fs/gfs2/xattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <asm/uaccess.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include "glock.h"
  23 #include "inode.h"
  24 #include "meta_io.h"
  25 #include "quota.h"
  26 #include "rgrp.h"
  27 #include "trans.h"
  28 #include "util.h"
  29
  30 /**
  31  * ea_calc_size - returns the acutal number of bytes the request will take up
  32  *                (not counting any unstuffed data blocks)
  33  * @sdp:
  34  * @er:
  35  * @size:
  36  *
  37  * Returns: 1 if the EA should be stuffed
  38  */
  39
  40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  41                         unsigned int *size)
  42 {
  43         unsigned int jbsize = sdp->sd_jbsize;
  44
  45         /* Stuffed */
  46         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  47
  48         if (*size <= jbsize)
  49                 return 1;
  50
  51         /* Unstuffed */
  52         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  53                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  54
  55         return 0;
  56 }
  57
  58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  59 {
  60         unsigned int size;
  61
  62         if (dsize > GFS2_EA_MAX_DATA_LEN)
  63                 return -ERANGE;
  64
  65         ea_calc_size(sdp, nsize, dsize, &size);
  66
  67         /* This can only happen with 512 byte blocks */
  68         if (size > sdp->sd_jbsize)
  69                 return -ERANGE;
  70
  71         return 0;
  72 }
  73
  74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  75                           struct gfs2_ea_header *ea,
  76                           struct gfs2_ea_header *prev, void *private);
  77
  78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  79                         ea_call_t ea_call, void *data)
  80 {
  81         struct gfs2_ea_header *ea, *prev = NULL;
  82         int error = 0;
  83
  84         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  85                 return -EIO;
  86
  87         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  88                 if (!GFS2_EA_REC_LEN(ea))
  89                         goto fail;
  90                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  91                                                   bh->b_data + bh->b_size))
  92                         goto fail;
  93                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  94                         goto fail;
  95
  96                 error = ea_call(ip, bh, ea, prev, data);
  97                 if (error)
  98                         return error;
  99
 100                 if (GFS2_EA_IS_LAST(ea)) {
 101                         if ((char *)GFS2_EA2NEXT(ea) !=
 102                             bh->b_data + bh->b_size)
 103                                 goto fail;
 104                         break;
 105                 }
 106         }
 107
 108         return error;
 109
 110 fail:
 111         gfs2_consist_inode(ip);
 112         return -EIO;
 113 }
 114
 115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116 {
 117         struct buffer_head *bh, *eabh;
 118         __be64 *eablk, *end;
 119         int error;
 120
 121         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 122         if (error)
 123                 return error;
 124
 125         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 126                 error = ea_foreach_i(ip, bh, ea_call, data);
 127                 goto out;
 128         }
 129
 130         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 131                 error = -EIO;
 132                 goto out;
 133         }
 134
 135         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 136         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 137
 138         for (; eablk < end; eablk++) {
 139                 u64 bn;
 140
 141                 if (!*eablk)
 142                         break;
 143                 bn = be64_to_cpu(*eablk);
 144
 145                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 146                 if (error)
 147                         break;
 148                 error = ea_foreach_i(ip, eabh, ea_call, data);
 149                 brelse(eabh);
 150                 if (error)
 151                         break;
 152         }
 153 out:
 154         brelse(bh);
 155         return error;
 156 }
 157
 158 struct ea_find {
 159         int type;
 160         const char *name;
 161         size_t namel;
 162         struct gfs2_ea_location *ef_el;
 163 };
 164
 165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 166                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 167                      void *private)
 168 {
 169         struct ea_find *ef = private;
 170
 171         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 172                 return 0;
 173
 174         if (ea->ea_type == ef->type) {
 175                 if (ea->ea_name_len == ef->namel &&
 176                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 177                         struct gfs2_ea_location *el = ef->ef_el;
 178                         get_bh(bh);
 179                         el->el_bh = bh;
 180                         el->el_ea = ea;
 181                         el->el_prev = prev;
 182                         return 1;
 183                 }
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 190                         struct gfs2_ea_location *el)
 191 {
 192         struct ea_find ef;
 193         int error;
 194
 195         ef.type = type;
 196         ef.name = name;
 197         ef.namel = strlen(name);
 198         ef.ef_el = el;
 199
 200         memset(el, 0, sizeof(struct gfs2_ea_location));
 201
 202         error = ea_foreach(ip, ea_find_i, &ef);
 203         if (error > 0)
 204                 return 0;
 205
 206         return error;
 207 }
 208
 209 /**
 210  * ea_dealloc_unstuffed -
 211  * @ip:
 212  * @bh:
 213  * @ea:
 214  * @prev:
 215  * @private:
 216  *
 217  * Take advantage of the fact that all unstuffed blocks are
 218  * allocated from the same RG.  But watch, this may not always
 219  * be true.
 220  *
 221  * Returns: errno
 222  */
 223
 224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 225                                 struct gfs2_ea_header *ea,
 226                                 struct gfs2_ea_header *prev, void *private)
 227 {
 228         int *leave = private;
 229         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230         struct gfs2_rgrpd *rgd;
 231         struct gfs2_holder rg_gh;
 232         struct buffer_head *dibh;
 233         __be64 *dataptrs;
 234         u64 bn = 0;
 235         u64 bstart = 0;
 236         unsigned int blen = 0;
 237         unsigned int blks = 0;
 238         unsigned int x;
 239         int error;
 240
 241         error = gfs2_rindex_update(sdp);
 242         if (error)
 243                 return error;
 244
 245         if (GFS2_EA_IS_STUFFED(ea))
 246                 return 0;
 247
 248         dataptrs = GFS2_EA2DATAPTRS(ea);
 249         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 250                 if (*dataptrs) {
 251                         blks++;
 252                         bn = be64_to_cpu(*dataptrs);
 253                 }
 254         }
 255         if (!blks)
 256                 return 0;
 257
 258         rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 259         if (!rgd) {
 260                 gfs2_consist_inode(ip);
 261                 return -EIO;
 262         }
 263
 264         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 265         if (error)
 266                 return error;
 267
 268         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 269                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 270         if (error)
 271                 goto out_gunlock;
 272
 273         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 274
 275         dataptrs = GFS2_EA2DATAPTRS(ea);
 276         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 277                 if (!*dataptrs)
 278                         break;
 279                 bn = be64_to_cpu(*dataptrs);
 280
 281                 if (bstart + blen == bn)
 282                         blen++;
 283                 else {
 284                         if (bstart)
 285                                 gfs2_free_meta(ip, bstart, blen);
 286                         bstart = bn;
 287                         blen = 1;
 288                 }
 289
 290                 *dataptrs = 0;
 291                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 292         }
 293         if (bstart)
 294                 gfs2_free_meta(ip, bstart, blen);
 295
 296         if (prev && !leave) {
 297                 u32 len;
 298
 299                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 300                 prev->ea_rec_len = cpu_to_be32(len);
 301
 302                 if (GFS2_EA_IS_LAST(ea))
 303                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 304         } else {
 305                 ea->ea_type = GFS2_EATYPE_UNUSED;
 306                 ea->ea_num_ptrs = 0;
 307         }
 308
 309         error = gfs2_meta_inode_buffer(ip, &dibh);
 310         if (!error) {
 311                 ip->i_inode.i_ctime = CURRENT_TIME;
 312                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 313                 gfs2_dinode_out(ip, dibh->b_data);
 314                 brelse(dibh);
 315         }
 316
 317         gfs2_trans_end(sdp);
 318
 319 out_gunlock:
 320         gfs2_glock_dq_uninit(&rg_gh);
 321         return error;
 322 }
 323
 324 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 325                                struct gfs2_ea_header *ea,
 326                                struct gfs2_ea_header *prev, int leave)
 327 {
 328         struct gfs2_qadata *qa;
 329         int error;
 330
 331         qa = gfs2_qadata_get(ip);
 332         if (!qa)
 333                 return -ENOMEM;
 334
 335         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 336         if (error)
 337                 goto out_alloc;
 338
 339         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341         gfs2_quota_unhold(ip);
 342 out_alloc:
 343         gfs2_qadata_put(ip);
 344         return error;
 345 }
 346
 347 struct ea_list {
 348         struct gfs2_ea_request *ei_er;
 349         unsigned int ei_size;
 350 };
 351
 352 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 353 {
 354         switch (ea->ea_type) {
 355         case GFS2_EATYPE_USR:
 356                 return 5 + ea->ea_name_len + 1;
 357         case GFS2_EATYPE_SYS:
 358                 return 7 + ea->ea_name_len + 1;
 359         case GFS2_EATYPE_SECURITY:
 360                 return 9 + ea->ea_name_len + 1;
 361         default:
 362                 return 0;
 363         }
 364 }
 365
 366 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 367                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 368                      void *private)
 369 {
 370         struct ea_list *ei = private;
 371         struct gfs2_ea_request *er = ei->ei_er;
 372         unsigned int ea_size = gfs2_ea_strlen(ea);
 373
 374         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 375                 return 0;
 376
 377         if (er->er_data_len) {
 378                 char *prefix = NULL;
 379                 unsigned int l = 0;
 380                 char c = 0;
 381
 382                 if (ei->ei_size + ea_size > er->er_data_len)
 383                         return -ERANGE;
 384
 385                 switch (ea->ea_type) {
 386                 case GFS2_EATYPE_USR:
 387                         prefix = "user.";
 388                         l = 5;
 389                         break;
 390                 case GFS2_EATYPE_SYS:
 391                         prefix = "system.";
 392                         l = 7;
 393                         break;
 394                 case GFS2_EATYPE_SECURITY:
 395                         prefix = "security.";
 396                         l = 9;
 397                         break;
 398                 }
 399
 400                 BUG_ON(l == 0);
 401
 402                 memcpy(er->er_data + ei->ei_size, prefix, l);
 403                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 404                        ea->ea_name_len);
 405                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 406         }
 407
 408         ei->ei_size += ea_size;
 409
 410         return 0;
 411 }
 412
 413 /**
 414  * gfs2_listxattr - List gfs2 extended attributes
 415  * @dentry: The dentry whose inode we are interested in
 416  * @buffer: The buffer to write the results
 417  * @size: The size of the buffer
 418  *
 419  * Returns: actual size of data on success, -errno on error
 420  */
 421
 422 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 423 {
 424         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 425         struct gfs2_ea_request er;
 426         struct gfs2_holder i_gh;
 427         int error;
 428
 429         memset(&er, 0, sizeof(struct gfs2_ea_request));
 430         if (size) {
 431                 er.er_data = buffer;
 432                 er.er_data_len = size;
 433         }
 434
 435         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 436         if (error)
 437                 return error;
 438
 439         if (ip->i_eattr) {
 440                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 441
 442                 error = ea_foreach(ip, ea_list_i, &ei);
 443                 if (!error)
 444                         error = ei.ei_size;
 445         }
 446
 447         gfs2_glock_dq_uninit(&i_gh);
 448
 449         return error;
 450 }
 451
 452 /**
 453  * ea_get_unstuffed - actually copies the unstuffed data into the
 454  *                    request buffer
 455  * @ip: The GFS2 inode
 456  * @ea: The extended attribute header structure
 457  * @data: The data to be copied
 458  *
 459  * Returns: errno
 460  */
 461
 462 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 463                             char *data)
 464 {
 465         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 466         struct buffer_head **bh;
 467         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 468         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 469         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 470         unsigned int x;
 471         int error = 0;
 472
 473         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 474         if (!bh)
 475                 return -ENOMEM;
 476
 477         for (x = 0; x < nptrs; x++) {
 478                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 479                                        bh + x);
 480                 if (error) {
 481                         while (x--)
 482                                 brelse(bh[x]);
 483                         goto out;
 484                 }
 485                 dataptrs++;
 486         }
 487
 488         for (x = 0; x < nptrs; x++) {
 489                 error = gfs2_meta_wait(sdp, bh[x]);
 490                 if (error) {
 491                         for (; x < nptrs; x++)
 492                                 brelse(bh[x]);
 493                         goto out;
 494                 }
 495                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 496                         for (; x < nptrs; x++)
 497                                 brelse(bh[x]);
 498                         error = -EIO;
 499                         goto out;
 500                 }
 501
 502                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 503                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 504
 505                 amount -= sdp->sd_jbsize;
 506                 data += sdp->sd_jbsize;
 507
 508                 brelse(bh[x]);
 509         }
 510
 511 out:
 512         kfree(bh);
 513         return error;
 514 }
 515
 516 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 517                             char *data, size_t size)
 518 {
 519         int ret;
 520         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 521         if (len > size)
 522                 return -ERANGE;
 523
 524         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 525                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 526                 return len;
 527         }
 528         ret = ea_get_unstuffed(ip, el->el_ea, data);
 529         if (ret < 0)
 530                 return ret;
 531         return len;
 532 }
 533
 534 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 535 {
 536         struct gfs2_ea_location el;
 537         int error;
 538         int len;
 539         char *data;
 540
 541         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 542         if (error)
 543                 return error;
 544         if (!el.el_ea)
 545                 goto out;
 546         if (!GFS2_EA_DATA_LEN(el.el_ea))
 547                 goto out;
 548
 549         len = GFS2_EA_DATA_LEN(el.el_ea);
 550         data = kmalloc(len, GFP_NOFS);
 551         error = -ENOMEM;
 552         if (data == NULL)
 553                 goto out;
 554
 555         error = gfs2_ea_get_copy(ip, &el, data, len);
 556         if (error < 0)
 557                 kfree(data);
 558         else
 559                 *ppdata = data;
 560 out:
 561         brelse(el.el_bh);
 562         return error;
 563 }
 564
 565 /**
 566  * gfs2_xattr_get - Get a GFS2 extended attribute
 567  * @inode: The inode
 568  * @name: The name of the extended attribute
 569  * @buffer: The buffer to write the result into
 570  * @size: The size of the buffer
 571  * @type: The type of extended attribute
 572  *
 573  * Returns: actual size of data on success, -errno on error
 574  */
 575 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
 576                 void *buffer, size_t size, int type)
 577 {
 578         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 579         struct gfs2_ea_location el;
 580         int error;
 581
 582         if (!ip->i_eattr)
 583                 return -ENODATA;
 584         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 585                 return -EINVAL;
 586
 587         error = gfs2_ea_find(ip, type, name, &el);
 588         if (error)
 589                 return error;
 590         if (!el.el_ea)
 591                 return -ENODATA;
 592         if (size)
 593                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 594         else
 595                 error = GFS2_EA_DATA_LEN(el.el_ea);
 596         brelse(el.el_bh);
 597
 598         return error;
 599 }
 600
 601 /**
 602  * ea_alloc_blk - allocates a new block for extended attributes.
 603  * @ip: A pointer to the inode that's getting extended attributes
 604  * @bhp: Pointer to pointer to a struct buffer_head
 605  *
 606  * Returns: errno
 607  */
 608
 609 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 610 {
 611         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 612         struct gfs2_ea_header *ea;
 613         unsigned int n = 1;
 614         u64 block;
 615         int error;
 616
 617         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 618         if (error)
 619                 return error;
 620         gfs2_trans_add_unrevoke(sdp, block, 1);
 621         *bhp = gfs2_meta_new(ip->i_gl, block);
 622         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 623         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 624         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 625
 626         ea = GFS2_EA_BH2FIRST(*bhp);
 627         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 628         ea->ea_type = GFS2_EATYPE_UNUSED;
 629         ea->ea_flags = GFS2_EAFLAG_LAST;
 630         ea->ea_num_ptrs = 0;
 631
 632         gfs2_add_inode_blocks(&ip->i_inode, 1);
 633
 634         return 0;
 635 }
 636
 637 /**
 638  * ea_write - writes the request info to an ea, creating new blocks if
 639  *            necessary
 640  * @ip: inode that is being modified
 641  * @ea: the location of the new ea in a block
 642  * @er: the write request
 643  *
 644  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 645  *
 646  * returns : errno
 647  */
 648
 649 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 650                     struct gfs2_ea_request *er)
 651 {
 652         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 653         int error;
 654
 655         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 656         ea->ea_name_len = er->er_name_len;
 657         ea->ea_type = er->er_type;
 658         ea->__pad = 0;
 659
 660         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 661
 662         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 663                 ea->ea_num_ptrs = 0;
 664                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 665         } else {
 666                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 667                 const char *data = er->er_data;
 668                 unsigned int data_len = er->er_data_len;
 669                 unsigned int copy;
 670                 unsigned int x;
 671
 672                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 673                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 674                         struct buffer_head *bh;
 675                         u64 block;
 676                         int mh_size = sizeof(struct gfs2_meta_header);
 677                         unsigned int n = 1;
 678
 679                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 680                         if (error)
 681                                 return error;
 682                         gfs2_trans_add_unrevoke(sdp, block, 1);
 683                         bh = gfs2_meta_new(ip->i_gl, block);
 684                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 685                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 686
 687                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 688
 689                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 690                                                            data_len;
 691                         memcpy(bh->b_data + mh_size, data, copy);
 692                         if (copy < sdp->sd_jbsize)
 693                                 memset(bh->b_data + mh_size + copy, 0,
 694                                        sdp->sd_jbsize - copy);
 695
 696                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 697                         data += copy;
 698                         data_len -= copy;
 699
 700                         brelse(bh);
 701                 }
 702
 703                 gfs2_assert_withdraw(sdp, !data_len);
 704         }
 705
 706         return 0;
 707 }
 708
 709 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 710                                    struct gfs2_ea_request *er, void *private);
 711
 712 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 713                              unsigned int blks,
 714                              ea_skeleton_call_t skeleton_call, void *private)
 715 {
 716         struct gfs2_qadata *qa;
 717         struct buffer_head *dibh;
 718         int error;
 719
 720         qa = gfs2_qadata_get(ip);
 721         if (!qa)
 722                 return -ENOMEM;
 723
 724         error = gfs2_quota_lock_check(ip);
 725         if (error)
 726                 goto out;
 727
 728         error = gfs2_inplace_reserve(ip, blks);
 729         if (error)
 730                 goto out_gunlock_q;
 731
 732         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 733                                  blks + gfs2_rg_blocks(ip) +
 734                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 735         if (error)
 736                 goto out_ipres;
 737
 738         error = skeleton_call(ip, er, private);
 739         if (error)
 740                 goto out_end_trans;
 741
 742         error = gfs2_meta_inode_buffer(ip, &dibh);
 743         if (!error) {
 744                 ip->i_inode.i_ctime = CURRENT_TIME;
 745                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 746                 gfs2_dinode_out(ip, dibh->b_data);
 747                 brelse(dibh);
 748         }
 749
 750 out_end_trans:
 751         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 752 out_ipres:
 753         gfs2_inplace_release(ip);
 754 out_gunlock_q:
 755         gfs2_quota_unlock(ip);
 756 out:
 757         gfs2_qadata_put(ip);
 758         return error;
 759 }
 760
 761 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 762                      void *private)
 763 {
 764         struct buffer_head *bh;
 765         int error;
 766
 767         error = ea_alloc_blk(ip, &bh);
 768         if (error)
 769                 return error;
 770
 771         ip->i_eattr = bh->b_blocknr;
 772         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 773
 774         brelse(bh);
 775
 776         return error;
 777 }
 778
 779 /**
 780  * ea_init - initializes a new eattr block
 781  * @ip:
 782  * @er:
 783  *
 784  * Returns: errno
 785  */
 786
 787 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 788                    const void *data, size_t size)
 789 {
 790         struct gfs2_ea_request er;
 791         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 792         unsigned int blks = 1;
 793
 794         er.er_type = type;
 795         er.er_name = name;
 796         er.er_name_len = strlen(name);
 797         er.er_data = (void *)data;
 798         er.er_data_len = size;
 799
 800         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 801                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 802
 803         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 804 }
 805
 806 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 807 {
 808         u32 ea_size = GFS2_EA_SIZE(ea);
 809         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 810                                      ea_size);
 811         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 812         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 813
 814         ea->ea_rec_len = cpu_to_be32(ea_size);
 815         ea->ea_flags ^= last;
 816
 817         new->ea_rec_len = cpu_to_be32(new_size);
 818         new->ea_flags = last;
 819
 820         return new;
 821 }
 822
 823 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 824                                   struct gfs2_ea_location *el)
 825 {
 826         struct gfs2_ea_header *ea = el->el_ea;
 827         struct gfs2_ea_header *prev = el->el_prev;
 828         u32 len;
 829
 830         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 831
 832         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 833                 ea->ea_type = GFS2_EATYPE_UNUSED;
 834                 return;
 835         } else if (GFS2_EA2NEXT(prev) != ea) {
 836                 prev = GFS2_EA2NEXT(prev);
 837                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 838         }
 839
 840         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 841         prev->ea_rec_len = cpu_to_be32(len);
 842
 843         if (GFS2_EA_IS_LAST(ea))
 844                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 845 }
 846
 847 struct ea_set {
 848         int ea_split;
 849
 850         struct gfs2_ea_request *es_er;
 851         struct gfs2_ea_location *es_el;
 852
 853         struct buffer_head *es_bh;
 854         struct gfs2_ea_header *es_ea;
 855 };
 856
 857 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 858                                  struct gfs2_ea_header *ea, struct ea_set *es)
 859 {
 860         struct gfs2_ea_request *er = es->es_er;
 861         struct buffer_head *dibh;
 862         int error;
 863
 864         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 865         if (error)
 866                 return error;
 867
 868         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 869
 870         if (es->ea_split)
 871                 ea = ea_split_ea(ea);
 872
 873         ea_write(ip, ea, er);
 874
 875         if (es->es_el)
 876                 ea_set_remove_stuffed(ip, es->es_el);
 877
 878         error = gfs2_meta_inode_buffer(ip, &dibh);
 879         if (error)
 880                 goto out;
 881         ip->i_inode.i_ctime = CURRENT_TIME;
 882         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 883         gfs2_dinode_out(ip, dibh->b_data);
 884         brelse(dibh);
 885 out:
 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_bh(ip->i_gl, es->es_bh, 1);
 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,
 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_bh(ip->i_gl, indbh, 1);
 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_add_unrevoke(sdp, blk, 1);
1001                 indbh = gfs2_meta_new(ip->i_gl, blk);
1002                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
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         struct buffer_head *dibh;
1082         int error;
1083
1084         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1085         if (error)
1086                 return error;
1087
1088         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1089
1090         if (prev) {
1091                 u32 len;
1092
1093                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1094                 prev->ea_rec_len = cpu_to_be32(len);
1095
1096                 if (GFS2_EA_IS_LAST(ea))
1097                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1098         } else {
1099                 ea->ea_type = GFS2_EATYPE_UNUSED;
1100         }
1101
1102         error = gfs2_meta_inode_buffer(ip, &dibh);
1103         if (!error) {
1104                 ip->i_inode.i_ctime = CURRENT_TIME;
1105                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1106                 gfs2_dinode_out(ip, dibh->b_data);
1107                 brelse(dibh);
1108         }
1109
1110         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1111
1112         return error;
1113 }
1114
1115 /**
1116  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1117  * @ip: The inode
1118  * @type: The type of the extended attribute
1119  * @name: The name of the extended attribute
1120  *
1121  * This is not called directly by the VFS since we use the (common)
1122  * scheme of making a "set with NULL data" mean a remove request. Note
1123  * that this is different from a set with zero length data.
1124  *
1125  * Returns: 0, or errno on failure
1126  */
1127
1128 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1129 {
1130         struct gfs2_ea_location el;
1131         int error;
1132
1133         if (!ip->i_eattr)
1134                 return -ENODATA;
1135
1136         error = gfs2_ea_find(ip, type, name, &el);
1137         if (error)
1138                 return error;
1139         if (!el.el_ea)
1140                 return -ENODATA;
1141
1142         if (GFS2_EA_IS_STUFFED(el.el_ea))
1143                 error = ea_remove_stuffed(ip, &el);
1144         else
1145                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1146
1147         brelse(el.el_bh);
1148
1149         return error;
1150 }
1151
1152 /**
1153  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1154  * @ip: The inode
1155  * @name: The name of the extended attribute
1156  * @value: The value of the extended attribute (NULL for remove)
1157  * @size: The size of the @value argument
1158  * @flags: Create or Replace
1159  * @type: The type of the extended attribute
1160  *
1161  * See gfs2_xattr_remove() for details of the removal of xattrs.
1162  *
1163  * Returns: 0 or errno on failure
1164  */
1165
1166 int __gfs2_xattr_set(struct inode *inode, const char *name,
1167                    const void *value, size_t size, int flags, int type)
1168 {
1169         struct gfs2_inode *ip = GFS2_I(inode);
1170         struct gfs2_sbd *sdp = GFS2_SB(inode);
1171         struct gfs2_ea_location el;
1172         unsigned int namel = strlen(name);
1173         int error;
1174
1175         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1176                 return -EPERM;
1177         if (namel > GFS2_EA_MAX_NAME_LEN)
1178                 return -ERANGE;
1179
1180         if (value == NULL)
1181                 return gfs2_xattr_remove(ip, type, name);
1182
1183         if (ea_check_size(sdp, namel, size))
1184                 return -ERANGE;
1185
1186         if (!ip->i_eattr) {
1187                 if (flags & XATTR_REPLACE)
1188                         return -ENODATA;
1189                 return ea_init(ip, type, name, value, size);
1190         }
1191
1192         error = gfs2_ea_find(ip, type, name, &el);
1193         if (error)
1194                 return error;
1195
1196         if (el.el_ea) {
1197                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1198                         brelse(el.el_bh);
1199                         return -EPERM;
1200                 }
1201
1202                 error = -EEXIST;
1203                 if (!(flags & XATTR_CREATE)) {
1204                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1205                         error = ea_set_i(ip, type, name, value, size, &el);
1206                         if (!error && unstuffed)
1207                                 ea_set_remove_unstuffed(ip, &el);
1208                 }
1209
1210                 brelse(el.el_bh);
1211                 return error;
1212         }
1213
1214         error = -ENODATA;
1215         if (!(flags & XATTR_REPLACE))
1216                 error = ea_set_i(ip, type, name, value, size, NULL);
1217
1218         return error;
1219 }
1220
1221 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1222                 const void *value, size_t size, int flags, int type)
1223 {
1224         return __gfs2_xattr_set(dentry->d_inode, name, value,
1225                                 size, flags, type);
1226 }
1227
1228 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1229                                   struct gfs2_ea_header *ea, char *data)
1230 {
1231         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1232         struct buffer_head **bh;
1233         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1234         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1235         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1236         unsigned int x;
1237         int error;
1238
1239         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1240         if (!bh)
1241                 return -ENOMEM;
1242
1243         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1244         if (error)
1245                 goto out;
1246
1247         for (x = 0; x < nptrs; x++) {
1248                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1249                                        bh + x);
1250                 if (error) {
1251                         while (x--)
1252                                 brelse(bh[x]);
1253                         goto fail;
1254                 }
1255                 dataptrs++;
1256         }
1257
1258         for (x = 0; x < nptrs; x++) {
1259                 error = gfs2_meta_wait(sdp, bh[x]);
1260                 if (error) {
1261                         for (; x < nptrs; x++)
1262                                 brelse(bh[x]);
1263                         goto fail;
1264                 }
1265                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1266                         for (; x < nptrs; x++)
1267                                 brelse(bh[x]);
1268                         error = -EIO;
1269                         goto fail;
1270                 }
1271
1272                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1273
1274                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1275                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1276
1277                 amount -= sdp->sd_jbsize;
1278                 data += sdp->sd_jbsize;
1279
1280                 brelse(bh[x]);
1281         }
1282
1283 out:
1284         kfree(bh);
1285         return error;
1286
1287 fail:
1288         gfs2_trans_end(sdp);
1289         kfree(bh);
1290         return error;
1291 }
1292
1293 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1294 {
1295         struct inode *inode = &ip->i_inode;
1296         struct gfs2_sbd *sdp = GFS2_SB(inode);
1297         struct gfs2_ea_location el;
1298         int error;
1299
1300         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1301         if (error)
1302                 return error;
1303
1304         if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1305                 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1306                 if (error == 0) {
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                 }
1311         } else {
1312                 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1313         }
1314
1315         brelse(el.el_bh);
1316         if (error)
1317                 return error;
1318
1319         error = gfs2_setattr_simple(inode, attr);
1320         gfs2_trans_end(sdp);
1321         return error;
1322 }
1323
1324 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1325 {
1326         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1327         struct gfs2_rgrp_list rlist;
1328         struct buffer_head *indbh, *dibh;
1329         __be64 *eablk, *end;
1330         unsigned int rg_blocks = 0;
1331         u64 bstart = 0;
1332         unsigned int blen = 0;
1333         unsigned int blks = 0;
1334         unsigned int x;
1335         int error;
1336
1337         error = gfs2_rindex_update(sdp);
1338         if (error)
1339                 return error;
1340
1341         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1342
1343         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1344         if (error)
1345                 return error;
1346
1347         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1348                 error = -EIO;
1349                 goto out;
1350         }
1351
1352         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1353         end = eablk + sdp->sd_inptrs;
1354
1355         for (; eablk < end; eablk++) {
1356                 u64 bn;
1357
1358                 if (!*eablk)
1359                         break;
1360                 bn = be64_to_cpu(*eablk);
1361
1362                 if (bstart + blen == bn)
1363                         blen++;
1364                 else {
1365                         if (bstart)
1366                                 gfs2_rlist_add(ip, &rlist, bstart);
1367                         bstart = bn;
1368                         blen = 1;
1369                 }
1370                 blks++;
1371         }
1372         if (bstart)
1373                 gfs2_rlist_add(ip, &rlist, bstart);
1374         else
1375                 goto out;
1376
1377         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1378
1379         for (x = 0; x < rlist.rl_rgrps; x++) {
1380                 struct gfs2_rgrpd *rgd;
1381                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1382                 rg_blocks += rgd->rd_length;
1383         }
1384
1385         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1386         if (error)
1387                 goto out_rlist_free;
1388
1389         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1390                                  RES_STATFS + RES_QUOTA, blks);
1391         if (error)
1392                 goto out_gunlock;
1393
1394         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1395
1396         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1397         bstart = 0;
1398         blen = 0;
1399
1400         for (; eablk < end; eablk++) {
1401                 u64 bn;
1402
1403                 if (!*eablk)
1404                         break;
1405                 bn = be64_to_cpu(*eablk);
1406
1407                 if (bstart + blen == bn)
1408                         blen++;
1409                 else {
1410                         if (bstart)
1411                                 gfs2_free_meta(ip, bstart, blen);
1412                         bstart = bn;
1413                         blen = 1;
1414                 }
1415
1416                 *eablk = 0;
1417                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1418         }
1419         if (bstart)
1420                 gfs2_free_meta(ip, bstart, blen);
1421
1422         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1423
1424         error = gfs2_meta_inode_buffer(ip, &dibh);
1425         if (!error) {
1426                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1427                 gfs2_dinode_out(ip, dibh->b_data);
1428                 brelse(dibh);
1429         }
1430
1431         gfs2_trans_end(sdp);
1432
1433 out_gunlock:
1434         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1435 out_rlist_free:
1436         gfs2_rlist_free(&rlist);
1437 out:
1438         brelse(indbh);
1439         return error;
1440 }
1441
1442 static int ea_dealloc_block(struct gfs2_inode *ip)
1443 {
1444         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1445         struct gfs2_rgrpd *rgd;
1446         struct buffer_head *dibh;
1447         struct gfs2_holder gh;
1448         int error;
1449
1450         error = gfs2_rindex_update(sdp);
1451         if (error)
1452                 return error;
1453
1454         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1455         if (!rgd) {
1456                 gfs2_consist_inode(ip);
1457                 return -EIO;
1458         }
1459
1460         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1461         if (error)
1462                 return error;
1463
1464         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1465                                  RES_QUOTA, 1);
1466         if (error)
1467                 goto out_gunlock;
1468
1469         gfs2_free_meta(ip, ip->i_eattr, 1);
1470
1471         ip->i_eattr = 0;
1472         gfs2_add_inode_blocks(&ip->i_inode, -1);
1473
1474         error = gfs2_meta_inode_buffer(ip, &dibh);
1475         if (!error) {
1476                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1477                 gfs2_dinode_out(ip, dibh->b_data);
1478                 brelse(dibh);
1479         }
1480
1481         gfs2_trans_end(sdp);
1482
1483 out_gunlock:
1484         gfs2_glock_dq_uninit(&gh);
1485         return error;
1486 }
1487
1488 /**
1489  * gfs2_ea_dealloc - deallocate the extended attribute fork
1490  * @ip: the inode
1491  *
1492  * Returns: errno
1493  */
1494
1495 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1496 {
1497         struct gfs2_qadata *qa;
1498         int error;
1499
1500         qa = gfs2_qadata_get(ip);
1501         if (!qa)
1502                 return -ENOMEM;
1503
1504         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1505         if (error)
1506                 goto out_alloc;
1507
1508         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1509         if (error)
1510                 goto out_quota;
1511
1512         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1513                 error = ea_dealloc_indirect(ip);
1514                 if (error)
1515                         goto out_quota;
1516         }
1517
1518         error = ea_dealloc_block(ip);
1519
1520 out_quota:
1521         gfs2_quota_unhold(ip);
1522 out_alloc:
1523         gfs2_qadata_put(ip);
1524         return error;
1525 }
1526
1527 static const struct xattr_handler gfs2_xattr_user_handler = {
1528         .prefix = XATTR_USER_PREFIX,
1529         .flags  = GFS2_EATYPE_USR,
1530         .get    = gfs2_xattr_get,
1531         .set    = gfs2_xattr_set,
1532 };
1533
1534 static const struct xattr_handler gfs2_xattr_security_handler = {
1535         .prefix = XATTR_SECURITY_PREFIX,
1536         .flags  = GFS2_EATYPE_SECURITY,
1537         .get    = gfs2_xattr_get,
1538         .set    = gfs2_xattr_set,
1539 };
1540
1541 const struct xattr_handler *gfs2_xattr_handlers[] = {
1542         &gfs2_xattr_user_handler,
1543         &gfs2_xattr_security_handler,
1544         &gfs2_xattr_system_handler,
1545         NULL,
1546 };
1547