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_get_unstuffed - actually copies the unstuffed data into the
 452 *                    request buffer
 453 * @ip: The GFS2 inode
 454 * @ea: The extended attribute header structure
 455 * @data: The data to be copied
 456 *
 457 * Returns: errno
 458 */
 459
 460static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 461                            char *data)
 462{
 463        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 464        struct buffer_head **bh;
 465        unsigned int amount = GFS2_EA_DATA_LEN(ea);
 466        unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 467        __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 468        unsigned int x;
 469        int error = 0;
 470
 471        bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 472        if (!bh)
 473                return -ENOMEM;
 474
 475        for (x = 0; x < nptrs; x++) {
 476                error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 477                                       bh + x);
 478                if (error) {
 479                        while (x--)
 480                                brelse(bh[x]);
 481                        goto out;
 482                }
 483                dataptrs++;
 484        }
 485
 486        for (x = 0; x < nptrs; x++) {
 487                error = gfs2_meta_wait(sdp, bh[x]);
 488                if (error) {
 489                        for (; x < nptrs; x++)
 490                                brelse(bh[x]);
 491                        goto out;
 492                }
 493                if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 494                        for (; x < nptrs; x++)
 495                                brelse(bh[x]);
 496                        error = -EIO;
 497                        goto out;
 498                }
 499
 500                memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 501                       (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 502
 503                amount -= sdp->sd_jbsize;
 504                data += sdp->sd_jbsize;
 505
 506                brelse(bh[x]);
 507        }
 508
 509out:
 510        kfree(bh);
 511        return error;
 512}
 513
 514static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 515                            char *data, size_t size)
 516{
 517        int ret;
 518        size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 519        if (len > size)
 520                return -ERANGE;
 521
 522        if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 523                memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 524                return len;
 525        }
 526        ret = ea_get_unstuffed(ip, el->el_ea, data);
 527        if (ret < 0)
 528                return ret;
 529        return len;
 530}
 531
 532int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 533{
 534        struct gfs2_ea_location el;
 535        int error;
 536        int len;
 537        char *data;
 538
 539        error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 540        if (error)
 541                return error;
 542        if (!el.el_ea)
 543                goto out;
 544        if (!GFS2_EA_DATA_LEN(el.el_ea))
 545                goto out;
 546
 547        len = GFS2_EA_DATA_LEN(el.el_ea);
 548        data = kmalloc(len, GFP_NOFS);
 549        error = -ENOMEM;
 550        if (data == NULL)
 551                goto out;
 552
 553        error = gfs2_ea_get_copy(ip, &el, data, len);
 554        if (error < 0)
 555                kfree(data);
 556        else
 557                *ppdata = data;
 558out:
 559        brelse(el.el_bh);
 560        return error;
 561}
 562
 563/**
 564 * gfs2_xattr_get - Get a GFS2 extended attribute
 565 * @inode: The inode
 566 * @name: The name of the extended attribute
 567 * @buffer: The buffer to write the result into
 568 * @size: The size of the buffer
 569 * @type: The type of extended attribute
 570 *
 571 * Returns: actual size of data on success, -errno on error
 572 */
 573static int gfs2_xattr_get(struct dentry *dentry, const char *name,
 574                void *buffer, size_t size, int type)
 575{
 576        struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 577        struct gfs2_ea_location el;
 578        int error;
 579
 580        if (!ip->i_eattr)
 581                return -ENODATA;
 582        if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 583                return -EINVAL;
 584
 585        error = gfs2_ea_find(ip, type, name, &el);
 586        if (error)
 587                return error;
 588        if (!el.el_ea)
 589                return -ENODATA;
 590        if (size)
 591                error = gfs2_ea_get_copy(ip, &el, buffer, size);
 592        else
 593                error = GFS2_EA_DATA_LEN(el.el_ea);
 594        brelse(el.el_bh);
 595
 596        return error;
 597}
 598
 599/**
 600 * ea_alloc_blk - allocates a new block for extended attributes.
 601 * @ip: A pointer to the inode that's getting extended attributes
 602 * @bhp: Pointer to pointer to a struct buffer_head
 603 *
 604 * Returns: errno
 605 */
 606
 607static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 608{
 609        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 610        struct gfs2_ea_header *ea;
 611        unsigned int n = 1;
 612        u64 block;
 613        int error;
 614
 615        error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 616        if (error)
 617                return error;
 618        gfs2_trans_add_unrevoke(sdp, block, 1);
 619        *bhp = gfs2_meta_new(ip->i_gl, block);
 620        gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 621        gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 622        gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 623
 624        ea = GFS2_EA_BH2FIRST(*bhp);
 625        ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 626        ea->ea_type = GFS2_EATYPE_UNUSED;
 627        ea->ea_flags = GFS2_EAFLAG_LAST;
 628        ea->ea_num_ptrs = 0;
 629
 630        gfs2_add_inode_blocks(&ip->i_inode, 1);
 631
 632        return 0;
 633}
 634
 635/**
 636 * ea_write - writes the request info to an ea, creating new blocks if
 637 *            necessary
 638 * @ip: inode that is being modified
 639 * @ea: the location of the new ea in a block
 640 * @er: the write request
 641 *
 642 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 643 *
 644 * returns : errno
 645 */
 646
 647static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 648                    struct gfs2_ea_request *er)
 649{
 650        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 651        int error;
 652
 653        ea->ea_data_len = cpu_to_be32(er->er_data_len);
 654        ea->ea_name_len = er->er_name_len;
 655        ea->ea_type = er->er_type;
 656        ea->__pad = 0;
 657
 658        memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 659
 660        if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 661                ea->ea_num_ptrs = 0;
 662                memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 663        } else {
 664                __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 665                const char *data = er->er_data;
 666                unsigned int data_len = er->er_data_len;
 667                unsigned int copy;
 668                unsigned int x;
 669
 670                ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 671                for (x = 0; x < ea->ea_num_ptrs; x++) {
 672                        struct buffer_head *bh;
 673                        u64 block;
 674                        int mh_size = sizeof(struct gfs2_meta_header);
 675                        unsigned int n = 1;
 676
 677                        error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 678                        if (error)
 679                                return error;
 680                        gfs2_trans_add_unrevoke(sdp, block, 1);
 681                        bh = gfs2_meta_new(ip->i_gl, block);
 682                        gfs2_trans_add_bh(ip->i_gl, bh, 1);
 683                        gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 684
 685                        gfs2_add_inode_blocks(&ip->i_inode, 1);
 686
 687                        copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 688                                                           data_len;
 689                        memcpy(bh->b_data + mh_size, data, copy);
 690                        if (copy < sdp->sd_jbsize)
 691                                memset(bh->b_data + mh_size + copy, 0,
 692                                       sdp->sd_jbsize - copy);
 693
 694                        *dataptr++ = cpu_to_be64(bh->b_blocknr);
 695                        data += copy;
 696                        data_len -= copy;
 697
 698                        brelse(bh);
 699                }
 700
 701                gfs2_assert_withdraw(sdp, !data_len);
 702        }
 703
 704        return 0;
 705}
 706
 707typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 708                                   struct gfs2_ea_request *er, void *private);
 709
 710static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 711                             unsigned int blks,
 712                             ea_skeleton_call_t skeleton_call, void *private)
 713{
 714        struct buffer_head *dibh;
 715        int error;
 716
 717        error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 718        if (error)
 719                return error;
 720
 721        error = gfs2_quota_lock_check(ip);
 722        if (error)
 723                return error;
 724
 725        error = gfs2_inplace_reserve(ip, blks);
 726        if (error)
 727                goto out_gunlock_q;
 728
 729        error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 730                                 blks + gfs2_rg_blocks(ip) +
 731                                 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 732        if (error)
 733                goto out_ipres;
 734
 735        error = skeleton_call(ip, er, private);
 736        if (error)
 737                goto out_end_trans;
 738
 739        error = gfs2_meta_inode_buffer(ip, &dibh);
 740        if (!error) {
 741                ip->i_inode.i_ctime = CURRENT_TIME;
 742                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 743                gfs2_dinode_out(ip, dibh->b_data);
 744                brelse(dibh);
 745        }
 746
 747out_end_trans:
 748        gfs2_trans_end(GFS2_SB(&ip->i_inode));
 749out_ipres:
 750        gfs2_inplace_release(ip);
 751out_gunlock_q:
 752        gfs2_quota_unlock(ip);
 753        return error;
 754}
 755
 756static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 757                     void *private)
 758{
 759        struct buffer_head *bh;
 760        int error;
 761
 762        error = ea_alloc_blk(ip, &bh);
 763        if (error)
 764                return error;
 765
 766        ip->i_eattr = bh->b_blocknr;
 767        error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 768
 769        brelse(bh);
 770
 771        return error;
 772}
 773
 774/**
 775 * ea_init - initializes a new eattr block
 776 * @ip:
 777 * @er:
 778 *
 779 * Returns: errno
 780 */
 781
 782static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 783                   const void *data, size_t size)
 784{
 785        struct gfs2_ea_request er;
 786        unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 787        unsigned int blks = 1;
 788
 789        er.er_type = type;
 790        er.er_name = name;
 791        er.er_name_len = strlen(name);
 792        er.er_data = (void *)data;
 793        er.er_data_len = size;
 794
 795        if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 796                blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 797
 798        return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 799}
 800
 801static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 802{
 803        u32 ea_size = GFS2_EA_SIZE(ea);
 804        struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 805                                     ea_size);
 806        u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 807        int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 808
 809        ea->ea_rec_len = cpu_to_be32(ea_size);
 810        ea->ea_flags ^= last;
 811
 812        new->ea_rec_len = cpu_to_be32(new_size);
 813        new->ea_flags = last;
 814
 815        return new;
 816}
 817
 818static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 819                                  struct gfs2_ea_location *el)
 820{
 821        struct gfs2_ea_header *ea = el->el_ea;
 822        struct gfs2_ea_header *prev = el->el_prev;
 823        u32 len;
 824
 825        gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 826
 827        if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 828                ea->ea_type = GFS2_EATYPE_UNUSED;
 829                return;
 830        } else if (GFS2_EA2NEXT(prev) != ea) {
 831                prev = GFS2_EA2NEXT(prev);
 832                gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 833        }
 834
 835        len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 836        prev->ea_rec_len = cpu_to_be32(len);
 837
 838        if (GFS2_EA_IS_LAST(ea))
 839                prev->ea_flags |= GFS2_EAFLAG_LAST;
 840}
 841
 842struct ea_set {
 843        int ea_split;
 844
 845        struct gfs2_ea_request *es_er;
 846        struct gfs2_ea_location *es_el;
 847
 848        struct buffer_head *es_bh;
 849        struct gfs2_ea_header *es_ea;
 850};
 851
 852static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 853                                 struct gfs2_ea_header *ea, struct ea_set *es)
 854{
 855        struct gfs2_ea_request *er = es->es_er;
 856        struct buffer_head *dibh;
 857        int error;
 858
 859        error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 860        if (error)
 861                return error;
 862
 863        gfs2_trans_add_bh(ip->i_gl, bh, 1);
 864
 865        if (es->ea_split)
 866                ea = ea_split_ea(ea);
 867
 868        ea_write(ip, ea, er);
 869
 870        if (es->es_el)
 871                ea_set_remove_stuffed(ip, es->es_el);
 872
 873        error = gfs2_meta_inode_buffer(ip, &dibh);
 874        if (error)
 875                goto out;
 876        ip->i_inode.i_ctime = CURRENT_TIME;
 877        gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 878        gfs2_dinode_out(ip, dibh->b_data);
 879        brelse(dibh);
 880out:
 881        gfs2_trans_end(GFS2_SB(&ip->i_inode));
 882        return error;
 883}
 884
 885static int ea_set_simple_alloc(struct gfs2_inode *ip,
 886                               struct gfs2_ea_request *er, void *private)
 887{
 888        struct ea_set *es = private;
 889        struct gfs2_ea_header *ea = es->es_ea;
 890        int error;
 891
 892        gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 893
 894        if (es->ea_split)
 895                ea = ea_split_ea(ea);
 896
 897        error = ea_write(ip, ea, er);
 898        if (error)
 899                return error;
 900
 901        if (es->es_el)
 902                ea_set_remove_stuffed(ip, es->es_el);
 903
 904        return 0;
 905}
 906
 907static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 908                         struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 909                         void *private)
 910{
 911        struct ea_set *es = private;
 912        unsigned int size;
 913        int stuffed;
 914        int error;
 915
 916        stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 917                               es->es_er->er_data_len, &size);
 918
 919        if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 920                if (GFS2_EA_REC_LEN(ea) < size)
 921                        return 0;
 922                if (!GFS2_EA_IS_STUFFED(ea)) {
 923                        error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 924                        if (error)
 925                                return error;
 926                }
 927                es->ea_split = 0;
 928        } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 929                es->ea_split = 1;
 930        else
 931                return 0;
 932
 933        if (stuffed) {
 934                error = ea_set_simple_noalloc(ip, bh, ea, es);
 935                if (error)
 936                        return error;
 937        } else {
 938                unsigned int blks;
 939
 940                es->es_bh = bh;
 941                es->es_ea = ea;
 942                blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 943                                        GFS2_SB(&ip->i_inode)->sd_jbsize);
 944
 945                error = ea_alloc_skeleton(ip, es->es_er, blks,
 946                                          ea_set_simple_alloc, es);
 947                if (error)
 948                        return error;
 949        }
 950
 951        return 1;
 952}
 953
 954static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 955                        void *private)
 956{
 957        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 958        struct buffer_head *indbh, *newbh;
 959        __be64 *eablk;
 960        int error;
 961        int mh_size = sizeof(struct gfs2_meta_header);
 962
 963        if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 964                __be64 *end;
 965
 966                error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 967                                       &indbh);
 968                if (error)
 969                        return error;
 970
 971                if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 972                        error = -EIO;
 973                        goto out;
 974                }
 975
 976                eablk = (__be64 *)(indbh->b_data + mh_size);
 977                end = eablk + sdp->sd_inptrs;
 978
 979                for (; eablk < end; eablk++)
 980                        if (!*eablk)
 981                                break;
 982
 983                if (eablk == end) {
 984                        error = -ENOSPC;
 985                        goto out;
 986                }
 987
 988                gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 989        } else {
 990                u64 blk;
 991                unsigned int n = 1;
 992                error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
 993                if (error)
 994                        return error;
 995                gfs2_trans_add_unrevoke(sdp, blk, 1);
 996                indbh = gfs2_meta_new(ip->i_gl, blk);
 997                gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 998                gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
 999                gfs2_buffer_clear_tail(indbh, mh_size);
1000
1001                eablk = (__be64 *)(indbh->b_data + mh_size);
1002                *eablk = cpu_to_be64(ip->i_eattr);
1003                ip->i_eattr = blk;
1004                ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1005                gfs2_add_inode_blocks(&ip->i_inode, 1);
1006
1007                eablk++;
1008        }
1009
1010        error = ea_alloc_blk(ip, &newbh);
1011        if (error)
1012                goto out;
1013
1014        *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1015        error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1016        brelse(newbh);
1017        if (error)
1018                goto out;
1019
1020        if (private)
1021                ea_set_remove_stuffed(ip, private);
1022
1023out:
1024        brelse(indbh);
1025        return error;
1026}
1027
1028static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1029                    const void *value, size_t size, struct gfs2_ea_location *el)
1030{
1031        struct gfs2_ea_request er;
1032        struct ea_set es;
1033        unsigned int blks = 2;
1034        int error;
1035
1036        er.er_type = type;
1037        er.er_name = name;
1038        er.er_data = (void *)value;
1039        er.er_name_len = strlen(name);
1040        er.er_data_len = size;
1041
1042        memset(&es, 0, sizeof(struct ea_set));
1043        es.es_er = &er;
1044        es.es_el = el;
1045
1046        error = ea_foreach(ip, ea_set_simple, &es);
1047        if (error > 0)
1048                return 0;
1049        if (error)
1050                return error;
1051
1052        if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1053                blks++;
1054        if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1055                blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1056
1057        return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1058}
1059
1060static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1061                                   struct gfs2_ea_location *el)
1062{
1063        if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1064                el->el_prev = GFS2_EA2NEXT(el->el_prev);
1065                gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1066                                     GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1067        }
1068
1069        return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1070}
1071
1072static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1073{
1074        struct gfs2_ea_header *ea = el->el_ea;
1075        struct gfs2_ea_header *prev = el->el_prev;
1076        struct buffer_head *dibh;
1077        int error;
1078
1079        error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1080        if (error)
1081                return error;
1082
1083        gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1084
1085        if (prev) {
1086                u32 len;
1087
1088                len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1089                prev->ea_rec_len = cpu_to_be32(len);
1090
1091                if (GFS2_EA_IS_LAST(ea))
1092                        prev->ea_flags |= GFS2_EAFLAG_LAST;
1093        } else {
1094                ea->ea_type = GFS2_EATYPE_UNUSED;
1095        }
1096
1097        error = gfs2_meta_inode_buffer(ip, &dibh);
1098        if (!error) {
1099                ip->i_inode.i_ctime = CURRENT_TIME;
1100                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1101                gfs2_dinode_out(ip, dibh->b_data);
1102                brelse(dibh);
1103        }
1104
1105        gfs2_trans_end(GFS2_SB(&ip->i_inode));
1106
1107        return error;
1108}
1109
1110/**
1111 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1112 * @ip: The inode
1113 * @type: The type of the extended attribute
1114 * @name: The name of the extended attribute
1115 *
1116 * This is not called directly by the VFS since we use the (common)
1117 * scheme of making a "set with NULL data" mean a remove request. Note
1118 * that this is different from a set with zero length data.
1119 *
1120 * Returns: 0, or errno on failure
1121 */
1122
1123static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1124{
1125        struct gfs2_ea_location el;
1126        int error;
1127
1128        if (!ip->i_eattr)
1129                return -ENODATA;
1130
1131        error = gfs2_ea_find(ip, type, name, &el);
1132        if (error)
1133                return error;
1134        if (!el.el_ea)
1135                return -ENODATA;
1136
1137        if (GFS2_EA_IS_STUFFED(el.el_ea))
1138                error = ea_remove_stuffed(ip, &el);
1139        else
1140                error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1141
1142        brelse(el.el_bh);
1143
1144        return error;
1145}
1146
1147/**
1148 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1149 * @ip: The inode
1150 * @name: The name of the extended attribute
1151 * @value: The value of the extended attribute (NULL for remove)
1152 * @size: The size of the @value argument
1153 * @flags: Create or Replace
1154 * @type: The type of the extended attribute
1155 *
1156 * See gfs2_xattr_remove() for details of the removal of xattrs.
1157 *
1158 * Returns: 0 or errno on failure
1159 */
1160
1161int __gfs2_xattr_set(struct inode *inode, const char *name,
1162                   const void *value, size_t size, int flags, int type)
1163{
1164        struct gfs2_inode *ip = GFS2_I(inode);
1165        struct gfs2_sbd *sdp = GFS2_SB(inode);
1166        struct gfs2_ea_location el;
1167        unsigned int namel = strlen(name);
1168        int error;
1169
1170        if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1171                return -EPERM;
1172        if (namel > GFS2_EA_MAX_NAME_LEN)
1173                return -ERANGE;
1174
1175        if (value == NULL)
1176                return gfs2_xattr_remove(ip, type, name);
1177
1178        if (ea_check_size(sdp, namel, size))
1179                return -ERANGE;
1180
1181        if (!ip->i_eattr) {
1182                if (flags & XATTR_REPLACE)
1183                        return -ENODATA;
1184                return ea_init(ip, type, name, value, size);
1185        }
1186
1187        error = gfs2_ea_find(ip, type, name, &el);
1188        if (error)
1189                return error;
1190
1191        if (el.el_ea) {
1192                if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1193                        brelse(el.el_bh);
1194                        return -EPERM;
1195                }
1196
1197                error = -EEXIST;
1198                if (!(flags & XATTR_CREATE)) {
1199                        int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1200                        error = ea_set_i(ip, type, name, value, size, &el);
1201                        if (!error && unstuffed)
1202                                ea_set_remove_unstuffed(ip, &el);
1203                }
1204
1205                brelse(el.el_bh);
1206                return error;
1207        }
1208
1209        error = -ENODATA;
1210        if (!(flags & XATTR_REPLACE))
1211                error = ea_set_i(ip, type, name, value, size, NULL);
1212
1213        return error;
1214}
1215
1216static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1217                const void *value, size_t size, int flags, int type)
1218{
1219        return __gfs2_xattr_set(dentry->d_inode, name, value,
1220                                size, flags, type);
1221}
1222
1223static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1224                                  struct gfs2_ea_header *ea, char *data)
1225{
1226        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1227        struct buffer_head **bh;
1228        unsigned int amount = GFS2_EA_DATA_LEN(ea);
1229        unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1230        __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1231        unsigned int x;
1232        int error;
1233
1234        bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1235        if (!bh)
1236                return -ENOMEM;
1237
1238        error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1239        if (error)
1240                goto out;
1241
1242        for (x = 0; x < nptrs; x++) {
1243                error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1244                                       bh + x);
1245                if (error) {
1246                        while (x--)
1247                                brelse(bh[x]);
1248                        goto fail;
1249                }
1250                dataptrs++;
1251        }
1252
1253        for (x = 0; x < nptrs; x++) {
1254                error = gfs2_meta_wait(sdp, bh[x]);
1255                if (error) {
1256                        for (; x < nptrs; x++)
1257                                brelse(bh[x]);
1258                        goto fail;
1259                }
1260                if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1261                        for (; x < nptrs; x++)
1262                                brelse(bh[x]);
1263                        error = -EIO;
1264                        goto fail;
1265                }
1266
1267                gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1268
1269                memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1270                       (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1271
1272                amount -= sdp->sd_jbsize;
1273                data += sdp->sd_jbsize;
1274
1275                brelse(bh[x]);
1276        }
1277
1278out:
1279        kfree(bh);
1280        return error;
1281
1282fail:
1283        gfs2_trans_end(sdp);
1284        kfree(bh);
1285        return error;
1286}
1287
1288int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1289{
1290        struct inode *inode = &ip->i_inode;
1291        struct gfs2_sbd *sdp = GFS2_SB(inode);
1292        struct gfs2_ea_location el;
1293        int error;
1294
1295        error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1296        if (error)
1297                return error;
1298
1299        if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1300                error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1301                if (error == 0) {
1302                        gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1303                        memcpy(GFS2_EA2DATA(el.el_ea), data,
1304                               GFS2_EA_DATA_LEN(el.el_ea));
1305                }
1306        } else {
1307                error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1308        }
1309
1310        brelse(el.el_bh);
1311        if (error)
1312                return error;
1313
1314        error = gfs2_setattr_simple(inode, attr);
1315        gfs2_trans_end(sdp);
1316        return error;
1317}
1318
1319static int ea_dealloc_indirect(struct gfs2_inode *ip)
1320{
1321        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1322        struct gfs2_rgrp_list rlist;
1323        struct buffer_head *indbh, *dibh;
1324        __be64 *eablk, *end;
1325        unsigned int rg_blocks = 0;
1326        u64 bstart = 0;
1327        unsigned int blen = 0;
1328        unsigned int blks = 0;
1329        unsigned int x;
1330        int error;
1331
1332        error = gfs2_rindex_update(sdp);
1333        if (error)
1334                return error;
1335
1336        memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1337
1338        error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1339        if (error)
1340                return error;
1341
1342        if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1343                error = -EIO;
1344                goto out;
1345        }
1346
1347        eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1348        end = eablk + sdp->sd_inptrs;
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_rlist_add(ip, &rlist, bstart);
1362                        bstart = bn;
1363                        blen = 1;
1364                }
1365                blks++;
1366        }
1367        if (bstart)
1368                gfs2_rlist_add(ip, &rlist, bstart);
1369        else
1370                goto out;
1371
1372        gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1373
1374        for (x = 0; x < rlist.rl_rgrps; x++) {
1375                struct gfs2_rgrpd *rgd;
1376                rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1377                rg_blocks += rgd->rd_length;
1378        }
1379
1380        error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1381        if (error)
1382                goto out_rlist_free;
1383
1384        error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1385                                 RES_STATFS + RES_QUOTA, blks);
1386        if (error)
1387                goto out_gunlock;
1388
1389        gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1390
1391        eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1392        bstart = 0;
1393        blen = 0;
1394
1395        for (; eablk < end; eablk++) {
1396                u64 bn;
1397
1398                if (!*eablk)
1399                        break;
1400                bn = be64_to_cpu(*eablk);
1401
1402                if (bstart + blen == bn)
1403                        blen++;
1404                else {
1405                        if (bstart)
1406                                gfs2_free_meta(ip, bstart, blen);
1407                        bstart = bn;
1408                        blen = 1;
1409                }
1410
1411                *eablk = 0;
1412                gfs2_add_inode_blocks(&ip->i_inode, -1);
1413        }
1414        if (bstart)
1415                gfs2_free_meta(ip, bstart, blen);
1416
1417        ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1418
1419        error = gfs2_meta_inode_buffer(ip, &dibh);
1420        if (!error) {
1421                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1422                gfs2_dinode_out(ip, dibh->b_data);
1423                brelse(dibh);
1424        }
1425
1426        gfs2_trans_end(sdp);
1427
1428out_gunlock:
1429        gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1430out_rlist_free:
1431        gfs2_rlist_free(&rlist);
1432out:
1433        brelse(indbh);
1434        return error;
1435}
1436
1437static int ea_dealloc_block(struct gfs2_inode *ip)
1438{
1439        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1440        struct gfs2_rgrpd *rgd;
1441        struct buffer_head *dibh;
1442        struct gfs2_holder gh;
1443        int error;
1444
1445        error = gfs2_rindex_update(sdp);
1446        if (error)
1447                return error;
1448
1449        rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1450        if (!rgd) {
1451                gfs2_consist_inode(ip);
1452                return -EIO;
1453        }
1454
1455        error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1456        if (error)
1457                return error;
1458
1459        error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1460                                 RES_QUOTA, 1);
1461        if (error)
1462                goto out_gunlock;
1463
1464        gfs2_free_meta(ip, ip->i_eattr, 1);
1465
1466        ip->i_eattr = 0;
1467        gfs2_add_inode_blocks(&ip->i_inode, -1);
1468
1469        error = gfs2_meta_inode_buffer(ip, &dibh);
1470        if (!error) {
1471                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1472                gfs2_dinode_out(ip, dibh->b_data);
1473                brelse(dibh);
1474        }
1475
1476        gfs2_trans_end(sdp);
1477
1478out_gunlock:
1479        gfs2_glock_dq_uninit(&gh);
1480        return error;
1481}
1482
1483/**
1484 * gfs2_ea_dealloc - deallocate the extended attribute fork
1485 * @ip: the inode
1486 *
1487 * Returns: errno
1488 */
1489
1490int gfs2_ea_dealloc(struct gfs2_inode *ip)
1491{
1492        int error;
1493
1494        error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1495        if (error)
1496                return error;
1497
1498        error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1499        if (error)
1500                return error;
1501
1502        error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1503        if (error)
1504                goto out_quota;
1505
1506        if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1507                error = ea_dealloc_indirect(ip);
1508                if (error)
1509                        goto out_quota;
1510        }
1511
1512        error = ea_dealloc_block(ip);
1513
1514out_quota:
1515        gfs2_quota_unhold(ip);
1516        return error;
1517}
1518
1519static const struct xattr_handler gfs2_xattr_user_handler = {
1520        .prefix = XATTR_USER_PREFIX,
1521        .flags  = GFS2_EATYPE_USR,
1522        .get    = gfs2_xattr_get,
1523        .set    = gfs2_xattr_set,
1524};
1525
1526static const struct xattr_handler gfs2_xattr_security_handler = {
1527        .prefix = XATTR_SECURITY_PREFIX,
1528        .flags  = GFS2_EATYPE_SECURITY,
1529        .get    = gfs2_xattr_get,
1530        .set    = gfs2_xattr_set,
1531};
1532
1533const struct xattr_handler *gfs2_xattr_handlers[] = {
1534        &gfs2_xattr_user_handler,
1535        &gfs2_xattr_security_handler,
1536        &gfs2_xattr_system_handler,
1537        NULL,
1538};
1539
1540
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