linux/fs/gfs2/xattr.c
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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/slab.h>
  11#include <linux/spinlock.h>
  12#include <linux/completion.h>
  13#include <linux/buffer_head.h>
  14#include <linux/xattr.h>
  15#include <linux/gfs2_ondisk.h>
  16#include <asm/uaccess.h>
  17
  18#include "gfs2.h"
  19#include "incore.h"
  20#include "acl.h"
  21#include "xattr.h"
  22#include "glock.h"
  23#include "inode.h"
  24#include "meta_io.h"
  25#include "quota.h"
  26#include "rgrp.h"
  27#include "trans.h"
  28#include "util.h"
  29
  30/**
  31 * ea_calc_size - returns the acutal number of bytes the request will take up
  32 *                (not counting any unstuffed data blocks)
  33 * @sdp:
  34 * @er:
  35 * @size:
  36 *
  37 * Returns: 1 if the EA should be stuffed
  38 */
  39
  40static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  41                        unsigned int *size)
  42{
  43        unsigned int jbsize = sdp->sd_jbsize;
  44
  45        /* Stuffed */
  46        *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  47
  48        if (*size <= jbsize)
  49                return 1;
  50
  51        /* Unstuffed */
  52        *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  53                      (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  54
  55        return 0;
  56}
  57
  58static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  59{
  60        unsigned int size;
  61
  62        if (dsize > GFS2_EA_MAX_DATA_LEN)
  63                return -ERANGE;
  64
  65        ea_calc_size(sdp, nsize, dsize, &size);
  66
  67        /* This can only happen with 512 byte blocks */
  68        if (size > sdp->sd_jbsize)
  69                return -ERANGE;
  70
  71        return 0;
  72}
  73
  74typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  75                          struct gfs2_ea_header *ea,
  76                          struct gfs2_ea_header *prev, void *private);
  77
  78static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  79                        ea_call_t ea_call, void *data)
  80{
  81        struct gfs2_ea_header *ea, *prev = NULL;
  82        int error = 0;
  83
  84        if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  85                return -EIO;
  86
  87        for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  88                if (!GFS2_EA_REC_LEN(ea))
  89                        goto fail;
  90                if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  91                                                  bh->b_data + bh->b_size))
  92                        goto fail;
  93                if (!GFS2_EATYPE_VALID(ea->ea_type))
  94                        goto fail;
  95
  96                error = ea_call(ip, bh, ea, prev, data);
  97                if (error)
  98                        return error;
  99
 100                if (GFS2_EA_IS_LAST(ea)) {
 101                        if ((char *)GFS2_EA2NEXT(ea) !=
 102                            bh->b_data + bh->b_size)
 103                                goto fail;
 104                        break;
 105                }
 106        }
 107
 108        return error;
 109
 110fail:
 111        gfs2_consist_inode(ip);
 112        return -EIO;
 113}
 114
 115static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116{
 117        struct buffer_head *bh, *eabh;
 118        __be64 *eablk, *end;
 119        int error;
 120
 121        error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 122        if (error)
 123                return error;
 124
 125        if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 126                error = ea_foreach_i(ip, bh, ea_call, data);
 127                goto out;
 128        }
 129
 130        if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 131                error = -EIO;
 132                goto out;
 133        }
 134
 135        eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 136        end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 137
 138        for (; eablk < end; eablk++) {
 139                u64 bn;
 140
 141                if (!*eablk)
 142                        break;
 143                bn = be64_to_cpu(*eablk);
 144
 145                error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 146                if (error)
 147                        break;
 148                error = ea_foreach_i(ip, eabh, ea_call, data);
 149                brelse(eabh);
 150                if (error)
 151                        break;
 152        }
 153out:
 154        brelse(bh);
 155        return error;
 156}
 157
 158struct ea_find {
 159        int type;
 160        const char *name;
 161        size_t namel;
 162        struct gfs2_ea_location *ef_el;
 163};
 164
 165static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 166                     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 167                     void *private)
 168{
 169        struct ea_find *ef = private;
 170
 171        if (ea->ea_type == GFS2_EATYPE_UNUSED)
 172                return 0;
 173
 174        if (ea->ea_type == ef->type) {
 175                if (ea->ea_name_len == ef->namel &&
 176                    !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 177                        struct gfs2_ea_location *el = ef->ef_el;
 178                        get_bh(bh);
 179                        el->el_bh = bh;
 180                        el->el_ea = ea;
 181                        el->el_prev = prev;
 182                        return 1;
 183                }
 184        }
 185
 186        return 0;
 187}
 188
 189static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 190                        struct gfs2_ea_location *el)
 191{
 192        struct ea_find ef;
 193        int error;
 194
 195        ef.type = type;
 196        ef.name = name;
 197        ef.namel = strlen(name);
 198        ef.ef_el = el;
 199
 200        memset(el, 0, sizeof(struct gfs2_ea_location));
 201
 202        error = ea_foreach(ip, ea_find_i, &ef);
 203        if (error > 0)
 204                return 0;
 205
 206        return error;
 207}
 208
 209/**
 210 * ea_dealloc_unstuffed -
 211 * @ip:
 212 * @bh:
 213 * @ea:
 214 * @prev:
 215 * @private:
 216 *
 217 * Take advantage of the fact that all unstuffed blocks are
 218 * allocated from the same RG.  But watch, this may not always
 219 * be true.
 220 *
 221 * Returns: errno
 222 */
 223
 224static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 225                                struct gfs2_ea_header *ea,
 226                                struct gfs2_ea_header *prev, void *private)
 227{
 228        int *leave = private;
 229        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230        struct gfs2_rgrpd *rgd;
 231        struct gfs2_holder rg_gh;
 232        struct buffer_head *dibh;
 233        __be64 *dataptrs;
 234        u64 bn = 0;
 235        u64 bstart = 0;
 236        unsigned int blen = 0;
 237        unsigned int blks = 0;
 238        unsigned int x;
 239        int error;
 240
 241        error = gfs2_rindex_update(sdp);
 242        if (error)
 243                return error;
 244
 245        if (GFS2_EA_IS_STUFFED(ea))
 246                return 0;
 247
 248        dataptrs = GFS2_EA2DATAPTRS(ea);
 249        for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 250                if (*dataptrs) {
 251                        blks++;
 252                        bn = be64_to_cpu(*dataptrs);
 253                }
 254        }
 255        if (!blks)
 256                return 0;
 257
 258        rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 259        if (!rgd) {
 260                gfs2_consist_inode(ip);
 261                return -EIO;
 262        }
 263
 264        error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 265        if (error)
 266                return error;
 267
 268        error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 269                                 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 270        if (error)
 271                goto out_gunlock;
 272
 273        gfs2_trans_add_bh(ip->i_gl, bh, 1);
 274
 275        dataptrs = GFS2_EA2DATAPTRS(ea);
 276        for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 277                if (!*dataptrs)
 278                        break;
 279                bn = be64_to_cpu(*dataptrs);
 280
 281                if (bstart + blen == bn)
 282                        blen++;
 283                else {
 284                        if (bstart)
 285                                gfs2_free_meta(ip, bstart, blen);
 286                        bstart = bn;
 287                        blen = 1;
 288                }
 289
 290                *dataptrs = 0;
 291                gfs2_add_inode_blocks(&ip->i_inode, -1);
 292        }
 293        if (bstart)
 294                gfs2_free_meta(ip, bstart, blen);
 295
 296        if (prev && !leave) {
 297                u32 len;
 298
 299                len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 300                prev->ea_rec_len = cpu_to_be32(len);
 301
 302                if (GFS2_EA_IS_LAST(ea))
 303                        prev->ea_flags |= GFS2_EAFLAG_LAST;
 304        } else {
 305                ea->ea_type = GFS2_EATYPE_UNUSED;
 306                ea->ea_num_ptrs = 0;
 307        }
 308
 309        error = gfs2_meta_inode_buffer(ip, &dibh);
 310        if (!error) {
 311                ip->i_inode.i_ctime = CURRENT_TIME;
 312                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 313                gfs2_dinode_out(ip, dibh->b_data);
 314                brelse(dibh);
 315        }
 316
 317        gfs2_trans_end(sdp);
 318
 319out_gunlock:
 320        gfs2_glock_dq_uninit(&rg_gh);
 321        return error;
 322}
 323
 324static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 325                               struct gfs2_ea_header *ea,
 326                               struct gfs2_ea_header *prev, int leave)
 327{
 328        int error;
 329
 330        error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 331        if (error)
 332                return error;
 333
 334        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 335        if (error)
 336                goto out_alloc;
 337
 338        error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 339
 340        gfs2_quota_unhold(ip);
 341out_alloc:
 342        return error;
 343}
 344
 345struct ea_list {
 346        struct gfs2_ea_request *ei_er;
 347        unsigned int ei_size;
 348};
 349
 350static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 351{
 352        switch (ea->ea_type) {
 353        case GFS2_EATYPE_USR:
 354                return 5 + ea->ea_name_len + 1;
 355        case GFS2_EATYPE_SYS:
 356                return 7 + ea->ea_name_len + 1;
 357        case GFS2_EATYPE_SECURITY:
 358                return 9 + ea->ea_name_len + 1;
 359        default:
 360                return 0;
 361        }
 362}
 363
 364static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 365                     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 366                     void *private)
 367{
 368        struct ea_list *ei = private;
 369        struct gfs2_ea_request *er = ei->ei_er;
 370        unsigned int ea_size = gfs2_ea_strlen(ea);
 371
 372        if (ea->ea_type == GFS2_EATYPE_UNUSED)
 373                return 0;
 374
 375        if (er->er_data_len) {
 376                char *prefix = NULL;
 377                unsigned int l = 0;
 378                char c = 0;
 379
 380                if (ei->ei_size + ea_size > er->er_data_len)
 381                        return -ERANGE;
 382
 383                switch (ea->ea_type) {
 384                case GFS2_EATYPE_USR:
 385                        prefix = "user.";
 386                        l = 5;
 387                        break;
 388                case GFS2_EATYPE_SYS:
 389                        prefix = "system.";
 390                        l = 7;
 391                        break;
 392                case GFS2_EATYPE_SECURITY:
 393                        prefix = "security.";
 394                        l = 9;
 395                        break;
 396                }
 397
 398                BUG_ON(l == 0);
 399
 400                memcpy(er->er_data + ei->ei_size, prefix, l);
 401                memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 402                       ea->ea_name_len);
 403                memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 404        }
 405
 406        ei->ei_size += ea_size;
 407
 408        return 0;
 409}
 410
 411/**
 412 * gfs2_listxattr - List gfs2 extended attributes
 413 * @dentry: The dentry whose inode we are interested in
 414 * @buffer: The buffer to write the results
 415 * @size: The size of the buffer
 416 *
 417 * Returns: actual size of data on success, -errno on error
 418 */
 419
 420ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 421{
 422        struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 423        struct gfs2_ea_request er;
 424        struct gfs2_holder i_gh;
 425        int error;
 426
 427        memset(&er, 0, sizeof(struct gfs2_ea_request));
 428        if (size) {
 429                er.er_data = buffer;
 430                er.er_data_len = size;
 431        }
 432
 433        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 434        if (error)
 435                return error;
 436
 437        if (ip->i_eattr) {
 438                struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 439
 440                error = ea_foreach(ip, ea_list_i, &ei);
 441                if (!error)
 442                        error = ei.ei_size;
 443        }
 444
 445        gfs2_glock_dq_uninit(&i_gh);
 446
 447        return error;
 448}
 449
 450/**
 451 * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 452 *                     request buffer
 453 * @ip: The GFS2 inode
 454 * @ea: The extended attribute header structure
 455 * @din: The data to be copied in
 456 * @dout: The data to be copied out (one of din,dout will be NULL)
 457 *
 458 * Returns: errno
 459 */
 460
 461static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 462                               const char *din, char *dout)
 463{
 464        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 465        struct buffer_head **bh;
 466        unsigned int amount = GFS2_EA_DATA_LEN(ea);
 467        unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 468        __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 469        unsigned int x;
 470        int error = 0;
 471        unsigned char *pos;
 472        unsigned cp_size;
 473
 474        bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 475        if (!bh)
 476                return -ENOMEM;
 477
 478        for (x = 0; x < nptrs; x++) {
 479                error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 480                                       bh + x);
 481                if (error) {
 482                        while (x--)
 483                                brelse(bh[x]);
 484                        goto out;
 485                }
 486                dataptrs++;
 487        }
 488
 489        for (x = 0; x < nptrs; x++) {
 490                error = gfs2_meta_wait(sdp, bh[x]);
 491                if (error) {
 492                        for (; x < nptrs; x++)
 493                                brelse(bh[x]);
 494                        goto out;
 495                }
 496                if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 497                        for (; x < nptrs; x++)
 498                                brelse(bh[x]);
 499                        error = -EIO;
 500                        goto out;
 501                }
 502
 503                pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 504                cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 505
 506                if (dout) {
 507                        memcpy(dout, pos, cp_size);
 508                        dout += sdp->sd_jbsize;
 509                }
 510
 511                if (din) {
 512                        gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
 513                        memcpy(pos, din, cp_size);
 514                        din += sdp->sd_jbsize;
 515                }
 516
 517                amount -= sdp->sd_jbsize;
 518                brelse(bh[x]);
 519        }
 520
 521out:
 522        kfree(bh);
 523        return error;
 524}
 525
 526static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 527                            char *data, size_t size)
 528{
 529        int ret;
 530        size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 531        if (len > size)
 532                return -ERANGE;
 533
 534        if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 535                memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 536                return len;
 537        }
 538        ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 539        if (ret < 0)
 540                return ret;
 541        return len;
 542}
 543
 544int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 545{
 546        struct gfs2_ea_location el;
 547        int error;
 548        int len;
 549        char *data;
 550
 551        error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 552        if (error)
 553                return error;
 554        if (!el.el_ea)
 555                goto out;
 556        if (!GFS2_EA_DATA_LEN(el.el_ea))
 557                goto out;
 558
 559        len = GFS2_EA_DATA_LEN(el.el_ea);
 560        data = kmalloc(len, GFP_NOFS);
 561        error = -ENOMEM;
 562        if (data == NULL)
 563                goto out;
 564
 565        error = gfs2_ea_get_copy(ip, &el, data, len);
 566        if (error < 0)
 567                kfree(data);
 568        else
 569                *ppdata = data;
 570out:
 571        brelse(el.el_bh);
 572        return error;
 573}
 574
 575/**
 576 * gfs2_xattr_get - Get a GFS2 extended attribute
 577 * @inode: The inode
 578 * @name: The name of the extended attribute
 579 * @buffer: The buffer to write the result into
 580 * @size: The size of the buffer
 581 * @type: The type of extended attribute
 582 *
 583 * Returns: actual size of data on success, -errno on error
 584 */
 585static int gfs2_xattr_get(struct dentry *dentry, const char *name,
 586                void *buffer, size_t size, int type)
 587{
 588        struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 589        struct gfs2_ea_location el;
 590        int error;
 591
 592        if (!ip->i_eattr)
 593                return -ENODATA;
 594        if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 595                return -EINVAL;
 596
 597        error = gfs2_ea_find(ip, type, name, &el);
 598        if (error)
 599                return error;
 600        if (!el.el_ea)
 601                return -ENODATA;
 602        if (size)
 603                error = gfs2_ea_get_copy(ip, &el, buffer, size);
 604        else
 605                error = GFS2_EA_DATA_LEN(el.el_ea);
 606        brelse(el.el_bh);
 607
 608        return error;
 609}
 610
 611/**
 612 * ea_alloc_blk - allocates a new block for extended attributes.
 613 * @ip: A pointer to the inode that's getting extended attributes
 614 * @bhp: Pointer to pointer to a struct buffer_head
 615 *
 616 * Returns: errno
 617 */
 618
 619static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 620{
 621        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 622        struct gfs2_ea_header *ea;
 623        unsigned int n = 1;
 624        u64 block;
 625        int error;
 626
 627        error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 628        if (error)
 629                return error;
 630        gfs2_trans_add_unrevoke(sdp, block, 1);
 631        *bhp = gfs2_meta_new(ip->i_gl, block);
 632        gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 633        gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 634        gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 635
 636        ea = GFS2_EA_BH2FIRST(*bhp);
 637        ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 638        ea->ea_type = GFS2_EATYPE_UNUSED;
 639        ea->ea_flags = GFS2_EAFLAG_LAST;
 640        ea->ea_num_ptrs = 0;
 641
 642        gfs2_add_inode_blocks(&ip->i_inode, 1);
 643
 644        return 0;
 645}
 646
 647/**
 648 * ea_write - writes the request info to an ea, creating new blocks if
 649 *            necessary
 650 * @ip: inode that is being modified
 651 * @ea: the location of the new ea in a block
 652 * @er: the write request
 653 *
 654 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 655 *
 656 * returns : errno
 657 */
 658
 659static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 660                    struct gfs2_ea_request *er)
 661{
 662        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 663        int error;
 664
 665        ea->ea_data_len = cpu_to_be32(er->er_data_len);
 666        ea->ea_name_len = er->er_name_len;
 667        ea->ea_type = er->er_type;
 668        ea->__pad = 0;
 669
 670        memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 671
 672        if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 673                ea->ea_num_ptrs = 0;
 674                memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 675        } else {
 676                __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 677                const char *data = er->er_data;
 678                unsigned int data_len = er->er_data_len;
 679                unsigned int copy;
 680                unsigned int x;
 681
 682                ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 683                for (x = 0; x < ea->ea_num_ptrs; x++) {
 684                        struct buffer_head *bh;
 685                        u64 block;
 686                        int mh_size = sizeof(struct gfs2_meta_header);
 687                        unsigned int n = 1;
 688
 689                        error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 690                        if (error)
 691                                return error;
 692                        gfs2_trans_add_unrevoke(sdp, block, 1);
 693                        bh = gfs2_meta_new(ip->i_gl, block);
 694                        gfs2_trans_add_bh(ip->i_gl, bh, 1);
 695                        gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 696
 697                        gfs2_add_inode_blocks(&ip->i_inode, 1);
 698
 699                        copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 700                                                           data_len;
 701                        memcpy(bh->b_data + mh_size, data, copy);
 702                        if (copy < sdp->sd_jbsize)
 703                                memset(bh->b_data + mh_size + copy, 0,
 704                                       sdp->sd_jbsize - copy);
 705
 706                        *dataptr++ = cpu_to_be64(bh->b_blocknr);
 707                        data += copy;
 708                        data_len -= copy;
 709
 710                        brelse(bh);
 711                }
 712
 713                gfs2_assert_withdraw(sdp, !data_len);
 714        }
 715
 716        return 0;
 717}
 718
 719typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 720                                   struct gfs2_ea_request *er, void *private);
 721
 722static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 723                             unsigned int blks,
 724                             ea_skeleton_call_t skeleton_call, void *private)
 725{
 726        struct buffer_head *dibh;
 727        int error;
 728
 729        error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 730        if (error)
 731                return error;
 732
 733        error = gfs2_quota_lock_check(ip);
 734        if (error)
 735                return error;
 736
 737        error = gfs2_inplace_reserve(ip, blks);
 738        if (error)
 739                goto out_gunlock_q;
 740
 741        error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 742                                 blks + gfs2_rg_blocks(ip, blks) +
 743                                 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 744        if (error)
 745                goto out_ipres;
 746
 747        error = skeleton_call(ip, er, private);
 748        if (error)
 749                goto out_end_trans;
 750
 751        error = gfs2_meta_inode_buffer(ip, &dibh);
 752        if (!error) {
 753                ip->i_inode.i_ctime = CURRENT_TIME;
 754                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 755                gfs2_dinode_out(ip, dibh->b_data);
 756                brelse(dibh);
 757        }
 758
 759out_end_trans:
 760        gfs2_trans_end(GFS2_SB(&ip->i_inode));
 761out_ipres:
 762        gfs2_inplace_release(ip);
 763out_gunlock_q:
 764        gfs2_quota_unlock(ip);
 765        return error;
 766}
 767
 768static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 769                     void *private)
 770{
 771        struct buffer_head *bh;
 772        int error;
 773
 774        error = ea_alloc_blk(ip, &bh);
 775        if (error)
 776                return error;
 777
 778        ip->i_eattr = bh->b_blocknr;
 779        error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 780
 781        brelse(bh);
 782
 783        return error;
 784}
 785
 786/**
 787 * ea_init - initializes a new eattr block
 788 * @ip:
 789 * @er:
 790 *
 791 * Returns: errno
 792 */
 793
 794static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 795                   const void *data, size_t size)
 796{
 797        struct gfs2_ea_request er;
 798        unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 799        unsigned int blks = 1;
 800
 801        er.er_type = type;
 802        er.er_name = name;
 803        er.er_name_len = strlen(name);
 804        er.er_data = (void *)data;
 805        er.er_data_len = size;
 806
 807        if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 808                blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 809
 810        return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 811}
 812
 813static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 814{
 815        u32 ea_size = GFS2_EA_SIZE(ea);
 816        struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 817                                     ea_size);
 818        u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 819        int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 820
 821        ea->ea_rec_len = cpu_to_be32(ea_size);
 822        ea->ea_flags ^= last;
 823
 824        new->ea_rec_len = cpu_to_be32(new_size);
 825        new->ea_flags = last;
 826
 827        return new;
 828}
 829
 830static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 831                                  struct gfs2_ea_location *el)
 832{
 833        struct gfs2_ea_header *ea = el->el_ea;
 834        struct gfs2_ea_header *prev = el->el_prev;
 835        u32 len;
 836
 837        gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 838
 839        if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 840                ea->ea_type = GFS2_EATYPE_UNUSED;
 841                return;
 842        } else if (GFS2_EA2NEXT(prev) != ea) {
 843                prev = GFS2_EA2NEXT(prev);
 844                gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 845        }
 846
 847        len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 848        prev->ea_rec_len = cpu_to_be32(len);
 849
 850        if (GFS2_EA_IS_LAST(ea))
 851                prev->ea_flags |= GFS2_EAFLAG_LAST;
 852}
 853
 854struct ea_set {
 855        int ea_split;
 856
 857        struct gfs2_ea_request *es_er;
 858        struct gfs2_ea_location *es_el;
 859
 860        struct buffer_head *es_bh;
 861        struct gfs2_ea_header *es_ea;
 862};
 863
 864static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 865                                 struct gfs2_ea_header *ea, struct ea_set *es)
 866{
 867        struct gfs2_ea_request *er = es->es_er;
 868        struct buffer_head *dibh;
 869        int error;
 870
 871        error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 872        if (error)
 873                return error;
 874
 875        gfs2_trans_add_bh(ip->i_gl, bh, 1);
 876
 877        if (es->ea_split)
 878                ea = ea_split_ea(ea);
 879
 880        ea_write(ip, ea, er);
 881
 882        if (es->es_el)
 883                ea_set_remove_stuffed(ip, es->es_el);
 884
 885        error = gfs2_meta_inode_buffer(ip, &dibh);
 886        if (error)
 887                goto out;
 888        ip->i_inode.i_ctime = CURRENT_TIME;
 889        gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 890        gfs2_dinode_out(ip, dibh->b_data);
 891        brelse(dibh);
 892out:
 893        gfs2_trans_end(GFS2_SB(&ip->i_inode));
 894        return error;
 895}
 896
 897static int ea_set_simple_alloc(struct gfs2_inode *ip,
 898                               struct gfs2_ea_request *er, void *private)
 899{
 900        struct ea_set *es = private;
 901        struct gfs2_ea_header *ea = es->es_ea;
 902        int error;
 903
 904        gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 905
 906        if (es->ea_split)
 907                ea = ea_split_ea(ea);
 908
 909        error = ea_write(ip, ea, er);
 910        if (error)
 911                return error;
 912
 913        if (es->es_el)
 914                ea_set_remove_stuffed(ip, es->es_el);
 915
 916        return 0;
 917}
 918
 919static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 920                         struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 921                         void *private)
 922{
 923        struct ea_set *es = private;
 924        unsigned int size;
 925        int stuffed;
 926        int error;
 927
 928        stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 929                               es->es_er->er_data_len, &size);
 930
 931        if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 932                if (GFS2_EA_REC_LEN(ea) < size)
 933                        return 0;
 934                if (!GFS2_EA_IS_STUFFED(ea)) {
 935                        error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 936                        if (error)
 937                                return error;
 938                }
 939                es->ea_split = 0;
 940        } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 941                es->ea_split = 1;
 942        else
 943                return 0;
 944
 945        if (stuffed) {
 946                error = ea_set_simple_noalloc(ip, bh, ea, es);
 947                if (error)
 948                        return error;
 949        } else {
 950                unsigned int blks;
 951
 952                es->es_bh = bh;
 953                es->es_ea = ea;
 954                blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 955                                        GFS2_SB(&ip->i_inode)->sd_jbsize);
 956
 957                error = ea_alloc_skeleton(ip, es->es_er, blks,
 958                                          ea_set_simple_alloc, es);
 959                if (error)
 960                        return error;
 961        }
 962
 963        return 1;
 964}
 965
 966static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 967                        void *private)
 968{
 969        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 970        struct buffer_head *indbh, *newbh;
 971        __be64 *eablk;
 972        int error;
 973        int mh_size = sizeof(struct gfs2_meta_header);
 974
 975        if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 976                __be64 *end;
 977
 978                error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 979                                       &indbh);
 980                if (error)
 981                        return error;
 982
 983                if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 984                        error = -EIO;
 985                        goto out;
 986                }
 987
 988                eablk = (__be64 *)(indbh->b_data + mh_size);
 989                end = eablk + sdp->sd_inptrs;
 990
 991                for (; eablk < end; eablk++)
 992                        if (!*eablk)
 993                                break;
 994
 995                if (eablk == end) {
 996                        error = -ENOSPC;
 997                        goto out;
 998                }
 999
1000                gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1001        } else {
1002                u64 blk;
1003                unsigned int n = 1;
1004                error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1005                if (error)
1006                        return error;
1007                gfs2_trans_add_unrevoke(sdp, blk, 1);
1008                indbh = gfs2_meta_new(ip->i_gl, blk);
1009                gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1010                gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1011                gfs2_buffer_clear_tail(indbh, mh_size);
1012
1013                eablk = (__be64 *)(indbh->b_data + mh_size);
1014                *eablk = cpu_to_be64(ip->i_eattr);
1015                ip->i_eattr = blk;
1016                ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1017                gfs2_add_inode_blocks(&ip->i_inode, 1);
1018
1019                eablk++;
1020        }
1021
1022        error = ea_alloc_blk(ip, &newbh);
1023        if (error)
1024                goto out;
1025
1026        *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1027        error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1028        brelse(newbh);
1029        if (error)
1030                goto out;
1031
1032        if (private)
1033                ea_set_remove_stuffed(ip, private);
1034
1035out:
1036        brelse(indbh);
1037        return error;
1038}
1039
1040static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1041                    const void *value, size_t size, struct gfs2_ea_location *el)
1042{
1043        struct gfs2_ea_request er;
1044        struct ea_set es;
1045        unsigned int blks = 2;
1046        int error;
1047
1048        er.er_type = type;
1049        er.er_name = name;
1050        er.er_data = (void *)value;
1051        er.er_name_len = strlen(name);
1052        er.er_data_len = size;
1053
1054        memset(&es, 0, sizeof(struct ea_set));
1055        es.es_er = &er;
1056        es.es_el = el;
1057
1058        error = ea_foreach(ip, ea_set_simple, &es);
1059        if (error > 0)
1060                return 0;
1061        if (error)
1062                return error;
1063
1064        if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1065                blks++;
1066        if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1067                blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1068
1069        return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1070}
1071
1072static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1073                                   struct gfs2_ea_location *el)
1074{
1075        if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1076                el->el_prev = GFS2_EA2NEXT(el->el_prev);
1077                gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1078                                     GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1079        }
1080
1081        return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1082}
1083
1084static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1085{
1086        struct gfs2_ea_header *ea = el->el_ea;
1087        struct gfs2_ea_header *prev = el->el_prev;
1088        struct buffer_head *dibh;
1089        int error;
1090
1091        error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1092        if (error)
1093                return error;
1094
1095        gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1096
1097        if (prev) {
1098                u32 len;
1099
1100                len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1101                prev->ea_rec_len = cpu_to_be32(len);
1102
1103                if (GFS2_EA_IS_LAST(ea))
1104                        prev->ea_flags |= GFS2_EAFLAG_LAST;
1105        } else {
1106                ea->ea_type = GFS2_EATYPE_UNUSED;
1107        }
1108
1109        error = gfs2_meta_inode_buffer(ip, &dibh);
1110        if (!error) {
1111                ip->i_inode.i_ctime = CURRENT_TIME;
1112                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1113                gfs2_dinode_out(ip, dibh->b_data);
1114                brelse(dibh);
1115        }
1116
1117        gfs2_trans_end(GFS2_SB(&ip->i_inode));
1118
1119        return error;
1120}
1121
1122/**
1123 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1124 * @ip: The inode
1125 * @type: The type of the extended attribute
1126 * @name: The name of the extended attribute
1127 *
1128 * This is not called directly by the VFS since we use the (common)
1129 * scheme of making a "set with NULL data" mean a remove request. Note
1130 * that this is different from a set with zero length data.
1131 *
1132 * Returns: 0, or errno on failure
1133 */
1134
1135static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1136{
1137        struct gfs2_ea_location el;
1138        int error;
1139
1140        if (!ip->i_eattr)
1141                return -ENODATA;
1142
1143        error = gfs2_ea_find(ip, type, name, &el);
1144        if (error)
1145                return error;
1146        if (!el.el_ea)
1147                return -ENODATA;
1148
1149        if (GFS2_EA_IS_STUFFED(el.el_ea))
1150                error = ea_remove_stuffed(ip, &el);
1151        else
1152                error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1153
1154        brelse(el.el_bh);
1155
1156        return error;
1157}
1158
1159/**
1160 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1161 * @ip: The inode
1162 * @name: The name of the extended attribute
1163 * @value: The value of the extended attribute (NULL for remove)
1164 * @size: The size of the @value argument
1165 * @flags: Create or Replace
1166 * @type: The type of the extended attribute
1167 *
1168 * See gfs2_xattr_remove() for details of the removal of xattrs.
1169 *
1170 * Returns: 0 or errno on failure
1171 */
1172
1173int __gfs2_xattr_set(struct inode *inode, const char *name,
1174                   const void *value, size_t size, int flags, int type)
1175{
1176        struct gfs2_inode *ip = GFS2_I(inode);
1177        struct gfs2_sbd *sdp = GFS2_SB(inode);
1178        struct gfs2_ea_location el;
1179        unsigned int namel = strlen(name);
1180        int error;
1181
1182        if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1183                return -EPERM;
1184        if (namel > GFS2_EA_MAX_NAME_LEN)
1185                return -ERANGE;
1186
1187        if (value == NULL)
1188                return gfs2_xattr_remove(ip, type, name);
1189
1190        if (ea_check_size(sdp, namel, size))
1191                return -ERANGE;
1192
1193        if (!ip->i_eattr) {
1194                if (flags & XATTR_REPLACE)
1195                        return -ENODATA;
1196                return ea_init(ip, type, name, value, size);
1197        }
1198
1199        error = gfs2_ea_find(ip, type, name, &el);
1200        if (error)
1201                return error;
1202
1203        if (el.el_ea) {
1204                if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1205                        brelse(el.el_bh);
1206                        return -EPERM;
1207                }
1208
1209                error = -EEXIST;
1210                if (!(flags & XATTR_CREATE)) {
1211                        int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1212                        error = ea_set_i(ip, type, name, value, size, &el);
1213                        if (!error && unstuffed)
1214                                ea_set_remove_unstuffed(ip, &el);
1215                }
1216
1217                brelse(el.el_bh);
1218                return error;
1219        }
1220
1221        error = -ENODATA;
1222        if (!(flags & XATTR_REPLACE))
1223                error = ea_set_i(ip, type, name, value, size, NULL);
1224
1225        return error;
1226}
1227
1228static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1229                const void *value, size_t size, int flags, int type)
1230{
1231        return __gfs2_xattr_set(dentry->d_inode, name, value,
1232                                size, flags, type);
1233}
1234
1235
1236static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1237                                  struct gfs2_ea_header *ea, char *data)
1238{
1239        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1240        unsigned int amount = GFS2_EA_DATA_LEN(ea);
1241        unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1242        int ret;
1243
1244        ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1245        if (ret)
1246                return ret;
1247
1248        ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1249        gfs2_trans_end(sdp);
1250
1251        return ret;
1252}
1253
1254int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1255{
1256        struct inode *inode = &ip->i_inode;
1257        struct gfs2_sbd *sdp = GFS2_SB(inode);
1258        struct gfs2_ea_location el;
1259        int error;
1260
1261        error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1262        if (error)
1263                return error;
1264
1265        if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1266                error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1267                if (error == 0) {
1268                        gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1269                        memcpy(GFS2_EA2DATA(el.el_ea), data,
1270                               GFS2_EA_DATA_LEN(el.el_ea));
1271                }
1272        } else {
1273                error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1274        }
1275
1276        brelse(el.el_bh);
1277        if (error)
1278                return error;
1279
1280        error = gfs2_setattr_simple(inode, attr);
1281        gfs2_trans_end(sdp);
1282        return error;
1283}
1284
1285static int ea_dealloc_indirect(struct gfs2_inode *ip)
1286{
1287        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1288        struct gfs2_rgrp_list rlist;
1289        struct buffer_head *indbh, *dibh;
1290        __be64 *eablk, *end;
1291        unsigned int rg_blocks = 0;
1292        u64 bstart = 0;
1293        unsigned int blen = 0;
1294        unsigned int blks = 0;
1295        unsigned int x;
1296        int error;
1297
1298        error = gfs2_rindex_update(sdp);
1299        if (error)
1300                return error;
1301
1302        memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1303
1304        error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1305        if (error)
1306                return error;
1307
1308        if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1309                error = -EIO;
1310                goto out;
1311        }
1312
1313        eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1314        end = eablk + sdp->sd_inptrs;
1315
1316        for (; eablk < end; eablk++) {
1317                u64 bn;
1318
1319                if (!*eablk)
1320                        break;
1321                bn = be64_to_cpu(*eablk);
1322
1323                if (bstart + blen == bn)
1324                        blen++;
1325                else {
1326                        if (bstart)
1327                                gfs2_rlist_add(ip, &rlist, bstart);
1328                        bstart = bn;
1329                        blen = 1;
1330                }
1331                blks++;
1332        }
1333        if (bstart)
1334                gfs2_rlist_add(ip, &rlist, bstart);
1335        else
1336                goto out;
1337
1338        gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1339
1340        for (x = 0; x < rlist.rl_rgrps; x++) {
1341                struct gfs2_rgrpd *rgd;
1342                rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1343                rg_blocks += rgd->rd_length;
1344        }
1345
1346        error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1347        if (error)
1348                goto out_rlist_free;
1349
1350        error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1351                                 RES_STATFS + RES_QUOTA, blks);
1352        if (error)
1353                goto out_gunlock;
1354
1355        gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1356
1357        eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1358        bstart = 0;
1359        blen = 0;
1360
1361        for (; eablk < end; eablk++) {
1362                u64 bn;
1363
1364                if (!*eablk)
1365                        break;
1366                bn = be64_to_cpu(*eablk);
1367
1368                if (bstart + blen == bn)
1369                        blen++;
1370                else {
1371                        if (bstart)
1372                                gfs2_free_meta(ip, bstart, blen);
1373                        bstart = bn;
1374                        blen = 1;
1375                }
1376
1377                *eablk = 0;
1378                gfs2_add_inode_blocks(&ip->i_inode, -1);
1379        }
1380        if (bstart)
1381                gfs2_free_meta(ip, bstart, blen);
1382
1383        ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1384
1385        error = gfs2_meta_inode_buffer(ip, &dibh);
1386        if (!error) {
1387                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1388                gfs2_dinode_out(ip, dibh->b_data);
1389                brelse(dibh);
1390        }
1391
1392        gfs2_trans_end(sdp);
1393
1394out_gunlock:
1395        gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1396out_rlist_free:
1397        gfs2_rlist_free(&rlist);
1398out:
1399        brelse(indbh);
1400        return error;
1401}
1402
1403static int ea_dealloc_block(struct gfs2_inode *ip)
1404{
1405        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1406        struct gfs2_rgrpd *rgd;
1407        struct buffer_head *dibh;
1408        struct gfs2_holder gh;
1409        int error;
1410
1411        error = gfs2_rindex_update(sdp);
1412        if (error)
1413                return error;
1414
1415        rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1416        if (!rgd) {
1417                gfs2_consist_inode(ip);
1418                return -EIO;
1419        }
1420
1421        error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1422        if (error)
1423                return error;
1424
1425        error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1426                                 RES_QUOTA, 1);
1427        if (error)
1428                goto out_gunlock;
1429
1430        gfs2_free_meta(ip, ip->i_eattr, 1);
1431
1432        ip->i_eattr = 0;
1433        gfs2_add_inode_blocks(&ip->i_inode, -1);
1434
1435        error = gfs2_meta_inode_buffer(ip, &dibh);
1436        if (!error) {
1437                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1438                gfs2_dinode_out(ip, dibh->b_data);
1439                brelse(dibh);
1440        }
1441
1442        gfs2_trans_end(sdp);
1443
1444out_gunlock:
1445        gfs2_glock_dq_uninit(&gh);
1446        return error;
1447}
1448
1449/**
1450 * gfs2_ea_dealloc - deallocate the extended attribute fork
1451 * @ip: the inode
1452 *
1453 * Returns: errno
1454 */
1455
1456int gfs2_ea_dealloc(struct gfs2_inode *ip)
1457{
1458        int error;
1459
1460        error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1461        if (error)
1462                return error;
1463
1464        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1465        if (error)
1466                return error;
1467
1468        error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1469        if (error)
1470                goto out_quota;
1471
1472        if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1473                error = ea_dealloc_indirect(ip);
1474                if (error)
1475                        goto out_quota;
1476        }
1477
1478        error = ea_dealloc_block(ip);
1479
1480out_quota:
1481        gfs2_quota_unhold(ip);
1482        return error;
1483}
1484
1485static const struct xattr_handler gfs2_xattr_user_handler = {
1486        .prefix = XATTR_USER_PREFIX,
1487        .flags  = GFS2_EATYPE_USR,
1488        .get    = gfs2_xattr_get,
1489        .set    = gfs2_xattr_set,
1490};
1491
1492static const struct xattr_handler gfs2_xattr_security_handler = {
1493        .prefix = XATTR_SECURITY_PREFIX,
1494        .flags  = GFS2_EATYPE_SECURITY,
1495        .get    = gfs2_xattr_get,
1496        .set    = gfs2_xattr_set,
1497};
1498
1499const struct xattr_handler *gfs2_xattr_handlers[] = {
1500        &gfs2_xattr_user_handler,
1501        &gfs2_xattr_security_handler,
1502        &gfs2_xattr_system_handler,
1503        NULL,
1504};
1505
1506
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