fs/gfs2/xattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/posix_acl_xattr.h>
  17 #include <linux/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "acl.h"
  22 #include "xattr.h"
  23 #include "glock.h"
  24 #include "inode.h"
  25 #include "meta_io.h"
  26 #include "quota.h"
  27 #include "rgrp.h"
  28 #include "super.h"
  29 #include "trans.h"
  30 #include "util.h"
  31
  32 /**
  33  * ea_calc_size - returns the acutal number of bytes the request will take up
  34  *                (not counting any unstuffed data blocks)
  35  * @sdp:
  36  * @er:
  37  * @size:
  38  *
  39  * Returns: 1 if the EA should be stuffed
  40  */
  41
  42 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  43                         unsigned int *size)
  44 {
  45         unsigned int jbsize = sdp->sd_jbsize;
  46
  47         /* Stuffed */
  48         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  49
  50         if (*size <= jbsize)
  51                 return 1;
  52
  53         /* Unstuffed */
  54         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  55                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  56
  57         return 0;
  58 }
  59
  60 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  61 {
  62         unsigned int size;
  63
  64         if (dsize > GFS2_EA_MAX_DATA_LEN)
  65                 return -ERANGE;
  66
  67         ea_calc_size(sdp, nsize, dsize, &size);
  68
  69         /* This can only happen with 512 byte blocks */
  70         if (size > sdp->sd_jbsize)
  71                 return -ERANGE;
  72
  73         return 0;
  74 }
  75
  76 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  77                           struct gfs2_ea_header *ea,
  78                           struct gfs2_ea_header *prev, void *private);
  79
  80 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  81                         ea_call_t ea_call, void *data)
  82 {
  83         struct gfs2_ea_header *ea, *prev = NULL;
  84         int error = 0;
  85
  86         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  87                 return -EIO;
  88
  89         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  90                 if (!GFS2_EA_REC_LEN(ea))
  91                         goto fail;
  92                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  93                                                   bh->b_data + bh->b_size))
  94                         goto fail;
  95                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  96                         goto fail;
  97
  98                 error = ea_call(ip, bh, ea, prev, data);
  99                 if (error)
 100                         return error;
 101
 102                 if (GFS2_EA_IS_LAST(ea)) {
 103                         if ((char *)GFS2_EA2NEXT(ea) !=
 104                             bh->b_data + bh->b_size)
 105                                 goto fail;
 106                         break;
 107                 }
 108         }
 109
 110         return error;
 111
 112 fail:
 113         gfs2_consist_inode(ip);
 114         return -EIO;
 115 }
 116
 117 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 118 {
 119         struct buffer_head *bh, *eabh;
 120         __be64 *eablk, *end;
 121         int error;
 122
 123         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
 124         if (error)
 125                 return error;
 126
 127         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 128                 error = ea_foreach_i(ip, bh, ea_call, data);
 129                 goto out;
 130         }
 131
 132         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 133                 error = -EIO;
 134                 goto out;
 135         }
 136
 137         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 138         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 139
 140         for (; eablk < end; eablk++) {
 141                 u64 bn;
 142
 143                 if (!*eablk)
 144                         break;
 145                 bn = be64_to_cpu(*eablk);
 146
 147                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
 148                 if (error)
 149                         break;
 150                 error = ea_foreach_i(ip, eabh, ea_call, data);
 151                 brelse(eabh);
 152                 if (error)
 153                         break;
 154         }
 155 out:
 156         brelse(bh);
 157         return error;
 158 }
 159
 160 struct ea_find {
 161         int type;
 162         const char *name;
 163         size_t namel;
 164         struct gfs2_ea_location *ef_el;
 165 };
 166
 167 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 168                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 169                      void *private)
 170 {
 171         struct ea_find *ef = private;
 172
 173         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 174                 return 0;
 175
 176         if (ea->ea_type == ef->type) {
 177                 if (ea->ea_name_len == ef->namel &&
 178                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 179                         struct gfs2_ea_location *el = ef->ef_el;
 180                         get_bh(bh);
 181                         el->el_bh = bh;
 182                         el->el_ea = ea;
 183                         el->el_prev = prev;
 184                         return 1;
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 192                         struct gfs2_ea_location *el)
 193 {
 194         struct ea_find ef;
 195         int error;
 196
 197         ef.type = type;
 198         ef.name = name;
 199         ef.namel = strlen(name);
 200         ef.ef_el = el;
 201
 202         memset(el, 0, sizeof(struct gfs2_ea_location));
 203
 204         error = ea_foreach(ip, ea_find_i, &ef);
 205         if (error > 0)
 206                 return 0;
 207
 208         return error;
 209 }
 210
 211 /**
 212  * ea_dealloc_unstuffed -
 213  * @ip:
 214  * @bh:
 215  * @ea:
 216  * @prev:
 217  * @private:
 218  *
 219  * Take advantage of the fact that all unstuffed blocks are
 220  * allocated from the same RG.  But watch, this may not always
 221  * be true.
 222  *
 223  * Returns: errno
 224  */
 225
 226 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 227                                 struct gfs2_ea_header *ea,
 228                                 struct gfs2_ea_header *prev, void *private)
 229 {
 230         int *leave = private;
 231         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 232         struct gfs2_rgrpd *rgd;
 233         struct gfs2_holder rg_gh;
 234         struct buffer_head *dibh;
 235         __be64 *dataptrs;
 236         u64 bn = 0;
 237         u64 bstart = 0;
 238         unsigned int blen = 0;
 239         unsigned int blks = 0;
 240         unsigned int x;
 241         int error;
 242
 243         error = gfs2_rindex_update(sdp);
 244         if (error)
 245                 return error;
 246
 247         if (GFS2_EA_IS_STUFFED(ea))
 248                 return 0;
 249
 250         dataptrs = GFS2_EA2DATAPTRS(ea);
 251         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 252                 if (*dataptrs) {
 253                         blks++;
 254                         bn = be64_to_cpu(*dataptrs);
 255                 }
 256         }
 257         if (!blks)
 258                 return 0;
 259
 260         rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 261         if (!rgd) {
 262                 gfs2_consist_inode(ip);
 263                 return -EIO;
 264         }
 265
 266         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 267         if (error)
 268                 return error;
 269
 270         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 271                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 272         if (error)
 273                 goto out_gunlock;
 274
 275         gfs2_trans_add_meta(ip->i_gl, bh);
 276
 277         dataptrs = GFS2_EA2DATAPTRS(ea);
 278         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 279                 if (!*dataptrs)
 280                         break;
 281                 bn = be64_to_cpu(*dataptrs);
 282
 283                 if (bstart + blen == bn)
 284                         blen++;
 285                 else {
 286                         if (bstart)
 287                                 gfs2_free_meta(ip, bstart, blen);
 288                         bstart = bn;
 289                         blen = 1;
 290                 }
 291
 292                 *dataptrs = 0;
 293                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 294         }
 295         if (bstart)
 296                 gfs2_free_meta(ip, bstart, blen);
 297
 298         if (prev && !leave) {
 299                 u32 len;
 300
 301                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 302                 prev->ea_rec_len = cpu_to_be32(len);
 303
 304                 if (GFS2_EA_IS_LAST(ea))
 305                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 306         } else {
 307                 ea->ea_type = GFS2_EATYPE_UNUSED;
 308                 ea->ea_num_ptrs = 0;
 309         }
 310
 311         error = gfs2_meta_inode_buffer(ip, &dibh);
 312         if (!error) {
 313                 ip->i_inode.i_ctime = current_time(&ip->i_inode);
 314                 gfs2_trans_add_meta(ip->i_gl, dibh);
 315                 gfs2_dinode_out(ip, dibh->b_data);
 316                 brelse(dibh);
 317         }
 318
 319         gfs2_trans_end(sdp);
 320
 321 out_gunlock:
 322         gfs2_glock_dq_uninit(&rg_gh);
 323         return error;
 324 }
 325
 326 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 327                                struct gfs2_ea_header *ea,
 328                                struct gfs2_ea_header *prev, int leave)
 329 {
 330         int error;
 331
 332         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 333         if (error)
 334                 return error;
 335
 336         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 337         if (error)
 338                 goto out_alloc;
 339
 340         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 341
 342         gfs2_quota_unhold(ip);
 343 out_alloc:
 344         return error;
 345 }
 346
 347 struct ea_list {
 348         struct gfs2_ea_request *ei_er;
 349         unsigned int ei_size;
 350 };
 351
 352 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 353 {
 354         switch (ea->ea_type) {
 355         case GFS2_EATYPE_USR:
 356                 return 5 + ea->ea_name_len + 1;
 357         case GFS2_EATYPE_SYS:
 358                 return 7 + ea->ea_name_len + 1;
 359         case GFS2_EATYPE_SECURITY:
 360                 return 9 + ea->ea_name_len + 1;
 361         default:
 362                 return 0;
 363         }
 364 }
 365
 366 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 367                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 368                      void *private)
 369 {
 370         struct ea_list *ei = private;
 371         struct gfs2_ea_request *er = ei->ei_er;
 372         unsigned int ea_size = gfs2_ea_strlen(ea);
 373
 374         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 375                 return 0;
 376
 377         if (er->er_data_len) {
 378                 char *prefix = NULL;
 379                 unsigned int l = 0;
 380                 char c = 0;
 381
 382                 if (ei->ei_size + ea_size > er->er_data_len)
 383                         return -ERANGE;
 384
 385                 switch (ea->ea_type) {
 386                 case GFS2_EATYPE_USR:
 387                         prefix = "user.";
 388                         l = 5;
 389                         break;
 390                 case GFS2_EATYPE_SYS:
 391                         prefix = "system.";
 392                         l = 7;
 393                         break;
 394                 case GFS2_EATYPE_SECURITY:
 395                         prefix = "security.";
 396                         l = 9;
 397                         break;
 398                 }
 399
 400                 BUG_ON(l == 0);
 401
 402                 memcpy(er->er_data + ei->ei_size, prefix, l);
 403                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 404                        ea->ea_name_len);
 405                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 406         }
 407
 408         ei->ei_size += ea_size;
 409
 410         return 0;
 411 }
 412
 413 /**
 414  * gfs2_listxattr - List gfs2 extended attributes
 415  * @dentry: The dentry whose inode we are interested in
 416  * @buffer: The buffer to write the results
 417  * @size: The size of the buffer
 418  *
 419  * Returns: actual size of data on success, -errno on error
 420  */
 421
 422 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 423 {
 424         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 425         struct gfs2_ea_request er;
 426         struct gfs2_holder i_gh;
 427         int error;
 428
 429         memset(&er, 0, sizeof(struct gfs2_ea_request));
 430         if (size) {
 431                 er.er_data = buffer;
 432                 er.er_data_len = size;
 433         }
 434
 435         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 436         if (error)
 437                 return error;
 438
 439         if (ip->i_eattr) {
 440                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 441
 442                 error = ea_foreach(ip, ea_list_i, &ei);
 443                 if (!error)
 444                         error = ei.ei_size;
 445         }
 446
 447         gfs2_glock_dq_uninit(&i_gh);
 448
 449         return error;
 450 }
 451
 452 /**
 453  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 454  *                     request buffer
 455  * @ip: The GFS2 inode
 456  * @ea: The extended attribute header structure
 457  * @din: The data to be copied in
 458  * @dout: The data to be copied out (one of din,dout will be NULL)
 459  *
 460  * Returns: errno
 461  */
 462
 463 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 464                                const char *din, char *dout)
 465 {
 466         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 467         struct buffer_head **bh;
 468         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 469         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 470         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 471         unsigned int x;
 472         int error = 0;
 473         unsigned char *pos;
 474         unsigned cp_size;
 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, 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                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 506                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 507
 508                 if (dout) {
 509                         memcpy(dout, pos, cp_size);
 510                         dout += sdp->sd_jbsize;
 511                 }
 512
 513                 if (din) {
 514                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 515                         memcpy(pos, din, cp_size);
 516                         din += sdp->sd_jbsize;
 517                 }
 518
 519                 amount -= sdp->sd_jbsize;
 520                 brelse(bh[x]);
 521         }
 522
 523 out:
 524         kfree(bh);
 525         return error;
 526 }
 527
 528 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 529                             char *data, size_t size)
 530 {
 531         int ret;
 532         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 533         if (len > size)
 534                 return -ERANGE;
 535
 536         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 537                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 538                 return len;
 539         }
 540         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 541         if (ret < 0)
 542                 return ret;
 543         return len;
 544 }
 545
 546 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 547 {
 548         struct gfs2_ea_location el;
 549         int error;
 550         int len;
 551         char *data;
 552
 553         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 554         if (error)
 555                 return error;
 556         if (!el.el_ea)
 557                 goto out;
 558         if (!GFS2_EA_DATA_LEN(el.el_ea))
 559                 goto out;
 560
 561         len = GFS2_EA_DATA_LEN(el.el_ea);
 562         data = kmalloc(len, GFP_NOFS);
 563         error = -ENOMEM;
 564         if (data == NULL)
 565                 goto out;
 566
 567         error = gfs2_ea_get_copy(ip, &el, data, len);
 568         if (error < 0)
 569                 kfree(data);
 570         else
 571                 *ppdata = data;
 572 out:
 573         brelse(el.el_bh);
 574         return error;
 575 }
 576
 577 /**
 578  * gfs2_xattr_get - Get a GFS2 extended attribute
 579  * @inode: The inode
 580  * @name: The name of the extended attribute
 581  * @buffer: The buffer to write the result into
 582  * @size: The size of the buffer
 583  * @type: The type of extended attribute
 584  *
 585  * Returns: actual size of data on success, -errno on error
 586  */
 587 static int __gfs2_xattr_get(struct inode *inode, const char *name,
 588                             void *buffer, size_t size, int type)
 589 {
 590         struct gfs2_inode *ip = GFS2_I(inode);
 591         struct gfs2_ea_location el;
 592         int error;
 593
 594         if (!ip->i_eattr)
 595                 return -ENODATA;
 596         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 597                 return -EINVAL;
 598
 599         error = gfs2_ea_find(ip, type, name, &el);
 600         if (error)
 601                 return error;
 602         if (!el.el_ea)
 603                 return -ENODATA;
 604         if (size)
 605                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 606         else
 607                 error = GFS2_EA_DATA_LEN(el.el_ea);
 608         brelse(el.el_bh);
 609
 610         return error;
 611 }
 612
 613 static int gfs2_xattr_get(const struct xattr_handler *handler,
 614                           struct dentry *unused, struct inode *inode,
 615                           const char *name, void *buffer, size_t size)
 616 {
 617         struct gfs2_inode *ip = GFS2_I(inode);
 618         struct gfs2_holder gh;
 619         bool need_unlock = false;
 620         int ret;
 621
 622         /* During lookup, SELinux calls this function with the glock locked. */
 623
 624         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 625                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 626                 if (ret)
 627                         return ret;
 628                 need_unlock = true;
 629         }
 630         ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
 631         if (need_unlock)
 632                 gfs2_glock_dq_uninit(&gh);
 633         return ret;
 634 }
 635
 636 /**
 637  * ea_alloc_blk - allocates a new block for extended attributes.
 638  * @ip: A pointer to the inode that's getting extended attributes
 639  * @bhp: Pointer to pointer to a struct buffer_head
 640  *
 641  * Returns: errno
 642  */
 643
 644 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 645 {
 646         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 647         struct gfs2_ea_header *ea;
 648         unsigned int n = 1;
 649         u64 block;
 650         int error;
 651
 652         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 653         if (error)
 654                 return error;
 655         gfs2_trans_add_unrevoke(sdp, block, 1);
 656         *bhp = gfs2_meta_new(ip->i_gl, block);
 657         gfs2_trans_add_meta(ip->i_gl, *bhp);
 658         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 659         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 660
 661         ea = GFS2_EA_BH2FIRST(*bhp);
 662         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 663         ea->ea_type = GFS2_EATYPE_UNUSED;
 664         ea->ea_flags = GFS2_EAFLAG_LAST;
 665         ea->ea_num_ptrs = 0;
 666
 667         gfs2_add_inode_blocks(&ip->i_inode, 1);
 668
 669         return 0;
 670 }
 671
 672 /**
 673  * ea_write - writes the request info to an ea, creating new blocks if
 674  *            necessary
 675  * @ip: inode that is being modified
 676  * @ea: the location of the new ea in a block
 677  * @er: the write request
 678  *
 679  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 680  *
 681  * returns : errno
 682  */
 683
 684 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 685                     struct gfs2_ea_request *er)
 686 {
 687         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 688         int error;
 689
 690         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 691         ea->ea_name_len = er->er_name_len;
 692         ea->ea_type = er->er_type;
 693         ea->__pad = 0;
 694
 695         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 696
 697         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 698                 ea->ea_num_ptrs = 0;
 699                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 700         } else {
 701                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 702                 const char *data = er->er_data;
 703                 unsigned int data_len = er->er_data_len;
 704                 unsigned int copy;
 705                 unsigned int x;
 706
 707                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 708                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 709                         struct buffer_head *bh;
 710                         u64 block;
 711                         int mh_size = sizeof(struct gfs2_meta_header);
 712                         unsigned int n = 1;
 713
 714                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 715                         if (error)
 716                                 return error;
 717                         gfs2_trans_add_unrevoke(sdp, block, 1);
 718                         bh = gfs2_meta_new(ip->i_gl, block);
 719                         gfs2_trans_add_meta(ip->i_gl, bh);
 720                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 721
 722                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 723
 724                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 725                                                            data_len;
 726                         memcpy(bh->b_data + mh_size, data, copy);
 727                         if (copy < sdp->sd_jbsize)
 728                                 memset(bh->b_data + mh_size + copy, 0,
 729                                        sdp->sd_jbsize - copy);
 730
 731                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 732                         data += copy;
 733                         data_len -= copy;
 734
 735                         brelse(bh);
 736                 }
 737
 738                 gfs2_assert_withdraw(sdp, !data_len);
 739         }
 740
 741         return 0;
 742 }
 743
 744 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 745                                    struct gfs2_ea_request *er, void *private);
 746
 747 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 748                              unsigned int blks,
 749                              ea_skeleton_call_t skeleton_call, void *private)
 750 {
 751         struct gfs2_alloc_parms ap = { .target = blks };
 752         struct buffer_head *dibh;
 753         int error;
 754
 755         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 756         if (error)
 757                 return error;
 758
 759         error = gfs2_quota_lock_check(ip, &ap);
 760         if (error)
 761                 return error;
 762
 763         error = gfs2_inplace_reserve(ip, &ap);
 764         if (error)
 765                 goto out_gunlock_q;
 766
 767         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 768                                  blks + gfs2_rg_blocks(ip, blks) +
 769                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 770         if (error)
 771                 goto out_ipres;
 772
 773         error = skeleton_call(ip, er, private);
 774         if (error)
 775                 goto out_end_trans;
 776
 777         error = gfs2_meta_inode_buffer(ip, &dibh);
 778         if (!error) {
 779                 ip->i_inode.i_ctime = current_time(&ip->i_inode);
 780                 gfs2_trans_add_meta(ip->i_gl, dibh);
 781                 gfs2_dinode_out(ip, dibh->b_data);
 782                 brelse(dibh);
 783         }
 784
 785 out_end_trans:
 786         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 787 out_ipres:
 788         gfs2_inplace_release(ip);
 789 out_gunlock_q:
 790         gfs2_quota_unlock(ip);
 791         return error;
 792 }
 793
 794 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 795                      void *private)
 796 {
 797         struct buffer_head *bh;
 798         int error;
 799
 800         error = ea_alloc_blk(ip, &bh);
 801         if (error)
 802                 return error;
 803
 804         ip->i_eattr = bh->b_blocknr;
 805         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 806
 807         brelse(bh);
 808
 809         return error;
 810 }
 811
 812 /**
 813  * ea_init - initializes a new eattr block
 814  * @ip:
 815  * @er:
 816  *
 817  * Returns: errno
 818  */
 819
 820 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 821                    const void *data, size_t size)
 822 {
 823         struct gfs2_ea_request er;
 824         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 825         unsigned int blks = 1;
 826
 827         er.er_type = type;
 828         er.er_name = name;
 829         er.er_name_len = strlen(name);
 830         er.er_data = (void *)data;
 831         er.er_data_len = size;
 832
 833         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 834                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 835
 836         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 837 }
 838
 839 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 840 {
 841         u32 ea_size = GFS2_EA_SIZE(ea);
 842         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 843                                      ea_size);
 844         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 845         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 846
 847         ea->ea_rec_len = cpu_to_be32(ea_size);
 848         ea->ea_flags ^= last;
 849
 850         new->ea_rec_len = cpu_to_be32(new_size);
 851         new->ea_flags = last;
 852
 853         return new;
 854 }
 855
 856 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 857                                   struct gfs2_ea_location *el)
 858 {
 859         struct gfs2_ea_header *ea = el->el_ea;
 860         struct gfs2_ea_header *prev = el->el_prev;
 861         u32 len;
 862
 863         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 864
 865         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 866                 ea->ea_type = GFS2_EATYPE_UNUSED;
 867                 return;
 868         } else if (GFS2_EA2NEXT(prev) != ea) {
 869                 prev = GFS2_EA2NEXT(prev);
 870                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 871         }
 872
 873         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 874         prev->ea_rec_len = cpu_to_be32(len);
 875
 876         if (GFS2_EA_IS_LAST(ea))
 877                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 878 }
 879
 880 struct ea_set {
 881         int ea_split;
 882
 883         struct gfs2_ea_request *es_er;
 884         struct gfs2_ea_location *es_el;
 885
 886         struct buffer_head *es_bh;
 887         struct gfs2_ea_header *es_ea;
 888 };
 889
 890 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 891                                  struct gfs2_ea_header *ea, struct ea_set *es)
 892 {
 893         struct gfs2_ea_request *er = es->es_er;
 894         struct buffer_head *dibh;
 895         int error;
 896
 897         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 898         if (error)
 899                 return error;
 900
 901         gfs2_trans_add_meta(ip->i_gl, bh);
 902
 903         if (es->ea_split)
 904                 ea = ea_split_ea(ea);
 905
 906         ea_write(ip, ea, er);
 907
 908         if (es->es_el)
 909                 ea_set_remove_stuffed(ip, es->es_el);
 910
 911         error = gfs2_meta_inode_buffer(ip, &dibh);
 912         if (error)
 913                 goto out;
 914         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 915         gfs2_trans_add_meta(ip->i_gl, dibh);
 916         gfs2_dinode_out(ip, dibh->b_data);
 917         brelse(dibh);
 918 out:
 919         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 920         return error;
 921 }
 922
 923 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 924                                struct gfs2_ea_request *er, void *private)
 925 {
 926         struct ea_set *es = private;
 927         struct gfs2_ea_header *ea = es->es_ea;
 928         int error;
 929
 930         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 931
 932         if (es->ea_split)
 933                 ea = ea_split_ea(ea);
 934
 935         error = ea_write(ip, ea, er);
 936         if (error)
 937                 return error;
 938
 939         if (es->es_el)
 940                 ea_set_remove_stuffed(ip, es->es_el);
 941
 942         return 0;
 943 }
 944
 945 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 946                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 947                          void *private)
 948 {
 949         struct ea_set *es = private;
 950         unsigned int size;
 951         int stuffed;
 952         int error;
 953
 954         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 955                                es->es_er->er_data_len, &size);
 956
 957         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 958                 if (GFS2_EA_REC_LEN(ea) < size)
 959                         return 0;
 960                 if (!GFS2_EA_IS_STUFFED(ea)) {
 961                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 962                         if (error)
 963                                 return error;
 964                 }
 965                 es->ea_split = 0;
 966         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 967                 es->ea_split = 1;
 968         else
 969                 return 0;
 970
 971         if (stuffed) {
 972                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 973                 if (error)
 974                         return error;
 975         } else {
 976                 unsigned int blks;
 977
 978                 es->es_bh = bh;
 979                 es->es_ea = ea;
 980                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 981                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 982
 983                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 984                                           ea_set_simple_alloc, es);
 985                 if (error)
 986                         return error;
 987         }
 988
 989         return 1;
 990 }
 991
 992 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 993                         void *private)
 994 {
 995         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 996         struct buffer_head *indbh, *newbh;
 997         __be64 *eablk;
 998         int error;
 999         int mh_size = sizeof(struct gfs2_meta_header);
1000
1001         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1002                 __be64 *end;
1003
1004                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
1005                                        &indbh);
1006                 if (error)
1007                         return error;
1008
1009                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1010                         error = -EIO;
1011                         goto out;
1012                 }
1013
1014                 eablk = (__be64 *)(indbh->b_data + mh_size);
1015                 end = eablk + sdp->sd_inptrs;
1016
1017                 for (; eablk < end; eablk++)
1018                         if (!*eablk)
1019                                 break;
1020
1021                 if (eablk == end) {
1022                         error = -ENOSPC;
1023                         goto out;
1024                 }
1025
1026                 gfs2_trans_add_meta(ip->i_gl, indbh);
1027         } else {
1028                 u64 blk;
1029                 unsigned int n = 1;
1030                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1031                 if (error)
1032                         return error;
1033                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1034                 indbh = gfs2_meta_new(ip->i_gl, blk);
1035                 gfs2_trans_add_meta(ip->i_gl, indbh);
1036                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1037                 gfs2_buffer_clear_tail(indbh, mh_size);
1038
1039                 eablk = (__be64 *)(indbh->b_data + mh_size);
1040                 *eablk = cpu_to_be64(ip->i_eattr);
1041                 ip->i_eattr = blk;
1042                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1043                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1044
1045                 eablk++;
1046         }
1047
1048         error = ea_alloc_blk(ip, &newbh);
1049         if (error)
1050                 goto out;
1051
1052         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1053         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1054         brelse(newbh);
1055         if (error)
1056                 goto out;
1057
1058         if (private)
1059                 ea_set_remove_stuffed(ip, private);
1060
1061 out:
1062         brelse(indbh);
1063         return error;
1064 }
1065
1066 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1067                     const void *value, size_t size, struct gfs2_ea_location *el)
1068 {
1069         struct gfs2_ea_request er;
1070         struct ea_set es;
1071         unsigned int blks = 2;
1072         int error;
1073
1074         er.er_type = type;
1075         er.er_name = name;
1076         er.er_data = (void *)value;
1077         er.er_name_len = strlen(name);
1078         er.er_data_len = size;
1079
1080         memset(&es, 0, sizeof(struct ea_set));
1081         es.es_er = &er;
1082         es.es_el = el;
1083
1084         error = ea_foreach(ip, ea_set_simple, &es);
1085         if (error > 0)
1086                 return 0;
1087         if (error)
1088                 return error;
1089
1090         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1091                 blks++;
1092         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1093                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1094
1095         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1096 }
1097
1098 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1099                                    struct gfs2_ea_location *el)
1100 {
1101         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1102                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1103                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1104                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1105         }
1106
1107         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1108 }
1109
1110 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1111 {
1112         struct gfs2_ea_header *ea = el->el_ea;
1113         struct gfs2_ea_header *prev = el->el_prev;
1114         struct buffer_head *dibh;
1115         int error;
1116
1117         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1118         if (error)
1119                 return error;
1120
1121         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1122
1123         if (prev) {
1124                 u32 len;
1125
1126                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1127                 prev->ea_rec_len = cpu_to_be32(len);
1128
1129                 if (GFS2_EA_IS_LAST(ea))
1130                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1131         } else {
1132                 ea->ea_type = GFS2_EATYPE_UNUSED;
1133         }
1134
1135         error = gfs2_meta_inode_buffer(ip, &dibh);
1136         if (!error) {
1137                 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1138                 gfs2_trans_add_meta(ip->i_gl, dibh);
1139                 gfs2_dinode_out(ip, dibh->b_data);
1140                 brelse(dibh);
1141         }
1142
1143         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1144
1145         return error;
1146 }
1147
1148 /**
1149  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1150  * @ip: The inode
1151  * @type: The type of the extended attribute
1152  * @name: The name of the extended attribute
1153  *
1154  * This is not called directly by the VFS since we use the (common)
1155  * scheme of making a "set with NULL data" mean a remove request. Note
1156  * that this is different from a set with zero length data.
1157  *
1158  * Returns: 0, or errno on failure
1159  */
1160
1161 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1162 {
1163         struct gfs2_ea_location el;
1164         int error;
1165
1166         if (!ip->i_eattr)
1167                 return -ENODATA;
1168
1169         error = gfs2_ea_find(ip, type, name, &el);
1170         if (error)
1171                 return error;
1172         if (!el.el_ea)
1173                 return -ENODATA;
1174
1175         if (GFS2_EA_IS_STUFFED(el.el_ea))
1176                 error = ea_remove_stuffed(ip, &el);
1177         else
1178                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1179
1180         brelse(el.el_bh);
1181
1182         return error;
1183 }
1184
1185 /**
1186  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1187  * @ip: The inode
1188  * @name: The name of the extended attribute
1189  * @value: The value of the extended attribute (NULL for remove)
1190  * @size: The size of the @value argument
1191  * @flags: Create or Replace
1192  * @type: The type of the extended attribute
1193  *
1194  * See gfs2_xattr_remove() for details of the removal of xattrs.
1195  *
1196  * Returns: 0 or errno on failure
1197  */
1198
1199 int __gfs2_xattr_set(struct inode *inode, const char *name,
1200                    const void *value, size_t size, int flags, int type)
1201 {
1202         struct gfs2_inode *ip = GFS2_I(inode);
1203         struct gfs2_sbd *sdp = GFS2_SB(inode);
1204         struct gfs2_ea_location el;
1205         unsigned int namel = strlen(name);
1206         int error;
1207
1208         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1209                 return -EPERM;
1210         if (namel > GFS2_EA_MAX_NAME_LEN)
1211                 return -ERANGE;
1212
1213         if (value == NULL) {
1214                 error = gfs2_xattr_remove(ip, type, name);
1215                 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1216                         error = 0;
1217                 return error;
1218         }
1219
1220         if (ea_check_size(sdp, namel, size))
1221                 return -ERANGE;
1222
1223         if (!ip->i_eattr) {
1224                 if (flags & XATTR_REPLACE)
1225                         return -ENODATA;
1226                 return ea_init(ip, type, name, value, size);
1227         }
1228
1229         error = gfs2_ea_find(ip, type, name, &el);
1230         if (error)
1231                 return error;
1232
1233         if (el.el_ea) {
1234                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1235                         brelse(el.el_bh);
1236                         return -EPERM;
1237                 }
1238
1239                 error = -EEXIST;
1240                 if (!(flags & XATTR_CREATE)) {
1241                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1242                         error = ea_set_i(ip, type, name, value, size, &el);
1243                         if (!error && unstuffed)
1244                                 ea_set_remove_unstuffed(ip, &el);
1245                 }
1246
1247                 brelse(el.el_bh);
1248                 return error;
1249         }
1250
1251         error = -ENODATA;
1252         if (!(flags & XATTR_REPLACE))
1253                 error = ea_set_i(ip, type, name, value, size, NULL);
1254
1255         return error;
1256 }
1257
1258 static int gfs2_xattr_set(const struct xattr_handler *handler,
1259                           struct dentry *unused, struct inode *inode,
1260                           const char *name, const void *value,
1261                           size_t size, int flags)
1262 {
1263         struct gfs2_inode *ip = GFS2_I(inode);
1264         struct gfs2_holder gh;
1265         int ret;
1266
1267         ret = gfs2_rsqa_alloc(ip);
1268         if (ret)
1269                 return ret;
1270
1271         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1272         if (ret)
1273                 return ret;
1274         ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1275         gfs2_glock_dq_uninit(&gh);
1276         return ret;
1277 }
1278
1279 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1280 {
1281         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1282         struct gfs2_rgrp_list rlist;
1283         struct buffer_head *indbh, *dibh;
1284         __be64 *eablk, *end;
1285         unsigned int rg_blocks = 0;
1286         u64 bstart = 0;
1287         unsigned int blen = 0;
1288         unsigned int blks = 0;
1289         unsigned int x;
1290         int error;
1291
1292         error = gfs2_rindex_update(sdp);
1293         if (error)
1294                 return error;
1295
1296         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1297
1298         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1299         if (error)
1300                 return error;
1301
1302         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1303                 error = -EIO;
1304                 goto out;
1305         }
1306
1307         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1308         end = eablk + sdp->sd_inptrs;
1309
1310         for (; eablk < end; eablk++) {
1311                 u64 bn;
1312
1313                 if (!*eablk)
1314                         break;
1315                 bn = be64_to_cpu(*eablk);
1316
1317                 if (bstart + blen == bn)
1318                         blen++;
1319                 else {
1320                         if (bstart)
1321                                 gfs2_rlist_add(ip, &rlist, bstart);
1322                         bstart = bn;
1323                         blen = 1;
1324                 }
1325                 blks++;
1326         }
1327         if (bstart)
1328                 gfs2_rlist_add(ip, &rlist, bstart);
1329         else
1330                 goto out;
1331
1332         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1333
1334         for (x = 0; x < rlist.rl_rgrps; x++) {
1335                 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1336
1337                 rg_blocks += rgd->rd_length;
1338         }
1339
1340         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1341         if (error)
1342                 goto out_rlist_free;
1343
1344         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1345                                  RES_STATFS + RES_QUOTA, blks);
1346         if (error)
1347                 goto out_gunlock;
1348
1349         gfs2_trans_add_meta(ip->i_gl, indbh);
1350
1351         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1352         bstart = 0;
1353         blen = 0;
1354
1355         for (; eablk < end; eablk++) {
1356                 u64 bn;
1357
1358                 if (!*eablk)
1359                         break;
1360                 bn = be64_to_cpu(*eablk);
1361
1362                 if (bstart + blen == bn)
1363                         blen++;
1364                 else {
1365                         if (bstart)
1366                                 gfs2_free_meta(ip, bstart, blen);
1367                         bstart = bn;
1368                         blen = 1;
1369                 }
1370
1371                 *eablk = 0;
1372                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1373         }
1374         if (bstart)
1375                 gfs2_free_meta(ip, bstart, blen);
1376
1377         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1378
1379         error = gfs2_meta_inode_buffer(ip, &dibh);
1380         if (!error) {
1381                 gfs2_trans_add_meta(ip->i_gl, dibh);
1382                 gfs2_dinode_out(ip, dibh->b_data);
1383                 brelse(dibh);
1384         }
1385
1386         gfs2_trans_end(sdp);
1387
1388 out_gunlock:
1389         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1390 out_rlist_free:
1391         gfs2_rlist_free(&rlist);
1392 out:
1393         brelse(indbh);
1394         return error;
1395 }
1396
1397 static int ea_dealloc_block(struct gfs2_inode *ip)
1398 {
1399         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1400         struct gfs2_rgrpd *rgd;
1401         struct buffer_head *dibh;
1402         struct gfs2_holder gh;
1403         int error;
1404
1405         error = gfs2_rindex_update(sdp);
1406         if (error)
1407                 return error;
1408
1409         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1410         if (!rgd) {
1411                 gfs2_consist_inode(ip);
1412                 return -EIO;
1413         }
1414
1415         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1416         if (error)
1417                 return error;
1418
1419         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1420                                  RES_QUOTA, 1);
1421         if (error)
1422                 goto out_gunlock;
1423
1424         gfs2_free_meta(ip, ip->i_eattr, 1);
1425
1426         ip->i_eattr = 0;
1427         gfs2_add_inode_blocks(&ip->i_inode, -1);
1428
1429         error = gfs2_meta_inode_buffer(ip, &dibh);
1430         if (!error) {
1431                 gfs2_trans_add_meta(ip->i_gl, dibh);
1432                 gfs2_dinode_out(ip, dibh->b_data);
1433                 brelse(dibh);
1434         }
1435
1436         gfs2_trans_end(sdp);
1437
1438 out_gunlock:
1439         gfs2_glock_dq_uninit(&gh);
1440         return error;
1441 }
1442
1443 /**
1444  * gfs2_ea_dealloc - deallocate the extended attribute fork
1445  * @ip: the inode
1446  *
1447  * Returns: errno
1448  */
1449
1450 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1451 {
1452         int error;
1453
1454         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1455         if (error)
1456                 return error;
1457
1458         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1459         if (error)
1460                 return error;
1461
1462         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1463         if (error)
1464                 goto out_quota;
1465
1466         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1467                 error = ea_dealloc_indirect(ip);
1468                 if (error)
1469                         goto out_quota;
1470         }
1471
1472         error = ea_dealloc_block(ip);
1473
1474 out_quota:
1475         gfs2_quota_unhold(ip);
1476         return error;
1477 }
1478
1479 static const struct xattr_handler gfs2_xattr_user_handler = {
1480         .prefix = XATTR_USER_PREFIX,
1481         .flags  = GFS2_EATYPE_USR,
1482         .get    = gfs2_xattr_get,
1483         .set    = gfs2_xattr_set,
1484 };
1485
1486 static const struct xattr_handler gfs2_xattr_security_handler = {
1487         .prefix = XATTR_SECURITY_PREFIX,
1488         .flags  = GFS2_EATYPE_SECURITY,
1489         .get    = gfs2_xattr_get,
1490         .set    = gfs2_xattr_set,
1491 };
1492
1493 const struct xattr_handler *gfs2_xattr_handlers[] = {
1494         &gfs2_xattr_user_handler,
1495         &gfs2_xattr_security_handler,
1496         &posix_acl_access_xattr_handler,
1497         &posix_acl_default_xattr_handler,
1498         NULL,
1499 };
1500