fs/gfs2/eattr.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/xattr.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/lm_interface.h>
  17 #include <asm/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "acl.h"
  22 #include "eaops.h"
  23 #include "eattr.h"
  24 #include "glock.h"
  25 #include "inode.h"
  26 #include "meta_io.h"
  27 #include "quota.h"
  28 #include "rgrp.h"
  29 #include "trans.h"
  30 #include "util.h"
  31
  32 /**
  33  * ea_calc_size - returns the acutal number of bytes the request will take up
  34  *                (not counting any unstuffed data blocks)
  35  * @sdp:
  36  * @er:
  37  * @size:
  38  *
  39  * Returns: 1 if the EA should be stuffed
  40  */
  41
  42 static int ea_calc_size(struct gfs2_sbd *sdp, struct gfs2_ea_request *er,
  43                         unsigned int *size)
  44 {
  45         *size = GFS2_EAREQ_SIZE_STUFFED(er);
  46         if (*size <= sdp->sd_jbsize)
  47                 return 1;
  48
  49         *size = GFS2_EAREQ_SIZE_UNSTUFFED(sdp, er);
  50
  51         return 0;
  52 }
  53
  54 static int ea_check_size(struct gfs2_sbd *sdp, struct gfs2_ea_request *er)
  55 {
  56         unsigned int size;
  57
  58         if (er->er_data_len > GFS2_EA_MAX_DATA_LEN)
  59                 return -ERANGE;
  60
  61         ea_calc_size(sdp, er, &size);
  62
  63         /* This can only happen with 512 byte blocks */
  64         if (size > sdp->sd_jbsize)
  65                 return -ERANGE;
  66
  67         return 0;
  68 }
  69
  70 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  71                           struct gfs2_ea_header *ea,
  72                           struct gfs2_ea_header *prev, void *private);
  73
  74 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  75                         ea_call_t ea_call, void *data)
  76 {
  77         struct gfs2_ea_header *ea, *prev = NULL;
  78         int error = 0;
  79
  80         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  81                 return -EIO;
  82
  83         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  84                 if (!GFS2_EA_REC_LEN(ea))
  85                         goto fail;
  86                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  87                                                   bh->b_data + bh->b_size))
  88                         goto fail;
  89                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  90                         goto fail;
  91
  92                 error = ea_call(ip, bh, ea, prev, data);
  93                 if (error)
  94                         return error;
  95
  96                 if (GFS2_EA_IS_LAST(ea)) {
  97                         if ((char *)GFS2_EA2NEXT(ea) !=
  98                             bh->b_data + bh->b_size)
  99                                 goto fail;
 100                         break;
 101                 }
 102         }
 103
 104         return error;
 105
 106 fail:
 107         gfs2_consist_inode(ip);
 108         return -EIO;
 109 }
 110
 111 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 112 {
 113         struct buffer_head *bh, *eabh;
 114         __be64 *eablk, *end;
 115         int error;
 116
 117         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 118         if (error)
 119                 return error;
 120
 121         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 122                 error = ea_foreach_i(ip, bh, ea_call, data);
 123                 goto out;
 124         }
 125
 126         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 127                 error = -EIO;
 128                 goto out;
 129         }
 130
 131         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 132         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 133
 134         for (; eablk < end; eablk++) {
 135                 u64 bn;
 136
 137                 if (!*eablk)
 138                         break;
 139                 bn = be64_to_cpu(*eablk);
 140
 141                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 142                 if (error)
 143                         break;
 144                 error = ea_foreach_i(ip, eabh, ea_call, data);
 145                 brelse(eabh);
 146                 if (error)
 147                         break;
 148         }
 149 out:
 150         brelse(bh);
 151         return error;
 152 }
 153
 154 struct ea_find {
 155         struct gfs2_ea_request *ef_er;
 156         struct gfs2_ea_location *ef_el;
 157 };
 158
 159 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 160                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 161                      void *private)
 162 {
 163         struct ea_find *ef = private;
 164         struct gfs2_ea_request *er = ef->ef_er;
 165
 166         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 167                 return 0;
 168
 169         if (ea->ea_type == er->er_type) {
 170                 if (ea->ea_name_len == er->er_name_len &&
 171                     !memcmp(GFS2_EA2NAME(ea), er->er_name, ea->ea_name_len)) {
 172                         struct gfs2_ea_location *el = ef->ef_el;
 173                         get_bh(bh);
 174                         el->el_bh = bh;
 175                         el->el_ea = ea;
 176                         el->el_prev = prev;
 177                         return 1;
 178                 }
 179         }
 180
 181         return 0;
 182 }
 183
 184 int gfs2_ea_find(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 185                  struct gfs2_ea_location *el)
 186 {
 187         struct ea_find ef;
 188         int error;
 189
 190         ef.ef_er = er;
 191         ef.ef_el = el;
 192
 193         memset(el, 0, sizeof(struct gfs2_ea_location));
 194
 195         error = ea_foreach(ip, ea_find_i, &ef);
 196         if (error > 0)
 197                 return 0;
 198
 199         return error;
 200 }
 201
 202 /**
 203  * ea_dealloc_unstuffed -
 204  * @ip:
 205  * @bh:
 206  * @ea:
 207  * @prev:
 208  * @private:
 209  *
 210  * Take advantage of the fact that all unstuffed blocks are
 211  * allocated from the same RG.  But watch, this may not always
 212  * be true.
 213  *
 214  * Returns: errno
 215  */
 216
 217 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 218                                 struct gfs2_ea_header *ea,
 219                                 struct gfs2_ea_header *prev, void *private)
 220 {
 221         int *leave = private;
 222         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 223         struct gfs2_rgrpd *rgd;
 224         struct gfs2_holder rg_gh;
 225         struct buffer_head *dibh;
 226         __be64 *dataptrs;
 227         u64 bn = 0;
 228         u64 bstart = 0;
 229         unsigned int blen = 0;
 230         unsigned int blks = 0;
 231         unsigned int x;
 232         int error;
 233
 234         if (GFS2_EA_IS_STUFFED(ea))
 235                 return 0;
 236
 237         dataptrs = GFS2_EA2DATAPTRS(ea);
 238         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 239                 if (*dataptrs) {
 240                         blks++;
 241                         bn = be64_to_cpu(*dataptrs);
 242                 }
 243         }
 244         if (!blks)
 245                 return 0;
 246
 247         rgd = gfs2_blk2rgrpd(sdp, bn);
 248         if (!rgd) {
 249                 gfs2_consist_inode(ip);
 250                 return -EIO;
 251         }
 252
 253         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 254         if (error)
 255                 return error;
 256
 257         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 258                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 259         if (error)
 260                 goto out_gunlock;
 261
 262         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 263
 264         dataptrs = GFS2_EA2DATAPTRS(ea);
 265         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 266                 if (!*dataptrs)
 267                         break;
 268                 bn = be64_to_cpu(*dataptrs);
 269
 270                 if (bstart + blen == bn)
 271                         blen++;
 272                 else {
 273                         if (bstart)
 274                                 gfs2_free_meta(ip, bstart, blen);
 275                         bstart = bn;
 276                         blen = 1;
 277                 }
 278
 279                 *dataptrs = 0;
 280                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 281         }
 282         if (bstart)
 283                 gfs2_free_meta(ip, bstart, blen);
 284
 285         if (prev && !leave) {
 286                 u32 len;
 287
 288                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 289                 prev->ea_rec_len = cpu_to_be32(len);
 290
 291                 if (GFS2_EA_IS_LAST(ea))
 292                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 293         } else {
 294                 ea->ea_type = GFS2_EATYPE_UNUSED;
 295                 ea->ea_num_ptrs = 0;
 296         }
 297
 298         error = gfs2_meta_inode_buffer(ip, &dibh);
 299         if (!error) {
 300                 ip->i_inode.i_ctime = CURRENT_TIME;
 301                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 302                 gfs2_dinode_out(ip, dibh->b_data);
 303                 brelse(dibh);
 304         }
 305
 306         gfs2_trans_end(sdp);
 307
 308 out_gunlock:
 309         gfs2_glock_dq_uninit(&rg_gh);
 310         return error;
 311 }
 312
 313 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 314                                struct gfs2_ea_header *ea,
 315                                struct gfs2_ea_header *prev, int leave)
 316 {
 317         struct gfs2_alloc *al;
 318         int error;
 319
 320         al = gfs2_alloc_get(ip);
 321         if (!al)
 322                 return -ENOMEM;
 323
 324         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 325         if (error)
 326                 goto out_alloc;
 327
 328         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
 329         if (error)
 330                 goto out_quota;
 331
 332         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 333
 334         gfs2_glock_dq_uninit(&al->al_ri_gh);
 335
 336 out_quota:
 337         gfs2_quota_unhold(ip);
 338 out_alloc:
 339         gfs2_alloc_put(ip);
 340         return error;
 341 }
 342
 343 struct ea_list {
 344         struct gfs2_ea_request *ei_er;
 345         unsigned int ei_size;
 346 };
 347
 348 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 349                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 350                      void *private)
 351 {
 352         struct ea_list *ei = private;
 353         struct gfs2_ea_request *er = ei->ei_er;
 354         unsigned int ea_size = gfs2_ea_strlen(ea);
 355
 356         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 357                 return 0;
 358
 359         if (er->er_data_len) {
 360                 char *prefix = NULL;
 361                 unsigned int l = 0;
 362                 char c = 0;
 363
 364                 if (ei->ei_size + ea_size > er->er_data_len)
 365                         return -ERANGE;
 366
 367                 switch (ea->ea_type) {
 368                 case GFS2_EATYPE_USR:
 369                         prefix = "user.";
 370                         l = 5;
 371                         break;
 372                 case GFS2_EATYPE_SYS:
 373                         prefix = "system.";
 374                         l = 7;
 375                         break;
 376                 case GFS2_EATYPE_SECURITY:
 377                         prefix = "security.";
 378                         l = 9;
 379                         break;
 380                 }
 381
 382                 BUG_ON(l == 0);
 383
 384                 memcpy(er->er_data + ei->ei_size, prefix, l);
 385                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 386                        ea->ea_name_len);
 387                 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 388         }
 389
 390         ei->ei_size += ea_size;
 391
 392         return 0;
 393 }
 394
 395 /**
 396  * gfs2_ea_list -
 397  * @ip:
 398  * @er:
 399  *
 400  * Returns: actual size of data on success, -errno on error
 401  */
 402
 403 int gfs2_ea_list(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 404 {
 405         struct gfs2_holder i_gh;
 406         int error;
 407
 408         if (!er->er_data || !er->er_data_len) {
 409                 er->er_data = NULL;
 410                 er->er_data_len = 0;
 411         }
 412
 413         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 414         if (error)
 415                 return error;
 416
 417         if (ip->i_eattr) {
 418                 struct ea_list ei = { .ei_er = er, .ei_size = 0 };
 419
 420                 error = ea_foreach(ip, ea_list_i, &ei);
 421                 if (!error)
 422                         error = ei.ei_size;
 423         }
 424
 425         gfs2_glock_dq_uninit(&i_gh);
 426
 427         return error;
 428 }
 429
 430 /**
 431  * ea_get_unstuffed - actually copies the unstuffed data into the
 432  *                    request buffer
 433  * @ip: The GFS2 inode
 434  * @ea: The extended attribute header structure
 435  * @data: The data to be copied
 436  *
 437  * Returns: errno
 438  */
 439
 440 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 441                             char *data)
 442 {
 443         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 444         struct buffer_head **bh;
 445         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 446         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 447         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 448         unsigned int x;
 449         int error = 0;
 450
 451         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 452         if (!bh)
 453                 return -ENOMEM;
 454
 455         for (x = 0; x < nptrs; x++) {
 456                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
 457                                        bh + x);
 458                 if (error) {
 459                         while (x--)
 460                                 brelse(bh[x]);
 461                         goto out;
 462                 }
 463                 dataptrs++;
 464         }
 465
 466         for (x = 0; x < nptrs; x++) {
 467                 error = gfs2_meta_wait(sdp, bh[x]);
 468                 if (error) {
 469                         for (; x < nptrs; x++)
 470                                 brelse(bh[x]);
 471                         goto out;
 472                 }
 473                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 474                         for (; x < nptrs; x++)
 475                                 brelse(bh[x]);
 476                         error = -EIO;
 477                         goto out;
 478                 }
 479
 480                 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
 481                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
 482
 483                 amount -= sdp->sd_jbsize;
 484                 data += sdp->sd_jbsize;
 485
 486                 brelse(bh[x]);
 487         }
 488
 489 out:
 490         kfree(bh);
 491         return error;
 492 }
 493
 494 int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 495                      char *data)
 496 {
 497         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 498                 memcpy(data, GFS2_EA2DATA(el->el_ea), GFS2_EA_DATA_LEN(el->el_ea));
 499                 return 0;
 500         } else
 501                 return ea_get_unstuffed(ip, el->el_ea, data);
 502 }
 503
 504 /**
 505  * gfs2_ea_get_i -
 506  * @ip: The GFS2 inode
 507  * @er: The request structure
 508  *
 509  * Returns: actual size of data on success, -errno on error
 510  */
 511
 512 int gfs2_ea_get_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 513 {
 514         struct gfs2_ea_location el;
 515         int error;
 516
 517         if (!ip->i_eattr)
 518                 return -ENODATA;
 519
 520         error = gfs2_ea_find(ip, er, &el);
 521         if (error)
 522                 return error;
 523         if (!el.el_ea)
 524                 return -ENODATA;
 525
 526         if (er->er_data_len) {
 527                 if (GFS2_EA_DATA_LEN(el.el_ea) > er->er_data_len)
 528                         error =  -ERANGE;
 529                 else
 530                         error = gfs2_ea_get_copy(ip, &el, er->er_data);
 531         }
 532         if (!error)
 533                 error = GFS2_EA_DATA_LEN(el.el_ea);
 534
 535         brelse(el.el_bh);
 536
 537         return error;
 538 }
 539
 540 /**
 541  * gfs2_ea_get -
 542  * @ip: The GFS2 inode
 543  * @er: The request structure
 544  *
 545  * Returns: actual size of data on success, -errno on error
 546  */
 547
 548 int gfs2_ea_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 549 {
 550         struct gfs2_holder i_gh;
 551         int error;
 552
 553         if (!er->er_name_len ||
 554             er->er_name_len > GFS2_EA_MAX_NAME_LEN)
 555                 return -EINVAL;
 556         if (!er->er_data || !er->er_data_len) {
 557                 er->er_data = NULL;
 558                 er->er_data_len = 0;
 559         }
 560
 561         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 562         if (error)
 563                 return error;
 564
 565         error = gfs2_ea_ops[er->er_type]->eo_get(ip, er);
 566
 567         gfs2_glock_dq_uninit(&i_gh);
 568
 569         return error;
 570 }
 571
 572 /**
 573  * ea_alloc_blk - allocates a new block for extended attributes.
 574  * @ip: A pointer to the inode that's getting extended attributes
 575  * @bhp: Pointer to pointer to a struct buffer_head
 576  *
 577  * Returns: errno
 578  */
 579
 580 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 581 {
 582         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 583         struct gfs2_ea_header *ea;
 584         unsigned int n = 1;
 585         u64 block;
 586
 587         block = gfs2_alloc_block(ip, &n);
 588         gfs2_trans_add_unrevoke(sdp, block, 1);
 589         *bhp = gfs2_meta_new(ip->i_gl, block);
 590         gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 591         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 592         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 593
 594         ea = GFS2_EA_BH2FIRST(*bhp);
 595         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 596         ea->ea_type = GFS2_EATYPE_UNUSED;
 597         ea->ea_flags = GFS2_EAFLAG_LAST;
 598         ea->ea_num_ptrs = 0;
 599
 600         gfs2_add_inode_blocks(&ip->i_inode, 1);
 601
 602         return 0;
 603 }
 604
 605 /**
 606  * ea_write - writes the request info to an ea, creating new blocks if
 607  *            necessary
 608  * @ip: inode that is being modified
 609  * @ea: the location of the new ea in a block
 610  * @er: the write request
 611  *
 612  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 613  *
 614  * returns : errno
 615  */
 616
 617 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 618                     struct gfs2_ea_request *er)
 619 {
 620         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 621
 622         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 623         ea->ea_name_len = er->er_name_len;
 624         ea->ea_type = er->er_type;
 625         ea->__pad = 0;
 626
 627         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 628
 629         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 630                 ea->ea_num_ptrs = 0;
 631                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 632         } else {
 633                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 634                 const char *data = er->er_data;
 635                 unsigned int data_len = er->er_data_len;
 636                 unsigned int copy;
 637                 unsigned int x;
 638
 639                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 640                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 641                         struct buffer_head *bh;
 642                         u64 block;
 643                         int mh_size = sizeof(struct gfs2_meta_header);
 644                         unsigned int n = 1;
 645
 646                         block = gfs2_alloc_block(ip, &n);
 647                         gfs2_trans_add_unrevoke(sdp, block, 1);
 648                         bh = gfs2_meta_new(ip->i_gl, block);
 649                         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 650                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 651
 652                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 653
 654                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 655                                                            data_len;
 656                         memcpy(bh->b_data + mh_size, data, copy);
 657                         if (copy < sdp->sd_jbsize)
 658                                 memset(bh->b_data + mh_size + copy, 0,
 659                                        sdp->sd_jbsize - copy);
 660
 661                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 662                         data += copy;
 663                         data_len -= copy;
 664
 665                         brelse(bh);
 666                 }
 667
 668                 gfs2_assert_withdraw(sdp, !data_len);
 669         }
 670
 671         return 0;
 672 }
 673
 674 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 675                                    struct gfs2_ea_request *er, void *private);
 676
 677 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 678                              unsigned int blks,
 679                              ea_skeleton_call_t skeleton_call, void *private)
 680 {
 681         struct gfs2_alloc *al;
 682         struct buffer_head *dibh;
 683         int error;
 684
 685         al = gfs2_alloc_get(ip);
 686         if (!al)
 687                 return -ENOMEM;
 688
 689         error = gfs2_quota_lock_check(ip);
 690         if (error)
 691                 goto out;
 692
 693         al->al_requested = blks;
 694
 695         error = gfs2_inplace_reserve(ip);
 696         if (error)
 697                 goto out_gunlock_q;
 698
 699         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 700                                  blks + al->al_rgd->rd_length +
 701                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 702         if (error)
 703                 goto out_ipres;
 704
 705         error = skeleton_call(ip, er, private);
 706         if (error)
 707                 goto out_end_trans;
 708
 709         error = gfs2_meta_inode_buffer(ip, &dibh);
 710         if (!error) {
 711                 if (er->er_flags & GFS2_ERF_MODE) {
 712                         gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 713                                             (ip->i_inode.i_mode & S_IFMT) ==
 714                                             (er->er_mode & S_IFMT));
 715                         ip->i_inode.i_mode = er->er_mode;
 716                 }
 717                 ip->i_inode.i_ctime = CURRENT_TIME;
 718                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 719                 gfs2_dinode_out(ip, dibh->b_data);
 720                 brelse(dibh);
 721         }
 722
 723 out_end_trans:
 724         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 725 out_ipres:
 726         gfs2_inplace_release(ip);
 727 out_gunlock_q:
 728         gfs2_quota_unlock(ip);
 729 out:
 730         gfs2_alloc_put(ip);
 731         return error;
 732 }
 733
 734 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 735                      void *private)
 736 {
 737         struct buffer_head *bh;
 738         int error;
 739
 740         error = ea_alloc_blk(ip, &bh);
 741         if (error)
 742                 return error;
 743
 744         ip->i_eattr = bh->b_blocknr;
 745         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 746
 747         brelse(bh);
 748
 749         return error;
 750 }
 751
 752 /**
 753  * ea_init - initializes a new eattr block
 754  * @ip:
 755  * @er:
 756  *
 757  * Returns: errno
 758  */
 759
 760 static int ea_init(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 761 {
 762         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 763         unsigned int blks = 1;
 764
 765         if (GFS2_EAREQ_SIZE_STUFFED(er) > jbsize)
 766                 blks += DIV_ROUND_UP(er->er_data_len, jbsize);
 767
 768         return ea_alloc_skeleton(ip, er, blks, ea_init_i, NULL);
 769 }
 770
 771 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 772 {
 773         u32 ea_size = GFS2_EA_SIZE(ea);
 774         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 775                                      ea_size);
 776         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 777         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 778
 779         ea->ea_rec_len = cpu_to_be32(ea_size);
 780         ea->ea_flags ^= last;
 781
 782         new->ea_rec_len = cpu_to_be32(new_size);
 783         new->ea_flags = last;
 784
 785         return new;
 786 }
 787
 788 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 789                                   struct gfs2_ea_location *el)
 790 {
 791         struct gfs2_ea_header *ea = el->el_ea;
 792         struct gfs2_ea_header *prev = el->el_prev;
 793         u32 len;
 794
 795         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 796
 797         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 798                 ea->ea_type = GFS2_EATYPE_UNUSED;
 799                 return;
 800         } else if (GFS2_EA2NEXT(prev) != ea) {
 801                 prev = GFS2_EA2NEXT(prev);
 802                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 803         }
 804
 805         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 806         prev->ea_rec_len = cpu_to_be32(len);
 807
 808         if (GFS2_EA_IS_LAST(ea))
 809                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 810 }
 811
 812 struct ea_set {
 813         int ea_split;
 814
 815         struct gfs2_ea_request *es_er;
 816         struct gfs2_ea_location *es_el;
 817
 818         struct buffer_head *es_bh;
 819         struct gfs2_ea_header *es_ea;
 820 };
 821
 822 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 823                                  struct gfs2_ea_header *ea, struct ea_set *es)
 824 {
 825         struct gfs2_ea_request *er = es->es_er;
 826         struct buffer_head *dibh;
 827         int error;
 828
 829         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 830         if (error)
 831                 return error;
 832
 833         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 834
 835         if (es->ea_split)
 836                 ea = ea_split_ea(ea);
 837
 838         ea_write(ip, ea, er);
 839
 840         if (es->es_el)
 841                 ea_set_remove_stuffed(ip, es->es_el);
 842
 843         error = gfs2_meta_inode_buffer(ip, &dibh);
 844         if (error)
 845                 goto out;
 846
 847         if (er->er_flags & GFS2_ERF_MODE) {
 848                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
 849                         (ip->i_inode.i_mode & S_IFMT) == (er->er_mode & S_IFMT));
 850                 ip->i_inode.i_mode = er->er_mode;
 851         }
 852         ip->i_inode.i_ctime = CURRENT_TIME;
 853         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 854         gfs2_dinode_out(ip, dibh->b_data);
 855         brelse(dibh);
 856 out:
 857         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 858         return error;
 859 }
 860
 861 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 862                                struct gfs2_ea_request *er, void *private)
 863 {
 864         struct ea_set *es = private;
 865         struct gfs2_ea_header *ea = es->es_ea;
 866         int error;
 867
 868         gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 869
 870         if (es->ea_split)
 871                 ea = ea_split_ea(ea);
 872
 873         error = ea_write(ip, ea, er);
 874         if (error)
 875                 return error;
 876
 877         if (es->es_el)
 878                 ea_set_remove_stuffed(ip, es->es_el);
 879
 880         return 0;
 881 }
 882
 883 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 884                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 885                          void *private)
 886 {
 887         struct ea_set *es = private;
 888         unsigned int size;
 889         int stuffed;
 890         int error;
 891
 892         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er, &size);
 893
 894         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 895                 if (GFS2_EA_REC_LEN(ea) < size)
 896                         return 0;
 897                 if (!GFS2_EA_IS_STUFFED(ea)) {
 898                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 899                         if (error)
 900                                 return error;
 901                 }
 902                 es->ea_split = 0;
 903         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 904                 es->ea_split = 1;
 905         else
 906                 return 0;
 907
 908         if (stuffed) {
 909                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 910                 if (error)
 911                         return error;
 912         } else {
 913                 unsigned int blks;
 914
 915                 es->es_bh = bh;
 916                 es->es_ea = ea;
 917                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 918                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 919
 920                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 921                                           ea_set_simple_alloc, es);
 922                 if (error)
 923                         return error;
 924         }
 925
 926         return 1;
 927 }
 928
 929 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 930                         void *private)
 931 {
 932         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 933         struct buffer_head *indbh, *newbh;
 934         __be64 *eablk;
 935         int error;
 936         int mh_size = sizeof(struct gfs2_meta_header);
 937
 938         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 939                 __be64 *end;
 940
 941                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 942                                        &indbh);
 943                 if (error)
 944                         return error;
 945
 946                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 947                         error = -EIO;
 948                         goto out;
 949                 }
 950
 951                 eablk = (__be64 *)(indbh->b_data + mh_size);
 952                 end = eablk + sdp->sd_inptrs;
 953
 954                 for (; eablk < end; eablk++)
 955                         if (!*eablk)
 956                                 break;
 957
 958                 if (eablk == end) {
 959                         error = -ENOSPC;
 960                         goto out;
 961                 }
 962
 963                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 964         } else {
 965                 u64 blk;
 966                 unsigned int n = 1;
 967                 blk = gfs2_alloc_block(ip, &n);
 968                 gfs2_trans_add_unrevoke(sdp, blk, 1);
 969                 indbh = gfs2_meta_new(ip->i_gl, blk);
 970                 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 971                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
 972                 gfs2_buffer_clear_tail(indbh, mh_size);
 973
 974                 eablk = (__be64 *)(indbh->b_data + mh_size);
 975                 *eablk = cpu_to_be64(ip->i_eattr);
 976                 ip->i_eattr = blk;
 977                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
 978                 gfs2_add_inode_blocks(&ip->i_inode, 1);
 979
 980                 eablk++;
 981         }
 982
 983         error = ea_alloc_blk(ip, &newbh);
 984         if (error)
 985                 goto out;
 986
 987         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
 988         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
 989         brelse(newbh);
 990         if (error)
 991                 goto out;
 992
 993         if (private)
 994                 ea_set_remove_stuffed(ip, private);
 995
 996 out:
 997         brelse(indbh);
 998         return error;
 999 }
1000
1001 static int ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
1002                     struct gfs2_ea_location *el)
1003 {
1004         struct ea_set es;
1005         unsigned int blks = 2;
1006         int error;
1007
1008         memset(&es, 0, sizeof(struct ea_set));
1009         es.es_er = er;
1010         es.es_el = el;
1011
1012         error = ea_foreach(ip, ea_set_simple, &es);
1013         if (error > 0)
1014                 return 0;
1015         if (error)
1016                 return error;
1017
1018         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1019                 blks++;
1020         if (GFS2_EAREQ_SIZE_STUFFED(er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1021                 blks += DIV_ROUND_UP(er->er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1022
1023         return ea_alloc_skeleton(ip, er, blks, ea_set_block, el);
1024 }
1025
1026 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1027                                    struct gfs2_ea_location *el)
1028 {
1029         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1030                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1031                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1032                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1033         }
1034
1035         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev,0);
1036 }
1037
1038 int gfs2_ea_set_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1039 {
1040         struct gfs2_ea_location el;
1041         int error;
1042
1043         if (!ip->i_eattr) {
1044                 if (er->er_flags & XATTR_REPLACE)
1045                         return -ENODATA;
1046                 return ea_init(ip, er);
1047         }
1048
1049         error = gfs2_ea_find(ip, er, &el);
1050         if (error)
1051                 return error;
1052
1053         if (el.el_ea) {
1054                 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1055                         brelse(el.el_bh);
1056                         return -EPERM;
1057                 }
1058
1059                 error = -EEXIST;
1060                 if (!(er->er_flags & XATTR_CREATE)) {
1061                         int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1062                         error = ea_set_i(ip, er, &el);
1063                         if (!error && unstuffed)
1064                                 ea_set_remove_unstuffed(ip, &el);
1065                 }
1066
1067                 brelse(el.el_bh);
1068         } else {
1069                 error = -ENODATA;
1070                 if (!(er->er_flags & XATTR_REPLACE))
1071                         error = ea_set_i(ip, er, NULL);
1072         }
1073
1074         return error;
1075 }
1076
1077 int gfs2_ea_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1078 {
1079         struct gfs2_holder i_gh;
1080         int error;
1081
1082         if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1083                 return -EINVAL;
1084         if (!er->er_data || !er->er_data_len) {
1085                 er->er_data = NULL;
1086                 er->er_data_len = 0;
1087         }
1088         error = ea_check_size(GFS2_SB(&ip->i_inode), er);
1089         if (error)
1090                 return error;
1091
1092         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1093         if (error)
1094                 return error;
1095
1096         if (IS_IMMUTABLE(&ip->i_inode))
1097                 error = -EPERM;
1098         else
1099                 error = gfs2_ea_ops[er->er_type]->eo_set(ip, er);
1100
1101         gfs2_glock_dq_uninit(&i_gh);
1102
1103         return error;
1104 }
1105
1106 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1107 {
1108         struct gfs2_ea_header *ea = el->el_ea;
1109         struct gfs2_ea_header *prev = el->el_prev;
1110         struct buffer_head *dibh;
1111         int error;
1112
1113         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1114         if (error)
1115                 return error;
1116
1117         gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1118
1119         if (prev) {
1120                 u32 len;
1121
1122                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1123                 prev->ea_rec_len = cpu_to_be32(len);
1124
1125                 if (GFS2_EA_IS_LAST(ea))
1126                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1127         } else
1128                 ea->ea_type = GFS2_EATYPE_UNUSED;
1129
1130         error = gfs2_meta_inode_buffer(ip, &dibh);
1131         if (!error) {
1132                 ip->i_inode.i_ctime = CURRENT_TIME;
1133                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1134                 gfs2_dinode_out(ip, dibh->b_data);
1135                 brelse(dibh);
1136         }
1137
1138         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1139
1140         return error;
1141 }
1142
1143 int gfs2_ea_remove_i(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1144 {
1145         struct gfs2_ea_location el;
1146         int error;
1147
1148         if (!ip->i_eattr)
1149                 return -ENODATA;
1150
1151         error = gfs2_ea_find(ip, er, &el);
1152         if (error)
1153                 return error;
1154         if (!el.el_ea)
1155                 return -ENODATA;
1156
1157         if (GFS2_EA_IS_STUFFED(el.el_ea))
1158                 error = ea_remove_stuffed(ip, &el);
1159         else
1160                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev,
1161                                             0);
1162
1163         brelse(el.el_bh);
1164
1165         return error;
1166 }
1167
1168 /**
1169  * gfs2_ea_remove - sets (or creates or replaces) an extended attribute
1170  * @ip: pointer to the inode of the target file
1171  * @er: request information
1172  *
1173  * Returns: errno
1174  */
1175
1176 int gfs2_ea_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
1177 {
1178         struct gfs2_holder i_gh;
1179         int error;
1180
1181         if (!er->er_name_len || er->er_name_len > GFS2_EA_MAX_NAME_LEN)
1182                 return -EINVAL;
1183
1184         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1185         if (error)
1186                 return error;
1187
1188         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1189                 error = -EPERM;
1190         else
1191                 error = gfs2_ea_ops[er->er_type]->eo_remove(ip, er);
1192
1193         gfs2_glock_dq_uninit(&i_gh);
1194
1195         return error;
1196 }
1197
1198 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1199                                   struct gfs2_ea_header *ea, char *data)
1200 {
1201         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1202         struct buffer_head **bh;
1203         unsigned int amount = GFS2_EA_DATA_LEN(ea);
1204         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1205         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1206         unsigned int x;
1207         int error;
1208
1209         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1210         if (!bh)
1211                 return -ENOMEM;
1212
1213         error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1214         if (error)
1215                 goto out;
1216
1217         for (x = 0; x < nptrs; x++) {
1218                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1219                                        bh + x);
1220                 if (error) {
1221                         while (x--)
1222                                 brelse(bh[x]);
1223                         goto fail;
1224                 }
1225                 dataptrs++;
1226         }
1227
1228         for (x = 0; x < nptrs; x++) {
1229                 error = gfs2_meta_wait(sdp, bh[x]);
1230                 if (error) {
1231                         for (; x < nptrs; x++)
1232                                 brelse(bh[x]);
1233                         goto fail;
1234                 }
1235                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1236                         for (; x < nptrs; x++)
1237                                 brelse(bh[x]);
1238                         error = -EIO;
1239                         goto fail;
1240                 }
1241
1242                 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1243
1244                 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1245                        (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1246
1247                 amount -= sdp->sd_jbsize;
1248                 data += sdp->sd_jbsize;
1249
1250                 brelse(bh[x]);
1251         }
1252
1253 out:
1254         kfree(bh);
1255         return error;
1256
1257 fail:
1258         gfs2_trans_end(sdp);
1259         kfree(bh);
1260         return error;
1261 }
1262
1263 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
1264                       struct iattr *attr, char *data)
1265 {
1266         struct buffer_head *dibh;
1267         int error;
1268
1269         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
1270                 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1271                 if (error)
1272                         return error;
1273
1274                 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1275                 memcpy(GFS2_EA2DATA(el->el_ea), data,
1276                        GFS2_EA_DATA_LEN(el->el_ea));
1277         } else
1278                 error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);
1279
1280         if (error)
1281                 return error;
1282
1283         error = gfs2_meta_inode_buffer(ip, &dibh);
1284         if (!error) {
1285                 error = inode_setattr(&ip->i_inode, attr);
1286                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1287                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1288                 gfs2_dinode_out(ip, dibh->b_data);
1289                 brelse(dibh);
1290         }
1291
1292         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1293
1294         return error;
1295 }
1296
1297 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1298 {
1299         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1300         struct gfs2_rgrp_list rlist;
1301         struct buffer_head *indbh, *dibh;
1302         __be64 *eablk, *end;
1303         unsigned int rg_blocks = 0;
1304         u64 bstart = 0;
1305         unsigned int blen = 0;
1306         unsigned int blks = 0;
1307         unsigned int x;
1308         int error;
1309
1310         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1311
1312         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1313         if (error)
1314                 return error;
1315
1316         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1317                 error = -EIO;
1318                 goto out;
1319         }
1320
1321         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1322         end = eablk + sdp->sd_inptrs;
1323
1324         for (; eablk < end; eablk++) {
1325                 u64 bn;
1326
1327                 if (!*eablk)
1328                         break;
1329                 bn = be64_to_cpu(*eablk);
1330
1331                 if (bstart + blen == bn)
1332                         blen++;
1333                 else {
1334                         if (bstart)
1335                                 gfs2_rlist_add(sdp, &rlist, bstart);
1336                         bstart = bn;
1337                         blen = 1;
1338                 }
1339                 blks++;
1340         }
1341         if (bstart)
1342                 gfs2_rlist_add(sdp, &rlist, bstart);
1343         else
1344                 goto out;
1345
1346         gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1347
1348         for (x = 0; x < rlist.rl_rgrps; x++) {
1349                 struct gfs2_rgrpd *rgd;
1350                 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1351                 rg_blocks += rgd->rd_length;
1352         }
1353
1354         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1355         if (error)
1356                 goto out_rlist_free;
1357
1358         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1359                                  RES_STATFS + RES_QUOTA, blks);
1360         if (error)
1361                 goto out_gunlock;
1362
1363         gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1364
1365         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1366         bstart = 0;
1367         blen = 0;
1368
1369         for (; eablk < end; eablk++) {
1370                 u64 bn;
1371
1372                 if (!*eablk)
1373                         break;
1374                 bn = be64_to_cpu(*eablk);
1375
1376                 if (bstart + blen == bn)
1377                         blen++;
1378                 else {
1379                         if (bstart)
1380                                 gfs2_free_meta(ip, bstart, blen);
1381                         bstart = bn;
1382                         blen = 1;
1383                 }
1384
1385                 *eablk = 0;
1386                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1387         }
1388         if (bstart)
1389                 gfs2_free_meta(ip, bstart, blen);
1390
1391         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1392
1393         error = gfs2_meta_inode_buffer(ip, &dibh);
1394         if (!error) {
1395                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1396                 gfs2_dinode_out(ip, dibh->b_data);
1397                 brelse(dibh);
1398         }
1399
1400         gfs2_trans_end(sdp);
1401
1402 out_gunlock:
1403         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1404 out_rlist_free:
1405         gfs2_rlist_free(&rlist);
1406 out:
1407         brelse(indbh);
1408         return error;
1409 }
1410
1411 static int ea_dealloc_block(struct gfs2_inode *ip)
1412 {
1413         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1414         struct gfs2_alloc *al = ip->i_alloc;
1415         struct gfs2_rgrpd *rgd;
1416         struct buffer_head *dibh;
1417         int error;
1418
1419         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1420         if (!rgd) {
1421                 gfs2_consist_inode(ip);
1422                 return -EIO;
1423         }
1424
1425         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1426                                    &al->al_rgd_gh);
1427         if (error)
1428                 return error;
1429
1430         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1431                                  RES_QUOTA, 1);
1432         if (error)
1433                 goto out_gunlock;
1434
1435         gfs2_free_meta(ip, ip->i_eattr, 1);
1436
1437         ip->i_eattr = 0;
1438         gfs2_add_inode_blocks(&ip->i_inode, -1);
1439
1440         error = gfs2_meta_inode_buffer(ip, &dibh);
1441         if (!error) {
1442                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1443                 gfs2_dinode_out(ip, dibh->b_data);
1444                 brelse(dibh);
1445         }
1446
1447         gfs2_trans_end(sdp);
1448
1449 out_gunlock:
1450         gfs2_glock_dq_uninit(&al->al_rgd_gh);
1451         return error;
1452 }
1453
1454 /**
1455  * gfs2_ea_dealloc - deallocate the extended attribute fork
1456  * @ip: the inode
1457  *
1458  * Returns: errno
1459  */
1460
1461 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1462 {
1463         struct gfs2_alloc *al;
1464         int error;
1465
1466         al = gfs2_alloc_get(ip);
1467         if (!al)
1468                 return -ENOMEM;
1469
1470         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1471         if (error)
1472                 goto out_alloc;
1473
1474         error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1475         if (error)
1476                 goto out_quota;
1477
1478         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1479         if (error)
1480                 goto out_rindex;
1481
1482         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1483                 error = ea_dealloc_indirect(ip);
1484                 if (error)
1485                         goto out_rindex;
1486         }
1487
1488         error = ea_dealloc_block(ip);
1489
1490 out_rindex:
1491         gfs2_glock_dq_uninit(&al->al_ri_gh);
1492 out_quota:
1493         gfs2_quota_unhold(ip);
1494 out_alloc:
1495         gfs2_alloc_put(ip);
1496         return error;
1497 }
1498