fs/gfs2/xattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <asm/uaccess.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "acl.h"
  21 #include "xattr.h"
  22 #include "glock.h"
  23 #include "inode.h"
  24 #include "meta_io.h"
  25 #include "quota.h"
  26 #include "rgrp.h"
  27 #include "trans.h"
  28 #include "util.h"
  29
  30 /**
  31  * ea_calc_size - returns the acutal number of bytes the request will take up
  32  *                (not counting any unstuffed data blocks)
  33  * @sdp:
  34  * @er:
  35  * @size:
  36  *
  37  * Returns: 1 if the EA should be stuffed
  38  */
  39
  40 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  41                         unsigned int *size)
  42 {
  43         unsigned int jbsize = sdp->sd_jbsize;
  44
  45         /* Stuffed */
  46         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  47
  48         if (*size <= jbsize)
  49                 return 1;
  50
  51         /* Unstuffed */
  52         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  53                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  54
  55         return 0;
  56 }
  57
  58 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  59 {
  60         unsigned int size;
  61
  62         if (dsize > GFS2_EA_MAX_DATA_LEN)
  63                 return -ERANGE;
  64
  65         ea_calc_size(sdp, nsize, dsize, &size);
  66
  67         /* This can only happen with 512 byte blocks */
  68         if (size > sdp->sd_jbsize)
  69                 return -ERANGE;
  70
  71         return 0;
  72 }
  73
  74 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  75                           struct gfs2_ea_header *ea,
  76                           struct gfs2_ea_header *prev, void *private);
  77
  78 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  79                         ea_call_t ea_call, void *data)
  80 {
  81         struct gfs2_ea_header *ea, *prev = NULL;
  82         int error = 0;
  83
  84         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  85                 return -EIO;
  86
  87         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  88                 if (!GFS2_EA_REC_LEN(ea))
  89                         goto fail;
  90                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  91                                                   bh->b_data + bh->b_size))
  92                         goto fail;
  93                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  94                         goto fail;
  95
  96                 error = ea_call(ip, bh, ea, prev, data);
  97                 if (error)
  98                         return error;
  99
 100                 if (GFS2_EA_IS_LAST(ea)) {
 101                         if ((char *)GFS2_EA2NEXT(ea) !=
 102                             bh->b_data + bh->b_size)
 103                                 goto fail;
 104                         break;
 105                 }
 106         }
 107
 108         return error;
 109
 110 fail:
 111         gfs2_consist_inode(ip);
 112         return -EIO;
 113 }
 114
 115 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116 {
 117         struct buffer_head *bh, *eabh;
 118         __be64 *eablk, *end;
 119         int error;
 120
 121         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 122         if (error)
 123                 return error;
 124
 125         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 126                 error = ea_foreach_i(ip, bh, ea_call, data);
 127                 goto out;
 128         }
 129
 130         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 131                 error = -EIO;
 132                 goto out;
 133         }
 134
 135         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 136         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 137
 138         for (; eablk < end; eablk++) {
 139                 u64 bn;
 140
 141                 if (!*eablk)
 142                         break;
 143                 bn = be64_to_cpu(*eablk);
 144
 145                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 146                 if (error)
 147                         break;
 148                 error = ea_foreach_i(ip, eabh, ea_call, data);
 149                 brelse(eabh);
 150                 if (error)
 151                         break;
 152         }
 153 out:
 154         brelse(bh);
 155         return error;
 156 }
 157
 158 struct ea_find {
 159         int type;
 160         const char *name;
 161         size_t namel;
 162         struct gfs2_ea_location *ef_el;
 163 };
 164
 165 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 166                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 167                      void *private)
 168 {
 169         struct ea_find *ef = private;
 170
 171         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 172                 return 0;
 173
 174         if (ea->ea_type == ef->type) {
 175                 if (ea->ea_name_len == ef->namel &&
 176                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 177                         struct gfs2_ea_location *el = ef->ef_el;
 178                         get_bh(bh);
 179                         el->el_bh = bh;
 180                         el->el_ea = ea;
 181                         el->el_prev = prev;
 182                         return 1;
 183                 }
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 190                         struct gfs2_ea_location *el)
 191 {
 192         struct ea_find ef;
 193         int error;
 194
 195         ef.type = type;
 196         ef.name = name;
 197         ef.namel = strlen(name);
 198         ef.ef_el = el;
 199
 200         memset(el, 0, sizeof(struct gfs2_ea_location));
 201
 202         error = ea_foreach(ip, ea_find_i, &ef);
 203         if (error > 0)
 204                 return 0;
 205
 206         return error;
 207 }
 208
 209 /**
 210  * ea_dealloc_unstuffed -
 211  * @ip:
 212  * @bh:
 213  * @ea:
 214  * @prev:
 215  * @private:
 216  *
 217  * Take advantage of the fact that all unstuffed blocks are
 218  * allocated from the same RG.  But watch, this may not always
 219  * be true.
 220  *
 221  * Returns: errno
 222  */
 223
 224 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 225                                 struct gfs2_ea_header *ea,
 226                                 struct gfs2_ea_header *prev, void *private)
 227 {
 228         int *leave = private;
 229         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230         struct gfs2_rgrpd *rgd;
 231         struct gfs2_holder rg_gh;
 232         struct buffer_head *dibh;
 233         __be64 *dataptrs;
 234         u64 bn = 0;
 235         u64 bstart = 0;
 236         unsigned int blen = 0;
 237         unsigned int blks = 0;
 238         unsigned int x;
 239         int error;
 240
 241         if (GFS2_EA_IS_STUFFED(ea))
 242                 return 0;
 243
 244         dataptrs = GFS2_EA2DATAPTRS(ea);
 245         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 246                 if (*dataptrs) {
 247                         blks++;
 248                         bn = be64_to_cpu(*dataptrs);
 249                 }
 250         }
 251         if (!blks)
 252                 return 0;
 253
 254         rgd = gfs2_blk2rgrpd(sdp, bn);
 255         if (!rgd) {
 256                 gfs2_consist_inode(ip);
 257                 return -EIO;
 258         }
 259
 260         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 261         if (error)
 262                 return error;
 263
 264         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 265                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 266         if (error)
 267                 goto out_gunlock;
 268
 269         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 270
 271         dataptrs = GFS2_EA2DATAPTRS(ea);
 272         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 273                 if (!*dataptrs)
 274                         break;
 275                 bn = be64_to_cpu(*dataptrs);
 276
 277                 if (bstart + blen == bn)
 278                         blen++;
 279                 else {
 280                         if (bstart)
 281                                 gfs2_free_meta(ip, bstart, blen);
 282                         bstart = bn;
 283                         blen = 1;
 284                 }
 285
 286                 *dataptrs = 0;
 287                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 288         }
 289         if (bstart)
 290                 gfs2_free_meta(ip, bstart, blen);
 291
 292         if (prev && !leave) {
 293                 u32 len;
 294
 295                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 296                 prev->ea_rec_len = cpu_to_be32(len);
 297
 298                 if (GFS2_EA_IS_LAST(ea))
 299                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 300         } else {
 301                 ea->ea_type = GFS2_EATYPE_UNUSED;
 302                 ea->ea_num_ptrs = 0;
 303         }
 304
 305         error = gfs2_meta_inode_buffer(ip, &dibh);
 306         if (!error) {
 307                 ip->i_inode.i_ctime = CURRENT_TIME;
 308                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 309                 gfs2_dinode_out(ip, dibh->b_data);
 310                 brelse(dibh);
 311         }
 312
 313         gfs2_trans_end(sdp);
 314
 315 out_gunlock:
 316         gfs2_glock_dq_uninit(&rg_gh);
 317         return error;
 318 }
 319
 320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 321                                struct gfs2_ea_header *ea,
 322                                struct gfs2_ea_header *prev, int leave)
 323 {
 324         struct gfs2_alloc *al;
 325         int error;
 326
 327         al = gfs2_alloc_get(ip);
 328         if (!al)
 329                 return -ENOMEM;
 330
 331         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 332         if (error)
 333                 goto out_alloc;
 334
 335         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 336         if (error)
 337                 goto out_quota;
 338
 339         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341         gfs2_glock_dq_uninit(&al->al_ri_gh);
 342
 343 out_quota:
 344         gfs2_quota_unhold(ip);
 345 out_alloc:
 346         gfs2_alloc_put(ip);
 347         return error;
 348 }
 349
 350 struct ea_list {
 351         struct gfs2_ea_request *ei_er;
 352         unsigned int ei_size;
 353 };
 354
 355 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 356 {
 357         switch (ea->ea_type) {
 358         case GFS2_EATYPE_USR:
 359                 return 5 + ea->ea_name_len + 1;
 360         case GFS2_EATYPE_SYS:
 361                 return 7 + ea->ea_name_len + 1;
 362         case GFS2_EATYPE_SECURITY:
 363                 return 9 + ea->ea_name_len + 1;
 364         default:
 365                 return 0;
 366         }
 367 }
 368
 369 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 370                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 371                      void *private)
 372 {
 373         struct ea_list *ei = private;
 374         struct gfs2_ea_request *er = ei->ei_er;
 375         unsigned int ea_size = gfs2_ea_strlen(ea);
 376
 377         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 378                 return 0;
 379
 380         if (er->er_data_len) {
 381                 char *prefix = NULL;
 382                 unsigned int l = 0;
 383                 char c = 0;
 384
 385                 if (ei->ei_size + ea_size > er->er_data_len)
 386                         return -ERANGE;
 387
 388                 switch (ea->ea_type) {
 389                 case GFS2_EATYPE_USR:
 390                         prefix = "user.";
 391                         l = 5;
 392                         break;
 393                 case GFS2_EATYPE_SYS:
 394                         prefix = "system.";
 395                         l = 7;
 396                         break;
 397                 case GFS2_EATYPE_SECURITY:
 398                         prefix = "security.";
 399                         l = 9;
 400                         break;
 401                 }
 402
 403                 BUG_ON(l == 0);
 404
 405                 memcpy(er->er_data + ei->ei_size, prefix, l);
 406                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 407                        ea->ea_name_len);
 408                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 409         }
 410
 411         ei->ei_size += ea_size;
 412
 413         return 0;
 414 }
 415
 416 /**
 417  * gfs2_listxattr - List gfs2 extended attributes
 418  * @dentry: The dentry whose inode we are interested in
 419  * @buffer: The buffer to write the results
 420  * @size: The size of the buffer
 421  *
 422  * Returns: actual size of data on success, -errno on error
 423  */
 424
 425 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 426 {
 427         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 428         struct gfs2_ea_request er;
 429         struct gfs2_holder i_gh;
 430         int error;
 431
 432         memset(&er, 0, sizeof(struct gfs2_ea_request));
 433         if (size) {
 434                 er.er_data = buffer;
 435                 er.er_data_len = size;
 436         }
 437
 438         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 439         if (error)
 440                 return error;
 441
 442         if (ip->i_eattr) {
 443                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 444
 445                 error = ea_foreach(ip, ea_list_i, &ei);
 446                 if (!error)
 447                         error = ei.ei_size;
 448         }
 449
 450         gfs2_glock_dq_uninit(&i_gh);
 451
 452         return error;
 453 }
 454
 455 /**
 456  * ea_get_unstuffed - actually copies the unstuffed data into the
 457  *                    request buffer
 458  * @ip: The GFS2 inode
 459  * @ea: The extended attribute header structure
 460  * @data: The data to be copied
 461  *
 462  * Returns: errno
 463  */
 464
 465 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 466                             char *data)
 467 {
 468         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 469         struct buffer_head **bh;
 470         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 471         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 472         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 473         unsigned int x;
 474         int error = 0;
 475
 476         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 477         if (!bh)
 478                 return -ENOMEM;
 479
 480         for (x = 0; x < nptrs; x++) {
 481                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 482                                        bh + x);
 483                 if (error) {
 484                         while (x--)
 485                                 brelse(bh[x]);
 486                         goto out;
 487                 }
 488                 dataptrs++;
 489         }
 490
 491         for (x = 0; x < nptrs; x++) {
 492                 error = gfs2_meta_wait(sdp, bh[x]);
 493                 if (error) {
 494                         for (; x < nptrs; x++)
 495                                 brelse(bh[x]);
 496                         goto out;
 497                 }
 498                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 499                         for (; x < nptrs; x++)
 500                                 brelse(bh[x]);
 501                         error = -EIO;
 502                         goto out;
 503                 }
 504
 505                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 506                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 507
 508                 amount -= sdp->sd_jbsize;
 509                 data += sdp->sd_jbsize;
 510
 511                 brelse(bh[x]);
 512         }
 513
 514 out:
 515         kfree(bh);
 516         return error;
 517 }
 518
 519 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 520                             char *data, size_t size)
 521 {
 522         int ret;
 523         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 524         if (len > size)
 525                 return -ERANGE;
 526
 527         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 528                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 529                 return len;
 530         }
 531         ret = ea_get_unstuffed(ip, el->el_ea, data);
 532         if (ret < 0)
 533                 return ret;
 534         return len;
 535 }
 536
 537 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 538 {
 539         struct gfs2_ea_location el;
 540         int error;
 541         int len;
 542         char *data;
 543
 544         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 545         if (error)
 546                 return error;
 547         if (!el.el_ea)
 548                 goto out;
 549         if (!GFS2_EA_DATA_LEN(el.el_ea))
 550                 goto out;
 551
 552         len = GFS2_EA_DATA_LEN(el.el_ea);
 553         data = kmalloc(len, GFP_NOFS);
 554         error = -ENOMEM;
 555         if (data == NULL)
 556                 goto out;
 557
 558         error = gfs2_ea_get_copy(ip, &el, data, len);
 559         if (error == 0)
 560                 error = len;
 561         *ppdata = data;
 562 out:
 563         brelse(el.el_bh);
 564         return error;
 565 }
 566
 567 /**
 568  * gfs2_xattr_get - Get a GFS2 extended attribute
 569  * @inode: The inode
 570  * @name: The name of the extended attribute
 571  * @buffer: The buffer to write the result into
 572  * @size: The size of the buffer
 573  * @type: The type of extended attribute
 574  *
 575  * Returns: actual size of data on success, -errno on error
 576  */
 577 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
 578                 void *buffer, size_t size, int type)
 579 {
 580         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 581         struct gfs2_ea_location el;
 582         int error;
 583
 584         if (!ip->i_eattr)
 585                 return -ENODATA;
 586         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 587                 return -EINVAL;
 588
 589         error = gfs2_ea_find(ip, type, name, &el);
 590         if (error)
 591                 return error;
 592         if (!el.el_ea)
 593                 return -ENODATA;
 594         if (size)
 595                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 596         else
 597                 error = GFS2_EA_DATA_LEN(el.el_ea);
 598         brelse(el.el_bh);
 599
 600         return error;
 601 }
 602
 603 /**
 604  * ea_alloc_blk - allocates a new block for extended attributes.
 605  * @ip: A pointer to the inode that's getting extended attributes
 606  * @bhp: Pointer to pointer to a struct buffer_head
 607  *
 608  * Returns: errno
 609  */
 610
 611 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 612 {
 613         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 614         struct gfs2_ea_header *ea;
 615         unsigned int n = 1;
 616         u64 block;
 617         int error;
 618
 619         error = gfs2_alloc_block(ip, &block, &n);
 620         if (error)
 621                 return error;
 622         gfs2_trans_add_unrevoke(sdp, block, 1);
 623         *bhp = gfs2_meta_new(ip->i_gl, block);
 624         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 625         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 626         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 627
 628         ea = GFS2_EA_BH2FIRST(*bhp);
 629         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 630         ea->ea_type = GFS2_EATYPE_UNUSED;
 631         ea->ea_flags = GFS2_EAFLAG_LAST;
 632         ea->ea_num_ptrs = 0;
 633
 634         gfs2_add_inode_blocks(&ip->i_inode, 1);
 635
 636         return 0;
 637 }
 638
 639 /**
 640  * ea_write - writes the request info to an ea, creating new blocks if
 641  *            necessary
 642  * @ip: inode that is being modified
 643  * @ea: the location of the new ea in a block
 644  * @er: the write request
 645  *
 646  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 647  *
 648  * returns : errno
 649  */
 650
 651 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 652                     struct gfs2_ea_request *er)
 653 {
 654         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 655         int error;
 656
 657         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 658         ea->ea_name_len = er->er_name_len;
 659         ea->ea_type = er->er_type;
 660         ea->__pad = 0;
 661
 662         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 663
 664         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 665                 ea->ea_num_ptrs = 0;
 666                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 667         } else {
 668                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 669                 const char *data = er->er_data;
 670                 unsigned int data_len = er->er_data_len;
 671                 unsigned int copy;
 672                 unsigned int x;
 673
 674                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 675                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 676                         struct buffer_head *bh;
 677                         u64 block;
 678                         int mh_size = sizeof(struct gfs2_meta_header);
 679                         unsigned int n = 1;
 680
 681                         error = gfs2_alloc_block(ip, &block, &n);
 682                         if (error)
 683                                 return error;
 684                         gfs2_trans_add_unrevoke(sdp, block, 1);
 685                         bh = gfs2_meta_new(ip->i_gl, block);
 686                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 687                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 688
 689                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 690
 691                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 692                                                            data_len;
 693                         memcpy(bh->b_data + mh_size, data, copy);
 694                         if (copy < sdp->sd_jbsize)
 695                                 memset(bh->b_data + mh_size + copy, 0,
 696                                        sdp->sd_jbsize - copy);
 697
 698                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 699                         data += copy;
 700                         data_len -= copy;
 701
 702                         brelse(bh);
 703                 }
 704
 705                 gfs2_assert_withdraw(sdp, !data_len);
 706         }
 707
 708         return 0;
 709 }
 710
 711 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 712                                    struct gfs2_ea_request *er, void *private);
 713
 714 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 715                              unsigned int blks,
 716                              ea_skeleton_call_t skeleton_call, void *private)
 717 {
 718         struct gfs2_alloc *al;
 719         struct buffer_head *dibh;
 720         int error;
 721
 722         al = gfs2_alloc_get(ip);
 723         if (!al)
 724                 return -ENOMEM;
 725
 726         error = gfs2_quota_lock_check(ip);
 727         if (error)
 728                 goto out;
 729
 730         al->al_requested = blks;
 731
 732         error = gfs2_inplace_reserve(ip);
 733         if (error)
 734                 goto out_gunlock_q;
 735
 736         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 737                                  blks + gfs2_rg_blocks(al) +
 738                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 739         if (error)
 740                 goto out_ipres;
 741
 742         error = skeleton_call(ip, er, private);
 743         if (error)
 744                 goto out_end_trans;
 745
 746         error = gfs2_meta_inode_buffer(ip, &dibh);
 747         if (!error) {
 748                 ip->i_inode.i_ctime = CURRENT_TIME;
 749                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 750                 gfs2_dinode_out(ip, dibh->b_data);
 751                 brelse(dibh);
 752         }
 753
 754 out_end_trans:
 755         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 756 out_ipres:
 757         gfs2_inplace_release(ip);
 758 out_gunlock_q:
 759         gfs2_quota_unlock(ip);
 760 out:
 761         gfs2_alloc_put(ip);
 762         return error;
 763 }
 764
 765 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 766                      void *private)
 767 {
 768         struct buffer_head *bh;
 769         int error;
 770
 771         error = ea_alloc_blk(ip, &bh);
 772         if (error)
 773                 return error;
 774
 775         ip->i_eattr = bh->b_blocknr;
 776         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 777
 778         brelse(bh);
 779
 780         return error;
 781 }
 782
 783 /**
 784  * ea_init - initializes a new eattr block
 785  * @ip:
 786  * @er:
 787  *
 788  * Returns: errno
 789  */
 790
 791 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 792                    const void *data, size_t size)
 793 {
 794         struct gfs2_ea_request er;
 795         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 796         unsigned int blks = 1;
 797
 798         er.er_type = type;
 799         er.er_name = name;
 800         er.er_name_len = strlen(name);
 801         er.er_data = (void *)data;
 802         er.er_data_len = size;
 803
 804         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 805                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 806
 807         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 808 }
 809
 810 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 811 {
 812         u32 ea_size = GFS2_EA_SIZE(ea);
 813         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 814                                      ea_size);
 815         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 816         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 817
 818         ea->ea_rec_len = cpu_to_be32(ea_size);
 819         ea->ea_flags ^= last;
 820
 821         new->ea_rec_len = cpu_to_be32(new_size);
 822         new->ea_flags = last;
 823
 824         return new;
 825 }
 826
 827 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 828                                   struct gfs2_ea_location *el)
 829 {
 830         struct gfs2_ea_header *ea = el->el_ea;
 831         struct gfs2_ea_header *prev = el->el_prev;
 832         u32 len;
 833
 834         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 835
 836         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 837                 ea->ea_type = GFS2_EATYPE_UNUSED;
 838                 return;
 839         } else if (GFS2_EA2NEXT(prev) != ea) {
 840                 prev = GFS2_EA2NEXT(prev);
 841                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 842         }
 843
 844         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 845         prev->ea_rec_len = cpu_to_be32(len);
 846
 847         if (GFS2_EA_IS_LAST(ea))
 848                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 849 }
 850
 851 struct ea_set {
 852         int ea_split;
 853
 854         struct gfs2_ea_request *es_er;
 855         struct gfs2_ea_location *es_el;
 856
 857         struct buffer_head *es_bh;
 858         struct gfs2_ea_header *es_ea;
 859 };
 860
 861 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 862                                  struct gfs2_ea_header *ea, struct ea_set *es)
 863 {
 864         struct gfs2_ea_request *er = es->es_er;
 865         struct buffer_head *dibh;
 866         int error;
 867
 868         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 869         if (error)
 870                 return error;
 871
 872         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 873
 874         if (es->ea_split)
 875                 ea = ea_split_ea(ea);
 876
 877         ea_write(ip, ea, er);
 878
 879         if (es->es_el)
 880                 ea_set_remove_stuffed(ip, es->es_el);
 881
 882         error = gfs2_meta_inode_buffer(ip, &dibh);
 883         if (error)
 884                 goto out;
 885         ip->i_inode.i_ctime = CURRENT_TIME;
 886         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 887         gfs2_dinode_out(ip, dibh->b_data);
 888         brelse(dibh);
 889 out:
 890         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 891         return error;
 892 }
 893
 894 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 895                                struct gfs2_ea_request *er, void *private)
 896 {
 897         struct ea_set *es = private;
 898         struct gfs2_ea_header *ea = es->es_ea;
 899         int error;
 900
 901         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 902
 903         if (es->ea_split)
 904                 ea = ea_split_ea(ea);
 905
 906         error = ea_write(ip, ea, er);
 907         if (error)
 908                 return error;
 909
 910         if (es->es_el)
 911                 ea_set_remove_stuffed(ip, es->es_el);
 912
 913         return 0;
 914 }
 915
 916 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 917                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 918                          void *private)
 919 {
 920         struct ea_set *es = private;
 921         unsigned int size;
 922         int stuffed;
 923         int error;
 924
 925         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 926                                es->es_er->er_data_len, &size);
 927
 928         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 929                 if (GFS2_EA_REC_LEN(ea) < size)
 930                         return 0;
 931                 if (!GFS2_EA_IS_STUFFED(ea)) {
 932                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 933                         if (error)
 934                                 return error;
 935                 }
 936                 es->ea_split = 0;
 937         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 938                 es->ea_split = 1;
 939         else
 940                 return 0;
 941
 942         if (stuffed) {
 943                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 944                 if (error)
 945                         return error;
 946         } else {
 947                 unsigned int blks;
 948
 949                 es->es_bh = bh;
 950                 es->es_ea = ea;
 951                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 952                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 953
 954                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 955                                           ea_set_simple_alloc, es);
 956                 if (error)
 957                         return error;
 958         }
 959
 960         return 1;
 961 }
 962
 963 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 964                         void *private)
 965 {
 966         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 967         struct buffer_head *indbh, *newbh;
 968         __be64 *eablk;
 969         int error;
 970         int mh_size = sizeof(struct gfs2_meta_header);
 971
 972         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 973                 __be64 *end;
 974
 975                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 976                                        &indbh);
 977                 if (error)
 978                         return error;
 979
 980                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 981                         error = -EIO;
 982                         goto out;
 983                 }
 984
 985                 eablk = (__be64 *)(indbh->b_data + mh_size);
 986                 end = eablk + sdp->sd_inptrs;
 987
 988                 for (; eablk < end; eablk++)
 989                         if (!*eablk)
 990                                 break;
 991
 992                 if (eablk == end) {
 993                         error = -ENOSPC;
 994                         goto out;
 995                 }
 996
 997                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 998         } else {
 999                 u64 blk;
1000                 unsigned int n = 1;
1001                 error = gfs2_alloc_block(ip, &blk, &n);
1002                 if (error)
1003                         return error;
1004                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1005                 indbh = gfs2_meta_new(ip->i_gl, blk);
1006                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1007                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1008                 gfs2_buffer_clear_tail(indbh, mh_size);
1009
1010                 eablk = (__be64 *)(indbh->b_data + mh_size);
1011                 *eablk = cpu_to_be64(ip->i_eattr);
1012                 ip->i_eattr = blk;
1013                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1014                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1015
1016                 eablk++;
1017         }
1018
1019         error = ea_alloc_blk(ip, &newbh);
1020         if (error)
1021                 goto out;
1022
1023         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1024         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1025         brelse(newbh);
1026         if (error)
1027                 goto out;
1028
1029         if (private)
1030                 ea_set_remove_stuffed(ip, private);
1031
1032 out:
1033         brelse(indbh);
1034         return error;
1035 }
1036
1037 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1038                     const void *value, size_t size, struct gfs2_ea_location *el)
1039 {
1040         struct gfs2_ea_request er;
1041         struct ea_set es;
1042         unsigned int blks = 2;
1043         int error;
1044
1045         er.er_type = type;
1046         er.er_name = name;
1047         er.er_data = (void *)value;
1048         er.er_name_len = strlen(name);
1049         er.er_data_len = size;
1050
1051         memset(&es, 0, sizeof(struct ea_set));
1052         es.es_er = &er;
1053         es.es_el = el;
1054
1055         error = ea_foreach(ip, ea_set_simple, &es);
1056         if (error > 0)
1057                 return 0;
1058         if (error)
1059                 return error;
1060
1061         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1062                 blks++;
1063         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1064                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1065
1066         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1067 }
1068
1069 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1070                                    struct gfs2_ea_location *el)
1071 {
1072         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1073                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1074                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1075                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1076         }
1077
1078         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1079 }
1080
1081 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1082 {
1083         struct gfs2_ea_header *ea = el->el_ea;
1084         struct gfs2_ea_header *prev = el->el_prev;
1085         struct buffer_head *dibh;
1086         int error;
1087
1088         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1089         if (error)
1090                 return error;
1091
1092         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1093
1094         if (prev) {
1095                 u32 len;
1096
1097                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1098                 prev->ea_rec_len = cpu_to_be32(len);
1099
1100                 if (GFS2_EA_IS_LAST(ea))
1101                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1102         } else {
1103                 ea->ea_type = GFS2_EATYPE_UNUSED;
1104         }
1105
1106         error = gfs2_meta_inode_buffer(ip, &dibh);
1107         if (!error) {
1108                 ip->i_inode.i_ctime = CURRENT_TIME;
1109                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1110                 gfs2_dinode_out(ip, dibh->b_data);
1111                 brelse(dibh);
1112         }
1113
1114         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1115
1116         return error;
1117 }
1118
1119 /**
1120  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1121  * @ip: The inode
1122  * @type: The type of the extended attribute
1123  * @name: The name of the extended attribute
1124  *
1125  * This is not called directly by the VFS since we use the (common)
1126  * scheme of making a "set with NULL data" mean a remove request. Note
1127  * that this is different from a set with zero length data.
1128  *
1129  * Returns: 0, or errno on failure
1130  */
1131
1132 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1133 {
1134         struct gfs2_ea_location el;
1135         int error;
1136
1137         if (!ip->i_eattr)
1138                 return -ENODATA;
1139
1140         error = gfs2_ea_find(ip, type, name, &el);
1141         if (error)
1142                 return error;
1143         if (!el.el_ea)
1144                 return -ENODATA;
1145
1146         if (GFS2_EA_IS_STUFFED(el.el_ea))
1147                 error = ea_remove_stuffed(ip, &el);
1148         else
1149                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1150
1151         brelse(el.el_bh);
1152
1153         return error;
1154 }
1155
1156 /**
1157  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1158  * @ip: The inode
1159  * @name: The name of the extended attribute
1160  * @value: The value of the extended attribute (NULL for remove)
1161  * @size: The size of the @value argument
1162  * @flags: Create or Replace
1163  * @type: The type of the extended attribute
1164  *
1165  * See gfs2_xattr_remove() for details of the removal of xattrs.
1166  *
1167  * Returns: 0 or errno on failure
1168  */
1169
1170 int __gfs2_xattr_set(struct inode *inode, const char *name,
1171                    const void *value, size_t size, int flags, int type)
1172 {
1173         struct gfs2_inode *ip = GFS2_I(inode);
1174         struct gfs2_sbd *sdp = GFS2_SB(inode);
1175         struct gfs2_ea_location el;
1176         unsigned int namel = strlen(name);
1177         int error;
1178
1179         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1180                 return -EPERM;
1181         if (namel > GFS2_EA_MAX_NAME_LEN)
1182                 return -ERANGE;
1183
1184         if (value == NULL)
1185                 return gfs2_xattr_remove(ip, type, name);
1186
1187         if (ea_check_size(sdp, namel, size))
1188                 return -ERANGE;
1189
1190         if (!ip->i_eattr) {
1191                 if (flags & XATTR_REPLACE)
1192                         return -ENODATA;
1193                 return ea_init(ip, type, name, value, size);
1194         }
1195
1196         error = gfs2_ea_find(ip, type, name, &el);
1197         if (error)
1198                 return error;
1199
1200         if (el.el_ea) {
1201                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1202                         brelse(el.el_bh);
1203                         return -EPERM;
1204                 }
1205
1206                 error = -EEXIST;
1207                 if (!(flags & XATTR_CREATE)) {
1208                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1209                         error = ea_set_i(ip, type, name, value, size, &el);
1210                         if (!error && unstuffed)
1211                                 ea_set_remove_unstuffed(ip, &el);
1212                 }
1213
1214                 brelse(el.el_bh);
1215                 return error;
1216         }
1217
1218         error = -ENODATA;
1219         if (!(flags & XATTR_REPLACE))
1220                 error = ea_set_i(ip, type, name, value, size, NULL);
1221
1222         return error;
1223 }
1224
1225 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1226                 const void *value, size_t size, int flags, int type)
1227 {
1228         return __gfs2_xattr_set(dentry->d_inode, name, value,
1229                                 size, flags, type);
1230 }
1231
1232 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1233                                   struct gfs2_ea_header *ea, char *data)
1234 {
1235         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1236         struct buffer_head **bh;
1237         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1238         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1239         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1240         unsigned int x;
1241         int error;
1242
1243         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1244         if (!bh)
1245                 return -ENOMEM;
1246
1247         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1248         if (error)
1249                 goto out;
1250
1251         for (x = 0; x < nptrs; x++) {
1252                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1253                                        bh + x);
1254                 if (error) {
1255                         while (x--)
1256                                 brelse(bh[x]);
1257                         goto fail;
1258                 }
1259                 dataptrs++;
1260         }
1261
1262         for (x = 0; x < nptrs; x++) {
1263                 error = gfs2_meta_wait(sdp, bh[x]);
1264                 if (error) {
1265                         for (; x < nptrs; x++)
1266                                 brelse(bh[x]);
1267                         goto fail;
1268                 }
1269                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1270                         for (; x < nptrs; x++)
1271                                 brelse(bh[x]);
1272                         error = -EIO;
1273                         goto fail;
1274                 }
1275
1276                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1277
1278                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1279                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1280
1281                 amount -= sdp->sd_jbsize;
1282                 data += sdp->sd_jbsize;
1283
1284                 brelse(bh[x]);
1285         }
1286
1287 out:
1288         kfree(bh);
1289         return error;
1290
1291 fail:
1292         gfs2_trans_end(sdp);
1293         kfree(bh);
1294         return error;
1295 }
1296
1297 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1298 {
1299         struct inode *inode = &ip->i_inode;
1300         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1301         struct gfs2_ea_location el;
1302         struct buffer_head *dibh;
1303         int error;
1304
1305         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1306         if (error)
1307                 return error;
1308
1309         if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1310                 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1311                 if (error == 0) {
1312                         gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1313                         memcpy(GFS2_EA2DATA(el.el_ea), data,
1314                                GFS2_EA_DATA_LEN(el.el_ea));
1315                 }
1316         } else {
1317                 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1318         }
1319
1320         brelse(el.el_bh);
1321         if (error)
1322                 return error;
1323
1324         error = gfs2_meta_inode_buffer(ip, &dibh);
1325         if (error)
1326                 goto out_trans_end;
1327
1328         if ((attr->ia_valid & ATTR_SIZE) &&
1329             attr->ia_size != i_size_read(inode)) {
1330                 int error;
1331
1332                 error = vmtruncate(inode, attr->ia_size);
1333                 gfs2_assert_warn(GFS2_SB(inode), !error);
1334         }
1335
1336         setattr_copy(inode, attr);
1337         mark_inode_dirty(inode);
1338
1339         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1340         gfs2_dinode_out(ip, dibh->b_data);
1341         brelse(dibh);
1342
1343 out_trans_end:
1344         gfs2_trans_end(sdp);
1345         return error;
1346 }
1347
1348 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1349 {
1350         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1351         struct gfs2_rgrp_list rlist;
1352         struct buffer_head *indbh, *dibh;
1353         __be64 *eablk, *end;
1354         unsigned int rg_blocks = 0;
1355         u64 bstart = 0;
1356         unsigned int blen = 0;
1357         unsigned int blks = 0;
1358         unsigned int x;
1359         int error;
1360
1361         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1362
1363         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1364         if (error)
1365                 return error;
1366
1367         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1368                 error = -EIO;
1369                 goto out;
1370         }
1371
1372         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1373         end = eablk + sdp->sd_inptrs;
1374
1375         for (; eablk < end; eablk++) {
1376                 u64 bn;
1377
1378                 if (!*eablk)
1379                         break;
1380                 bn = be64_to_cpu(*eablk);
1381
1382                 if (bstart + blen == bn)
1383                         blen++;
1384                 else {
1385                         if (bstart)
1386                                 gfs2_rlist_add(sdp, &rlist, bstart);
1387                         bstart = bn;
1388                         blen = 1;
1389                 }
1390                 blks++;
1391         }
1392         if (bstart)
1393                 gfs2_rlist_add(sdp, &rlist, bstart);
1394         else
1395                 goto out;
1396
1397         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1398
1399         for (x = 0; x < rlist.rl_rgrps; x++) {
1400                 struct gfs2_rgrpd *rgd;
1401                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1402                 rg_blocks += rgd->rd_length;
1403         }
1404
1405         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1406         if (error)
1407                 goto out_rlist_free;
1408
1409         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1410                                  RES_STATFS + RES_QUOTA, blks);
1411         if (error)
1412                 goto out_gunlock;
1413
1414         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1415
1416         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1417         bstart = 0;
1418         blen = 0;
1419
1420         for (; eablk < end; eablk++) {
1421                 u64 bn;
1422
1423                 if (!*eablk)
1424                         break;
1425                 bn = be64_to_cpu(*eablk);
1426
1427                 if (bstart + blen == bn)
1428                         blen++;
1429                 else {
1430                         if (bstart)
1431                                 gfs2_free_meta(ip, bstart, blen);
1432                         bstart = bn;
1433                         blen = 1;
1434                 }
1435
1436                 *eablk = 0;
1437                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1438         }
1439         if (bstart)
1440                 gfs2_free_meta(ip, bstart, blen);
1441
1442         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1443
1444         error = gfs2_meta_inode_buffer(ip, &dibh);
1445         if (!error) {
1446                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1447                 gfs2_dinode_out(ip, dibh->b_data);
1448                 brelse(dibh);
1449         }
1450
1451         gfs2_trans_end(sdp);
1452
1453 out_gunlock:
1454         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1455 out_rlist_free:
1456         gfs2_rlist_free(&rlist);
1457 out:
1458         brelse(indbh);
1459         return error;
1460 }
1461
1462 static int ea_dealloc_block(struct gfs2_inode *ip)
1463 {
1464         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1465         struct gfs2_alloc *al = ip->i_alloc;
1466         struct gfs2_rgrpd *rgd;
1467         struct buffer_head *dibh;
1468         int error;
1469
1470         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1471         if (!rgd) {
1472                 gfs2_consist_inode(ip);
1473                 return -EIO;
1474         }
1475
1476         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1477                                    &al->al_rgd_gh);
1478         if (error)
1479                 return error;
1480
1481         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1482                                  RES_QUOTA, 1);
1483         if (error)
1484                 goto out_gunlock;
1485
1486         gfs2_free_meta(ip, ip->i_eattr, 1);
1487
1488         ip->i_eattr = 0;
1489         gfs2_add_inode_blocks(&ip->i_inode, -1);
1490
1491         error = gfs2_meta_inode_buffer(ip, &dibh);
1492         if (!error) {
1493                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1494                 gfs2_dinode_out(ip, dibh->b_data);
1495                 brelse(dibh);
1496         }
1497
1498         gfs2_trans_end(sdp);
1499
1500 out_gunlock:
1501         gfs2_glock_dq_uninit(&al->al_rgd_gh);
1502         return error;
1503 }
1504
1505 /**
1506  * gfs2_ea_dealloc - deallocate the extended attribute fork
1507  * @ip: the inode
1508  *
1509  * Returns: errno
1510  */
1511
1512 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1513 {
1514         struct gfs2_alloc *al;
1515         int error;
1516
1517         al = gfs2_alloc_get(ip);
1518         if (!al)
1519                 return -ENOMEM;
1520
1521         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1522         if (error)
1523                 goto out_alloc;
1524
1525         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1526         if (error)
1527                 goto out_quota;
1528
1529         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1530         if (error)
1531                 goto out_rindex;
1532
1533         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1534                 error = ea_dealloc_indirect(ip);
1535                 if (error)
1536                         goto out_rindex;
1537         }
1538
1539         error = ea_dealloc_block(ip);
1540
1541 out_rindex:
1542         gfs2_glock_dq_uninit(&al->al_ri_gh);
1543 out_quota:
1544         gfs2_quota_unhold(ip);
1545 out_alloc:
1546         gfs2_alloc_put(ip);
1547         return error;
1548 }
1549
1550 static const struct xattr_handler gfs2_xattr_user_handler = {
1551         .prefix = XATTR_USER_PREFIX,
1552         .flags  = GFS2_EATYPE_USR,
1553         .get    = gfs2_xattr_get,
1554         .set    = gfs2_xattr_set,
1555 };
1556
1557 static const struct xattr_handler gfs2_xattr_security_handler = {
1558         .prefix = XATTR_SECURITY_PREFIX,
1559         .flags  = GFS2_EATYPE_SECURITY,
1560         .get    = gfs2_xattr_get,
1561         .set    = gfs2_xattr_set,
1562 };
1563
1564 const struct xattr_handler *gfs2_xattr_handlers[] = {
1565         &gfs2_xattr_user_handler,
1566         &gfs2_xattr_security_handler,
1567         &gfs2_xattr_system_handler,
1568         NULL,
1569 };
1570