fs/gfs2/xattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/posix_acl_xattr.h>
  17 #include <linux/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "acl.h"
  22 #include "xattr.h"
  23 #include "glock.h"
  24 #include "inode.h"
  25 #include "meta_io.h"
  26 #include "quota.h"
  27 #include "rgrp.h"
  28 #include "super.h"
  29 #include "trans.h"
  30 #include "util.h"
  31
  32 /**
  33  * ea_calc_size - returns the acutal number of bytes the request will take up
  34  *                (not counting any unstuffed data blocks)
  35  * @sdp:
  36  * @er:
  37  * @size:
  38  *
  39  * Returns: 1 if the EA should be stuffed
  40  */
  41
  42 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  43                         unsigned int *size)
  44 {
  45         unsigned int jbsize = sdp->sd_jbsize;
  46
  47         /* Stuffed */
  48         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  49
  50         if (*size <= jbsize)
  51                 return 1;
  52
  53         /* Unstuffed */
  54         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  55                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  56
  57         return 0;
  58 }
  59
  60 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  61 {
  62         unsigned int size;
  63
  64         if (dsize > GFS2_EA_MAX_DATA_LEN)
  65                 return -ERANGE;
  66
  67         ea_calc_size(sdp, nsize, dsize, &size);
  68
  69         /* This can only happen with 512 byte blocks */
  70         if (size > sdp->sd_jbsize)
  71                 return -ERANGE;
  72
  73         return 0;
  74 }
  75
  76 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  77                           struct gfs2_ea_header *ea,
  78                           struct gfs2_ea_header *prev, void *private);
  79
  80 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  81                         ea_call_t ea_call, void *data)
  82 {
  83         struct gfs2_ea_header *ea, *prev = NULL;
  84         int error = 0;
  85
  86         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  87                 return -EIO;
  88
  89         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  90                 if (!GFS2_EA_REC_LEN(ea))
  91                         goto fail;
  92                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  93                                                   bh->b_data + bh->b_size))
  94                         goto fail;
  95                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  96                         goto fail;
  97
  98                 error = ea_call(ip, bh, ea, prev, data);
  99                 if (error)
 100                         return error;
 101
 102                 if (GFS2_EA_IS_LAST(ea)) {
 103                         if ((char *)GFS2_EA2NEXT(ea) !=
 104                             bh->b_data + bh->b_size)
 105                                 goto fail;
 106                         break;
 107                 }
 108         }
 109
 110         return error;
 111
 112 fail:
 113         gfs2_consist_inode(ip);
 114         return -EIO;
 115 }
 116
 117 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 118 {
 119         struct buffer_head *bh, *eabh;
 120         __be64 *eablk, *end;
 121         int error;
 122
 123         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
 124         if (error)
 125                 return error;
 126
 127         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 128                 error = ea_foreach_i(ip, bh, ea_call, data);
 129                 goto out;
 130         }
 131
 132         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 133                 error = -EIO;
 134                 goto out;
 135         }
 136
 137         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 138         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 139
 140         for (; eablk < end; eablk++) {
 141                 u64 bn;
 142
 143                 if (!*eablk)
 144                         break;
 145                 bn = be64_to_cpu(*eablk);
 146
 147                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
 148                 if (error)
 149                         break;
 150                 error = ea_foreach_i(ip, eabh, ea_call, data);
 151                 brelse(eabh);
 152                 if (error)
 153                         break;
 154         }
 155 out:
 156         brelse(bh);
 157         return error;
 158 }
 159
 160 struct ea_find {
 161         int type;
 162         const char *name;
 163         size_t namel;
 164         struct gfs2_ea_location *ef_el;
 165 };
 166
 167 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 168                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 169                      void *private)
 170 {
 171         struct ea_find *ef = private;
 172
 173         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 174                 return 0;
 175
 176         if (ea->ea_type == ef->type) {
 177                 if (ea->ea_name_len == ef->namel &&
 178                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 179                         struct gfs2_ea_location *el = ef->ef_el;
 180                         get_bh(bh);
 181                         el->el_bh = bh;
 182                         el->el_ea = ea;
 183                         el->el_prev = prev;
 184                         return 1;
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 192                         struct gfs2_ea_location *el)
 193 {
 194         struct ea_find ef;
 195         int error;
 196
 197         ef.type = type;
 198         ef.name = name;
 199         ef.namel = strlen(name);
 200         ef.ef_el = el;
 201
 202         memset(el, 0, sizeof(struct gfs2_ea_location));
 203
 204         error = ea_foreach(ip, ea_find_i, &ef);
 205         if (error > 0)
 206                 return 0;
 207
 208         return error;
 209 }
 210
 211 /**
 212  * ea_dealloc_unstuffed -
 213  * @ip:
 214  * @bh:
 215  * @ea:
 216  * @prev:
 217  * @private:
 218  *
 219  * Take advantage of the fact that all unstuffed blocks are
 220  * allocated from the same RG.  But watch, this may not always
 221  * be true.
 222  *
 223  * Returns: errno
 224  */
 225
 226 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 227                                 struct gfs2_ea_header *ea,
 228                                 struct gfs2_ea_header *prev, void *private)
 229 {
 230         int *leave = private;
 231         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 232         struct gfs2_rgrpd *rgd;
 233         struct gfs2_holder rg_gh;
 234         __be64 *dataptrs;
 235         u64 bn = 0;
 236         u64 bstart = 0;
 237         unsigned int blen = 0;
 238         unsigned int blks = 0;
 239         unsigned int x;
 240         int error;
 241
 242         error = gfs2_rindex_update(sdp);
 243         if (error)
 244                 return error;
 245
 246         if (GFS2_EA_IS_STUFFED(ea))
 247                 return 0;
 248
 249         dataptrs = GFS2_EA2DATAPTRS(ea);
 250         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 251                 if (*dataptrs) {
 252                         blks++;
 253                         bn = be64_to_cpu(*dataptrs);
 254                 }
 255         }
 256         if (!blks)
 257                 return 0;
 258
 259         rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 260         if (!rgd) {
 261                 gfs2_consist_inode(ip);
 262                 return -EIO;
 263         }
 264
 265         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 266         if (error)
 267                 return error;
 268
 269         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 270                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 271         if (error)
 272                 goto out_gunlock;
 273
 274         gfs2_trans_add_meta(ip->i_gl, bh);
 275
 276         dataptrs = GFS2_EA2DATAPTRS(ea);
 277         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 278                 if (!*dataptrs)
 279                         break;
 280                 bn = be64_to_cpu(*dataptrs);
 281
 282                 if (bstart + blen == bn)
 283                         blen++;
 284                 else {
 285                         if (bstart)
 286                                 gfs2_free_meta(ip, bstart, blen);
 287                         bstart = bn;
 288                         blen = 1;
 289                 }
 290
 291                 *dataptrs = 0;
 292                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 293         }
 294         if (bstart)
 295                 gfs2_free_meta(ip, bstart, blen);
 296
 297         if (prev && !leave) {
 298                 u32 len;
 299
 300                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 301                 prev->ea_rec_len = cpu_to_be32(len);
 302
 303                 if (GFS2_EA_IS_LAST(ea))
 304                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 305         } else {
 306                 ea->ea_type = GFS2_EATYPE_UNUSED;
 307                 ea->ea_num_ptrs = 0;
 308         }
 309
 310         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 311         __mark_inode_dirty(&ip->i_inode, I_DIRTY_SYNC | I_DIRTY_DATASYNC);
 312
 313         gfs2_trans_end(sdp);
 314
 315 out_gunlock:
 316         gfs2_glock_dq_uninit(&rg_gh);
 317         return error;
 318 }
 319
 320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 321                                struct gfs2_ea_header *ea,
 322                                struct gfs2_ea_header *prev, int leave)
 323 {
 324         int error;
 325
 326         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 327         if (error)
 328                 return error;
 329
 330         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 331         if (error)
 332                 goto out_alloc;
 333
 334         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 335
 336         gfs2_quota_unhold(ip);
 337 out_alloc:
 338         return error;
 339 }
 340
 341 struct ea_list {
 342         struct gfs2_ea_request *ei_er;
 343         unsigned int ei_size;
 344 };
 345
 346 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 347 {
 348         switch (ea->ea_type) {
 349         case GFS2_EATYPE_USR:
 350                 return 5 + ea->ea_name_len + 1;
 351         case GFS2_EATYPE_SYS:
 352                 return 7 + ea->ea_name_len + 1;
 353         case GFS2_EATYPE_SECURITY:
 354                 return 9 + ea->ea_name_len + 1;
 355         default:
 356                 return 0;
 357         }
 358 }
 359
 360 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 361                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 362                      void *private)
 363 {
 364         struct ea_list *ei = private;
 365         struct gfs2_ea_request *er = ei->ei_er;
 366         unsigned int ea_size = gfs2_ea_strlen(ea);
 367
 368         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 369                 return 0;
 370
 371         if (er->er_data_len) {
 372                 char *prefix = NULL;
 373                 unsigned int l = 0;
 374                 char c = 0;
 375
 376                 if (ei->ei_size + ea_size > er->er_data_len)
 377                         return -ERANGE;
 378
 379                 switch (ea->ea_type) {
 380                 case GFS2_EATYPE_USR:
 381                         prefix = "user.";
 382                         l = 5;
 383                         break;
 384                 case GFS2_EATYPE_SYS:
 385                         prefix = "system.";
 386                         l = 7;
 387                         break;
 388                 case GFS2_EATYPE_SECURITY:
 389                         prefix = "security.";
 390                         l = 9;
 391                         break;
 392                 }
 393
 394                 BUG_ON(l == 0);
 395
 396                 memcpy(er->er_data + ei->ei_size, prefix, l);
 397                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 398                        ea->ea_name_len);
 399                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 400         }
 401
 402         ei->ei_size += ea_size;
 403
 404         return 0;
 405 }
 406
 407 /**
 408  * gfs2_listxattr - List gfs2 extended attributes
 409  * @dentry: The dentry whose inode we are interested in
 410  * @buffer: The buffer to write the results
 411  * @size: The size of the buffer
 412  *
 413  * Returns: actual size of data on success, -errno on error
 414  */
 415
 416 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 417 {
 418         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 419         struct gfs2_ea_request er;
 420         struct gfs2_holder i_gh;
 421         int error;
 422
 423         memset(&er, 0, sizeof(struct gfs2_ea_request));
 424         if (size) {
 425                 er.er_data = buffer;
 426                 er.er_data_len = size;
 427         }
 428
 429         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 430         if (error)
 431                 return error;
 432
 433         if (ip->i_eattr) {
 434                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 435
 436                 error = ea_foreach(ip, ea_list_i, &ei);
 437                 if (!error)
 438                         error = ei.ei_size;
 439         }
 440
 441         gfs2_glock_dq_uninit(&i_gh);
 442
 443         return error;
 444 }
 445
 446 /**
 447  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 448  *                     request buffer
 449  * @ip: The GFS2 inode
 450  * @ea: The extended attribute header structure
 451  * @din: The data to be copied in
 452  * @dout: The data to be copied out (one of din,dout will be NULL)
 453  *
 454  * Returns: errno
 455  */
 456
 457 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 458                                const char *din, char *dout)
 459 {
 460         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 461         struct buffer_head **bh;
 462         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 463         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 464         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 465         unsigned int x;
 466         int error = 0;
 467         unsigned char *pos;
 468         unsigned cp_size;
 469
 470         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 471         if (!bh)
 472                 return -ENOMEM;
 473
 474         for (x = 0; x < nptrs; x++) {
 475                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
 476                                        bh + x);
 477                 if (error) {
 478                         while (x--)
 479                                 brelse(bh[x]);
 480                         goto out;
 481                 }
 482                 dataptrs++;
 483         }
 484
 485         for (x = 0; x < nptrs; x++) {
 486                 error = gfs2_meta_wait(sdp, bh[x]);
 487                 if (error) {
 488                         for (; x < nptrs; x++)
 489                                 brelse(bh[x]);
 490                         goto out;
 491                 }
 492                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 493                         for (; x < nptrs; x++)
 494                                 brelse(bh[x]);
 495                         error = -EIO;
 496                         goto out;
 497                 }
 498
 499                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 500                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 501
 502                 if (dout) {
 503                         memcpy(dout, pos, cp_size);
 504                         dout += sdp->sd_jbsize;
 505                 }
 506
 507                 if (din) {
 508                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 509                         memcpy(pos, din, cp_size);
 510                         din += sdp->sd_jbsize;
 511                 }
 512
 513                 amount -= sdp->sd_jbsize;
 514                 brelse(bh[x]);
 515         }
 516
 517 out:
 518         kfree(bh);
 519         return error;
 520 }
 521
 522 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 523                             char *data, size_t size)
 524 {
 525         int ret;
 526         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 527         if (len > size)
 528                 return -ERANGE;
 529
 530         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 531                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 532                 return len;
 533         }
 534         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 535         if (ret < 0)
 536                 return ret;
 537         return len;
 538 }
 539
 540 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 541 {
 542         struct gfs2_ea_location el;
 543         int error;
 544         int len;
 545         char *data;
 546
 547         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 548         if (error)
 549                 return error;
 550         if (!el.el_ea)
 551                 goto out;
 552         if (!GFS2_EA_DATA_LEN(el.el_ea))
 553                 goto out;
 554
 555         len = GFS2_EA_DATA_LEN(el.el_ea);
 556         data = kmalloc(len, GFP_NOFS);
 557         error = -ENOMEM;
 558         if (data == NULL)
 559                 goto out;
 560
 561         error = gfs2_ea_get_copy(ip, &el, data, len);
 562         if (error < 0)
 563                 kfree(data);
 564         else
 565                 *ppdata = data;
 566 out:
 567         brelse(el.el_bh);
 568         return error;
 569 }
 570
 571 /**
 572  * gfs2_xattr_get - Get a GFS2 extended attribute
 573  * @inode: The inode
 574  * @name: The name of the extended attribute
 575  * @buffer: The buffer to write the result into
 576  * @size: The size of the buffer
 577  * @type: The type of extended attribute
 578  *
 579  * Returns: actual size of data on success, -errno on error
 580  */
 581 static int __gfs2_xattr_get(struct inode *inode, const char *name,
 582                             void *buffer, size_t size, int type)
 583 {
 584         struct gfs2_inode *ip = GFS2_I(inode);
 585         struct gfs2_ea_location el;
 586         int error;
 587
 588         if (!ip->i_eattr)
 589                 return -ENODATA;
 590         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 591                 return -EINVAL;
 592
 593         error = gfs2_ea_find(ip, type, name, &el);
 594         if (error)
 595                 return error;
 596         if (!el.el_ea)
 597                 return -ENODATA;
 598         if (size)
 599                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 600         else
 601                 error = GFS2_EA_DATA_LEN(el.el_ea);
 602         brelse(el.el_bh);
 603
 604         return error;
 605 }
 606
 607 static int gfs2_xattr_get(const struct xattr_handler *handler,
 608                           struct dentry *unused, struct inode *inode,
 609                           const char *name, void *buffer, size_t size)
 610 {
 611         struct gfs2_inode *ip = GFS2_I(inode);
 612         struct gfs2_holder gh;
 613         int ret;
 614
 615         /* During lookup, SELinux calls this function with the glock locked. */
 616
 617         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 618                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 619                 if (ret)
 620                         return ret;
 621         } else {
 622                 gfs2_holder_mark_uninitialized(&gh);
 623         }
 624         ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
 625         if (gfs2_holder_initialized(&gh))
 626                 gfs2_glock_dq_uninit(&gh);
 627         return ret;
 628 }
 629
 630 /**
 631  * ea_alloc_blk - allocates a new block for extended attributes.
 632  * @ip: A pointer to the inode that's getting extended attributes
 633  * @bhp: Pointer to pointer to a struct buffer_head
 634  *
 635  * Returns: errno
 636  */
 637
 638 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 639 {
 640         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 641         struct gfs2_ea_header *ea;
 642         unsigned int n = 1;
 643         u64 block;
 644         int error;
 645
 646         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 647         if (error)
 648                 return error;
 649         gfs2_trans_add_unrevoke(sdp, block, 1);
 650         *bhp = gfs2_meta_new(ip->i_gl, block);
 651         gfs2_trans_add_meta(ip->i_gl, *bhp);
 652         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 653         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 654
 655         ea = GFS2_EA_BH2FIRST(*bhp);
 656         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 657         ea->ea_type = GFS2_EATYPE_UNUSED;
 658         ea->ea_flags = GFS2_EAFLAG_LAST;
 659         ea->ea_num_ptrs = 0;
 660
 661         gfs2_add_inode_blocks(&ip->i_inode, 1);
 662
 663         return 0;
 664 }
 665
 666 /**
 667  * ea_write - writes the request info to an ea, creating new blocks if
 668  *            necessary
 669  * @ip: inode that is being modified
 670  * @ea: the location of the new ea in a block
 671  * @er: the write request
 672  *
 673  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 674  *
 675  * returns : errno
 676  */
 677
 678 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 679                     struct gfs2_ea_request *er)
 680 {
 681         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 682         int error;
 683
 684         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 685         ea->ea_name_len = er->er_name_len;
 686         ea->ea_type = er->er_type;
 687         ea->__pad = 0;
 688
 689         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 690
 691         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 692                 ea->ea_num_ptrs = 0;
 693                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 694         } else {
 695                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 696                 const char *data = er->er_data;
 697                 unsigned int data_len = er->er_data_len;
 698                 unsigned int copy;
 699                 unsigned int x;
 700
 701                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 702                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 703                         struct buffer_head *bh;
 704                         u64 block;
 705                         int mh_size = sizeof(struct gfs2_meta_header);
 706                         unsigned int n = 1;
 707
 708                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 709                         if (error)
 710                                 return error;
 711                         gfs2_trans_add_unrevoke(sdp, block, 1);
 712                         bh = gfs2_meta_new(ip->i_gl, block);
 713                         gfs2_trans_add_meta(ip->i_gl, bh);
 714                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 715
 716                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 717
 718                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 719                                                            data_len;
 720                         memcpy(bh->b_data + mh_size, data, copy);
 721                         if (copy < sdp->sd_jbsize)
 722                                 memset(bh->b_data + mh_size + copy, 0,
 723                                        sdp->sd_jbsize - copy);
 724
 725                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 726                         data += copy;
 727                         data_len -= copy;
 728
 729                         brelse(bh);
 730                 }
 731
 732                 gfs2_assert_withdraw(sdp, !data_len);
 733         }
 734
 735         return 0;
 736 }
 737
 738 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 739                                    struct gfs2_ea_request *er, void *private);
 740
 741 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 742                              unsigned int blks,
 743                              ea_skeleton_call_t skeleton_call, void *private)
 744 {
 745         struct gfs2_alloc_parms ap = { .target = blks };
 746         int error;
 747
 748         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 749         if (error)
 750                 return error;
 751
 752         error = gfs2_quota_lock_check(ip, &ap);
 753         if (error)
 754                 return error;
 755
 756         error = gfs2_inplace_reserve(ip, &ap);
 757         if (error)
 758                 goto out_gunlock_q;
 759
 760         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 761                                  blks + gfs2_rg_blocks(ip, blks) +
 762                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 763         if (error)
 764                 goto out_ipres;
 765
 766         error = skeleton_call(ip, er, private);
 767         if (error)
 768                 goto out_end_trans;
 769
 770         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 771         __mark_inode_dirty(&ip->i_inode, I_DIRTY_SYNC | I_DIRTY_DATASYNC);
 772
 773 out_end_trans:
 774         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 775 out_ipres:
 776         gfs2_inplace_release(ip);
 777 out_gunlock_q:
 778         gfs2_quota_unlock(ip);
 779         return error;
 780 }
 781
 782 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 783                      void *private)
 784 {
 785         struct buffer_head *bh;
 786         int error;
 787
 788         error = ea_alloc_blk(ip, &bh);
 789         if (error)
 790                 return error;
 791
 792         ip->i_eattr = bh->b_blocknr;
 793         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 794
 795         brelse(bh);
 796
 797         return error;
 798 }
 799
 800 /**
 801  * ea_init - initializes a new eattr block
 802  * @ip:
 803  * @er:
 804  *
 805  * Returns: errno
 806  */
 807
 808 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 809                    const void *data, size_t size)
 810 {
 811         struct gfs2_ea_request er;
 812         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 813         unsigned int blks = 1;
 814
 815         er.er_type = type;
 816         er.er_name = name;
 817         er.er_name_len = strlen(name);
 818         er.er_data = (void *)data;
 819         er.er_data_len = size;
 820
 821         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 822                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 823
 824         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 825 }
 826
 827 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 828 {
 829         u32 ea_size = GFS2_EA_SIZE(ea);
 830         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 831                                      ea_size);
 832         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 833         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 834
 835         ea->ea_rec_len = cpu_to_be32(ea_size);
 836         ea->ea_flags ^= last;
 837
 838         new->ea_rec_len = cpu_to_be32(new_size);
 839         new->ea_flags = last;
 840
 841         return new;
 842 }
 843
 844 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 845                                   struct gfs2_ea_location *el)
 846 {
 847         struct gfs2_ea_header *ea = el->el_ea;
 848         struct gfs2_ea_header *prev = el->el_prev;
 849         u32 len;
 850
 851         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 852
 853         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 854                 ea->ea_type = GFS2_EATYPE_UNUSED;
 855                 return;
 856         } else if (GFS2_EA2NEXT(prev) != ea) {
 857                 prev = GFS2_EA2NEXT(prev);
 858                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 859         }
 860
 861         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 862         prev->ea_rec_len = cpu_to_be32(len);
 863
 864         if (GFS2_EA_IS_LAST(ea))
 865                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 866 }
 867
 868 struct ea_set {
 869         int ea_split;
 870
 871         struct gfs2_ea_request *es_er;
 872         struct gfs2_ea_location *es_el;
 873
 874         struct buffer_head *es_bh;
 875         struct gfs2_ea_header *es_ea;
 876 };
 877
 878 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 879                                  struct gfs2_ea_header *ea, struct ea_set *es)
 880 {
 881         struct gfs2_ea_request *er = es->es_er;
 882         int error;
 883
 884         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 885         if (error)
 886                 return error;
 887
 888         gfs2_trans_add_meta(ip->i_gl, bh);
 889
 890         if (es->ea_split)
 891                 ea = ea_split_ea(ea);
 892
 893         ea_write(ip, ea, er);
 894
 895         if (es->es_el)
 896                 ea_set_remove_stuffed(ip, es->es_el);
 897
 898         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 899         __mark_inode_dirty(&ip->i_inode, I_DIRTY_SYNC | I_DIRTY_DATASYNC);
 900
 901         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 902         return error;
 903 }
 904
 905 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 906                                struct gfs2_ea_request *er, void *private)
 907 {
 908         struct ea_set *es = private;
 909         struct gfs2_ea_header *ea = es->es_ea;
 910         int error;
 911
 912         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 913
 914         if (es->ea_split)
 915                 ea = ea_split_ea(ea);
 916
 917         error = ea_write(ip, ea, er);
 918         if (error)
 919                 return error;
 920
 921         if (es->es_el)
 922                 ea_set_remove_stuffed(ip, es->es_el);
 923
 924         return 0;
 925 }
 926
 927 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 928                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 929                          void *private)
 930 {
 931         struct ea_set *es = private;
 932         unsigned int size;
 933         int stuffed;
 934         int error;
 935
 936         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 937                                es->es_er->er_data_len, &size);
 938
 939         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 940                 if (GFS2_EA_REC_LEN(ea) < size)
 941                         return 0;
 942                 if (!GFS2_EA_IS_STUFFED(ea)) {
 943                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 944                         if (error)
 945                                 return error;
 946                 }
 947                 es->ea_split = 0;
 948         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 949                 es->ea_split = 1;
 950         else
 951                 return 0;
 952
 953         if (stuffed) {
 954                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 955                 if (error)
 956                         return error;
 957         } else {
 958                 unsigned int blks;
 959
 960                 es->es_bh = bh;
 961                 es->es_ea = ea;
 962                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 963                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 964
 965                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 966                                           ea_set_simple_alloc, es);
 967                 if (error)
 968                         return error;
 969         }
 970
 971         return 1;
 972 }
 973
 974 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 975                         void *private)
 976 {
 977         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 978         struct buffer_head *indbh, *newbh;
 979         __be64 *eablk;
 980         int error;
 981         int mh_size = sizeof(struct gfs2_meta_header);
 982
 983         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 984                 __be64 *end;
 985
 986                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
 987                                        &indbh);
 988                 if (error)
 989                         return error;
 990
 991                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 992                         error = -EIO;
 993                         goto out;
 994                 }
 995
 996                 eablk = (__be64 *)(indbh->b_data + mh_size);
 997                 end = eablk + sdp->sd_inptrs;
 998
 999                 for (; eablk < end; eablk++)
1000                         if (!*eablk)
1001                                 break;
1002
1003                 if (eablk == end) {
1004                         error = -ENOSPC;
1005                         goto out;
1006                 }
1007
1008                 gfs2_trans_add_meta(ip->i_gl, indbh);
1009         } else {
1010                 u64 blk;
1011                 unsigned int n = 1;
1012                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1013                 if (error)
1014                         return error;
1015                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1016                 indbh = gfs2_meta_new(ip->i_gl, blk);
1017                 gfs2_trans_add_meta(ip->i_gl, indbh);
1018                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1019                 gfs2_buffer_clear_tail(indbh, mh_size);
1020
1021                 eablk = (__be64 *)(indbh->b_data + mh_size);
1022                 *eablk = cpu_to_be64(ip->i_eattr);
1023                 ip->i_eattr = blk;
1024                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1025                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1026
1027                 eablk++;
1028         }
1029
1030         error = ea_alloc_blk(ip, &newbh);
1031         if (error)
1032                 goto out;
1033
1034         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1035         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1036         brelse(newbh);
1037         if (error)
1038                 goto out;
1039
1040         if (private)
1041                 ea_set_remove_stuffed(ip, private);
1042
1043 out:
1044         brelse(indbh);
1045         return error;
1046 }
1047
1048 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1049                     const void *value, size_t size, struct gfs2_ea_location *el)
1050 {
1051         struct gfs2_ea_request er;
1052         struct ea_set es;
1053         unsigned int blks = 2;
1054         int error;
1055
1056         er.er_type = type;
1057         er.er_name = name;
1058         er.er_data = (void *)value;
1059         er.er_name_len = strlen(name);
1060         er.er_data_len = size;
1061
1062         memset(&es, 0, sizeof(struct ea_set));
1063         es.es_er = &er;
1064         es.es_el = el;
1065
1066         error = ea_foreach(ip, ea_set_simple, &es);
1067         if (error > 0)
1068                 return 0;
1069         if (error)
1070                 return error;
1071
1072         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1073                 blks++;
1074         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1075                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1076
1077         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1078 }
1079
1080 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1081                                    struct gfs2_ea_location *el)
1082 {
1083         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1084                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1085                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1086                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1087         }
1088
1089         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1090 }
1091
1092 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1093 {
1094         struct gfs2_ea_header *ea = el->el_ea;
1095         struct gfs2_ea_header *prev = el->el_prev;
1096         int error;
1097
1098         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1099         if (error)
1100                 return error;
1101
1102         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1103
1104         if (prev) {
1105                 u32 len;
1106
1107                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1108                 prev->ea_rec_len = cpu_to_be32(len);
1109
1110                 if (GFS2_EA_IS_LAST(ea))
1111                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1112         } else {
1113                 ea->ea_type = GFS2_EATYPE_UNUSED;
1114         }
1115
1116         ip->i_inode.i_ctime = current_time(&ip->i_inode);
1117         __mark_inode_dirty(&ip->i_inode, I_DIRTY_SYNC | I_DIRTY_DATASYNC);
1118
1119         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1120
1121         return error;
1122 }
1123
1124 /**
1125  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1126  * @ip: The inode
1127  * @type: The type of the extended attribute
1128  * @name: The name of the extended attribute
1129  *
1130  * This is not called directly by the VFS since we use the (common)
1131  * scheme of making a "set with NULL data" mean a remove request. Note
1132  * that this is different from a set with zero length data.
1133  *
1134  * Returns: 0, or errno on failure
1135  */
1136
1137 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1138 {
1139         struct gfs2_ea_location el;
1140         int error;
1141
1142         if (!ip->i_eattr)
1143                 return -ENODATA;
1144
1145         error = gfs2_ea_find(ip, type, name, &el);
1146         if (error)
1147                 return error;
1148         if (!el.el_ea)
1149                 return -ENODATA;
1150
1151         if (GFS2_EA_IS_STUFFED(el.el_ea))
1152                 error = ea_remove_stuffed(ip, &el);
1153         else
1154                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1155
1156         brelse(el.el_bh);
1157
1158         return error;
1159 }
1160
1161 /**
1162  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1163  * @ip: The inode
1164  * @name: The name of the extended attribute
1165  * @value: The value of the extended attribute (NULL for remove)
1166  * @size: The size of the @value argument
1167  * @flags: Create or Replace
1168  * @type: The type of the extended attribute
1169  *
1170  * See gfs2_xattr_remove() for details of the removal of xattrs.
1171  *
1172  * Returns: 0 or errno on failure
1173  */
1174
1175 int __gfs2_xattr_set(struct inode *inode, const char *name,
1176                    const void *value, size_t size, int flags, int type)
1177 {
1178         struct gfs2_inode *ip = GFS2_I(inode);
1179         struct gfs2_sbd *sdp = GFS2_SB(inode);
1180         struct gfs2_ea_location el;
1181         unsigned int namel = strlen(name);
1182         int error;
1183
1184         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1185                 return -EPERM;
1186         if (namel > GFS2_EA_MAX_NAME_LEN)
1187                 return -ERANGE;
1188
1189         if (value == NULL) {
1190                 error = gfs2_xattr_remove(ip, type, name);
1191                 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1192                         error = 0;
1193                 return error;
1194         }
1195
1196         if (ea_check_size(sdp, namel, size))
1197                 return -ERANGE;
1198
1199         if (!ip->i_eattr) {
1200                 if (flags & XATTR_REPLACE)
1201                         return -ENODATA;
1202                 return ea_init(ip, type, name, value, size);
1203         }
1204
1205         error = gfs2_ea_find(ip, type, name, &el);
1206         if (error)
1207                 return error;
1208
1209         if (el.el_ea) {
1210                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1211                         brelse(el.el_bh);
1212                         return -EPERM;
1213                 }
1214
1215                 error = -EEXIST;
1216                 if (!(flags & XATTR_CREATE)) {
1217                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1218                         error = ea_set_i(ip, type, name, value, size, &el);
1219                         if (!error && unstuffed)
1220                                 ea_set_remove_unstuffed(ip, &el);
1221                 }
1222
1223                 brelse(el.el_bh);
1224                 return error;
1225         }
1226
1227         error = -ENODATA;
1228         if (!(flags & XATTR_REPLACE))
1229                 error = ea_set_i(ip, type, name, value, size, NULL);
1230
1231         return error;
1232 }
1233
1234 static int gfs2_xattr_set(const struct xattr_handler *handler,
1235                           struct dentry *unused, struct inode *inode,
1236                           const char *name, const void *value,
1237                           size_t size, int flags)
1238 {
1239         struct gfs2_inode *ip = GFS2_I(inode);
1240         struct gfs2_holder gh;
1241         int ret;
1242
1243         ret = gfs2_rsqa_alloc(ip);
1244         if (ret)
1245                 return ret;
1246
1247         /* May be called from gfs_setattr with the glock locked. */
1248
1249         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1250                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1251                 if (ret)
1252                         return ret;
1253         } else {
1254                 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
1255                         return -EIO;
1256                 gfs2_holder_mark_uninitialized(&gh);
1257         }
1258         ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1259         if (gfs2_holder_initialized(&gh))
1260                 gfs2_glock_dq_uninit(&gh);
1261         return ret;
1262 }
1263
1264 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1265 {
1266         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1267         struct gfs2_rgrp_list rlist;
1268         struct buffer_head *indbh, *dibh;
1269         __be64 *eablk, *end;
1270         unsigned int rg_blocks = 0;
1271         u64 bstart = 0;
1272         unsigned int blen = 0;
1273         unsigned int blks = 0;
1274         unsigned int x;
1275         int error;
1276
1277         error = gfs2_rindex_update(sdp);
1278         if (error)
1279                 return error;
1280
1281         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1282
1283         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1284         if (error)
1285                 return error;
1286
1287         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1288                 error = -EIO;
1289                 goto out;
1290         }
1291
1292         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1293         end = eablk + sdp->sd_inptrs;
1294
1295         for (; eablk < end; eablk++) {
1296                 u64 bn;
1297
1298                 if (!*eablk)
1299                         break;
1300                 bn = be64_to_cpu(*eablk);
1301
1302                 if (bstart + blen == bn)
1303                         blen++;
1304                 else {
1305                         if (bstart)
1306                                 gfs2_rlist_add(ip, &rlist, bstart);
1307                         bstart = bn;
1308                         blen = 1;
1309                 }
1310                 blks++;
1311         }
1312         if (bstart)
1313                 gfs2_rlist_add(ip, &rlist, bstart);
1314         else
1315                 goto out;
1316
1317         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1318
1319         for (x = 0; x < rlist.rl_rgrps; x++) {
1320                 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1321
1322                 rg_blocks += rgd->rd_length;
1323         }
1324
1325         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1326         if (error)
1327                 goto out_rlist_free;
1328
1329         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1330                                  RES_STATFS + RES_QUOTA, blks);
1331         if (error)
1332                 goto out_gunlock;
1333
1334         gfs2_trans_add_meta(ip->i_gl, indbh);
1335
1336         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1337         bstart = 0;
1338         blen = 0;
1339
1340         for (; eablk < end; eablk++) {
1341                 u64 bn;
1342
1343                 if (!*eablk)
1344                         break;
1345                 bn = be64_to_cpu(*eablk);
1346
1347                 if (bstart + blen == bn)
1348                         blen++;
1349                 else {
1350                         if (bstart)
1351                                 gfs2_free_meta(ip, bstart, blen);
1352                         bstart = bn;
1353                         blen = 1;
1354                 }
1355
1356                 *eablk = 0;
1357                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1358         }
1359         if (bstart)
1360                 gfs2_free_meta(ip, bstart, blen);
1361
1362         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1363
1364         error = gfs2_meta_inode_buffer(ip, &dibh);
1365         if (!error) {
1366                 gfs2_trans_add_meta(ip->i_gl, dibh);
1367                 gfs2_dinode_out(ip, dibh->b_data);
1368                 brelse(dibh);
1369         }
1370
1371         gfs2_trans_end(sdp);
1372
1373 out_gunlock:
1374         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1375 out_rlist_free:
1376         gfs2_rlist_free(&rlist);
1377 out:
1378         brelse(indbh);
1379         return error;
1380 }
1381
1382 static int ea_dealloc_block(struct gfs2_inode *ip)
1383 {
1384         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1385         struct gfs2_rgrpd *rgd;
1386         struct buffer_head *dibh;
1387         struct gfs2_holder gh;
1388         int error;
1389
1390         error = gfs2_rindex_update(sdp);
1391         if (error)
1392                 return error;
1393
1394         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1395         if (!rgd) {
1396                 gfs2_consist_inode(ip);
1397                 return -EIO;
1398         }
1399
1400         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1401         if (error)
1402                 return error;
1403
1404         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1405                                  RES_QUOTA, 1);
1406         if (error)
1407                 goto out_gunlock;
1408
1409         gfs2_free_meta(ip, ip->i_eattr, 1);
1410
1411         ip->i_eattr = 0;
1412         gfs2_add_inode_blocks(&ip->i_inode, -1);
1413
1414         error = gfs2_meta_inode_buffer(ip, &dibh);
1415         if (!error) {
1416                 gfs2_trans_add_meta(ip->i_gl, dibh);
1417                 gfs2_dinode_out(ip, dibh->b_data);
1418                 brelse(dibh);
1419         }
1420
1421         gfs2_trans_end(sdp);
1422
1423 out_gunlock:
1424         gfs2_glock_dq_uninit(&gh);
1425         return error;
1426 }
1427
1428 /**
1429  * gfs2_ea_dealloc - deallocate the extended attribute fork
1430  * @ip: the inode
1431  *
1432  * Returns: errno
1433  */
1434
1435 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1436 {
1437         int error;
1438
1439         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1440         if (error)
1441                 return error;
1442
1443         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1444         if (error)
1445                 return error;
1446
1447         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1448         if (error)
1449                 goto out_quota;
1450
1451         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1452                 error = ea_dealloc_indirect(ip);
1453                 if (error)
1454                         goto out_quota;
1455         }
1456
1457         error = ea_dealloc_block(ip);
1458
1459 out_quota:
1460         gfs2_quota_unhold(ip);
1461         return error;
1462 }
1463
1464 static const struct xattr_handler gfs2_xattr_user_handler = {
1465         .prefix = XATTR_USER_PREFIX,
1466         .flags  = GFS2_EATYPE_USR,
1467         .get    = gfs2_xattr_get,
1468         .set    = gfs2_xattr_set,
1469 };
1470
1471 static const struct xattr_handler gfs2_xattr_security_handler = {
1472         .prefix = XATTR_SECURITY_PREFIX,
1473         .flags  = GFS2_EATYPE_SECURITY,
1474         .get    = gfs2_xattr_get,
1475         .set    = gfs2_xattr_set,
1476 };
1477
1478 const struct xattr_handler *gfs2_xattr_handlers[] = {
1479         &gfs2_xattr_user_handler,
1480         &gfs2_xattr_security_handler,
1481         &posix_acl_access_xattr_handler,
1482         &posix_acl_default_xattr_handler,
1483         NULL,
1484 };
1485