fs/gfs2/xattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/posix_acl_xattr.h>
  17 #include <asm/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "acl.h"
  22 #include "xattr.h"
  23 #include "glock.h"
  24 #include "inode.h"
  25 #include "meta_io.h"
  26 #include "quota.h"
  27 #include "rgrp.h"
  28 #include "trans.h"
  29 #include "util.h"
  30
  31 /**
  32  * ea_calc_size - returns the acutal number of bytes the request will take up
  33  *                (not counting any unstuffed data blocks)
  34  * @sdp:
  35  * @er:
  36  * @size:
  37  *
  38  * Returns: 1 if the EA should be stuffed
  39  */
  40
  41 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  42                         unsigned int *size)
  43 {
  44         unsigned int jbsize = sdp->sd_jbsize;
  45
  46         /* Stuffed */
  47         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  48
  49         if (*size <= jbsize)
  50                 return 1;
  51
  52         /* Unstuffed */
  53         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  54                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  55
  56         return 0;
  57 }
  58
  59 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  60 {
  61         unsigned int size;
  62
  63         if (dsize > GFS2_EA_MAX_DATA_LEN)
  64                 return -ERANGE;
  65
  66         ea_calc_size(sdp, nsize, dsize, &size);
  67
  68         /* This can only happen with 512 byte blocks */
  69         if (size > sdp->sd_jbsize)
  70                 return -ERANGE;
  71
  72         return 0;
  73 }
  74
  75 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  76                           struct gfs2_ea_header *ea,
  77                           struct gfs2_ea_header *prev, void *private);
  78
  79 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  80                         ea_call_t ea_call, void *data)
  81 {
  82         struct gfs2_ea_header *ea, *prev = NULL;
  83         int error = 0;
  84
  85         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  86                 return -EIO;
  87
  88         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  89                 if (!GFS2_EA_REC_LEN(ea))
  90                         goto fail;
  91                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  92                                                   bh->b_data + bh->b_size))
  93                         goto fail;
  94                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  95                         goto fail;
  96
  97                 error = ea_call(ip, bh, ea, prev, data);
  98                 if (error)
  99                         return error;
 100
 101                 if (GFS2_EA_IS_LAST(ea)) {
 102                         if ((char *)GFS2_EA2NEXT(ea) !=
 103                             bh->b_data + bh->b_size)
 104                                 goto fail;
 105                         break;
 106                 }
 107         }
 108
 109         return error;
 110
 111 fail:
 112         gfs2_consist_inode(ip);
 113         return -EIO;
 114 }
 115
 116 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 117 {
 118         struct buffer_head *bh, *eabh;
 119         __be64 *eablk, *end;
 120         int error;
 121
 122         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
 123         if (error)
 124                 return error;
 125
 126         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 127                 error = ea_foreach_i(ip, bh, ea_call, data);
 128                 goto out;
 129         }
 130
 131         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 132                 error = -EIO;
 133                 goto out;
 134         }
 135
 136         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 137         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 138
 139         for (; eablk < end; eablk++) {
 140                 u64 bn;
 141
 142                 if (!*eablk)
 143                         break;
 144                 bn = be64_to_cpu(*eablk);
 145
 146                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
 147                 if (error)
 148                         break;
 149                 error = ea_foreach_i(ip, eabh, ea_call, data);
 150                 brelse(eabh);
 151                 if (error)
 152                         break;
 153         }
 154 out:
 155         brelse(bh);
 156         return error;
 157 }
 158
 159 struct ea_find {
 160         int type;
 161         const char *name;
 162         size_t namel;
 163         struct gfs2_ea_location *ef_el;
 164 };
 165
 166 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 167                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 168                      void *private)
 169 {
 170         struct ea_find *ef = private;
 171
 172         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 173                 return 0;
 174
 175         if (ea->ea_type == ef->type) {
 176                 if (ea->ea_name_len == ef->namel &&
 177                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 178                         struct gfs2_ea_location *el = ef->ef_el;
 179                         get_bh(bh);
 180                         el->el_bh = bh;
 181                         el->el_ea = ea;
 182                         el->el_prev = prev;
 183                         return 1;
 184                 }
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 191                         struct gfs2_ea_location *el)
 192 {
 193         struct ea_find ef;
 194         int error;
 195
 196         ef.type = type;
 197         ef.name = name;
 198         ef.namel = strlen(name);
 199         ef.ef_el = el;
 200
 201         memset(el, 0, sizeof(struct gfs2_ea_location));
 202
 203         error = ea_foreach(ip, ea_find_i, &ef);
 204         if (error > 0)
 205                 return 0;
 206
 207         return error;
 208 }
 209
 210 /**
 211  * ea_dealloc_unstuffed -
 212  * @ip:
 213  * @bh:
 214  * @ea:
 215  * @prev:
 216  * @private:
 217  *
 218  * Take advantage of the fact that all unstuffed blocks are
 219  * allocated from the same RG.  But watch, this may not always
 220  * be true.
 221  *
 222  * Returns: errno
 223  */
 224
 225 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 226                                 struct gfs2_ea_header *ea,
 227                                 struct gfs2_ea_header *prev, void *private)
 228 {
 229         int *leave = private;
 230         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 231         struct gfs2_rgrpd *rgd;
 232         struct gfs2_holder rg_gh;
 233         struct buffer_head *dibh;
 234         __be64 *dataptrs;
 235         u64 bn = 0;
 236         u64 bstart = 0;
 237         unsigned int blen = 0;
 238         unsigned int blks = 0;
 239         unsigned int x;
 240         int error;
 241
 242         error = gfs2_rindex_update(sdp);
 243         if (error)
 244                 return error;
 245
 246         if (GFS2_EA_IS_STUFFED(ea))
 247                 return 0;
 248
 249         dataptrs = GFS2_EA2DATAPTRS(ea);
 250         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 251                 if (*dataptrs) {
 252                         blks++;
 253                         bn = be64_to_cpu(*dataptrs);
 254                 }
 255         }
 256         if (!blks)
 257                 return 0;
 258
 259         rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 260         if (!rgd) {
 261                 gfs2_consist_inode(ip);
 262                 return -EIO;
 263         }
 264
 265         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 266         if (error)
 267                 return error;
 268
 269         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 270                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 271         if (error)
 272                 goto out_gunlock;
 273
 274         gfs2_trans_add_meta(ip->i_gl, bh);
 275
 276         dataptrs = GFS2_EA2DATAPTRS(ea);
 277         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 278                 if (!*dataptrs)
 279                         break;
 280                 bn = be64_to_cpu(*dataptrs);
 281
 282                 if (bstart + blen == bn)
 283                         blen++;
 284                 else {
 285                         if (bstart)
 286                                 gfs2_free_meta(ip, bstart, blen);
 287                         bstart = bn;
 288                         blen = 1;
 289                 }
 290
 291                 *dataptrs = 0;
 292                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 293         }
 294         if (bstart)
 295                 gfs2_free_meta(ip, bstart, blen);
 296
 297         if (prev && !leave) {
 298                 u32 len;
 299
 300                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 301                 prev->ea_rec_len = cpu_to_be32(len);
 302
 303                 if (GFS2_EA_IS_LAST(ea))
 304                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 305         } else {
 306                 ea->ea_type = GFS2_EATYPE_UNUSED;
 307                 ea->ea_num_ptrs = 0;
 308         }
 309
 310         error = gfs2_meta_inode_buffer(ip, &dibh);
 311         if (!error) {
 312                 ip->i_inode.i_ctime = CURRENT_TIME;
 313                 gfs2_trans_add_meta(ip->i_gl, dibh);
 314                 gfs2_dinode_out(ip, dibh->b_data);
 315                 brelse(dibh);
 316         }
 317
 318         gfs2_trans_end(sdp);
 319
 320 out_gunlock:
 321         gfs2_glock_dq_uninit(&rg_gh);
 322         return error;
 323 }
 324
 325 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 326                                struct gfs2_ea_header *ea,
 327                                struct gfs2_ea_header *prev, int leave)
 328 {
 329         int error;
 330
 331         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 332         if (error)
 333                 return error;
 334
 335         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 336         if (error)
 337                 goto out_alloc;
 338
 339         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341         gfs2_quota_unhold(ip);
 342 out_alloc:
 343         return error;
 344 }
 345
 346 struct ea_list {
 347         struct gfs2_ea_request *ei_er;
 348         unsigned int ei_size;
 349 };
 350
 351 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 352 {
 353         switch (ea->ea_type) {
 354         case GFS2_EATYPE_USR:
 355                 return 5 + ea->ea_name_len + 1;
 356         case GFS2_EATYPE_SYS:
 357                 return 7 + ea->ea_name_len + 1;
 358         case GFS2_EATYPE_SECURITY:
 359                 return 9 + ea->ea_name_len + 1;
 360         default:
 361                 return 0;
 362         }
 363 }
 364
 365 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 366                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 367                      void *private)
 368 {
 369         struct ea_list *ei = private;
 370         struct gfs2_ea_request *er = ei->ei_er;
 371         unsigned int ea_size = gfs2_ea_strlen(ea);
 372
 373         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 374                 return 0;
 375
 376         if (er->er_data_len) {
 377                 char *prefix = NULL;
 378                 unsigned int l = 0;
 379                 char c = 0;
 380
 381                 if (ei->ei_size + ea_size > er->er_data_len)
 382                         return -ERANGE;
 383
 384                 switch (ea->ea_type) {
 385                 case GFS2_EATYPE_USR:
 386                         prefix = "user.";
 387                         l = 5;
 388                         break;
 389                 case GFS2_EATYPE_SYS:
 390                         prefix = "system.";
 391                         l = 7;
 392                         break;
 393                 case GFS2_EATYPE_SECURITY:
 394                         prefix = "security.";
 395                         l = 9;
 396                         break;
 397                 }
 398
 399                 BUG_ON(l == 0);
 400
 401                 memcpy(er->er_data + ei->ei_size, prefix, l);
 402                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 403                        ea->ea_name_len);
 404                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 405         }
 406
 407         ei->ei_size += ea_size;
 408
 409         return 0;
 410 }
 411
 412 /**
 413  * gfs2_listxattr - List gfs2 extended attributes
 414  * @dentry: The dentry whose inode we are interested in
 415  * @buffer: The buffer to write the results
 416  * @size: The size of the buffer
 417  *
 418  * Returns: actual size of data on success, -errno on error
 419  */
 420
 421 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 422 {
 423         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 424         struct gfs2_ea_request er;
 425         struct gfs2_holder i_gh;
 426         int error;
 427
 428         memset(&er, 0, sizeof(struct gfs2_ea_request));
 429         if (size) {
 430                 er.er_data = buffer;
 431                 er.er_data_len = size;
 432         }
 433
 434         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 435         if (error)
 436                 return error;
 437
 438         if (ip->i_eattr) {
 439                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 440
 441                 error = ea_foreach(ip, ea_list_i, &ei);
 442                 if (!error)
 443                         error = ei.ei_size;
 444         }
 445
 446         gfs2_glock_dq_uninit(&i_gh);
 447
 448         return error;
 449 }
 450
 451 /**
 452  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 453  *                     request buffer
 454  * @ip: The GFS2 inode
 455  * @ea: The extended attribute header structure
 456  * @din: The data to be copied in
 457  * @dout: The data to be copied out (one of din,dout will be NULL)
 458  *
 459  * Returns: errno
 460  */
 461
 462 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 463                                const char *din, char *dout)
 464 {
 465         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 466         struct buffer_head **bh;
 467         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 468         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 469         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 470         unsigned int x;
 471         int error = 0;
 472         unsigned char *pos;
 473         unsigned cp_size;
 474
 475         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 476         if (!bh)
 477                 return -ENOMEM;
 478
 479         for (x = 0; x < nptrs; x++) {
 480                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
 481                                        bh + x);
 482                 if (error) {
 483                         while (x--)
 484                                 brelse(bh[x]);
 485                         goto out;
 486                 }
 487                 dataptrs++;
 488         }
 489
 490         for (x = 0; x < nptrs; x++) {
 491                 error = gfs2_meta_wait(sdp, bh[x]);
 492                 if (error) {
 493                         for (; x < nptrs; x++)
 494                                 brelse(bh[x]);
 495                         goto out;
 496                 }
 497                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 498                         for (; x < nptrs; x++)
 499                                 brelse(bh[x]);
 500                         error = -EIO;
 501                         goto out;
 502                 }
 503
 504                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 505                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 506
 507                 if (dout) {
 508                         memcpy(dout, pos, cp_size);
 509                         dout += sdp->sd_jbsize;
 510                 }
 511
 512                 if (din) {
 513                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 514                         memcpy(pos, din, cp_size);
 515                         din += sdp->sd_jbsize;
 516                 }
 517
 518                 amount -= sdp->sd_jbsize;
 519                 brelse(bh[x]);
 520         }
 521
 522 out:
 523         kfree(bh);
 524         return error;
 525 }
 526
 527 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 528                             char *data, size_t size)
 529 {
 530         int ret;
 531         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 532         if (len > size)
 533                 return -ERANGE;
 534
 535         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 536                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 537                 return len;
 538         }
 539         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 540         if (ret < 0)
 541                 return ret;
 542         return len;
 543 }
 544
 545 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 546 {
 547         struct gfs2_ea_location el;
 548         int error;
 549         int len;
 550         char *data;
 551
 552         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 553         if (error)
 554                 return error;
 555         if (!el.el_ea)
 556                 goto out;
 557         if (!GFS2_EA_DATA_LEN(el.el_ea))
 558                 goto out;
 559
 560         len = GFS2_EA_DATA_LEN(el.el_ea);
 561         data = kmalloc(len, GFP_NOFS);
 562         error = -ENOMEM;
 563         if (data == NULL)
 564                 goto out;
 565
 566         error = gfs2_ea_get_copy(ip, &el, data, len);
 567         if (error < 0)
 568                 kfree(data);
 569         else
 570                 *ppdata = data;
 571 out:
 572         brelse(el.el_bh);
 573         return error;
 574 }
 575
 576 /**
 577  * gfs2_xattr_get - Get a GFS2 extended attribute
 578  * @inode: The inode
 579  * @name: The name of the extended attribute
 580  * @buffer: The buffer to write the result into
 581  * @size: The size of the buffer
 582  * @type: The type of extended attribute
 583  *
 584  * Returns: actual size of data on success, -errno on error
 585  */
 586 static int __gfs2_xattr_get(struct inode *inode, const char *name,
 587                             void *buffer, size_t size, int type)
 588 {
 589         struct gfs2_inode *ip = GFS2_I(inode);
 590         struct gfs2_ea_location el;
 591         int error;
 592
 593         if (!ip->i_eattr)
 594                 return -ENODATA;
 595         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 596                 return -EINVAL;
 597
 598         error = gfs2_ea_find(ip, type, name, &el);
 599         if (error)
 600                 return error;
 601         if (!el.el_ea)
 602                 return -ENODATA;
 603         if (size)
 604                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 605         else
 606                 error = GFS2_EA_DATA_LEN(el.el_ea);
 607         brelse(el.el_bh);
 608
 609         return error;
 610 }
 611
 612 static int gfs2_xattr_get(const struct xattr_handler *handler,
 613                           struct dentry *unused, struct inode *inode,
 614                           const char *name, void *buffer, size_t size)
 615 {
 616         struct gfs2_inode *ip = GFS2_I(inode);
 617         struct gfs2_holder gh;
 618         bool need_unlock = false;
 619         int ret;
 620
 621         /* During lookup, SELinux calls this function with the glock locked. */
 622
 623         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 624                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 625                 if (ret)
 626                         return ret;
 627                 need_unlock = true;
 628         }
 629         ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
 630         if (need_unlock)
 631                 gfs2_glock_dq_uninit(&gh);
 632         return ret;
 633 }
 634
 635 /**
 636  * ea_alloc_blk - allocates a new block for extended attributes.
 637  * @ip: A pointer to the inode that's getting extended attributes
 638  * @bhp: Pointer to pointer to a struct buffer_head
 639  *
 640  * Returns: errno
 641  */
 642
 643 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 644 {
 645         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 646         struct gfs2_ea_header *ea;
 647         unsigned int n = 1;
 648         u64 block;
 649         int error;
 650
 651         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 652         if (error)
 653                 return error;
 654         gfs2_trans_add_unrevoke(sdp, block, 1);
 655         *bhp = gfs2_meta_new(ip->i_gl, block);
 656         gfs2_trans_add_meta(ip->i_gl, *bhp);
 657         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 658         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 659
 660         ea = GFS2_EA_BH2FIRST(*bhp);
 661         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 662         ea->ea_type = GFS2_EATYPE_UNUSED;
 663         ea->ea_flags = GFS2_EAFLAG_LAST;
 664         ea->ea_num_ptrs = 0;
 665
 666         gfs2_add_inode_blocks(&ip->i_inode, 1);
 667
 668         return 0;
 669 }
 670
 671 /**
 672  * ea_write - writes the request info to an ea, creating new blocks if
 673  *            necessary
 674  * @ip: inode that is being modified
 675  * @ea: the location of the new ea in a block
 676  * @er: the write request
 677  *
 678  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 679  *
 680  * returns : errno
 681  */
 682
 683 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 684                     struct gfs2_ea_request *er)
 685 {
 686         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 687         int error;
 688
 689         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 690         ea->ea_name_len = er->er_name_len;
 691         ea->ea_type = er->er_type;
 692         ea->__pad = 0;
 693
 694         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 695
 696         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 697                 ea->ea_num_ptrs = 0;
 698                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 699         } else {
 700                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 701                 const char *data = er->er_data;
 702                 unsigned int data_len = er->er_data_len;
 703                 unsigned int copy;
 704                 unsigned int x;
 705
 706                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 707                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 708                         struct buffer_head *bh;
 709                         u64 block;
 710                         int mh_size = sizeof(struct gfs2_meta_header);
 711                         unsigned int n = 1;
 712
 713                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 714                         if (error)
 715                                 return error;
 716                         gfs2_trans_add_unrevoke(sdp, block, 1);
 717                         bh = gfs2_meta_new(ip->i_gl, block);
 718                         gfs2_trans_add_meta(ip->i_gl, bh);
 719                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 720
 721                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 722
 723                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 724                                                            data_len;
 725                         memcpy(bh->b_data + mh_size, data, copy);
 726                         if (copy < sdp->sd_jbsize)
 727                                 memset(bh->b_data + mh_size + copy, 0,
 728                                        sdp->sd_jbsize - copy);
 729
 730                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 731                         data += copy;
 732                         data_len -= copy;
 733
 734                         brelse(bh);
 735                 }
 736
 737                 gfs2_assert_withdraw(sdp, !data_len);
 738         }
 739
 740         return 0;
 741 }
 742
 743 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 744                                    struct gfs2_ea_request *er, void *private);
 745
 746 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 747                              unsigned int blks,
 748                              ea_skeleton_call_t skeleton_call, void *private)
 749 {
 750         struct gfs2_alloc_parms ap = { .target = blks };
 751         struct buffer_head *dibh;
 752         int error;
 753
 754         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 755         if (error)
 756                 return error;
 757
 758         error = gfs2_quota_lock_check(ip, &ap);
 759         if (error)
 760                 return error;
 761
 762         error = gfs2_inplace_reserve(ip, &ap);
 763         if (error)
 764                 goto out_gunlock_q;
 765
 766         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 767                                  blks + gfs2_rg_blocks(ip, blks) +
 768                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 769         if (error)
 770                 goto out_ipres;
 771
 772         error = skeleton_call(ip, er, private);
 773         if (error)
 774                 goto out_end_trans;
 775
 776         error = gfs2_meta_inode_buffer(ip, &dibh);
 777         if (!error) {
 778                 ip->i_inode.i_ctime = CURRENT_TIME;
 779                 gfs2_trans_add_meta(ip->i_gl, dibh);
 780                 gfs2_dinode_out(ip, dibh->b_data);
 781                 brelse(dibh);
 782         }
 783
 784 out_end_trans:
 785         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 786 out_ipres:
 787         gfs2_inplace_release(ip);
 788 out_gunlock_q:
 789         gfs2_quota_unlock(ip);
 790         return error;
 791 }
 792
 793 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 794                      void *private)
 795 {
 796         struct buffer_head *bh;
 797         int error;
 798
 799         error = ea_alloc_blk(ip, &bh);
 800         if (error)
 801                 return error;
 802
 803         ip->i_eattr = bh->b_blocknr;
 804         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 805
 806         brelse(bh);
 807
 808         return error;
 809 }
 810
 811 /**
 812  * ea_init - initializes a new eattr block
 813  * @ip:
 814  * @er:
 815  *
 816  * Returns: errno
 817  */
 818
 819 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 820                    const void *data, size_t size)
 821 {
 822         struct gfs2_ea_request er;
 823         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 824         unsigned int blks = 1;
 825
 826         er.er_type = type;
 827         er.er_name = name;
 828         er.er_name_len = strlen(name);
 829         er.er_data = (void *)data;
 830         er.er_data_len = size;
 831
 832         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 833                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 834
 835         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 836 }
 837
 838 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 839 {
 840         u32 ea_size = GFS2_EA_SIZE(ea);
 841         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 842                                      ea_size);
 843         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 844         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 845
 846         ea->ea_rec_len = cpu_to_be32(ea_size);
 847         ea->ea_flags ^= last;
 848
 849         new->ea_rec_len = cpu_to_be32(new_size);
 850         new->ea_flags = last;
 851
 852         return new;
 853 }
 854
 855 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 856                                   struct gfs2_ea_location *el)
 857 {
 858         struct gfs2_ea_header *ea = el->el_ea;
 859         struct gfs2_ea_header *prev = el->el_prev;
 860         u32 len;
 861
 862         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 863
 864         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 865                 ea->ea_type = GFS2_EATYPE_UNUSED;
 866                 return;
 867         } else if (GFS2_EA2NEXT(prev) != ea) {
 868                 prev = GFS2_EA2NEXT(prev);
 869                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 870         }
 871
 872         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 873         prev->ea_rec_len = cpu_to_be32(len);
 874
 875         if (GFS2_EA_IS_LAST(ea))
 876                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 877 }
 878
 879 struct ea_set {
 880         int ea_split;
 881
 882         struct gfs2_ea_request *es_er;
 883         struct gfs2_ea_location *es_el;
 884
 885         struct buffer_head *es_bh;
 886         struct gfs2_ea_header *es_ea;
 887 };
 888
 889 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 890                                  struct gfs2_ea_header *ea, struct ea_set *es)
 891 {
 892         struct gfs2_ea_request *er = es->es_er;
 893         struct buffer_head *dibh;
 894         int error;
 895
 896         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 897         if (error)
 898                 return error;
 899
 900         gfs2_trans_add_meta(ip->i_gl, bh);
 901
 902         if (es->ea_split)
 903                 ea = ea_split_ea(ea);
 904
 905         ea_write(ip, ea, er);
 906
 907         if (es->es_el)
 908                 ea_set_remove_stuffed(ip, es->es_el);
 909
 910         error = gfs2_meta_inode_buffer(ip, &dibh);
 911         if (error)
 912                 goto out;
 913         ip->i_inode.i_ctime = CURRENT_TIME;
 914         gfs2_trans_add_meta(ip->i_gl, dibh);
 915         gfs2_dinode_out(ip, dibh->b_data);
 916         brelse(dibh);
 917 out:
 918         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 919         return error;
 920 }
 921
 922 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 923                                struct gfs2_ea_request *er, void *private)
 924 {
 925         struct ea_set *es = private;
 926         struct gfs2_ea_header *ea = es->es_ea;
 927         int error;
 928
 929         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 930
 931         if (es->ea_split)
 932                 ea = ea_split_ea(ea);
 933
 934         error = ea_write(ip, ea, er);
 935         if (error)
 936                 return error;
 937
 938         if (es->es_el)
 939                 ea_set_remove_stuffed(ip, es->es_el);
 940
 941         return 0;
 942 }
 943
 944 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 945                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 946                          void *private)
 947 {
 948         struct ea_set *es = private;
 949         unsigned int size;
 950         int stuffed;
 951         int error;
 952
 953         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 954                                es->es_er->er_data_len, &size);
 955
 956         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 957                 if (GFS2_EA_REC_LEN(ea) < size)
 958                         return 0;
 959                 if (!GFS2_EA_IS_STUFFED(ea)) {
 960                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 961                         if (error)
 962                                 return error;
 963                 }
 964                 es->ea_split = 0;
 965         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 966                 es->ea_split = 1;
 967         else
 968                 return 0;
 969
 970         if (stuffed) {
 971                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 972                 if (error)
 973                         return error;
 974         } else {
 975                 unsigned int blks;
 976
 977                 es->es_bh = bh;
 978                 es->es_ea = ea;
 979                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 980                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 981
 982                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 983                                           ea_set_simple_alloc, es);
 984                 if (error)
 985                         return error;
 986         }
 987
 988         return 1;
 989 }
 990
 991 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 992                         void *private)
 993 {
 994         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 995         struct buffer_head *indbh, *newbh;
 996         __be64 *eablk;
 997         int error;
 998         int mh_size = sizeof(struct gfs2_meta_header);
 999
1000         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1001                 __be64 *end;
1002
1003                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
1004                                        &indbh);
1005                 if (error)
1006                         return error;
1007
1008                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1009                         error = -EIO;
1010                         goto out;
1011                 }
1012
1013                 eablk = (__be64 *)(indbh->b_data + mh_size);
1014                 end = eablk + sdp->sd_inptrs;
1015
1016                 for (; eablk < end; eablk++)
1017                         if (!*eablk)
1018                                 break;
1019
1020                 if (eablk == end) {
1021                         error = -ENOSPC;
1022                         goto out;
1023                 }
1024
1025                 gfs2_trans_add_meta(ip->i_gl, indbh);
1026         } else {
1027                 u64 blk;
1028                 unsigned int n = 1;
1029                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1030                 if (error)
1031                         return error;
1032                 gfs2_trans_add_unrevoke(sdp, blk, 1);
1033                 indbh = gfs2_meta_new(ip->i_gl, blk);
1034                 gfs2_trans_add_meta(ip->i_gl, indbh);
1035                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1036                 gfs2_buffer_clear_tail(indbh, mh_size);
1037
1038                 eablk = (__be64 *)(indbh->b_data + mh_size);
1039                 *eablk = cpu_to_be64(ip->i_eattr);
1040                 ip->i_eattr = blk;
1041                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1042                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1043
1044                 eablk++;
1045         }
1046
1047         error = ea_alloc_blk(ip, &newbh);
1048         if (error)
1049                 goto out;
1050
1051         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1052         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1053         brelse(newbh);
1054         if (error)
1055                 goto out;
1056
1057         if (private)
1058                 ea_set_remove_stuffed(ip, private);
1059
1060 out:
1061         brelse(indbh);
1062         return error;
1063 }
1064
1065 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1066                     const void *value, size_t size, struct gfs2_ea_location *el)
1067 {
1068         struct gfs2_ea_request er;
1069         struct ea_set es;
1070         unsigned int blks = 2;
1071         int error;
1072
1073         er.er_type = type;
1074         er.er_name = name;
1075         er.er_data = (void *)value;
1076         er.er_name_len = strlen(name);
1077         er.er_data_len = size;
1078
1079         memset(&es, 0, sizeof(struct ea_set));
1080         es.es_er = &er;
1081         es.es_el = el;
1082
1083         error = ea_foreach(ip, ea_set_simple, &es);
1084         if (error > 0)
1085                 return 0;
1086         if (error)
1087                 return error;
1088
1089         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1090                 blks++;
1091         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1092                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1093
1094         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1095 }
1096
1097 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1098                                    struct gfs2_ea_location *el)
1099 {
1100         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1101                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1102                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1103                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1104         }
1105
1106         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1107 }
1108
1109 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1110 {
1111         struct gfs2_ea_header *ea = el->el_ea;
1112         struct gfs2_ea_header *prev = el->el_prev;
1113         struct buffer_head *dibh;
1114         int error;
1115
1116         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1117         if (error)
1118                 return error;
1119
1120         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1121
1122         if (prev) {
1123                 u32 len;
1124
1125                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1126                 prev->ea_rec_len = cpu_to_be32(len);
1127
1128                 if (GFS2_EA_IS_LAST(ea))
1129                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1130         } else {
1131                 ea->ea_type = GFS2_EATYPE_UNUSED;
1132         }
1133
1134         error = gfs2_meta_inode_buffer(ip, &dibh);
1135         if (!error) {
1136                 ip->i_inode.i_ctime = CURRENT_TIME;
1137                 gfs2_trans_add_meta(ip->i_gl, dibh);
1138                 gfs2_dinode_out(ip, dibh->b_data);
1139                 brelse(dibh);
1140         }
1141
1142         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1143
1144         return error;
1145 }
1146
1147 /**
1148  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1149  * @ip: The inode
1150  * @type: The type of the extended attribute
1151  * @name: The name of the extended attribute
1152  *
1153  * This is not called directly by the VFS since we use the (common)
1154  * scheme of making a "set with NULL data" mean a remove request. Note
1155  * that this is different from a set with zero length data.
1156  *
1157  * Returns: 0, or errno on failure
1158  */
1159
1160 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1161 {
1162         struct gfs2_ea_location el;
1163         int error;
1164
1165         if (!ip->i_eattr)
1166                 return -ENODATA;
1167
1168         error = gfs2_ea_find(ip, type, name, &el);
1169         if (error)
1170                 return error;
1171         if (!el.el_ea)
1172                 return -ENODATA;
1173
1174         if (GFS2_EA_IS_STUFFED(el.el_ea))
1175                 error = ea_remove_stuffed(ip, &el);
1176         else
1177                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1178
1179         brelse(el.el_bh);
1180
1181         return error;
1182 }
1183
1184 /**
1185  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1186  * @ip: The inode
1187  * @name: The name of the extended attribute
1188  * @value: The value of the extended attribute (NULL for remove)
1189  * @size: The size of the @value argument
1190  * @flags: Create or Replace
1191  * @type: The type of the extended attribute
1192  *
1193  * See gfs2_xattr_remove() for details of the removal of xattrs.
1194  *
1195  * Returns: 0 or errno on failure
1196  */
1197
1198 int __gfs2_xattr_set(struct inode *inode, const char *name,
1199                    const void *value, size_t size, int flags, int type)
1200 {
1201         struct gfs2_inode *ip = GFS2_I(inode);
1202         struct gfs2_sbd *sdp = GFS2_SB(inode);
1203         struct gfs2_ea_location el;
1204         unsigned int namel = strlen(name);
1205         int error;
1206
1207         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1208                 return -EPERM;
1209         if (namel > GFS2_EA_MAX_NAME_LEN)
1210                 return -ERANGE;
1211
1212         if (value == NULL)
1213                 return gfs2_xattr_remove(ip, type, name);
1214
1215         if (ea_check_size(sdp, namel, size))
1216                 return -ERANGE;
1217
1218         if (!ip->i_eattr) {
1219                 if (flags & XATTR_REPLACE)
1220                         return -ENODATA;
1221                 return ea_init(ip, type, name, value, size);
1222         }
1223
1224         error = gfs2_ea_find(ip, type, name, &el);
1225         if (error)
1226                 return error;
1227
1228         if (el.el_ea) {
1229                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1230                         brelse(el.el_bh);
1231                         return -EPERM;
1232                 }
1233
1234                 error = -EEXIST;
1235                 if (!(flags & XATTR_CREATE)) {
1236                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1237                         error = ea_set_i(ip, type, name, value, size, &el);
1238                         if (!error && unstuffed)
1239                                 ea_set_remove_unstuffed(ip, &el);
1240                 }
1241
1242                 brelse(el.el_bh);
1243                 return error;
1244         }
1245
1246         error = -ENODATA;
1247         if (!(flags & XATTR_REPLACE))
1248                 error = ea_set_i(ip, type, name, value, size, NULL);
1249
1250         return error;
1251 }
1252
1253 static int gfs2_xattr_set(const struct xattr_handler *handler,
1254                           struct dentry *dentry, const char *name,
1255                           const void *value, size_t size, int flags)
1256 {
1257         struct inode *inode = d_inode(dentry);
1258         struct gfs2_inode *ip = GFS2_I(inode);
1259         struct gfs2_holder gh;
1260         int ret;
1261
1262         ret = gfs2_rsqa_alloc(ip);
1263         if (ret)
1264                 return ret;
1265
1266         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1267         if (ret)
1268                 return ret;
1269         ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1270         gfs2_glock_dq_uninit(&gh);
1271         return ret;
1272 }
1273
1274 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1275 {
1276         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1277         struct gfs2_rgrp_list rlist;
1278         struct buffer_head *indbh, *dibh;
1279         __be64 *eablk, *end;
1280         unsigned int rg_blocks = 0;
1281         u64 bstart = 0;
1282         unsigned int blen = 0;
1283         unsigned int blks = 0;
1284         unsigned int x;
1285         int error;
1286
1287         error = gfs2_rindex_update(sdp);
1288         if (error)
1289                 return error;
1290
1291         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1292
1293         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1294         if (error)
1295                 return error;
1296
1297         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1298                 error = -EIO;
1299                 goto out;
1300         }
1301
1302         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1303         end = eablk + sdp->sd_inptrs;
1304
1305         for (; eablk < end; eablk++) {
1306                 u64 bn;
1307
1308                 if (!*eablk)
1309                         break;
1310                 bn = be64_to_cpu(*eablk);
1311
1312                 if (bstart + blen == bn)
1313                         blen++;
1314                 else {
1315                         if (bstart)
1316                                 gfs2_rlist_add(ip, &rlist, bstart);
1317                         bstart = bn;
1318                         blen = 1;
1319                 }
1320                 blks++;
1321         }
1322         if (bstart)
1323                 gfs2_rlist_add(ip, &rlist, bstart);
1324         else
1325                 goto out;
1326
1327         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1328
1329         for (x = 0; x < rlist.rl_rgrps; x++) {
1330                 struct gfs2_rgrpd *rgd;
1331                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1332                 rg_blocks += rgd->rd_length;
1333         }
1334
1335         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1336         if (error)
1337                 goto out_rlist_free;
1338
1339         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1340                                  RES_STATFS + RES_QUOTA, blks);
1341         if (error)
1342                 goto out_gunlock;
1343
1344         gfs2_trans_add_meta(ip->i_gl, indbh);
1345
1346         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1347         bstart = 0;
1348         blen = 0;
1349
1350         for (; eablk < end; eablk++) {
1351                 u64 bn;
1352
1353                 if (!*eablk)
1354                         break;
1355                 bn = be64_to_cpu(*eablk);
1356
1357                 if (bstart + blen == bn)
1358                         blen++;
1359                 else {
1360                         if (bstart)
1361                                 gfs2_free_meta(ip, bstart, blen);
1362                         bstart = bn;
1363                         blen = 1;
1364                 }
1365
1366                 *eablk = 0;
1367                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1368         }
1369         if (bstart)
1370                 gfs2_free_meta(ip, bstart, blen);
1371
1372         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1373
1374         error = gfs2_meta_inode_buffer(ip, &dibh);
1375         if (!error) {
1376                 gfs2_trans_add_meta(ip->i_gl, dibh);
1377                 gfs2_dinode_out(ip, dibh->b_data);
1378                 brelse(dibh);
1379         }
1380
1381         gfs2_trans_end(sdp);
1382
1383 out_gunlock:
1384         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1385 out_rlist_free:
1386         gfs2_rlist_free(&rlist);
1387 out:
1388         brelse(indbh);
1389         return error;
1390 }
1391
1392 static int ea_dealloc_block(struct gfs2_inode *ip)
1393 {
1394         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1395         struct gfs2_rgrpd *rgd;
1396         struct buffer_head *dibh;
1397         struct gfs2_holder gh;
1398         int error;
1399
1400         error = gfs2_rindex_update(sdp);
1401         if (error)
1402                 return error;
1403
1404         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1405         if (!rgd) {
1406                 gfs2_consist_inode(ip);
1407                 return -EIO;
1408         }
1409
1410         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1411         if (error)
1412                 return error;
1413
1414         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1415                                  RES_QUOTA, 1);
1416         if (error)
1417                 goto out_gunlock;
1418
1419         gfs2_free_meta(ip, ip->i_eattr, 1);
1420
1421         ip->i_eattr = 0;
1422         gfs2_add_inode_blocks(&ip->i_inode, -1);
1423
1424         error = gfs2_meta_inode_buffer(ip, &dibh);
1425         if (!error) {
1426                 gfs2_trans_add_meta(ip->i_gl, dibh);
1427                 gfs2_dinode_out(ip, dibh->b_data);
1428                 brelse(dibh);
1429         }
1430
1431         gfs2_trans_end(sdp);
1432
1433 out_gunlock:
1434         gfs2_glock_dq_uninit(&gh);
1435         return error;
1436 }
1437
1438 /**
1439  * gfs2_ea_dealloc - deallocate the extended attribute fork
1440  * @ip: the inode
1441  *
1442  * Returns: errno
1443  */
1444
1445 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1446 {
1447         int error;
1448
1449         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1450         if (error)
1451                 return error;
1452
1453         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1454         if (error)
1455                 return error;
1456
1457         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1458         if (error)
1459                 goto out_quota;
1460
1461         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1462                 error = ea_dealloc_indirect(ip);
1463                 if (error)
1464                         goto out_quota;
1465         }
1466
1467         error = ea_dealloc_block(ip);
1468
1469 out_quota:
1470         gfs2_quota_unhold(ip);
1471         return error;
1472 }
1473
1474 static const struct xattr_handler gfs2_xattr_user_handler = {
1475         .prefix = XATTR_USER_PREFIX,
1476         .flags  = GFS2_EATYPE_USR,
1477         .get    = gfs2_xattr_get,
1478         .set    = gfs2_xattr_set,
1479 };
1480
1481 static const struct xattr_handler gfs2_xattr_security_handler = {
1482         .prefix = XATTR_SECURITY_PREFIX,
1483         .flags  = GFS2_EATYPE_SECURITY,
1484         .get    = gfs2_xattr_get,
1485         .set    = gfs2_xattr_set,
1486 };
1487
1488 const struct xattr_handler *gfs2_xattr_handlers[] = {
1489         &gfs2_xattr_user_handler,
1490         &gfs2_xattr_security_handler,
1491         &posix_acl_access_xattr_handler,
1492         &posix_acl_default_xattr_handler,
1493         NULL,
1494 };
1495