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 <asm/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 "trans.h"
  29 #include "util.h"
  30
  31 /**
  32  * ea_calc_size - returns the acutal number of bytes the request will take up
  33  *                (not counting any unstuffed data blocks)
  34  * @sdp:
  35  * @er:
  36  * @size:
  37  *
  38  * Returns: 1 if the EA should be stuffed
  39  */
  40
  41 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  42                         unsigned int *size)
  43 {
  44         unsigned int jbsize = sdp->sd_jbsize;
  45
  46         /* Stuffed */
  47         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  48
  49         if (*size <= jbsize)
  50                 return 1;
  51
  52         /* Unstuffed */
  53         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  54                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  55
  56         return 0;
  57 }
  58
  59 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  60 {
  61         unsigned int size;
  62
  63         if (dsize > GFS2_EA_MAX_DATA_LEN)
  64                 return -ERANGE;
  65
  66         ea_calc_size(sdp, nsize, dsize, &size);
  67
  68         /* This can only happen with 512 byte blocks */
  69         if (size > sdp->sd_jbsize)
  70                 return -ERANGE;
  71
  72         return 0;
  73 }
  74
  75 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  76                           struct gfs2_ea_header *ea,
  77                           struct gfs2_ea_header *prev, void *private);
  78
  79 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  80                         ea_call_t ea_call, void *data)
  81 {
  82         struct gfs2_ea_header *ea, *prev = NULL;
  83         int error = 0;
  84
  85         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  86                 return -EIO;
  87
  88         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  89                 if (!GFS2_EA_REC_LEN(ea))
  90                         goto fail;
  91                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  92                                                   bh->b_data + bh->b_size))
  93                         goto fail;
  94                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  95                         goto fail;
  96
  97                 error = ea_call(ip, bh, ea, prev, data);
  98                 if (error)
  99                         return error;
 100
 101                 if (GFS2_EA_IS_LAST(ea)) {
 102                         if ((char *)GFS2_EA2NEXT(ea) !=
 103                             bh->b_data + bh->b_size)
 104                                 goto fail;
 105                         break;
 106                 }
 107         }
 108
 109         return error;
 110
 111 fail:
 112         gfs2_consist_inode(ip);
 113         return -EIO;
 114 }
 115
 116 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 117 {
 118         struct buffer_head *bh, *eabh;
 119         __be64 *eablk, *end;
 120         int error;
 121
 122         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 123         if (error)
 124                 return error;
 125
 126         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 127                 error = ea_foreach_i(ip, bh, ea_call, data);
 128                 goto out;
 129         }
 130
 131         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 132                 error = -EIO;
 133                 goto out;
 134         }
 135
 136         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 137         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 138
 139         for (; eablk < end; eablk++) {
 140                 u64 bn;
 141
 142                 if (!*eablk)
 143                         break;
 144                 bn = be64_to_cpu(*eablk);
 145
 146                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 147                 if (error)
 148                         break;
 149                 error = ea_foreach_i(ip, eabh, ea_call, data);
 150                 brelse(eabh);
 151                 if (error)
 152                         break;
 153         }
 154 out:
 155         brelse(bh);
 156         return error;
 157 }
 158
 159 struct ea_find {
 160         int type;
 161         const char *name;
 162         size_t namel;
 163         struct gfs2_ea_location *ef_el;
 164 };
 165
 166 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 167                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 168                      void *private)
 169 {
 170         struct ea_find *ef = private;
 171
 172         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 173                 return 0;
 174
 175         if (ea->ea_type == ef->type) {
 176                 if (ea->ea_name_len == ef->namel &&
 177                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 178                         struct gfs2_ea_location *el = ef->ef_el;
 179                         get_bh(bh);
 180                         el->el_bh = bh;
 181                         el->el_ea = ea;
 182                         el->el_prev = prev;
 183                         return 1;
 184                 }
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 191                         struct gfs2_ea_location *el)
 192 {
 193         struct ea_find ef;
 194         int error;
 195
 196         ef.type = type;
 197         ef.name = name;
 198         ef.namel = strlen(name);
 199         ef.ef_el = el;
 200
 201         memset(el, 0, sizeof(struct gfs2_ea_location));
 202
 203         error = ea_foreach(ip, ea_find_i, &ef);
 204         if (error > 0)
 205                 return 0;
 206
 207         return error;
 208 }
 209
 210 /**
 211  * ea_dealloc_unstuffed -
 212  * @ip:
 213  * @bh:
 214  * @ea:
 215  * @prev:
 216  * @private:
 217  *
 218  * Take advantage of the fact that all unstuffed blocks are
 219  * allocated from the same RG.  But watch, this may not always
 220  * be true.
 221  *
 222  * Returns: errno
 223  */
 224
 225 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 226                                 struct gfs2_ea_header *ea,
 227                                 struct gfs2_ea_header *prev, void *private)
 228 {
 229         int *leave = private;
 230         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 231         struct gfs2_rgrpd *rgd;
 232         struct gfs2_holder rg_gh;
 233         struct buffer_head *dibh;
 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         error = gfs2_meta_inode_buffer(ip, &dibh);
 311         if (!error) {
 312                 ip->i_inode.i_ctime = CURRENT_TIME;
 313                 gfs2_trans_add_meta(ip->i_gl, dibh);
 314                 gfs2_dinode_out(ip, dibh->b_data);
 315                 brelse(dibh);
 316         }
 317
 318         gfs2_trans_end(sdp);
 319
 320 out_gunlock:
 321         gfs2_glock_dq_uninit(&rg_gh);
 322         return error;
 323 }
 324
 325 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 326                                struct gfs2_ea_header *ea,
 327                                struct gfs2_ea_header *prev, int leave)
 328 {
 329         int error;
 330
 331         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 332         if (error)
 333                 return error;
 334
 335         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 336         if (error)
 337                 goto out_alloc;
 338
 339         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341         gfs2_quota_unhold(ip);
 342 out_alloc:
 343         return error;
 344 }
 345
 346 struct ea_list {
 347         struct gfs2_ea_request *ei_er;
 348         unsigned int ei_size;
 349 };
 350
 351 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 352 {
 353         switch (ea->ea_type) {
 354         case GFS2_EATYPE_USR:
 355                 return 5 + ea->ea_name_len + 1;
 356         case GFS2_EATYPE_SYS:
 357                 return 7 + ea->ea_name_len + 1;
 358         case GFS2_EATYPE_SECURITY:
 359                 return 9 + ea->ea_name_len + 1;
 360         default:
 361                 return 0;
 362         }
 363 }
 364
 365 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 366                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 367                      void *private)
 368 {
 369         struct ea_list *ei = private;
 370         struct gfs2_ea_request *er = ei->ei_er;
 371         unsigned int ea_size = gfs2_ea_strlen(ea);
 372
 373         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 374                 return 0;
 375
 376         if (er->er_data_len) {
 377                 char *prefix = NULL;
 378                 unsigned int l = 0;
 379                 char c = 0;
 380
 381                 if (ei->ei_size + ea_size > er->er_data_len)
 382                         return -ERANGE;
 383
 384                 switch (ea->ea_type) {
 385                 case GFS2_EATYPE_USR:
 386                         prefix = "user.";
 387                         l = 5;
 388                         break;
 389                 case GFS2_EATYPE_SYS:
 390                         prefix = "system.";
 391                         l = 7;
 392                         break;
 393                 case GFS2_EATYPE_SECURITY:
 394                         prefix = "security.";
 395                         l = 9;
 396                         break;
 397                 }
 398
 399                 BUG_ON(l == 0);
 400
 401                 memcpy(er->er_data + ei->ei_size, prefix, l);
 402                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 403                        ea->ea_name_len);
 404                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 405         }
 406
 407         ei->ei_size += ea_size;
 408
 409         return 0;
 410 }
 411
 412 /**
 413  * gfs2_listxattr - List gfs2 extended attributes
 414  * @dentry: The dentry whose inode we are interested in
 415  * @buffer: The buffer to write the results
 416  * @size: The size of the buffer
 417  *
 418  * Returns: actual size of data on success, -errno on error
 419  */
 420
 421 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 422 {
 423         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 424         struct gfs2_ea_request er;
 425         struct gfs2_holder i_gh;
 426         int error;
 427
 428         memset(&er, 0, sizeof(struct gfs2_ea_request));
 429         if (size) {
 430                 er.er_data = buffer;
 431                 er.er_data_len = size;
 432         }
 433
 434         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 435         if (error)
 436                 return error;
 437
 438         if (ip->i_eattr) {
 439                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 440
 441                 error = ea_foreach(ip, ea_list_i, &ei);
 442                 if (!error)
 443                         error = ei.ei_size;
 444         }
 445
 446         gfs2_glock_dq_uninit(&i_gh);
 447
 448         return error;
 449 }
 450
 451 /**
 452  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 453  *                     request buffer
 454  * @ip: The GFS2 inode
 455  * @ea: The extended attribute header structure
 456  * @din: The data to be copied in
 457  * @dout: The data to be copied out (one of din,dout will be NULL)
 458  *
 459  * Returns: errno
 460  */
 461
 462 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 463                                const char *din, char *dout)
 464 {
 465         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 466         struct buffer_head **bh;
 467         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 468         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 469         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 470         unsigned int x;
 471         int error = 0;
 472         unsigned char *pos;
 473         unsigned cp_size;
 474
 475         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 476         if (!bh)
 477                 return -ENOMEM;
 478
 479         for (x = 0; x < nptrs; x++) {
 480                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 481                                        bh + x);
 482                 if (error) {
 483                         while (x--)
 484                                 brelse(bh[x]);
 485                         goto out;
 486                 }
 487                 dataptrs++;
 488         }
 489
 490         for (x = 0; x < nptrs; x++) {
 491                 error = gfs2_meta_wait(sdp, bh[x]);
 492                 if (error) {
 493                         for (; x < nptrs; x++)
 494                                 brelse(bh[x]);
 495                         goto out;
 496                 }
 497                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 498                         for (; x < nptrs; x++)
 499                                 brelse(bh[x]);
 500                         error = -EIO;
 501                         goto out;
 502                 }
 503
 504                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 505                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 506
 507                 if (dout) {
 508                         memcpy(dout, pos, cp_size);
 509                         dout += sdp->sd_jbsize;
 510                 }
 511
 512                 if (din) {
 513                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 514                         memcpy(pos, din, cp_size);
 515                         din += sdp->sd_jbsize;
 516                 }
 517
 518                 amount -= sdp->sd_jbsize;
 519                 brelse(bh[x]);
 520         }
 521
 522 out:
 523         kfree(bh);
 524         return error;
 525 }
 526
 527 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 528                             char *data, size_t size)
 529 {
 530         int ret;
 531         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 532         if (len > size)
 533                 return -ERANGE;
 534
 535         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 536                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 537                 return len;
 538         }
 539         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 540         if (ret < 0)
 541                 return ret;
 542         return len;
 543 }
 544
 545 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 546 {
 547         struct gfs2_ea_location el;
 548         int error;
 549         int len;
 550         char *data;
 551
 552         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 553         if (error)
 554                 return error;
 555         if (!el.el_ea)
 556                 goto out;
 557         if (!GFS2_EA_DATA_LEN(el.el_ea))
 558                 goto out;
 559
 560         len = GFS2_EA_DATA_LEN(el.el_ea);
 561         data = kmalloc(len, GFP_NOFS);
 562         error = -ENOMEM;
 563         if (data == NULL)
 564                 goto out;
 565
 566         error = gfs2_ea_get_copy(ip, &el, data, len);
 567         if (error < 0)
 568                 kfree(data);
 569         else
 570                 *ppdata = data;
 571 out:
 572         brelse(el.el_bh);
 573         return error;
 574 }
 575
 576 /**
 577  * gfs2_xattr_get - Get a GFS2 extended attribute
 578  * @inode: The inode
 579  * @name: The name of the extended attribute
 580  * @buffer: The buffer to write the result into
 581  * @size: The size of the buffer
 582  * @type: The type of extended attribute
 583  *
 584  * Returns: actual size of data on success, -errno on error
 585  */
 586 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
 587                 void *buffer, size_t size, int type)
 588 {
 589         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 590         struct gfs2_ea_location el;
 591         int error;
 592
 593         if (!ip->i_eattr)
 594                 return -ENODATA;
 595         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 596                 return -EINVAL;
 597
 598         error = gfs2_ea_find(ip, type, name, &el);
 599         if (error)
 600                 return error;
 601         if (!el.el_ea)
 602                 return -ENODATA;
 603         if (size)
 604                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 605         else
 606                 error = GFS2_EA_DATA_LEN(el.el_ea);
 607         brelse(el.el_bh);
 608
 609         return error;
 610 }
 611
 612 /**
 613  * ea_alloc_blk - allocates a new block for extended attributes.
 614  * @ip: A pointer to the inode that's getting extended attributes
 615  * @bhp: Pointer to pointer to a struct buffer_head
 616  *
 617  * Returns: errno
 618  */
 619
 620 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 621 {
 622         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 623         struct gfs2_ea_header *ea;
 624         unsigned int n = 1;
 625         u64 block;
 626         int error;
 627
 628         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 629         if (error)
 630                 return error;
 631         gfs2_trans_add_unrevoke(sdp, block, 1);
 632         *bhp = gfs2_meta_new(ip->i_gl, block);
 633         gfs2_trans_add_meta(ip->i_gl, *bhp);
 634         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 635         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 636
 637         ea = GFS2_EA_BH2FIRST(*bhp);
 638         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 639         ea->ea_type = GFS2_EATYPE_UNUSED;
 640         ea->ea_flags = GFS2_EAFLAG_LAST;
 641         ea->ea_num_ptrs = 0;
 642
 643         gfs2_add_inode_blocks(&ip->i_inode, 1);
 644
 645         return 0;
 646 }
 647
 648 /**
 649  * ea_write - writes the request info to an ea, creating new blocks if
 650  *            necessary
 651  * @ip: inode that is being modified
 652  * @ea: the location of the new ea in a block
 653  * @er: the write request
 654  *
 655  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 656  *
 657  * returns : errno
 658  */
 659
 660 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 661                     struct gfs2_ea_request *er)
 662 {
 663         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 664         int error;
 665
 666         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 667         ea->ea_name_len = er->er_name_len;
 668         ea->ea_type = er->er_type;
 669         ea->__pad = 0;
 670
 671         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 672
 673         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 674                 ea->ea_num_ptrs = 0;
 675                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 676         } else {
 677                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 678                 const char *data = er->er_data;
 679                 unsigned int data_len = er->er_data_len;
 680                 unsigned int copy;
 681                 unsigned int x;
 682
 683                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 684                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 685                         struct buffer_head *bh;
 686                         u64 block;
 687                         int mh_size = sizeof(struct gfs2_meta_header);
 688                         unsigned int n = 1;
 689
 690                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 691                         if (error)
 692                                 return error;
 693                         gfs2_trans_add_unrevoke(sdp, block, 1);
 694                         bh = gfs2_meta_new(ip->i_gl, block);
 695                         gfs2_trans_add_meta(ip->i_gl, bh);
 696                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 697
 698                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 699
 700                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 701                                                            data_len;
 702                         memcpy(bh->b_data + mh_size, data, copy);
 703                         if (copy < sdp->sd_jbsize)
 704                                 memset(bh->b_data + mh_size + copy, 0,
 705                                        sdp->sd_jbsize - copy);
 706
 707                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 708                         data += copy;
 709                         data_len -= copy;
 710
 711                         brelse(bh);
 712                 }
 713
 714                 gfs2_assert_withdraw(sdp, !data_len);
 715         }
 716
 717         return 0;
 718 }
 719
 720 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 721                                    struct gfs2_ea_request *er, void *private);
 722
 723 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 724                              unsigned int blks,
 725                              ea_skeleton_call_t skeleton_call, void *private)
 726 {
 727         struct gfs2_alloc_parms ap = { .target = blks };
 728         struct buffer_head *dibh;
 729         int error;
 730
 731         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 732         if (error)
 733                 return error;
 734
 735         error = gfs2_quota_lock_check(ip);
 736         if (error)
 737                 return error;
 738
 739         error = gfs2_inplace_reserve(ip, &ap);
 740         if (error)
 741                 goto out_gunlock_q;
 742
 743         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 744                                  blks + gfs2_rg_blocks(ip, blks) +
 745                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 746         if (error)
 747                 goto out_ipres;
 748
 749         error = skeleton_call(ip, er, private);
 750         if (error)
 751                 goto out_end_trans;
 752
 753         error = gfs2_meta_inode_buffer(ip, &dibh);
 754         if (!error) {
 755                 ip->i_inode.i_ctime = CURRENT_TIME;
 756                 gfs2_trans_add_meta(ip->i_gl, dibh);
 757                 gfs2_dinode_out(ip, dibh->b_data);
 758                 brelse(dibh);
 759         }
 760
 761 out_end_trans:
 762         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 763 out_ipres:
 764         gfs2_inplace_release(ip);
 765 out_gunlock_q:
 766         gfs2_quota_unlock(ip);
 767         return error;
 768 }
 769
 770 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 771                      void *private)
 772 {
 773         struct buffer_head *bh;
 774         int error;
 775
 776         error = ea_alloc_blk(ip, &bh);
 777         if (error)
 778                 return error;
 779
 780         ip->i_eattr = bh->b_blocknr;
 781         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 782
 783         brelse(bh);
 784
 785         return error;
 786 }
 787
 788 /**
 789  * ea_init - initializes a new eattr block
 790  * @ip:
 791  * @er:
 792  *
 793  * Returns: errno
 794  */
 795
 796 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 797                    const void *data, size_t size)
 798 {
 799         struct gfs2_ea_request er;
 800         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 801         unsigned int blks = 1;
 802
 803         er.er_type = type;
 804         er.er_name = name;
 805         er.er_name_len = strlen(name);
 806         er.er_data = (void *)data;
 807         er.er_data_len = size;
 808
 809         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 810                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 811
 812         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 813 }
 814
 815 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 816 {
 817         u32 ea_size = GFS2_EA_SIZE(ea);
 818         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 819                                      ea_size);
 820         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 821         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 822
 823         ea->ea_rec_len = cpu_to_be32(ea_size);
 824         ea->ea_flags ^= last;
 825
 826         new->ea_rec_len = cpu_to_be32(new_size);
 827         new->ea_flags = last;
 828
 829         return new;
 830 }
 831
 832 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 833                                   struct gfs2_ea_location *el)
 834 {
 835         struct gfs2_ea_header *ea = el->el_ea;
 836         struct gfs2_ea_header *prev = el->el_prev;
 837         u32 len;
 838
 839         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 840
 841         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 842                 ea->ea_type = GFS2_EATYPE_UNUSED;
 843                 return;
 844         } else if (GFS2_EA2NEXT(prev) != ea) {
 845                 prev = GFS2_EA2NEXT(prev);
 846                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 847         }
 848
 849         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 850         prev->ea_rec_len = cpu_to_be32(len);
 851
 852         if (GFS2_EA_IS_LAST(ea))
 853                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 854 }
 855
 856 struct ea_set {
 857         int ea_split;
 858
 859         struct gfs2_ea_request *es_er;
 860         struct gfs2_ea_location *es_el;
 861
 862         struct buffer_head *es_bh;
 863         struct gfs2_ea_header *es_ea;
 864 };
 865
 866 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 867                                  struct gfs2_ea_header *ea, struct ea_set *es)
 868 {
 869         struct gfs2_ea_request *er = es->es_er;
 870         struct buffer_head *dibh;
 871         int error;
 872
 873         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 874         if (error)
 875                 return error;
 876
 877         gfs2_trans_add_meta(ip->i_gl, bh);
 878
 879         if (es->ea_split)
 880                 ea = ea_split_ea(ea);
 881
 882         ea_write(ip, ea, er);
 883
 884         if (es->es_el)
 885                 ea_set_remove_stuffed(ip, es->es_el);
 886
 887         error = gfs2_meta_inode_buffer(ip, &dibh);
 888         if (error)
 889                 goto out;
 890         ip->i_inode.i_ctime = CURRENT_TIME;
 891         gfs2_trans_add_meta(ip->i_gl, dibh);
 892         gfs2_dinode_out(ip, dibh->b_data);
 893         brelse(dibh);
 894 out:
 895         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 896         return error;
 897 }
 898
 899 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 900                                struct gfs2_ea_request *er, void *private)
 901 {
 902         struct ea_set *es = private;
 903         struct gfs2_ea_header *ea = es->es_ea;
 904         int error;
 905
 906         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 907
 908         if (es->ea_split)
 909                 ea = ea_split_ea(ea);
 910
 911         error = ea_write(ip, ea, er);
 912         if (error)
 913                 return error;
 914
 915         if (es->es_el)
 916                 ea_set_remove_stuffed(ip, es->es_el);
 917
 918         return 0;
 919 }
 920
 921 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 922                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 923                          void *private)
 924 {
 925         struct ea_set *es = private;
 926         unsigned int size;
 927         int stuffed;
 928         int error;
 929
 930         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 931                                es->es_er->er_data_len, &size);
 932
 933         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 934                 if (GFS2_EA_REC_LEN(ea) < size)
 935                         return 0;
 936                 if (!GFS2_EA_IS_STUFFED(ea)) {
 937                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 938                         if (error)
 939                                 return error;
 940                 }
 941                 es->ea_split = 0;
 942         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 943                 es->ea_split = 1;
 944         else
 945                 return 0;
 946
 947         if (stuffed) {
 948                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 949                 if (error)
 950                         return error;
 951         } else {
 952                 unsigned int blks;
 953
 954                 es->es_bh = bh;
 955                 es->es_ea = ea;
 956                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 957                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 958
 959                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 960                                           ea_set_simple_alloc, es);
 961                 if (error)
 962                         return error;
 963         }
 964
 965         return 1;
 966 }
 967
 968 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 969                         void *private)
 970 {
 971         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 972         struct buffer_head *indbh, *newbh;
 973         __be64 *eablk;
 974         int error;
 975         int mh_size = sizeof(struct gfs2_meta_header);
 976
 977         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 978                 __be64 *end;
 979
 980                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 981                                        &indbh);
 982                 if (error)
 983                         return error;
 984
 985                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 986                         error = -EIO;
 987                         goto out;
 988                 }
 989
 990                 eablk = (__be64 *)(indbh->b_data + mh_size);
 991                 end = eablk + sdp->sd_inptrs;
 992
 993                 for (; eablk < end; eablk++)
 994                         if (!*eablk)
 995                                 break;
 996
 997                 if (eablk == end) {
 998                         error = -ENOSPC;
 999                         goto out;
1000                 }
1001
1002                 gfs2_trans_add_meta(ip->i_gl, indbh);
1003         } else {
1004                 u64 blk;
1005                 unsigned int n = 1;
1006                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1007                 if (error)
1008                         return error;
1009                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1010                 indbh = gfs2_meta_new(ip->i_gl, blk);
1011                 gfs2_trans_add_meta(ip->i_gl, indbh);
1012                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1013                 gfs2_buffer_clear_tail(indbh, mh_size);
1014
1015                 eablk = (__be64 *)(indbh->b_data + mh_size);
1016                 *eablk = cpu_to_be64(ip->i_eattr);
1017                 ip->i_eattr = blk;
1018                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1019                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1020
1021                 eablk++;
1022         }
1023
1024         error = ea_alloc_blk(ip, &newbh);
1025         if (error)
1026                 goto out;
1027
1028         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1029         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1030         brelse(newbh);
1031         if (error)
1032                 goto out;
1033
1034         if (private)
1035                 ea_set_remove_stuffed(ip, private);
1036
1037 out:
1038         brelse(indbh);
1039         return error;
1040 }
1041
1042 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1043                     const void *value, size_t size, struct gfs2_ea_location *el)
1044 {
1045         struct gfs2_ea_request er;
1046         struct ea_set es;
1047         unsigned int blks = 2;
1048         int error;
1049
1050         er.er_type = type;
1051         er.er_name = name;
1052         er.er_data = (void *)value;
1053         er.er_name_len = strlen(name);
1054         er.er_data_len = size;
1055
1056         memset(&es, 0, sizeof(struct ea_set));
1057         es.es_er = &er;
1058         es.es_el = el;
1059
1060         error = ea_foreach(ip, ea_set_simple, &es);
1061         if (error > 0)
1062                 return 0;
1063         if (error)
1064                 return error;
1065
1066         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1067                 blks++;
1068         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1069                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1070
1071         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1072 }
1073
1074 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1075                                    struct gfs2_ea_location *el)
1076 {
1077         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1078                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1079                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1080                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1081         }
1082
1083         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1084 }
1085
1086 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1087 {
1088         struct gfs2_ea_header *ea = el->el_ea;
1089         struct gfs2_ea_header *prev = el->el_prev;
1090         struct buffer_head *dibh;
1091         int error;
1092
1093         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1094         if (error)
1095                 return error;
1096
1097         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1098
1099         if (prev) {
1100                 u32 len;
1101
1102                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1103                 prev->ea_rec_len = cpu_to_be32(len);
1104
1105                 if (GFS2_EA_IS_LAST(ea))
1106                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1107         } else {
1108                 ea->ea_type = GFS2_EATYPE_UNUSED;
1109         }
1110
1111         error = gfs2_meta_inode_buffer(ip, &dibh);
1112         if (!error) {
1113                 ip->i_inode.i_ctime = CURRENT_TIME;
1114                 gfs2_trans_add_meta(ip->i_gl, dibh);
1115                 gfs2_dinode_out(ip, dibh->b_data);
1116                 brelse(dibh);
1117         }
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                 return gfs2_xattr_remove(ip, type, name);
1191
1192         if (ea_check_size(sdp, namel, size))
1193                 return -ERANGE;
1194
1195         if (!ip->i_eattr) {
1196                 if (flags & XATTR_REPLACE)
1197                         return -ENODATA;
1198                 return ea_init(ip, type, name, value, size);
1199         }
1200
1201         error = gfs2_ea_find(ip, type, name, &el);
1202         if (error)
1203                 return error;
1204
1205         if (el.el_ea) {
1206                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1207                         brelse(el.el_bh);
1208                         return -EPERM;
1209                 }
1210
1211                 error = -EEXIST;
1212                 if (!(flags & XATTR_CREATE)) {
1213                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1214                         error = ea_set_i(ip, type, name, value, size, &el);
1215                         if (!error && unstuffed)
1216                                 ea_set_remove_unstuffed(ip, &el);
1217                 }
1218
1219                 brelse(el.el_bh);
1220                 return error;
1221         }
1222
1223         error = -ENODATA;
1224         if (!(flags & XATTR_REPLACE))
1225                 error = ea_set_i(ip, type, name, value, size, NULL);
1226
1227         return error;
1228 }
1229
1230 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1231                 const void *value, size_t size, int flags, int type)
1232 {
1233         return __gfs2_xattr_set(dentry->d_inode, name, value,
1234                                 size, flags, type);
1235 }
1236
1237
1238 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1239                                   struct gfs2_ea_header *ea, char *data)
1240 {
1241         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1242         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1243         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1244         int ret;
1245
1246         ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1247         if (ret)
1248                 return ret;
1249
1250         ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1251         gfs2_trans_end(sdp);
1252
1253         return ret;
1254 }
1255
1256 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1257 {
1258         struct inode *inode = &ip->i_inode;
1259         struct gfs2_sbd *sdp = GFS2_SB(inode);
1260         struct gfs2_ea_location el;
1261         int error;
1262
1263         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1264         if (error)
1265                 return error;
1266
1267         if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1268                 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1269                 if (error == 0) {
1270                         gfs2_trans_add_meta(ip->i_gl, el.el_bh);
1271                         memcpy(GFS2_EA2DATA(el.el_ea), data,
1272                                GFS2_EA_DATA_LEN(el.el_ea));
1273                 }
1274         } else {
1275                 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1276         }
1277
1278         brelse(el.el_bh);
1279         if (error)
1280                 return error;
1281
1282         error = gfs2_setattr_simple(inode, attr);
1283         gfs2_trans_end(sdp);
1284         return error;
1285 }
1286
1287 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1288 {
1289         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1290         struct gfs2_rgrp_list rlist;
1291         struct buffer_head *indbh, *dibh;
1292         __be64 *eablk, *end;
1293         unsigned int rg_blocks = 0;
1294         u64 bstart = 0;
1295         unsigned int blen = 0;
1296         unsigned int blks = 0;
1297         unsigned int x;
1298         int error;
1299
1300         error = gfs2_rindex_update(sdp);
1301         if (error)
1302                 return error;
1303
1304         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1305
1306         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1307         if (error)
1308                 return error;
1309
1310         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1311                 error = -EIO;
1312                 goto out;
1313         }
1314
1315         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1316         end = eablk + sdp->sd_inptrs;
1317
1318         for (; eablk < end; eablk++) {
1319                 u64 bn;
1320
1321                 if (!*eablk)
1322                         break;
1323                 bn = be64_to_cpu(*eablk);
1324
1325                 if (bstart + blen == bn)
1326                         blen++;
1327                 else {
1328                         if (bstart)
1329                                 gfs2_rlist_add(ip, &rlist, bstart);
1330                         bstart = bn;
1331                         blen = 1;
1332                 }
1333                 blks++;
1334         }
1335         if (bstart)
1336                 gfs2_rlist_add(ip, &rlist, bstart);
1337         else
1338                 goto out;
1339
1340         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1341
1342         for (x = 0; x < rlist.rl_rgrps; x++) {
1343                 struct gfs2_rgrpd *rgd;
1344                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1345                 rg_blocks += rgd->rd_length;
1346         }
1347
1348         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1349         if (error)
1350                 goto out_rlist_free;
1351
1352         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1353                                  RES_STATFS + RES_QUOTA, blks);
1354         if (error)
1355                 goto out_gunlock;
1356
1357         gfs2_trans_add_meta(ip->i_gl, indbh);
1358
1359         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1360         bstart = 0;
1361         blen = 0;
1362
1363         for (; eablk < end; eablk++) {
1364                 u64 bn;
1365
1366                 if (!*eablk)
1367                         break;
1368                 bn = be64_to_cpu(*eablk);
1369
1370                 if (bstart + blen == bn)
1371                         blen++;
1372                 else {
1373                         if (bstart)
1374                                 gfs2_free_meta(ip, bstart, blen);
1375                         bstart = bn;
1376                         blen = 1;
1377                 }
1378
1379                 *eablk = 0;
1380                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1381         }
1382         if (bstart)
1383                 gfs2_free_meta(ip, bstart, blen);
1384
1385         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1386
1387         error = gfs2_meta_inode_buffer(ip, &dibh);
1388         if (!error) {
1389                 gfs2_trans_add_meta(ip->i_gl, dibh);
1390                 gfs2_dinode_out(ip, dibh->b_data);
1391                 brelse(dibh);
1392         }
1393
1394         gfs2_trans_end(sdp);
1395
1396 out_gunlock:
1397         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1398 out_rlist_free:
1399         gfs2_rlist_free(&rlist);
1400 out:
1401         brelse(indbh);
1402         return error;
1403 }
1404
1405 static int ea_dealloc_block(struct gfs2_inode *ip)
1406 {
1407         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1408         struct gfs2_rgrpd *rgd;
1409         struct buffer_head *dibh;
1410         struct gfs2_holder gh;
1411         int error;
1412
1413         error = gfs2_rindex_update(sdp);
1414         if (error)
1415                 return error;
1416
1417         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1418         if (!rgd) {
1419                 gfs2_consist_inode(ip);
1420                 return -EIO;
1421         }
1422
1423         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1424         if (error)
1425                 return error;
1426
1427         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1428                                  RES_QUOTA, 1);
1429         if (error)
1430                 goto out_gunlock;
1431
1432         gfs2_free_meta(ip, ip->i_eattr, 1);
1433
1434         ip->i_eattr = 0;
1435         gfs2_add_inode_blocks(&ip->i_inode, -1);
1436
1437         error = gfs2_meta_inode_buffer(ip, &dibh);
1438         if (!error) {
1439                 gfs2_trans_add_meta(ip->i_gl, dibh);
1440                 gfs2_dinode_out(ip, dibh->b_data);
1441                 brelse(dibh);
1442         }
1443
1444         gfs2_trans_end(sdp);
1445
1446 out_gunlock:
1447         gfs2_glock_dq_uninit(&gh);
1448         return error;
1449 }
1450
1451 /**
1452  * gfs2_ea_dealloc - deallocate the extended attribute fork
1453  * @ip: the inode
1454  *
1455  * Returns: errno
1456  */
1457
1458 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1459 {
1460         int error;
1461
1462         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1463         if (error)
1464                 return error;
1465
1466         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1467         if (error)
1468                 return error;
1469
1470         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1471         if (error)
1472                 goto out_quota;
1473
1474         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1475                 error = ea_dealloc_indirect(ip);
1476                 if (error)
1477                         goto out_quota;
1478         }
1479
1480         error = ea_dealloc_block(ip);
1481
1482 out_quota:
1483         gfs2_quota_unhold(ip);
1484         return error;
1485 }
1486
1487 static const struct xattr_handler gfs2_xattr_user_handler = {
1488         .prefix = XATTR_USER_PREFIX,
1489         .flags  = GFS2_EATYPE_USR,
1490         .get    = gfs2_xattr_get,
1491         .set    = gfs2_xattr_set,
1492 };
1493
1494 static const struct xattr_handler gfs2_xattr_security_handler = {
1495         .prefix = XATTR_SECURITY_PREFIX,
1496         .flags  = GFS2_EATYPE_SECURITY,
1497         .get    = gfs2_xattr_get,
1498         .set    = gfs2_xattr_set,
1499 };
1500
1501 const struct xattr_handler *gfs2_xattr_handlers[] = {
1502         &gfs2_xattr_user_handler,
1503         &gfs2_xattr_security_handler,
1504         &posix_acl_access_xattr_handler,
1505         &posix_acl_default_xattr_handler,
1506         NULL,
1507 };
1508