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_qadata *qa;
 325         int error;
 326
 327         qa = gfs2_qadata_get(ip);
 328         if (!qa)
 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 = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 336
 337         gfs2_quota_unhold(ip);
 338 out_alloc:
 339         gfs2_qadata_put(ip);
 340         return error;
 341 }
 342
 343 struct ea_list {
 344         struct gfs2_ea_request *ei_er;
 345         unsigned int ei_size;
 346 };
 347
 348 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 349 {
 350         switch (ea->ea_type) {
 351         case GFS2_EATYPE_USR:
 352                 return 5 + ea->ea_name_len + 1;
 353         case GFS2_EATYPE_SYS:
 354                 return 7 + ea->ea_name_len + 1;
 355         case GFS2_EATYPE_SECURITY:
 356                 return 9 + ea->ea_name_len + 1;
 357         default:
 358                 return 0;
 359         }
 360 }
 361
 362 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 363                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 364                      void *private)
 365 {
 366         struct ea_list *ei = private;
 367         struct gfs2_ea_request *er = ei->ei_er;
 368         unsigned int ea_size = gfs2_ea_strlen(ea);
 369
 370         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 371                 return 0;
 372
 373         if (er->er_data_len) {
 374                 char *prefix = NULL;
 375                 unsigned int l = 0;
 376                 char c = 0;
 377
 378                 if (ei->ei_size + ea_size > er->er_data_len)
 379                         return -ERANGE;
 380
 381                 switch (ea->ea_type) {
 382                 case GFS2_EATYPE_USR:
 383                         prefix = "user.";
 384                         l = 5;
 385                         break;
 386                 case GFS2_EATYPE_SYS:
 387                         prefix = "system.";
 388                         l = 7;
 389                         break;
 390                 case GFS2_EATYPE_SECURITY:
 391                         prefix = "security.";
 392                         l = 9;
 393                         break;
 394                 }
 395
 396                 BUG_ON(l == 0);
 397
 398                 memcpy(er->er_data + ei->ei_size, prefix, l);
 399                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 400                        ea->ea_name_len);
 401                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 402         }
 403
 404         ei->ei_size += ea_size;
 405
 406         return 0;
 407 }
 408
 409 /**
 410  * gfs2_listxattr - List gfs2 extended attributes
 411  * @dentry: The dentry whose inode we are interested in
 412  * @buffer: The buffer to write the results
 413  * @size: The size of the buffer
 414  *
 415  * Returns: actual size of data on success, -errno on error
 416  */
 417
 418 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 419 {
 420         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 421         struct gfs2_ea_request er;
 422         struct gfs2_holder i_gh;
 423         int error;
 424
 425         memset(&er, 0, sizeof(struct gfs2_ea_request));
 426         if (size) {
 427                 er.er_data = buffer;
 428                 er.er_data_len = size;
 429         }
 430
 431         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 432         if (error)
 433                 return error;
 434
 435         if (ip->i_eattr) {
 436                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 437
 438                 error = ea_foreach(ip, ea_list_i, &ei);
 439                 if (!error)
 440                         error = ei.ei_size;
 441         }
 442
 443         gfs2_glock_dq_uninit(&i_gh);
 444
 445         return error;
 446 }
 447
 448 /**
 449  * ea_get_unstuffed - actually copies the unstuffed data into the
 450  *                    request buffer
 451  * @ip: The GFS2 inode
 452  * @ea: The extended attribute header structure
 453  * @data: The data to be copied
 454  *
 455  * Returns: errno
 456  */
 457
 458 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 459                             char *data)
 460 {
 461         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 462         struct buffer_head **bh;
 463         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 464         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 465         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 466         unsigned int x;
 467         int error = 0;
 468
 469         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 470         if (!bh)
 471                 return -ENOMEM;
 472
 473         for (x = 0; x < nptrs; x++) {
 474                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 475                                        bh + x);
 476                 if (error) {
 477                         while (x--)
 478                                 brelse(bh[x]);
 479                         goto out;
 480                 }
 481                 dataptrs++;
 482         }
 483
 484         for (x = 0; x < nptrs; x++) {
 485                 error = gfs2_meta_wait(sdp, bh[x]);
 486                 if (error) {
 487                         for (; x < nptrs; x++)
 488                                 brelse(bh[x]);
 489                         goto out;
 490                 }
 491                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 492                         for (; x < nptrs; x++)
 493                                 brelse(bh[x]);
 494                         error = -EIO;
 495                         goto out;
 496                 }
 497
 498                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 499                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 500
 501                 amount -= sdp->sd_jbsize;
 502                 data += sdp->sd_jbsize;
 503
 504                 brelse(bh[x]);
 505         }
 506
 507 out:
 508         kfree(bh);
 509         return error;
 510 }
 511
 512 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 513                             char *data, size_t size)
 514 {
 515         int ret;
 516         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 517         if (len > size)
 518                 return -ERANGE;
 519
 520         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 521                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 522                 return len;
 523         }
 524         ret = ea_get_unstuffed(ip, el->el_ea, data);
 525         if (ret < 0)
 526                 return ret;
 527         return len;
 528 }
 529
 530 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 531 {
 532         struct gfs2_ea_location el;
 533         int error;
 534         int len;
 535         char *data;
 536
 537         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 538         if (error)
 539                 return error;
 540         if (!el.el_ea)
 541                 goto out;
 542         if (!GFS2_EA_DATA_LEN(el.el_ea))
 543                 goto out;
 544
 545         len = GFS2_EA_DATA_LEN(el.el_ea);
 546         data = kmalloc(len, GFP_NOFS);
 547         error = -ENOMEM;
 548         if (data == NULL)
 549                 goto out;
 550
 551         error = gfs2_ea_get_copy(ip, &el, data, len);
 552         if (error < 0)
 553                 kfree(data);
 554         else
 555                 *ppdata = data;
 556 out:
 557         brelse(el.el_bh);
 558         return error;
 559 }
 560
 561 /**
 562  * gfs2_xattr_get - Get a GFS2 extended attribute
 563  * @inode: The inode
 564  * @name: The name of the extended attribute
 565  * @buffer: The buffer to write the result into
 566  * @size: The size of the buffer
 567  * @type: The type of extended attribute
 568  *
 569  * Returns: actual size of data on success, -errno on error
 570  */
 571 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
 572                 void *buffer, size_t size, int type)
 573 {
 574         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 575         struct gfs2_ea_location el;
 576         int error;
 577
 578         if (!ip->i_eattr)
 579                 return -ENODATA;
 580         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 581                 return -EINVAL;
 582
 583         error = gfs2_ea_find(ip, type, name, &el);
 584         if (error)
 585                 return error;
 586         if (!el.el_ea)
 587                 return -ENODATA;
 588         if (size)
 589                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 590         else
 591                 error = GFS2_EA_DATA_LEN(el.el_ea);
 592         brelse(el.el_bh);
 593
 594         return error;
 595 }
 596
 597 /**
 598  * ea_alloc_blk - allocates a new block for extended attributes.
 599  * @ip: A pointer to the inode that's getting extended attributes
 600  * @bhp: Pointer to pointer to a struct buffer_head
 601  *
 602  * Returns: errno
 603  */
 604
 605 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 606 {
 607         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 608         struct gfs2_ea_header *ea;
 609         unsigned int n = 1;
 610         u64 block;
 611         int error;
 612
 613         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 614         if (error)
 615                 return error;
 616         gfs2_trans_add_unrevoke(sdp, block, 1);
 617         *bhp = gfs2_meta_new(ip->i_gl, block);
 618         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 619         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 620         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 621
 622         ea = GFS2_EA_BH2FIRST(*bhp);
 623         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 624         ea->ea_type = GFS2_EATYPE_UNUSED;
 625         ea->ea_flags = GFS2_EAFLAG_LAST;
 626         ea->ea_num_ptrs = 0;
 627
 628         gfs2_add_inode_blocks(&ip->i_inode, 1);
 629
 630         return 0;
 631 }
 632
 633 /**
 634  * ea_write - writes the request info to an ea, creating new blocks if
 635  *            necessary
 636  * @ip: inode that is being modified
 637  * @ea: the location of the new ea in a block
 638  * @er: the write request
 639  *
 640  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 641  *
 642  * returns : errno
 643  */
 644
 645 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 646                     struct gfs2_ea_request *er)
 647 {
 648         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 649         int error;
 650
 651         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 652         ea->ea_name_len = er->er_name_len;
 653         ea->ea_type = er->er_type;
 654         ea->__pad = 0;
 655
 656         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 657
 658         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 659                 ea->ea_num_ptrs = 0;
 660                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 661         } else {
 662                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 663                 const char *data = er->er_data;
 664                 unsigned int data_len = er->er_data_len;
 665                 unsigned int copy;
 666                 unsigned int x;
 667
 668                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 669                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 670                         struct buffer_head *bh;
 671                         u64 block;
 672                         int mh_size = sizeof(struct gfs2_meta_header);
 673                         unsigned int n = 1;
 674
 675                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 676                         if (error)
 677                                 return error;
 678                         gfs2_trans_add_unrevoke(sdp, block, 1);
 679                         bh = gfs2_meta_new(ip->i_gl, block);
 680                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 681                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 682
 683                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 684
 685                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 686                                                            data_len;
 687                         memcpy(bh->b_data + mh_size, data, copy);
 688                         if (copy < sdp->sd_jbsize)
 689                                 memset(bh->b_data + mh_size + copy, 0,
 690                                        sdp->sd_jbsize - copy);
 691
 692                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 693                         data += copy;
 694                         data_len -= copy;
 695
 696                         brelse(bh);
 697                 }
 698
 699                 gfs2_assert_withdraw(sdp, !data_len);
 700         }
 701
 702         return 0;
 703 }
 704
 705 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 706                                    struct gfs2_ea_request *er, void *private);
 707
 708 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 709                              unsigned int blks,
 710                              ea_skeleton_call_t skeleton_call, void *private)
 711 {
 712         struct gfs2_qadata *qa;
 713         struct buffer_head *dibh;
 714         int error;
 715
 716         qa = gfs2_qadata_get(ip);
 717         if (!qa)
 718                 return -ENOMEM;
 719
 720         error = gfs2_quota_lock_check(ip);
 721         if (error)
 722                 goto out;
 723
 724         error = gfs2_inplace_reserve(ip, blks);
 725         if (error)
 726                 goto out_gunlock_q;
 727
 728         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 729                                  blks + gfs2_rg_blocks(ip) +
 730                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 731         if (error)
 732                 goto out_ipres;
 733
 734         error = skeleton_call(ip, er, private);
 735         if (error)
 736                 goto out_end_trans;
 737
 738         error = gfs2_meta_inode_buffer(ip, &dibh);
 739         if (!error) {
 740                 ip->i_inode.i_ctime = CURRENT_TIME;
 741                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 742                 gfs2_dinode_out(ip, dibh->b_data);
 743                 brelse(dibh);
 744         }
 745
 746 out_end_trans:
 747         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 748 out_ipres:
 749         gfs2_inplace_release(ip);
 750 out_gunlock_q:
 751         gfs2_quota_unlock(ip);
 752 out:
 753         gfs2_qadata_put(ip);
 754         return error;
 755 }
 756
 757 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 758                      void *private)
 759 {
 760         struct buffer_head *bh;
 761         int error;
 762
 763         error = ea_alloc_blk(ip, &bh);
 764         if (error)
 765                 return error;
 766
 767         ip->i_eattr = bh->b_blocknr;
 768         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 769
 770         brelse(bh);
 771
 772         return error;
 773 }
 774
 775 /**
 776  * ea_init - initializes a new eattr block
 777  * @ip:
 778  * @er:
 779  *
 780  * Returns: errno
 781  */
 782
 783 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 784                    const void *data, size_t size)
 785 {
 786         struct gfs2_ea_request er;
 787         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 788         unsigned int blks = 1;
 789
 790         er.er_type = type;
 791         er.er_name = name;
 792         er.er_name_len = strlen(name);
 793         er.er_data = (void *)data;
 794         er.er_data_len = size;
 795
 796         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 797                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 798
 799         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 800 }
 801
 802 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 803 {
 804         u32 ea_size = GFS2_EA_SIZE(ea);
 805         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 806                                      ea_size);
 807         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 808         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 809
 810         ea->ea_rec_len = cpu_to_be32(ea_size);
 811         ea->ea_flags ^= last;
 812
 813         new->ea_rec_len = cpu_to_be32(new_size);
 814         new->ea_flags = last;
 815
 816         return new;
 817 }
 818
 819 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 820                                   struct gfs2_ea_location *el)
 821 {
 822         struct gfs2_ea_header *ea = el->el_ea;
 823         struct gfs2_ea_header *prev = el->el_prev;
 824         u32 len;
 825
 826         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 827
 828         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 829                 ea->ea_type = GFS2_EATYPE_UNUSED;
 830                 return;
 831         } else if (GFS2_EA2NEXT(prev) != ea) {
 832                 prev = GFS2_EA2NEXT(prev);
 833                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 834         }
 835
 836         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 837         prev->ea_rec_len = cpu_to_be32(len);
 838
 839         if (GFS2_EA_IS_LAST(ea))
 840                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 841 }
 842
 843 struct ea_set {
 844         int ea_split;
 845
 846         struct gfs2_ea_request *es_er;
 847         struct gfs2_ea_location *es_el;
 848
 849         struct buffer_head *es_bh;
 850         struct gfs2_ea_header *es_ea;
 851 };
 852
 853 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 854                                  struct gfs2_ea_header *ea, struct ea_set *es)
 855 {
 856         struct gfs2_ea_request *er = es->es_er;
 857         struct buffer_head *dibh;
 858         int error;
 859
 860         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 861         if (error)
 862                 return error;
 863
 864         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 865
 866         if (es->ea_split)
 867                 ea = ea_split_ea(ea);
 868
 869         ea_write(ip, ea, er);
 870
 871         if (es->es_el)
 872                 ea_set_remove_stuffed(ip, es->es_el);
 873
 874         error = gfs2_meta_inode_buffer(ip, &dibh);
 875         if (error)
 876                 goto out;
 877         ip->i_inode.i_ctime = CURRENT_TIME;
 878         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 879         gfs2_dinode_out(ip, dibh->b_data);
 880         brelse(dibh);
 881 out:
 882         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 883         return error;
 884 }
 885
 886 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 887                                struct gfs2_ea_request *er, void *private)
 888 {
 889         struct ea_set *es = private;
 890         struct gfs2_ea_header *ea = es->es_ea;
 891         int error;
 892
 893         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 894
 895         if (es->ea_split)
 896                 ea = ea_split_ea(ea);
 897
 898         error = ea_write(ip, ea, er);
 899         if (error)
 900                 return error;
 901
 902         if (es->es_el)
 903                 ea_set_remove_stuffed(ip, es->es_el);
 904
 905         return 0;
 906 }
 907
 908 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 909                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 910                          void *private)
 911 {
 912         struct ea_set *es = private;
 913         unsigned int size;
 914         int stuffed;
 915         int error;
 916
 917         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 918                                es->es_er->er_data_len, &size);
 919
 920         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 921                 if (GFS2_EA_REC_LEN(ea) < size)
 922                         return 0;
 923                 if (!GFS2_EA_IS_STUFFED(ea)) {
 924                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 925                         if (error)
 926                                 return error;
 927                 }
 928                 es->ea_split = 0;
 929         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 930                 es->ea_split = 1;
 931         else
 932                 return 0;
 933
 934         if (stuffed) {
 935                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 936                 if (error)
 937                         return error;
 938         } else {
 939                 unsigned int blks;
 940
 941                 es->es_bh = bh;
 942                 es->es_ea = ea;
 943                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 944                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 945
 946                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 947                                           ea_set_simple_alloc, es);
 948                 if (error)
 949                         return error;
 950         }
 951
 952         return 1;
 953 }
 954
 955 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 956                         void *private)
 957 {
 958         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 959         struct buffer_head *indbh, *newbh;
 960         __be64 *eablk;
 961         int error;
 962         int mh_size = sizeof(struct gfs2_meta_header);
 963
 964         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 965                 __be64 *end;
 966
 967                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 968                                        &indbh);
 969                 if (error)
 970                         return error;
 971
 972                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 973                         error = -EIO;
 974                         goto out;
 975                 }
 976
 977                 eablk = (__be64 *)(indbh->b_data + mh_size);
 978                 end = eablk + sdp->sd_inptrs;
 979
 980                 for (; eablk < end; eablk++)
 981                         if (!*eablk)
 982                                 break;
 983
 984                 if (eablk == end) {
 985                         error = -ENOSPC;
 986                         goto out;
 987                 }
 988
 989                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 990         } else {
 991                 u64 blk;
 992                 unsigned int n = 1;
 993                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
 994                 if (error)
 995                         return error;
 996                 gfs2_trans_add_unrevoke(sdp, blk, 1);
 997                 indbh = gfs2_meta_new(ip->i_gl, blk);
 998                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 999                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1000                 gfs2_buffer_clear_tail(indbh, mh_size);
1001
1002                 eablk = (__be64 *)(indbh->b_data + mh_size);
1003                 *eablk = cpu_to_be64(ip->i_eattr);
1004                 ip->i_eattr = blk;
1005                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1006                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1007
1008                 eablk++;
1009         }
1010
1011         error = ea_alloc_blk(ip, &newbh);
1012         if (error)
1013                 goto out;
1014
1015         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1016         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1017         brelse(newbh);
1018         if (error)
1019                 goto out;
1020
1021         if (private)
1022                 ea_set_remove_stuffed(ip, private);
1023
1024 out:
1025         brelse(indbh);
1026         return error;
1027 }
1028
1029 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1030                     const void *value, size_t size, struct gfs2_ea_location *el)
1031 {
1032         struct gfs2_ea_request er;
1033         struct ea_set es;
1034         unsigned int blks = 2;
1035         int error;
1036
1037         er.er_type = type;
1038         er.er_name = name;
1039         er.er_data = (void *)value;
1040         er.er_name_len = strlen(name);
1041         er.er_data_len = size;
1042
1043         memset(&es, 0, sizeof(struct ea_set));
1044         es.es_er = &er;
1045         es.es_el = el;
1046
1047         error = ea_foreach(ip, ea_set_simple, &es);
1048         if (error > 0)
1049                 return 0;
1050         if (error)
1051                 return error;
1052
1053         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1054                 blks++;
1055         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1056                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1057
1058         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1059 }
1060
1061 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1062                                    struct gfs2_ea_location *el)
1063 {
1064         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1065                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1066                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1067                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1068         }
1069
1070         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1071 }
1072
1073 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1074 {
1075         struct gfs2_ea_header *ea = el->el_ea;
1076         struct gfs2_ea_header *prev = el->el_prev;
1077         struct buffer_head *dibh;
1078         int error;
1079
1080         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1081         if (error)
1082                 return error;
1083
1084         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1085
1086         if (prev) {
1087                 u32 len;
1088
1089                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1090                 prev->ea_rec_len = cpu_to_be32(len);
1091
1092                 if (GFS2_EA_IS_LAST(ea))
1093                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1094         } else {
1095                 ea->ea_type = GFS2_EATYPE_UNUSED;
1096         }
1097
1098         error = gfs2_meta_inode_buffer(ip, &dibh);
1099         if (!error) {
1100                 ip->i_inode.i_ctime = CURRENT_TIME;
1101                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1102                 gfs2_dinode_out(ip, dibh->b_data);
1103                 brelse(dibh);
1104         }
1105
1106         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1107
1108         return error;
1109 }
1110
1111 /**
1112  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1113  * @ip: The inode
1114  * @type: The type of the extended attribute
1115  * @name: The name of the extended attribute
1116  *
1117  * This is not called directly by the VFS since we use the (common)
1118  * scheme of making a "set with NULL data" mean a remove request. Note
1119  * that this is different from a set with zero length data.
1120  *
1121  * Returns: 0, or errno on failure
1122  */
1123
1124 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1125 {
1126         struct gfs2_ea_location el;
1127         int error;
1128
1129         if (!ip->i_eattr)
1130                 return -ENODATA;
1131
1132         error = gfs2_ea_find(ip, type, name, &el);
1133         if (error)
1134                 return error;
1135         if (!el.el_ea)
1136                 return -ENODATA;
1137
1138         if (GFS2_EA_IS_STUFFED(el.el_ea))
1139                 error = ea_remove_stuffed(ip, &el);
1140         else
1141                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1142
1143         brelse(el.el_bh);
1144
1145         return error;
1146 }
1147
1148 /**
1149  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1150  * @ip: The inode
1151  * @name: The name of the extended attribute
1152  * @value: The value of the extended attribute (NULL for remove)
1153  * @size: The size of the @value argument
1154  * @flags: Create or Replace
1155  * @type: The type of the extended attribute
1156  *
1157  * See gfs2_xattr_remove() for details of the removal of xattrs.
1158  *
1159  * Returns: 0 or errno on failure
1160  */
1161
1162 int __gfs2_xattr_set(struct inode *inode, const char *name,
1163                    const void *value, size_t size, int flags, int type)
1164 {
1165         struct gfs2_inode *ip = GFS2_I(inode);
1166         struct gfs2_sbd *sdp = GFS2_SB(inode);
1167         struct gfs2_ea_location el;
1168         unsigned int namel = strlen(name);
1169         int error;
1170
1171         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1172                 return -EPERM;
1173         if (namel > GFS2_EA_MAX_NAME_LEN)
1174                 return -ERANGE;
1175
1176         if (value == NULL)
1177                 return gfs2_xattr_remove(ip, type, name);
1178
1179         if (ea_check_size(sdp, namel, size))
1180                 return -ERANGE;
1181
1182         if (!ip->i_eattr) {
1183                 if (flags & XATTR_REPLACE)
1184                         return -ENODATA;
1185                 return ea_init(ip, type, name, value, size);
1186         }
1187
1188         error = gfs2_ea_find(ip, type, name, &el);
1189         if (error)
1190                 return error;
1191
1192         if (el.el_ea) {
1193                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1194                         brelse(el.el_bh);
1195                         return -EPERM;
1196                 }
1197
1198                 error = -EEXIST;
1199                 if (!(flags & XATTR_CREATE)) {
1200                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1201                         error = ea_set_i(ip, type, name, value, size, &el);
1202                         if (!error && unstuffed)
1203                                 ea_set_remove_unstuffed(ip, &el);
1204                 }
1205
1206                 brelse(el.el_bh);
1207                 return error;
1208         }
1209
1210         error = -ENODATA;
1211         if (!(flags & XATTR_REPLACE))
1212                 error = ea_set_i(ip, type, name, value, size, NULL);
1213
1214         return error;
1215 }
1216
1217 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1218                 const void *value, size_t size, int flags, int type)
1219 {
1220         return __gfs2_xattr_set(dentry->d_inode, name, value,
1221                                 size, flags, type);
1222 }
1223
1224 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1225                                   struct gfs2_ea_header *ea, char *data)
1226 {
1227         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1228         struct buffer_head **bh;
1229         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1230         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1231         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1232         unsigned int x;
1233         int error;
1234
1235         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1236         if (!bh)
1237                 return -ENOMEM;
1238
1239         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1240         if (error)
1241                 goto out;
1242
1243         for (x = 0; x < nptrs; x++) {
1244                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1245                                        bh + x);
1246                 if (error) {
1247                         while (x--)
1248                                 brelse(bh[x]);
1249                         goto fail;
1250                 }
1251                 dataptrs++;
1252         }
1253
1254         for (x = 0; x < nptrs; x++) {
1255                 error = gfs2_meta_wait(sdp, bh[x]);
1256                 if (error) {
1257                         for (; x < nptrs; x++)
1258                                 brelse(bh[x]);
1259                         goto fail;
1260                 }
1261                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1262                         for (; x < nptrs; x++)
1263                                 brelse(bh[x]);
1264                         error = -EIO;
1265                         goto fail;
1266                 }
1267
1268                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1269
1270                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1271                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1272
1273                 amount -= sdp->sd_jbsize;
1274                 data += sdp->sd_jbsize;
1275
1276                 brelse(bh[x]);
1277         }
1278
1279 out:
1280         kfree(bh);
1281         return error;
1282
1283 fail:
1284         gfs2_trans_end(sdp);
1285         kfree(bh);
1286         return error;
1287 }
1288
1289 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1290 {
1291         struct inode *inode = &ip->i_inode;
1292         struct gfs2_sbd *sdp = GFS2_SB(inode);
1293         struct gfs2_ea_location el;
1294         int error;
1295
1296         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1297         if (error)
1298                 return error;
1299
1300         if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1301                 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1302                 if (error == 0) {
1303                         gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1304                         memcpy(GFS2_EA2DATA(el.el_ea), data,
1305                                GFS2_EA_DATA_LEN(el.el_ea));
1306                 }
1307         } else {
1308                 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1309         }
1310
1311         brelse(el.el_bh);
1312         if (error)
1313                 return error;
1314
1315         error = gfs2_setattr_simple(inode, attr);
1316         gfs2_trans_end(sdp);
1317         return error;
1318 }
1319
1320 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1321 {
1322         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1323         struct gfs2_rgrp_list rlist;
1324         struct buffer_head *indbh, *dibh;
1325         __be64 *eablk, *end;
1326         unsigned int rg_blocks = 0;
1327         u64 bstart = 0;
1328         unsigned int blen = 0;
1329         unsigned int blks = 0;
1330         unsigned int x;
1331         int error;
1332
1333         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1334
1335         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1336         if (error)
1337                 return error;
1338
1339         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1340                 error = -EIO;
1341                 goto out;
1342         }
1343
1344         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1345         end = eablk + sdp->sd_inptrs;
1346
1347         for (; eablk < end; eablk++) {
1348                 u64 bn;
1349
1350                 if (!*eablk)
1351                         break;
1352                 bn = be64_to_cpu(*eablk);
1353
1354                 if (bstart + blen == bn)
1355                         blen++;
1356                 else {
1357                         if (bstart)
1358                                 gfs2_rlist_add(ip, &rlist, bstart);
1359                         bstart = bn;
1360                         blen = 1;
1361                 }
1362                 blks++;
1363         }
1364         if (bstart)
1365                 gfs2_rlist_add(ip, &rlist, bstart);
1366         else
1367                 goto out;
1368
1369         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1370
1371         for (x = 0; x < rlist.rl_rgrps; x++) {
1372                 struct gfs2_rgrpd *rgd;
1373                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1374                 rg_blocks += rgd->rd_length;
1375         }
1376
1377         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1378         if (error)
1379                 goto out_rlist_free;
1380
1381         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1382                                  RES_STATFS + RES_QUOTA, blks);
1383         if (error)
1384                 goto out_gunlock;
1385
1386         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1387
1388         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1389         bstart = 0;
1390         blen = 0;
1391
1392         for (; eablk < end; eablk++) {
1393                 u64 bn;
1394
1395                 if (!*eablk)
1396                         break;
1397                 bn = be64_to_cpu(*eablk);
1398
1399                 if (bstart + blen == bn)
1400                         blen++;
1401                 else {
1402                         if (bstart)
1403                                 gfs2_free_meta(ip, bstart, blen);
1404                         bstart = bn;
1405                         blen = 1;
1406                 }
1407
1408                 *eablk = 0;
1409                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1410         }
1411         if (bstart)
1412                 gfs2_free_meta(ip, bstart, blen);
1413
1414         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1415
1416         error = gfs2_meta_inode_buffer(ip, &dibh);
1417         if (!error) {
1418                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1419                 gfs2_dinode_out(ip, dibh->b_data);
1420                 brelse(dibh);
1421         }
1422
1423         gfs2_trans_end(sdp);
1424
1425 out_gunlock:
1426         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1427 out_rlist_free:
1428         gfs2_rlist_free(&rlist);
1429 out:
1430         brelse(indbh);
1431         return error;
1432 }
1433
1434 static int ea_dealloc_block(struct gfs2_inode *ip)
1435 {
1436         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1437         struct gfs2_rgrpd *rgd;
1438         struct buffer_head *dibh;
1439         struct gfs2_holder gh;
1440         int error;
1441
1442         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1443         if (!rgd) {
1444                 gfs2_consist_inode(ip);
1445                 return -EIO;
1446         }
1447
1448         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1449         if (error)
1450                 return error;
1451
1452         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1453                                  RES_QUOTA, 1);
1454         if (error)
1455                 goto out_gunlock;
1456
1457         gfs2_free_meta(ip, ip->i_eattr, 1);
1458
1459         ip->i_eattr = 0;
1460         gfs2_add_inode_blocks(&ip->i_inode, -1);
1461
1462         error = gfs2_meta_inode_buffer(ip, &dibh);
1463         if (!error) {
1464                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1465                 gfs2_dinode_out(ip, dibh->b_data);
1466                 brelse(dibh);
1467         }
1468
1469         gfs2_trans_end(sdp);
1470
1471 out_gunlock:
1472         gfs2_glock_dq_uninit(&gh);
1473         return error;
1474 }
1475
1476 /**
1477  * gfs2_ea_dealloc - deallocate the extended attribute fork
1478  * @ip: the inode
1479  *
1480  * Returns: errno
1481  */
1482
1483 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1484 {
1485         struct gfs2_qadata *qa;
1486         int error;
1487
1488         qa = gfs2_qadata_get(ip);
1489         if (!qa)
1490                 return -ENOMEM;
1491
1492         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1493         if (error)
1494                 goto out_alloc;
1495
1496         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1497         if (error)
1498                 goto out_quota;
1499
1500         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1501                 error = ea_dealloc_indirect(ip);
1502                 if (error)
1503                         goto out_quota;
1504         }
1505
1506         error = ea_dealloc_block(ip);
1507
1508 out_quota:
1509         gfs2_quota_unhold(ip);
1510 out_alloc:
1511         gfs2_qadata_put(ip);
1512         return error;
1513 }
1514
1515 static const struct xattr_handler gfs2_xattr_user_handler = {
1516         .prefix = XATTR_USER_PREFIX,
1517         .flags  = GFS2_EATYPE_USR,
1518         .get    = gfs2_xattr_get,
1519         .set    = gfs2_xattr_set,
1520 };
1521
1522 static const struct xattr_handler gfs2_xattr_security_handler = {
1523         .prefix = XATTR_SECURITY_PREFIX,
1524         .flags  = GFS2_EATYPE_SECURITY,
1525         .get    = gfs2_xattr_get,
1526         .set    = gfs2_xattr_set,
1527 };
1528
1529 const struct xattr_handler *gfs2_xattr_handlers[] = {
1530         &gfs2_xattr_user_handler,
1531         &gfs2_xattr_security_handler,
1532         &gfs2_xattr_system_handler,
1533         NULL,
1534 };
1535