64_to_cpu(*dataptrs);
 276
 277                 if (bstart + blen == bn)
 278                         blen++;
 279                 else {
 280                         if (bstart)
 281                                 gfs2_free_meta(ip, bstart, blen);
 282                         bstart = bn;
 283                         blen = 1;
 284                 }
 285
 286                 *dataptrs = 0;
 287                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 288         }
 289         if (bstart)
 290                 gfs2_free_meta(ip, bstart, blen);
 291
 292         if (prev && !leave) {
 293                 u32 len;
 294
 295                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 296                 prev->ea_rec_len = cpu_to_be32(len);
 297
 298                 if (GFS2_EA_IS_LAST(ea))
 299                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 300         } else {
 301                 ea->ea_type = GFS2_EATYPE_UNUSED;
 302                 ea->ea_num_ptrs = 0;
 303         }
 304
 305         error = gfs2_meta_inode_buffer(ip, &dibh);
 306         if (!error) {
 307                 ip->i_inode.i_ctime = CURRENT_TIME;
 308                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 309                 gfs2_dinode_out(ip, dibh->b_data);
 310                 brelse(dibh);
 311         }
 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         struct gfs2_alloc *al;
 325         int error;
 326
 327         al = gfs2_alloc_get(ip);
 328         if (!al)
 329                 return -ENOMEM;
 330
 331         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 332         if (error)
 333                 goto out_alloc;
 334
 335         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 336         if (error)
 337                 goto out_quota;
 338
 339         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341         gfs2_glock_dq_uninit(&al->al_ri_gh);
 342
 343 out_quota:
 344         gfs2_quota_unhold(ip);
 345 out_alloc:
 346         gfs2_alloc_put(ip);
 347         return error;
 348 }
 349
 350 struct ea_list {
 351         struct gfs2_ea_request *ei_er;
 352         unsigned int ei_size;
 353 };
 354
 355 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 356 {
 357         switch (ea->ea_type) {
 358         case GFS2_EATYPE_USR:
 359                 return 5 + ea->ea_name_len + 1;
 360         case GFS2_EATYPE_SYS:
 361                 return 7 + ea->ea_name_len + 1;
 362         case GFS2_EATYPE_SECURITY:
 363                 return 9 + ea->ea_name_len + 1;
 364         default:
 365                 return 0;
 366         }
 367 }
 368
 369 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 370                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 371                      void *private)
 372 {
 373         struct ea_list *ei = private;
 374         struct gfs2_ea_request *er = ei->ei_er;
 375         unsigned int ea_size = gfs2_ea_strlen(ea);
 376
 377         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 378                 return 0;
 379
 380         if (er->er_data_len) {
 381                 char *prefix = NULL;
 382                 unsigned int l = 0;
 383                 char c = 0;
 384
 385                 if (ei->ei_size + ea_size > er->er_data_len)
 386                         return -ERANGE;
 387
 388                 switch (ea->ea_type) {
 389                 case GFS2_EATYPE_USR:
 390                         prefix = "user.";
 391                         l = 5;
 392                         break;
 393                 case GFS2_EATYPE_SYS:
 394                         prefix = "system.";
 395                         l = 7;
 396                         break;
 397                 case GFS2_EATYPE_SECURITY:
 398                         prefix = "security.";
 399                         l = 9;
 400                         break;
 401                 }
 402
 403                 BUG_ON(l == 0);
 404
 405                 memcpy(er->er_data + ei->ei_size, prefix, l);
 406                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 407                        ea->ea_name_len);
 408                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 409         }
 410
 411         ei->ei_size += ea_size;
 412
 413         return 0;
 414 }
 415
 416 /**
 417  * gfs2_listxattr - List gfs2 extended attributes
 418  * @dentry: The dentry whose inode we are interested in
 419  * @buffer: The buffer to write the results
 420  * @size: The size of the buffer
 421  *
 422  * Returns: actual size of data on success, -errno on error
 423  */
 424
 425 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 426 {
 427         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 428         struct gfs2_ea_request er;
 429         struct gfs2_holder i_gh;
 430         int error;
 431
 432         memset(&er, 0, sizeof(struct gfs2_ea_request));
 433         if (size) {
 434                 er.er_data = buffer;
 435                 er.er_data_len = size;
 436         }
 437
 438         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 439         if (error)
 440                 return error;
 441
 442         if (ip->i_eattr) {
 443                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 444
 445                 error = ea_foreach(ip, ea_list_i, &ei);
 446                 if (!error)
 447                         error = ei.ei_size;
 448         }
 449
 450         gfs2_glock_dq_uninit(&i_gh);
 451
 452         return error;
 453 }
 454
 455 /**
 456  * ea_get_unstuffed - actually copies the unstuffed data into the
 457  *                    request buffer
 458  * @ip: The GFS2 inode
 459  * @ea: The extended attribute header structure
 460  * @data: The data to be copied
 461  *
 462  * Returns: errno
 463  */
 464
 465 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 466                             char *data)
 467 {
 468         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 469         struct buffer_head **bh;
 470         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 471         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 472         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 473         unsigned int x;
 474         int error = 0;
 475
 476         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 477         if (!bh)
 478                 return -ENOMEM;
 479
 480         for (x = 0; x < nptrs; x++) {
 481                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 482                                        bh + x);
 483                 if (error) {
 484                         while (x--)
 485                                 brelse(bh[x]);
 486                         goto out;
 487                 }
 488                 dataptrs++;
 489         }
 490
 491         for (x = 0; x < nptrs; x++) {
 492                 error = gfs2_meta_wait(sdp, bh[x]);
 493                 if (error) {
 494                         for (; x < nptrs; x++)
 495                                 brelse(bh[x]);
 496                         goto out;
 497                 }
 498                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 499                         for (; x < nptrs; x++)
 500                                 brelse(bh[x]);
 501                         error = -EIO;
 502                         goto out;
 503                 }
 504
 505                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 506                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 507
 508                 amount -= sdp->sd_jbsize;
 509                 data += sdp->sd_jbsize;
 510
 511                 brelse(bh[x]);
 512         }
 513
 514 out:
 515         kfree(bh);
 516         return error;
 517 }
 518
 519 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 520                             char *data, size_t size)
 521 {
 522         int ret;
 523         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 524         if (len > size)
 525                 return -ERANGE;
 526
 527         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 528                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 529                 return len;
 530         }
 531         ret = ea_get_unstuffed(ip, el->el_ea, data);
 532         if (ret < 0)
 533                 return ret;
 534         return len;
 535 }
 536
 537 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 538 {
 539         struct gfs2_ea_location el;
 540         int error;
 541         int len;
 542         char *data;
 543
 544         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 545         if (error)
 546                 return error;
 547         if (!el.el_ea)
 548                 goto out;
 549         if (!GFS2_EA_DATA_LEN(el.el_ea))
 550                 goto out;
 551
 552         len = GFS2_EA_DATA_LEN(el.el_ea);
 553         data = kmalloc(len, GFP_NOFS);
 554         error = -ENOMEM;
 555         if (data == NULL)
 556                 goto out;
 557
 558         error = gfs2_ea_get_copy(ip, &el, data, len);
 559         if (error == 0)
 560                 error = len;
 561         *ppdata = data;
 562 out:
 563         brelse(el.el_bh);
 564         return error;
 565 }
 566
 567 /**
 568  * gfs2_xattr_get - Get a GFS2 extended attribute
 569  * @inode: The inode
 570  * @type: The type of extended attribute
 571  * @name: The name of the extended attribute
 572  * @buffer: The buffer to write the result into
 573  * @size: The size of the buffer
 574  *
 575  * Returns: actual size of data on success, -errno on error
 576  */
 577
 578 int gfs2_xattr_get(struct inode *inode, int type, const char *name,
 579                    void *buffer, size_t size)
 580 {
 581         struct gfs2_inode *ip = GFS2_I(inode);
 582         struct gfs2_ea_location el;
 583         int error;
 584
 585         if (!ip->i_eattr)
 586                 return -ENODATA;
 587         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 588                 return -EINVAL;
 589
 590         error = gfs2_ea_find(ip, type, name, &el);
 591         if (error)
 592                 return error;
 593         if (!el.el_ea)
 594                 return -ENODATA;
 595         if (size)
 596                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 597         else
 598                 error = GFS2_EA_DATA_LEN(el.el_ea);
 599         brelse(el.el_bh);
 600
 601         return error;
 602 }
 603
 604 /**
 605  * ea_alloc_blk - allocates a new block for extended attributes.
 606  * @ip: A pointer to the inode that's getting extended attributes
 607  * @bhp: Pointer to pointer to a struct buffer_head
 608  *
 609  * Returns: errno
 610  */
 611
 612 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 613 {
 614         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 615         struct gfs2_ea_header *ea;
 616         unsigned int n = 1;
 617         u64 block;
 618         int error;
 619
 620         error = gfs2_alloc_block(ip, &block, &n);
 621         if (error)
 622                 return error;
 623         gfs2_trans_add_unrevoke(sdp, block, 1);
 624         *bhp = gfs2_meta_new(ip->i_gl, block);
 625         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 626         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 627         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 628
 629         ea = GFS2_EA_BH2FIRST(*bhp);
 630         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 631         ea->ea_type = GFS2_EATYPE_UNUSED;
 632         ea->ea_flags = GFS2_EAFLAG_LAST;
 633         ea->ea_num_ptrs = 0;
 634
 635         gfs2_add_inode_blocks(&ip->i_inode, 1);
 636
 637         return 0;
 638 }
 639
 640 /**
 641  * ea_write - writes the request info to an ea, creating new blocks if
 642  *            necessary
 643  * @ip: inode that is being modified
 644  * @ea: the location of the new ea in a block
 645  * @er: the write request
 646  *
 647  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 648  *
 649  * returns : errno
 650  */
 651
 652 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 653                     struct gfs2_ea_request *er)
 654 {
 655         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 656         int error;
 657
 658         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 659         ea->ea_name_len = er->er_name_len;
 660         ea->ea_type = er->er_type;
 661         ea->__pad = 0;
 662
 663         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 664
 665         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 666                 ea->ea_num_ptrs = 0;
 667                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 668         } else {
 669                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 670                 const char *data = er->er_data;
 671                 unsigned int data_len = er->er_data_len;
 672                 unsigned int copy;
 673                 unsigned int x;
 674
 675                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 676                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 677                         struct buffer_head *bh;
 678                         u64 block;
 679                         int mh_size = sizeof(struct gfs2_meta_header);
 680                         unsigned int n = 1;
 681
 682                         error = gfs2_alloc_block(ip, &block, &n);
 683                         if (error)
 684                                 return error;
 685                         gfs2_trans_add_unrevoke(sdp, block, 1);
 686                         bh = gfs2_meta_new(ip->i_gl, block);
 687                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 688                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 689
 690                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 691
 692                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 693                                                            data_len;
 694                         memcpy(bh->b_data + mh_size, data, copy);
 695                         if (copy < sdp->sd_jbsize)
 696                                 memset(bh->b_data + mh_size + copy, 0,
 697                                        sdp->sd_jbsize - copy);
 698
 699                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 700                         data += copy;
 701                         data_len -= copy;
 702
 703                         brelse(bh);
 704                 }
 705
 706                 gfs2_assert_withdraw(sdp, !data_len);
 707         }
 708
 709         return 0;
 710 }
 711
 712 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 713                                    struct gfs2_ea_request *er, void *private);
 714
 715 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 716                              unsigned int blks,
 717                              ea_skeleton_call_t skeleton_call, void *private)
 718 {
 719         struct gfs2_alloc *al;
 720         struct buffer_head *dibh;
 721         int error;
 722
 723         al = gfs2_alloc_get(ip);
 724         if (!al)
 725                 return -ENOMEM;
 726
 727         error = gfs2_quota_lock_check(ip);
 728         if (error)
 729                 goto out;
 730
 731         al->al_requested = blks;
 732
 733         error = gfs2_inplace_reserve(ip);
 734         if (error)
 735                 goto out_gunlock_q;
 736
 737         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 738                                  blks + al->al_rgd->rd_length +
 739                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 740         if (error)
 741                 goto out_ipres;
 742
 743         error = skeleton_call(ip, er, private);
 744         if (error)
 745                 goto out_end_trans;
 746
 747         error = gfs2_meta_inode_buffer(ip, &dibh);
 748         if (!error) {
 749                 ip->i_inode.i_ctime = CURRENT_TIME;
 750                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 751                 gfs2_dinode_out(ip, dibh->b_data);
 752                 brelse(dibh);
 753         }
 754
 755 out_end_trans:
 756         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 757 out_ipres:
 758         gfs2_inplace_release(ip);
 759 out_gunlock_q:
 760         gfs2_quota_unlock(ip);
 761 out:
 762         gfs2_alloc_put(ip);
 763         return error;
 764 }
 765
 766 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 767                      void *private)
 768 {
 769         struct buffer_head *bh;
 770         int error;
 771
 772         error = ea_alloc_blk(ip, &bh);
 773         if (error)
 774                 return error;
 775
 776         ip->i_eattr = bh->b_blocknr;
 777         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 778
 779         brelse(bh);
 780
 781         return error;
 782 }
 783
 784 /**
 785  * ea_init - initializes a new eattr block
 786  * @ip:
 787  * @er:
 788  *
 789  * Returns: errno
 790  */
 791
 792 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 793                    const void *data, size_t size)
 794 {
 795         struct gfs2_ea_request er;
 796         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 797         unsigned int blks = 1;
 798
 799         er.er_type = type;
 800         er.er_name = name;
 801         er.er_name_len = strlen(name);
 802         er.er_data = (void *)data;
 803         er.er_data_len = size;
 804
 805         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 806                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 807
 808         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 809 }
 810
 811 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 812 {
 813         u32 ea_size = GFS2_EA_SIZE(ea);
 814         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 815                                      ea_size);
 816         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 817         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 818
 819         ea->ea_rec_len = cpu_to_be32(ea_size);
 820         ea->ea_flags ^= last;
 821
 822         new->ea_rec_len = cpu_to_be32(new_size);
 823         new->ea_flags = last;
 824
 825         return new;
 826 }
 827
 828 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 829                                   struct gfs2_ea_location *el)
 830 {
 831         struct gfs2_ea_header *ea = el->el_ea;
 832         struct gfs2_ea_header *prev = el->el_prev;
 833         u32 len;
 834
 835         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 836
 837         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 838                 ea->ea_type = GFS2_EATYPE_UNUSED;
 839                 return;
 840         } else if (GFS2_EA2NEXT(prev) != ea) {
 841                 prev = GFS2_EA2NEXT(prev);
 842                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 843         }
 844
 845         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 846         prev->ea_rec_len = cpu_to_be32(len);
 847
 848         if (GFS2_EA_IS_LAST(ea))
 849                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 850 }
 851
 852 struct ea_set {
 853         int ea_split;
 854
 855         struct gfs2_ea_request *es_er;
 856         struct gfs2_ea_location *es_el;
 857
 858         struct buffer_head *es_bh;
 859         struct gfs2_ea_header *es_ea;
 860 };
 861
 862 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 863                                  struct gfs2_ea_header *ea, struct ea_set *es)
 864 {
 865         struct gfs2_ea_request *er = es->es_er;
 866         struct buffer_head *dibh;
 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_bh(ip->i_gl, bh, 1);
 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         error = gfs2_meta_inode_buffer(ip, &dibh);
 884         if (error)
 885                 goto out;
 886         ip->i_inode.i_ctime = CURRENT_TIME;
 887         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 888         gfs2_dinode_out(ip, dibh->b_data);
 889         brelse(dibh);
 890 out:
 891         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 892         return error;
 893 }
 894
 895 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 896                                struct gfs2_ea_request *er, void *private)
 897 {
 898         struct ea_set *es = private;
 899         struct gfs2_ea_header *ea = es->es_ea;
 900         int error;
 901
 902         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 903
 904         if (es->ea_split)
 905                 ea = ea_split_ea(ea);
 906
 907         error = ea_write(ip, ea, er);
 908         if (error)
 909                 return error;
 910
 911         if (es->es_el)
 912                 ea_set_remove_stuffed(ip, es->es_el);
 913
 914         return 0;
 915 }
 916
 917 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 918                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 919                          void *private)
 920 {
 921         struct ea_set *es = private;
 922         unsigned int size;
 923         int stuffed;
 924         int error;
 925
 926         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 927                                es->es_er->er_data_len, &size);
 928
 929         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 930                 if (GFS2_EA_REC_LEN(ea) < size)
 931                         return 0;
 932                 if (!GFS2_EA_IS_STUFFED(ea)) {
 933                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 934                         if (error)
 935                                 return error;
 936                 }
 937                 es->ea_split = 0;
 938         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 939                 es->ea_split = 1;
 940         else
 941                 return 0;
 942
 943         if (stuffed) {
 944                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 945                 if (error)
 946                         return error;
 947         } else {
 948                 unsigned int blks;
 949
 950                 es->es_bh = bh;
 951                 es->es_ea = ea;
 952                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 953                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 954
 955                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 956                                           ea_set_simple_alloc, es);
 957                 if (error)
 958                         return error;
 959         }
 960
 961         return 1;
 962 }
 963
 964 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 965                         void *private)
 966 {
 967         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 968         struct buffer_head *indbh, *newbh;
 969         __be64 *eablk;
 970         int error;
 971         int mh_size = sizeof(struct gfs2_meta_header);
 972
 973         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 974                 __be64 *end;
 975
 976                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 977                                        &indbh);
 978                 if (error)
 979                         return error;
 980
 981                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 982                         error = -EIO;
 983                         goto out;
 984                 }
 985
 986                 eablk = (__be64 *)(indbh->b_data + mh_size);
 987                 end = eablk + sdp->sd_inptrs;
 988
 989                 for (; eablk < end; eablk++)
 990                         if (!*eablk)
 991                                 break;
 992
 993                 if (eablk == end) {
 994                         error = -ENOSPC;
 995                         goto out;
 996                 }
 997
 998                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 999         } else {
1000                 u64 blk;
1001                 unsigned int n = 1;
1002                 error = gfs2_alloc_block(ip, &blk, &n);
1003                 if (error)
1004                         return error;
1005                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1006                 indbh = gfs2_meta_new(ip->i_gl, blk);
1007                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1008                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1009                 gfs2_buffer_clear_tail(indbh, mh_size);
1010
1011                 eablk = (__be64 *)(indbh->b_data + mh_size);
1012                 *eablk = cpu_to_be64(ip->i_eattr);
1013                 ip->i_eattr = blk;
1014                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1015                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1016
1017                 eablk++;
1018         }
1019
1020         error = ea_alloc_blk(ip, &newbh);
1021         if (error)
1022                 goto out;
1023
1024         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1025         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1026         brelse(newbh);
1027         if (error)
1028                 goto out;
1029
1030         if (private)
1031                 ea_set_remove_stuffed(ip, private);
1032
1033 out:
1034         brelse(indbh);
1035         return error;
1036 }
1037
1038 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1039                     const void *value, size_t size, struct gfs2_ea_location *el)
1040 {
1041         struct gfs2_ea_request er;
1042         struct ea_set es;
1043         unsigned int blks = 2;
1044         int error;
1045
1046         er.er_type = type;
1047         er.er_name = name;
1048         er.er_data = (void *)value;
1049         er.er_name_len = strlen(name);
1050         er.er_data_len = size;
1051
1052         memset(&es, 0, sizeof(struct ea_set));
1053         es.es_er = &er;
1054         es.es_el = el;
1055
1056         error = ea_foreach(ip, ea_set_simple, &es);
1057         if (error > 0)
1058                 return 0;
1059         if (error)
1060                 return error;
1061
1062         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1063                 blks++;
1064         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1065                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1066
1067         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1068 }
1069
1070 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1071                                    struct gfs2_ea_location *el)
1072 {
1073         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1074                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1075                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1076                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1077         }
1078
1079         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1080 }
1081
1082 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1083 {
1084         struct gfs2_ea_header *ea = el->el_ea;
1085         struct gfs2_ea_header *prev = el->el_prev;
1086         struct buffer_head *dibh;
1087         int error;
1088
1089         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1090         if (error)
1091                 return error;
1092
1093         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1094
1095         if (prev) {
1096                 u32 len;
1097
1098                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1099                 prev->ea_rec_len = cpu_to_be32(len);
1100
1101                 if (GFS2_EA_IS_LAST(ea))
1102                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1103         } else {
1104                 ea->ea_type = GFS2_EATYPE_UNUSED;
1105         }
1106
1107         error = gfs2_meta_inode_buffer(ip, &dibh);
1108         if (!error) {
1109                 ip->i_inode.i_ctime = CURRENT_TIME;
1110                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1111                 gfs2_dinode_out(ip, dibh->b_data);
1112                 brelse(dibh);
1113         }
1114
1115         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1116
1117         return error;
1118 }
1119
1120 /**
1121  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1122  * @inode: The inode
1123  * @type: The type of the extended attribute
1124  * @name: The name of the extended attribute
1125  *
1126  * This is not called directly by the VFS since we use the (common)
1127  * scheme of making a "set with NULL data" mean a remove request. Note
1128  * that this is different from a set with zero length data.
1129  *
1130  * Returns: 0, or errno on failure
1131  */
1132
1133 static int gfs2_xattr_remove(struct inode *inode, int type, const char *name)
1134 {
1135         struct gfs2_inode *ip = GFS2_I(inode);
1136         struct gfs2_ea_location el;
1137         int error;
1138
1139         if (!ip->i_eattr)
1140                 return -ENODATA;
1141
1142         error = gfs2_ea_find(ip, type, name, &el);
1143         if (error)
1144                 return error;
1145         if (!el.el_ea)
1146                 return -ENODATA;
1147
1148         if (GFS2_EA_IS_STUFFED(el.el_ea))
1149                 error = ea_remove_stuffed(ip, &el);
1150         else
1151                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1152
1153         brelse(el.el_bh);
1154
1155         return error;
1156 }
1157
1158 /**
1159  * gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1160  * @inode: The inode
1161  * @type: The type of the extended attribute
1162  * @name: The name of the extended attribute
1163  * @value: The value of the extended attribute (NULL for remove)
1164  * @size: The size of the @value argument
1165  * @flags: Create or Replace
1166  *
1167  * See gfs2_xattr_remove() for details of the removal of xattrs.
1168  *
1169  * Returns: 0 or errno on failure
1170  */
1171
1172 int gfs2_xattr_set(struct inode *inode, int type, const char *name,
1173                    const void *value, size_t size, int flags)
1174 {
1175         struct gfs2_sbd *sdp = GFS2_SB(inode);
1176         struct gfs2_inode *ip = GFS2_I(inode);
1177         struct gfs2_ea_location el;
1178         unsigned int namel = strlen(name);
1179         int error;
1180
1181         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1182                 return -EPERM;
1183         if (namel > GFS2_EA_MAX_NAME_LEN)
1184                 return -ERANGE;
1185
1186         if (value == NULL)
1187                 return gfs2_xattr_remove(inode, type, name);
1188
1189         if (ea_check_size(sdp, namel, size))
1190                 return -ERANGE;
1191
1192         if (!ip->i_eattr) {
1193                 if (flags & XATTR_REPLACE)
1194                         return -ENODATA;
1195                 return ea_init(ip, type, name, value, size);
1196         }
1197
1198         error = gfs2_ea_find(ip, type, name, &el);
1199         if (error)
1200                 return error;
1201
1202         if (el.el_ea) {
1203                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1204                         brelse(el.el_bh);
1205                         return -EPERM;
1206                 }
1207
1208                 error = -EEXIST;
1209                 if (!(flags & XATTR_CREATE)) {
1210                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1211                         error = ea_set_i(ip, type, name, value, size, &el);
1212                         if (!error && unstuffed)
1213                                 ea_set_remove_unstuffed(ip, &el);
1214                 }
1215
1216                 brelse(el.el_bh);
1217                 return error;
1218         }
1219
1220         error = -ENODATA;
1221         if (!(flags & XATTR_REPLACE))
1222                 error = ea_set_i(ip, type, name, value, size, NULL);
1223
1224         return error;
1225 }
1226
1227 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1228                                   struct gfs2_ea_header *ea, char *data)
1229 {
1230         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1231         struct buffer_head **bh;
1232         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1233         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1234         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1235         unsigned int x;
1236         int error;
1237
1238         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1239         if (!bh)
1240                 return -ENOMEM;
1241
1242         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1243         if (error)
1244                 goto out;
1245
1246         for (x = 0; x < nptrs; x++) {
1247                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1248                                        bh + x);
1249                 if (error) {
1250                         while (x--)
1251                                 brelse(bh[x]);
1252                         goto fail;
1253                 }
1254                 dataptrs++;
1255         }
1256
1257         for (x = 0; x < nptrs; x++) {
1258                 error = gfs2_meta_wait(sdp, bh[x]);
1259                 if (error) {
1260                         for (; x < nptrs; x++)
1261                                 brelse(bh[x]);
1262                         goto fail;
1263                 }
1264                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1265                         for (; x < nptrs; x++)
1266                                 brelse(bh[x]);
1267                         error = -EIO;
1268                         goto fail;
1269                 }
1270
1271                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1272
1273                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1274                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1275
1276                 amount -= sdp->sd_jbsize;
1277                 data += sdp->sd_jbsize;
1278
1279                 brelse(bh[x]);
1280         }
1281
1282 out:
1283         kfree(bh);
1284         return error;
1285
1286 fail:
1287         gfs2_trans_end(sdp);
1288         kfree(bh);
1289         return error;
1290 }
1291
1292 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1293 {
1294         struct gfs2_ea_location el;
1295         struct buffer_head *dibh;
1296         int error;
1297
1298         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1299         if (error)
1300                 return error;
1301
1302         if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1303                 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1304                 if (error)
1305                         return error;
1306
1307                 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1308                 memcpy(GFS2_EA2DATA(el.el_ea), data,
1309                        GFS2_EA_DATA_LEN(el.el_ea));
1310         } else
1311                 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1312
1313         if (error)
1314                 return error;
1315
1316         error = gfs2_meta_inode_buffer(ip, &dibh);
1317         if (!error) {
1318                 error = inode_setattr(&ip->i_inode, attr);
1319                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1320                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1321                 gfs2_dinode_out(ip, dibh->b_data);
1322                 brelse(dibh);
1323         }
1324
1325         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1326
1327         return error;
1328 }
1329
1330 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1331 {
1332         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1333         struct gfs2_rgrp_list rlist;
1334         struct buffer_head *indbh, *dibh;
1335         __be64 *eablk, *end;
1336         unsigned int rg_blocks = 0;
1337         u64 bstart = 0;
1338         unsigned int blen = 0;
1339         unsigned int blks = 0;
1340         unsigned int x;
1341         int error;
1342
1343         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1344
1345         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1346         if (error)
1347                 return error;
1348
1349         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1350                 error = -EIO;
1351                 goto out;
1352         }
1353
1354         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1355         end = eablk + sdp->sd_inptrs;
1356
1357         for (; eablk < end; eablk++) {
1358                 u64 bn;
1359
1360                 if (!*eablk)
1361                         break;
1362                 bn = be64_to_cpu(*eablk);
1363
1364                 if (bstart + blen == bn)
1365                         blen++;
1366                 else {
1367                         if (bstart)
1368                                 gfs2_rlist_add(sdp, &rlist, bstart);
1369                         bstart = bn;
1370                         blen = 1;
1371                 }
1372                 blks++;
1373         }
1374         if (bstart)
1375                 gfs2_rlist_add(sdp, &rlist, bstart);
1376         else
1377                 goto out;
1378
1379         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1380
1381         for (x = 0; x < rlist.rl_rgrps; x++) {
1382                 struct gfs2_rgrpd *rgd;
1383                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1384                 rg_blocks += rgd->rd_length;
1385         }
1386
1387         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1388         if (error)
1389                 goto out_rlist_free;
1390
1391         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1392                                  RES_STATFS + RES_QUOTA, blks);
1393         if (error)
1394                 goto out_gunlock;
1395
1396         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1397
1398         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1399         bstart = 0;
1400         blen = 0;
1401
1402         for (; eablk < end; eablk++) {
1403                 u64 bn;
1404
1405                 if (!*eablk)
1406                         break;
1407                 bn = be64_to_cpu(*eablk);
1408
1409                 if (bstart + blen == bn)
1410                         blen++;
1411                 else {
1412                         if (bstart)
1413                                 gfs2_free_meta(ip, bstart, blen);
1414                         bstart = bn;
1415                         blen = 1;
1416                 }
1417
1418                 *eablk = 0;
1419                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1420         }
1421         if (bstart)
1422                 gfs2_free_meta(ip, bstart, blen);
1423
1424         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1425
1426         error = gfs2_meta_inode_buffer(ip, &dibh);
1427         if (!error) {
1428                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1429                 gfs2_dinode_out(ip, dibh->b_data);
1430                 brelse(dibh);
1431         }
1432
1433         gfs2_trans_end(sdp);
1434
1435 out_gunlock:
1436         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1437 out_rlist_free:
1438         gfs2_rlist_free(&rlist);
1439 out:
1440         brelse(indbh);
1441         return error;
1442 }
1443
1444 static int ea_dealloc_block(struct gfs2_inode *ip)
1445 {
1446         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1447         struct gfs2_alloc *al = ip->i_alloc;
1448         struct gfs2_rgrpd *rgd;
1449         struct buffer_head *dibh;
1450         int error;
1451
1452         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1453         if (!rgd) {
1454                 gfs2_consist_inode(ip);
1455                 return -EIO;
1456         }
1457
1458         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1459                                    &al->al_rgd_gh);
1460         if (error)
1461                 return error;
1462
1463         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1464                                  RES_QUOTA, 1);
1465         if (error)
1466                 goto out_gunlock;
1467
1468         gfs2_free_meta(ip, ip->i_eattr, 1);
1469
1470         ip->i_eattr = 0;
1471         gfs2_add_inode_blocks(&ip->i_inode, -1);
1472
1473         error = gfs2_meta_inode_buffer(ip, &dibh);
1474         if (!error) {
1475                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1476                 gfs2_dinode_out(ip, dibh->b_data);
1477                 brelse(dibh);
1478         }
1479
1480         gfs2_trans_end(sdp);
1481
1482 out_gunlock:
1483         gfs2_glock_dq_uninit(&al->al_rgd_gh);
1484         return error;
1485 }
1486
1487 /**
1488  * gfs2_ea_dealloc - deallocate the extended attribute fork
1489  * @ip: the inode
1490  *
1491  * Returns: errno
1492  */
1493
1494 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1495 {
1496         struct gfs2_alloc *al;
1497         int error;
1498
1499         al = gfs2_alloc_get(ip);
1500         if (!al)
1501                 return -ENOMEM;
1502
1503         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1504         if (error)
1505                 goto out_alloc;
1506
1507         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1508         if (error)
1509                 goto out_quota;
1510
1511         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1512         if (error)
1513                 goto out_rindex;
1514
1515         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1516                 error = ea_dealloc_indirect(ip);
1517                 if (error)
1518                         goto out_rindex;
1519         }
1520
1521         error = ea_dealloc_block(ip);
1522
1523 out_rindex:
1524         gfs2_glock_dq_uninit(&al->al_ri_gh);
1525 out_quota:
1526         gfs2_quota_unhold(ip);
1527 out_alloc:
1528         gfs2_alloc_put(ip);
1529         return error;
1530 }
1531
1532 static int gfs2_xattr_user_get(struct inode *inode, const char *name,
1533                                void *buffer, size_t size)
1534 {
1535         return gfs2_xattr_get(inode, GFS2_EATYPE_USR, name, buffer, size);
1536 }
1537
1538 static int gfs2_xattr_user_set(struct inode *inode, const char *name,
1539                                const void *value, size_t size, int flags)
1540 {
1541         return gfs2_xattr_set(inode, GFS2_EATYPE_USR, name, value, size, flags);
1542 }
1543
1544 static int gfs2_xattr_security_get(struct inode *inode, const char *name,
1545                                    void *buffer, size_t size)
1546 {
1547         return gfs2_xattr_get(inode, GFS2_EATYPE_SECURITY, name, buffer, size);
1548 }
1549
1550 static int gfs2_xattr_security_set(struct inode *inode, const char *name,
1551                                    const void *value, size_t size, int flags)
1552 {
1553         return gfs2_xattr_set(inode, GFS2_EATYPE_SECURITY, name, value, size, flags);
1554 }
1555
1556 static struct xattr_handler gfs2_xattr_user_handler = {
1557         .prefix = XATTR_USER_PREFIX,
1558         .get    = gfs2_xattr_user_get,
1559         .set    = gfs2_xattr_user_set,
1560 };
1561
1562 static struct xattr_handler gfs2_xattr_security_handler = {
1563         .prefix = XATTR_SECURITY_PREFIX,
1564         .get    = gfs2_xattr_security_get,
1565         .set    = gfs2_xattr_security_set,
1566 };
1567
1568 struct xattr_handler *gfs2_xattr_handlers[] = {
1569         &gfs2_xattr_user_handler,
1570         &gfs2_xattr_security_handler,
1571         &gfs2_xattr_system_handler,
1572         NULL,
1573 };
1574