fs/gfs2/xattr.c

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This source file includes following definitions.
ea_calc_size
ea_check_size
ea_foreach_i
ea_foreach
ea_find_i
gfs2_ea_find
ea_dealloc_unstuffed
ea_remove_unstuffed
ea_list_i
gfs2_listxattr
gfs2_iter_unstuffed
gfs2_ea_get_copy
gfs2_xattr_acl_get
__gfs2_xattr_get
gfs2_xattr_get
ea_alloc_blk
ea_write
ea_alloc_skeleton
ea_init_i
ea_init
ea_split_ea
ea_set_remove_stuffed
ea_set_simple_noalloc
ea_set_simple_alloc
ea_set_simple
ea_set_block
ea_set_i
ea_set_remove_unstuffed
ea_remove_stuffed
gfs2_xattr_remove
__gfs2_xattr_set
gfs2_xattr_set
ea_dealloc_indirect
ea_dealloc_block
gfs2_ea_dealloc
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5  */
   6 
   7 #include <linux/slab.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/completion.h>
  10 #include <linux/buffer_head.h>
  11 #include <linux/xattr.h>
  12 #include <linux/gfs2_ondisk.h>
  13 #include <linux/posix_acl_xattr.h>
  14 #include <linux/uaccess.h>
  15 
  16 #include "gfs2.h"
  17 #include "incore.h"
  18 #include "acl.h"
  19 #include "xattr.h"
  20 #include "glock.h"
  21 #include "inode.h"
  22 #include "meta_io.h"
  23 #include "quota.h"
  24 #include "rgrp.h"
  25 #include "super.h"
  26 #include "trans.h"
  27 #include "util.h"
  28 
  29 /**
  30  * ea_calc_size - returns the acutal number of bytes the request will take up
  31  *                (not counting any unstuffed data blocks)
  32  * @sdp:
  33  * @er:
  34  * @size:
  35  *
  36  * Returns: 1 if the EA should be stuffed
  37  */
  38 
  39 static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  40                         unsigned int *size)
  41 {
  42         unsigned int jbsize = sdp->sd_jbsize;
  43 
  44         /* Stuffed */
  45         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  46 
  47         if (*size <= jbsize)
  48                 return 1;
  49 
  50         /* Unstuffed */
  51         *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  52                       (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  53 
  54         return 0;
  55 }
  56 
  57 static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  58 {
  59         unsigned int size;
  60 
  61         if (dsize > GFS2_EA_MAX_DATA_LEN)
  62                 return -ERANGE;
  63 
  64         ea_calc_size(sdp, nsize, dsize, &size);
  65 
  66         /* This can only happen with 512 byte blocks */
  67         if (size > sdp->sd_jbsize)
  68                 return -ERANGE;
  69 
  70         return 0;
  71 }
  72 
  73 typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  74                           struct gfs2_ea_header *ea,
  75                           struct gfs2_ea_header *prev, void *private);
  76 
  77 static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  78                         ea_call_t ea_call, void *data)
  79 {
  80         struct gfs2_ea_header *ea, *prev = NULL;
  81         int error = 0;
  82 
  83         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  84                 return -EIO;
  85 
  86         for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  87                 if (!GFS2_EA_REC_LEN(ea))
  88                         goto fail;
  89                 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  90                                                   bh->b_data + bh->b_size))
  91                         goto fail;
  92                 if (!GFS2_EATYPE_VALID(ea->ea_type))
  93                         goto fail;
  94 
  95                 error = ea_call(ip, bh, ea, prev, data);
  96                 if (error)
  97                         return error;
  98 
  99                 if (GFS2_EA_IS_LAST(ea)) {
 100                         if ((char *)GFS2_EA2NEXT(ea) !=
 101                             bh->b_data + bh->b_size)
 102                                 goto fail;
 103                         break;
 104                 }
 105         }
 106 
 107         return error;
 108 
 109 fail:
 110         gfs2_consist_inode(ip);
 111         return -EIO;
 112 }
 113 
 114 static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 115 {
 116         struct buffer_head *bh, *eabh;
 117         __be64 *eablk, *end;
 118         int error;
 119 
 120         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
 121         if (error)
 122                 return error;
 123 
 124         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 125                 error = ea_foreach_i(ip, bh, ea_call, data);
 126                 goto out;
 127         }
 128 
 129         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 130                 error = -EIO;
 131                 goto out;
 132         }
 133 
 134         eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 135         end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 136 
 137         for (; eablk < end; eablk++) {
 138                 u64 bn;
 139 
 140                 if (!*eablk)
 141                         break;
 142                 bn = be64_to_cpu(*eablk);
 143 
 144                 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
 145                 if (error)
 146                         break;
 147                 error = ea_foreach_i(ip, eabh, ea_call, data);
 148                 brelse(eabh);
 149                 if (error)
 150                         break;
 151         }
 152 out:
 153         brelse(bh);
 154         return error;
 155 }
 156 
 157 struct ea_find {
 158         int type;
 159         const char *name;
 160         size_t namel;
 161         struct gfs2_ea_location *ef_el;
 162 };
 163 
 164 static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 165                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 166                      void *private)
 167 {
 168         struct ea_find *ef = private;
 169 
 170         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 171                 return 0;
 172 
 173         if (ea->ea_type == ef->type) {
 174                 if (ea->ea_name_len == ef->namel &&
 175                     !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 176                         struct gfs2_ea_location *el = ef->ef_el;
 177                         get_bh(bh);
 178                         el->el_bh = bh;
 179                         el->el_ea = ea;
 180                         el->el_prev = prev;
 181                         return 1;
 182                 }
 183         }
 184 
 185         return 0;
 186 }
 187 
 188 static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 189                         struct gfs2_ea_location *el)
 190 {
 191         struct ea_find ef;
 192         int error;
 193 
 194         ef.type = type;
 195         ef.name = name;
 196         ef.namel = strlen(name);
 197         ef.ef_el = el;
 198 
 199         memset(el, 0, sizeof(struct gfs2_ea_location));
 200 
 201         error = ea_foreach(ip, ea_find_i, &ef);
 202         if (error > 0)
 203                 return 0;
 204 
 205         return error;
 206 }
 207 
 208 /**
 209  * ea_dealloc_unstuffed -
 210  * @ip:
 211  * @bh:
 212  * @ea:
 213  * @prev:
 214  * @private:
 215  *
 216  * Take advantage of the fact that all unstuffed blocks are
 217  * allocated from the same RG.  But watch, this may not always
 218  * be true.
 219  *
 220  * Returns: errno
 221  */
 222 
 223 static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 224                                 struct gfs2_ea_header *ea,
 225                                 struct gfs2_ea_header *prev, void *private)
 226 {
 227         int *leave = private;
 228         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 229         struct gfs2_rgrpd *rgd;
 230         struct gfs2_holder rg_gh;
 231         __be64 *dataptrs;
 232         u64 bn = 0;
 233         u64 bstart = 0;
 234         unsigned int blen = 0;
 235         unsigned int blks = 0;
 236         unsigned int x;
 237         int error;
 238 
 239         error = gfs2_rindex_update(sdp);
 240         if (error)
 241                 return error;
 242 
 243         if (GFS2_EA_IS_STUFFED(ea))
 244                 return 0;
 245 
 246         dataptrs = GFS2_EA2DATAPTRS(ea);
 247         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 248                 if (*dataptrs) {
 249                         blks++;
 250                         bn = be64_to_cpu(*dataptrs);
 251                 }
 252         }
 253         if (!blks)
 254                 return 0;
 255 
 256         rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 257         if (!rgd) {
 258                 gfs2_consist_inode(ip);
 259                 return -EIO;
 260         }
 261 
 262         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 263         if (error)
 264                 return error;
 265 
 266         error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 267                                  RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 268         if (error)
 269                 goto out_gunlock;
 270 
 271         gfs2_trans_add_meta(ip->i_gl, bh);
 272 
 273         dataptrs = GFS2_EA2DATAPTRS(ea);
 274         for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 275                 if (!*dataptrs)
 276                         break;
 277                 bn = be64_to_cpu(*dataptrs);
 278 
 279                 if (bstart + blen == bn)
 280                         blen++;
 281                 else {
 282                         if (bstart)
 283                                 gfs2_free_meta(ip, rgd, bstart, blen);
 284                         bstart = bn;
 285                         blen = 1;
 286                 }
 287 
 288                 *dataptrs = 0;
 289                 gfs2_add_inode_blocks(&ip->i_inode, -1);
 290         }
 291         if (bstart)
 292                 gfs2_free_meta(ip, rgd, bstart, blen);
 293 
 294         if (prev && !leave) {
 295                 u32 len;
 296 
 297                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 298                 prev->ea_rec_len = cpu_to_be32(len);
 299 
 300                 if (GFS2_EA_IS_LAST(ea))
 301                         prev->ea_flags |= GFS2_EAFLAG_LAST;
 302         } else {
 303                 ea->ea_type = GFS2_EATYPE_UNUSED;
 304                 ea->ea_num_ptrs = 0;
 305         }
 306 
 307         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 308         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
 309 
 310         gfs2_trans_end(sdp);
 311 
 312 out_gunlock:
 313         gfs2_glock_dq_uninit(&rg_gh);
 314         return error;
 315 }
 316 
 317 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 318                                struct gfs2_ea_header *ea,
 319                                struct gfs2_ea_header *prev, int leave)
 320 {
 321         int error;
 322 
 323         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 324         if (error)
 325                 return error;
 326 
 327         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 328         if (error)
 329                 goto out_alloc;
 330 
 331         error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 332 
 333         gfs2_quota_unhold(ip);
 334 out_alloc:
 335         return error;
 336 }
 337 
 338 struct ea_list {
 339         struct gfs2_ea_request *ei_er;
 340         unsigned int ei_size;
 341 };
 342 
 343 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 344                      struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 345                      void *private)
 346 {
 347         struct ea_list *ei = private;
 348         struct gfs2_ea_request *er = ei->ei_er;
 349         unsigned int ea_size;
 350         char *prefix;
 351         unsigned int l;
 352 
 353         if (ea->ea_type == GFS2_EATYPE_UNUSED)
 354                 return 0;
 355 
 356         switch (ea->ea_type) {
 357         case GFS2_EATYPE_USR:
 358                 prefix = "user.";
 359                 l = 5;
 360                 break;
 361         case GFS2_EATYPE_SYS:
 362                 prefix = "system.";
 363                 l = 7;
 364                 break;
 365         case GFS2_EATYPE_SECURITY:
 366                 prefix = "security.";
 367                 l = 9;
 368                 break;
 369         default:
 370                 BUG();
 371         }
 372 
 373         ea_size = l + ea->ea_name_len + 1;
 374         if (er->er_data_len) {
 375                 if (ei->ei_size + ea_size > er->er_data_len)
 376                         return -ERANGE;
 377 
 378                 memcpy(er->er_data + ei->ei_size, prefix, l);
 379                 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 380                        ea->ea_name_len);
 381                 er->er_data[ei->ei_size + ea_size - 1] = 0;
 382         }
 383 
 384         ei->ei_size += ea_size;
 385 
 386         return 0;
 387 }
 388 
 389 /**
 390  * gfs2_listxattr - List gfs2 extended attributes
 391  * @dentry: The dentry whose inode we are interested in
 392  * @buffer: The buffer to write the results
 393  * @size: The size of the buffer
 394  *
 395  * Returns: actual size of data on success, -errno on error
 396  */
 397 
 398 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 399 {
 400         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 401         struct gfs2_ea_request er;
 402         struct gfs2_holder i_gh;
 403         int error;
 404 
 405         memset(&er, 0, sizeof(struct gfs2_ea_request));
 406         if (size) {
 407                 er.er_data = buffer;
 408                 er.er_data_len = size;
 409         }
 410 
 411         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 412         if (error)
 413                 return error;
 414 
 415         if (ip->i_eattr) {
 416                 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 417 
 418                 error = ea_foreach(ip, ea_list_i, &ei);
 419                 if (!error)
 420                         error = ei.ei_size;
 421         }
 422 
 423         gfs2_glock_dq_uninit(&i_gh);
 424 
 425         return error;
 426 }
 427 
 428 /**
 429  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 430  *                     request buffer
 431  * @ip: The GFS2 inode
 432  * @ea: The extended attribute header structure
 433  * @din: The data to be copied in
 434  * @dout: The data to be copied out (one of din,dout will be NULL)
 435  *
 436  * Returns: errno
 437  */
 438 
 439 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 440                                const char *din, char *dout)
 441 {
 442         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 443         struct buffer_head **bh;
 444         unsigned int amount = GFS2_EA_DATA_LEN(ea);
 445         unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 446         __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 447         unsigned int x;
 448         int error = 0;
 449         unsigned char *pos;
 450         unsigned cp_size;
 451 
 452         bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 453         if (!bh)
 454                 return -ENOMEM;
 455 
 456         for (x = 0; x < nptrs; x++) {
 457                 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
 458                                        bh + x);
 459                 if (error) {
 460                         while (x--)
 461                                 brelse(bh[x]);
 462                         goto out;
 463                 }
 464                 dataptrs++;
 465         }
 466 
 467         for (x = 0; x < nptrs; x++) {
 468                 error = gfs2_meta_wait(sdp, bh[x]);
 469                 if (error) {
 470                         for (; x < nptrs; x++)
 471                                 brelse(bh[x]);
 472                         goto out;
 473                 }
 474                 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 475                         for (; x < nptrs; x++)
 476                                 brelse(bh[x]);
 477                         error = -EIO;
 478                         goto out;
 479                 }
 480 
 481                 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 482                 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 483 
 484                 if (dout) {
 485                         memcpy(dout, pos, cp_size);
 486                         dout += sdp->sd_jbsize;
 487                 }
 488 
 489                 if (din) {
 490                         gfs2_trans_add_meta(ip->i_gl, bh[x]);
 491                         memcpy(pos, din, cp_size);
 492                         din += sdp->sd_jbsize;
 493                 }
 494 
 495                 amount -= sdp->sd_jbsize;
 496                 brelse(bh[x]);
 497         }
 498 
 499 out:
 500         kfree(bh);
 501         return error;
 502 }
 503 
 504 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 505                             char *data, size_t size)
 506 {
 507         int ret;
 508         size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 509         if (len > size)
 510                 return -ERANGE;
 511 
 512         if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 513                 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 514                 return len;
 515         }
 516         ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 517         if (ret < 0)
 518                 return ret;
 519         return len;
 520 }
 521 
 522 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 523 {
 524         struct gfs2_ea_location el;
 525         int error;
 526         int len;
 527         char *data;
 528 
 529         error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 530         if (error)
 531                 return error;
 532         if (!el.el_ea)
 533                 goto out;
 534         if (!GFS2_EA_DATA_LEN(el.el_ea))
 535                 goto out;
 536 
 537         len = GFS2_EA_DATA_LEN(el.el_ea);
 538         data = kmalloc(len, GFP_NOFS);
 539         error = -ENOMEM;
 540         if (data == NULL)
 541                 goto out;
 542 
 543         error = gfs2_ea_get_copy(ip, &el, data, len);
 544         if (error < 0)
 545                 kfree(data);
 546         else
 547                 *ppdata = data;
 548 out:
 549         brelse(el.el_bh);
 550         return error;
 551 }
 552 
 553 /**
 554  * gfs2_xattr_get - Get a GFS2 extended attribute
 555  * @inode: The inode
 556  * @name: The name of the extended attribute
 557  * @buffer: The buffer to write the result into
 558  * @size: The size of the buffer
 559  * @type: The type of extended attribute
 560  *
 561  * Returns: actual size of data on success, -errno on error
 562  */
 563 static int __gfs2_xattr_get(struct inode *inode, const char *name,
 564                             void *buffer, size_t size, int type)
 565 {
 566         struct gfs2_inode *ip = GFS2_I(inode);
 567         struct gfs2_ea_location el;
 568         int error;
 569 
 570         if (!ip->i_eattr)
 571                 return -ENODATA;
 572         if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 573                 return -EINVAL;
 574 
 575         error = gfs2_ea_find(ip, type, name, &el);
 576         if (error)
 577                 return error;
 578         if (!el.el_ea)
 579                 return -ENODATA;
 580         if (size)
 581                 error = gfs2_ea_get_copy(ip, &el, buffer, size);
 582         else
 583                 error = GFS2_EA_DATA_LEN(el.el_ea);
 584         brelse(el.el_bh);
 585 
 586         return error;
 587 }
 588 
 589 static int gfs2_xattr_get(const struct xattr_handler *handler,
 590                           struct dentry *unused, struct inode *inode,
 591                           const char *name, void *buffer, size_t size)
 592 {
 593         struct gfs2_inode *ip = GFS2_I(inode);
 594         struct gfs2_holder gh;
 595         int ret;
 596 
 597         /* During lookup, SELinux calls this function with the glock locked. */
 598 
 599         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 600                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 601                 if (ret)
 602                         return ret;
 603         } else {
 604                 gfs2_holder_mark_uninitialized(&gh);
 605         }
 606         ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
 607         if (gfs2_holder_initialized(&gh))
 608                 gfs2_glock_dq_uninit(&gh);
 609         return ret;
 610 }
 611 
 612 /**
 613  * ea_alloc_blk - allocates a new block for extended attributes.
 614  * @ip: A pointer to the inode that's getting extended attributes
 615  * @bhp: Pointer to pointer to a struct buffer_head
 616  *
 617  * Returns: errno
 618  */
 619 
 620 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 621 {
 622         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 623         struct gfs2_ea_header *ea;
 624         unsigned int n = 1;
 625         u64 block;
 626         int error;
 627 
 628         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 629         if (error)
 630                 return error;
 631         gfs2_trans_remove_revoke(sdp, block, 1);
 632         *bhp = gfs2_meta_new(ip->i_gl, block);
 633         gfs2_trans_add_meta(ip->i_gl, *bhp);
 634         gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 635         gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 636 
 637         ea = GFS2_EA_BH2FIRST(*bhp);
 638         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 639         ea->ea_type = GFS2_EATYPE_UNUSED;
 640         ea->ea_flags = GFS2_EAFLAG_LAST;
 641         ea->ea_num_ptrs = 0;
 642 
 643         gfs2_add_inode_blocks(&ip->i_inode, 1);
 644 
 645         return 0;
 646 }
 647 
 648 /**
 649  * ea_write - writes the request info to an ea, creating new blocks if
 650  *            necessary
 651  * @ip: inode that is being modified
 652  * @ea: the location of the new ea in a block
 653  * @er: the write request
 654  *
 655  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 656  *
 657  * returns : errno
 658  */
 659 
 660 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 661                     struct gfs2_ea_request *er)
 662 {
 663         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 664         int error;
 665 
 666         ea->ea_data_len = cpu_to_be32(er->er_data_len);
 667         ea->ea_name_len = er->er_name_len;
 668         ea->ea_type = er->er_type;
 669         ea->__pad = 0;
 670 
 671         memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 672 
 673         if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 674                 ea->ea_num_ptrs = 0;
 675                 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 676         } else {
 677                 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 678                 const char *data = er->er_data;
 679                 unsigned int data_len = er->er_data_len;
 680                 unsigned int copy;
 681                 unsigned int x;
 682 
 683                 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 684                 for (x = 0; x < ea->ea_num_ptrs; x++) {
 685                         struct buffer_head *bh;
 686                         u64 block;
 687                         int mh_size = sizeof(struct gfs2_meta_header);
 688                         unsigned int n = 1;
 689 
 690                         error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 691                         if (error)
 692                                 return error;
 693                         gfs2_trans_remove_revoke(sdp, block, 1);
 694                         bh = gfs2_meta_new(ip->i_gl, block);
 695                         gfs2_trans_add_meta(ip->i_gl, bh);
 696                         gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 697 
 698                         gfs2_add_inode_blocks(&ip->i_inode, 1);
 699 
 700                         copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 701                                                            data_len;
 702                         memcpy(bh->b_data + mh_size, data, copy);
 703                         if (copy < sdp->sd_jbsize)
 704                                 memset(bh->b_data + mh_size + copy, 0,
 705                                        sdp->sd_jbsize - copy);
 706 
 707                         *dataptr++ = cpu_to_be64(bh->b_blocknr);
 708                         data += copy;
 709                         data_len -= copy;
 710 
 711                         brelse(bh);
 712                 }
 713 
 714                 gfs2_assert_withdraw(sdp, !data_len);
 715         }
 716 
 717         return 0;
 718 }
 719 
 720 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 721                                    struct gfs2_ea_request *er, void *private);
 722 
 723 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 724                              unsigned int blks,
 725                              ea_skeleton_call_t skeleton_call, void *private)
 726 {
 727         struct gfs2_alloc_parms ap = { .target = blks };
 728         int error;
 729 
 730         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 731         if (error)
 732                 return error;
 733 
 734         error = gfs2_quota_lock_check(ip, &ap);
 735         if (error)
 736                 return error;
 737 
 738         error = gfs2_inplace_reserve(ip, &ap);
 739         if (error)
 740                 goto out_gunlock_q;
 741 
 742         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 743                                  blks + gfs2_rg_blocks(ip, blks) +
 744                                  RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 745         if (error)
 746                 goto out_ipres;
 747 
 748         error = skeleton_call(ip, er, private);
 749         if (error)
 750                 goto out_end_trans;
 751 
 752         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 753         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
 754 
 755 out_end_trans:
 756         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 757 out_ipres:
 758         gfs2_inplace_release(ip);
 759 out_gunlock_q:
 760         gfs2_quota_unlock(ip);
 761         return error;
 762 }
 763 
 764 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 765                      void *private)
 766 {
 767         struct buffer_head *bh;
 768         int error;
 769 
 770         error = ea_alloc_blk(ip, &bh);
 771         if (error)
 772                 return error;
 773 
 774         ip->i_eattr = bh->b_blocknr;
 775         error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 776 
 777         brelse(bh);
 778 
 779         return error;
 780 }
 781 
 782 /**
 783  * ea_init - initializes a new eattr block
 784  * @ip:
 785  * @er:
 786  *
 787  * Returns: errno
 788  */
 789 
 790 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 791                    const void *data, size_t size)
 792 {
 793         struct gfs2_ea_request er;
 794         unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 795         unsigned int blks = 1;
 796 
 797         er.er_type = type;
 798         er.er_name = name;
 799         er.er_name_len = strlen(name);
 800         er.er_data = (void *)data;
 801         er.er_data_len = size;
 802 
 803         if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 804                 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 805 
 806         return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 807 }
 808 
 809 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 810 {
 811         u32 ea_size = GFS2_EA_SIZE(ea);
 812         struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 813                                      ea_size);
 814         u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 815         int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 816 
 817         ea->ea_rec_len = cpu_to_be32(ea_size);
 818         ea->ea_flags ^= last;
 819 
 820         new->ea_rec_len = cpu_to_be32(new_size);
 821         new->ea_flags = last;
 822 
 823         return new;
 824 }
 825 
 826 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 827                                   struct gfs2_ea_location *el)
 828 {
 829         struct gfs2_ea_header *ea = el->el_ea;
 830         struct gfs2_ea_header *prev = el->el_prev;
 831         u32 len;
 832 
 833         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 834 
 835         if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 836                 ea->ea_type = GFS2_EATYPE_UNUSED;
 837                 return;
 838         } else if (GFS2_EA2NEXT(prev) != ea) {
 839                 prev = GFS2_EA2NEXT(prev);
 840                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 841         }
 842 
 843         len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 844         prev->ea_rec_len = cpu_to_be32(len);
 845 
 846         if (GFS2_EA_IS_LAST(ea))
 847                 prev->ea_flags |= GFS2_EAFLAG_LAST;
 848 }
 849 
 850 struct ea_set {
 851         int ea_split;
 852 
 853         struct gfs2_ea_request *es_er;
 854         struct gfs2_ea_location *es_el;
 855 
 856         struct buffer_head *es_bh;
 857         struct gfs2_ea_header *es_ea;
 858 };
 859 
 860 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 861                                  struct gfs2_ea_header *ea, struct ea_set *es)
 862 {
 863         struct gfs2_ea_request *er = es->es_er;
 864         int error;
 865 
 866         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 867         if (error)
 868                 return error;
 869 
 870         gfs2_trans_add_meta(ip->i_gl, bh);
 871 
 872         if (es->ea_split)
 873                 ea = ea_split_ea(ea);
 874 
 875         ea_write(ip, ea, er);
 876 
 877         if (es->es_el)
 878                 ea_set_remove_stuffed(ip, es->es_el);
 879 
 880         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 881         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
 882 
 883         gfs2_trans_end(GFS2_SB(&ip->i_inode));
 884         return error;
 885 }
 886 
 887 static int ea_set_simple_alloc(struct gfs2_inode *ip,
 888                                struct gfs2_ea_request *er, void *private)
 889 {
 890         struct ea_set *es = private;
 891         struct gfs2_ea_header *ea = es->es_ea;
 892         int error;
 893 
 894         gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 895 
 896         if (es->ea_split)
 897                 ea = ea_split_ea(ea);
 898 
 899         error = ea_write(ip, ea, er);
 900         if (error)
 901                 return error;
 902 
 903         if (es->es_el)
 904                 ea_set_remove_stuffed(ip, es->es_el);
 905 
 906         return 0;
 907 }
 908 
 909 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 910                          struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 911                          void *private)
 912 {
 913         struct ea_set *es = private;
 914         unsigned int size;
 915         int stuffed;
 916         int error;
 917 
 918         stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 919                                es->es_er->er_data_len, &size);
 920 
 921         if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 922                 if (GFS2_EA_REC_LEN(ea) < size)
 923                         return 0;
 924                 if (!GFS2_EA_IS_STUFFED(ea)) {
 925                         error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 926                         if (error)
 927                                 return error;
 928                 }
 929                 es->ea_split = 0;
 930         } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 931                 es->ea_split = 1;
 932         else
 933                 return 0;
 934 
 935         if (stuffed) {
 936                 error = ea_set_simple_noalloc(ip, bh, ea, es);
 937                 if (error)
 938                         return error;
 939         } else {
 940                 unsigned int blks;
 941 
 942                 es->es_bh = bh;
 943                 es->es_ea = ea;
 944                 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 945                                         GFS2_SB(&ip->i_inode)->sd_jbsize);
 946 
 947                 error = ea_alloc_skeleton(ip, es->es_er, blks,
 948                                           ea_set_simple_alloc, es);
 949                 if (error)
 950                         return error;
 951         }
 952 
 953         return 1;
 954 }
 955 
 956 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 957                         void *private)
 958 {
 959         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 960         struct buffer_head *indbh, *newbh;
 961         __be64 *eablk;
 962         int error;
 963         int mh_size = sizeof(struct gfs2_meta_header);
 964 
 965         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 966                 __be64 *end;
 967 
 968                 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
 969                                        &indbh);
 970                 if (error)
 971                         return error;
 972 
 973                 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 974                         error = -EIO;
 975                         goto out;
 976                 }
 977 
 978                 eablk = (__be64 *)(indbh->b_data + mh_size);
 979                 end = eablk + sdp->sd_inptrs;
 980 
 981                 for (; eablk < end; eablk++)
 982                         if (!*eablk)
 983                                 break;
 984 
 985                 if (eablk == end) {
 986                         error = -ENOSPC;
 987                         goto out;
 988                 }
 989 
 990                 gfs2_trans_add_meta(ip->i_gl, indbh);
 991         } else {
 992                 u64 blk;
 993                 unsigned int n = 1;
 994                 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
 995                 if (error)
 996                         return error;
 997                 gfs2_trans_remove_revoke(sdp, blk, 1);
 998                 indbh = gfs2_meta_new(ip->i_gl, blk);
 999                 gfs2_trans_add_meta(ip->i_gl, indbh);
1000                 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1001                 gfs2_buffer_clear_tail(indbh, mh_size);
1002 
1003                 eablk = (__be64 *)(indbh->b_data + mh_size);
1004                 *eablk = cpu_to_be64(ip->i_eattr);
1005                 ip->i_eattr = blk;
1006                 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1007                 gfs2_add_inode_blocks(&ip->i_inode, 1);
1008 
1009                 eablk++;
1010         }
1011 
1012         error = ea_alloc_blk(ip, &newbh);
1013         if (error)
1014                 goto out;
1015 
1016         *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1017         error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1018         brelse(newbh);
1019         if (error)
1020                 goto out;
1021 
1022         if (private)
1023                 ea_set_remove_stuffed(ip, private);
1024 
1025 out:
1026         brelse(indbh);
1027         return error;
1028 }
1029 
1030 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1031                     const void *value, size_t size, struct gfs2_ea_location *el)
1032 {
1033         struct gfs2_ea_request er;
1034         struct ea_set es;
1035         unsigned int blks = 2;
1036         int error;
1037 
1038         er.er_type = type;
1039         er.er_name = name;
1040         er.er_data = (void *)value;
1041         er.er_name_len = strlen(name);
1042         er.er_data_len = size;
1043 
1044         memset(&es, 0, sizeof(struct ea_set));
1045         es.es_er = &er;
1046         es.es_el = el;
1047 
1048         error = ea_foreach(ip, ea_set_simple, &es);
1049         if (error > 0)
1050                 return 0;
1051         if (error)
1052                 return error;
1053 
1054         if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1055                 blks++;
1056         if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1057                 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1058 
1059         return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1060 }
1061 
1062 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1063                                    struct gfs2_ea_location *el)
1064 {
1065         if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1066                 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1067                 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1068                                      GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1069         }
1070 
1071         return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1072 }
1073 
1074 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1075 {
1076         struct gfs2_ea_header *ea = el->el_ea;
1077         struct gfs2_ea_header *prev = el->el_prev;
1078         int error;
1079 
1080         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1081         if (error)
1082                 return error;
1083 
1084         gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1085 
1086         if (prev) {
1087                 u32 len;
1088 
1089                 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1090                 prev->ea_rec_len = cpu_to_be32(len);
1091 
1092                 if (GFS2_EA_IS_LAST(ea))
1093                         prev->ea_flags |= GFS2_EAFLAG_LAST;
1094         } else {
1095                 ea->ea_type = GFS2_EATYPE_UNUSED;
1096         }
1097 
1098         ip->i_inode.i_ctime = current_time(&ip->i_inode);
1099         __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1100 
1101         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1102 
1103         return error;
1104 }
1105 
1106 /**
1107  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1108  * @ip: The inode
1109  * @type: The type of the extended attribute
1110  * @name: The name of the extended attribute
1111  *
1112  * This is not called directly by the VFS since we use the (common)
1113  * scheme of making a "set with NULL data" mean a remove request. Note
1114  * that this is different from a set with zero length data.
1115  *
1116  * Returns: 0, or errno on failure
1117  */
1118 
1119 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1120 {
1121         struct gfs2_ea_location el;
1122         int error;
1123 
1124         if (!ip->i_eattr)
1125                 return -ENODATA;
1126 
1127         error = gfs2_ea_find(ip, type, name, &el);
1128         if (error)
1129                 return error;
1130         if (!el.el_ea)
1131                 return -ENODATA;
1132 
1133         if (GFS2_EA_IS_STUFFED(el.el_ea))
1134                 error = ea_remove_stuffed(ip, &el);
1135         else
1136                 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1137 
1138         brelse(el.el_bh);
1139 
1140         return error;
1141 }
1142 
1143 /**
1144  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1145  * @ip: The inode
1146  * @name: The name of the extended attribute
1147  * @value: The value of the extended attribute (NULL for remove)
1148  * @size: The size of the @value argument
1149  * @flags: Create or Replace
1150  * @type: The type of the extended attribute
1151  *
1152  * See gfs2_xattr_remove() for details of the removal of xattrs.
1153  *
1154  * Returns: 0 or errno on failure
1155  */
1156 
1157 int __gfs2_xattr_set(struct inode *inode, const char *name,
1158                    const void *value, size_t size, int flags, int type)
1159 {
1160         struct gfs2_inode *ip = GFS2_I(inode);
1161         struct gfs2_sbd *sdp = GFS2_SB(inode);
1162         struct gfs2_ea_location el;
1163         unsigned int namel = strlen(name);
1164         int error;
1165 
1166         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1167                 return -EPERM;
1168         if (namel > GFS2_EA_MAX_NAME_LEN)
1169                 return -ERANGE;
1170 
1171         if (value == NULL) {
1172                 error = gfs2_xattr_remove(ip, type, name);
1173                 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1174                         error = 0;
1175                 return error;
1176         }
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 
1216 static int gfs2_xattr_set(const struct xattr_handler *handler,
1217                           struct dentry *unused, struct inode *inode,
1218                           const char *name, const void *value,
1219                           size_t size, int flags)
1220 {
1221         struct gfs2_inode *ip = GFS2_I(inode);
1222         struct gfs2_holder gh;
1223         int ret;
1224 
1225         ret = gfs2_rsqa_alloc(ip);
1226         if (ret)
1227                 return ret;
1228 
1229         /* May be called from gfs_setattr with the glock locked. */
1230 
1231         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1232                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1233                 if (ret)
1234                         return ret;
1235         } else {
1236                 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
1237                         return -EIO;
1238                 gfs2_holder_mark_uninitialized(&gh);
1239         }
1240         ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1241         if (gfs2_holder_initialized(&gh))
1242                 gfs2_glock_dq_uninit(&gh);
1243         return ret;
1244 }
1245 
1246 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1247 {
1248         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1249         struct gfs2_rgrp_list rlist;
1250         struct gfs2_rgrpd *rgd;
1251         struct buffer_head *indbh, *dibh;
1252         __be64 *eablk, *end;
1253         unsigned int rg_blocks = 0;
1254         u64 bstart = 0;
1255         unsigned int blen = 0;
1256         unsigned int blks = 0;
1257         unsigned int x;
1258         int error;
1259 
1260         error = gfs2_rindex_update(sdp);
1261         if (error)
1262                 return error;
1263 
1264         memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1265 
1266         error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1267         if (error)
1268                 return error;
1269 
1270         if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1271                 error = -EIO;
1272                 goto out;
1273         }
1274 
1275         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1276         end = eablk + sdp->sd_inptrs;
1277 
1278         for (; eablk < end; eablk++) {
1279                 u64 bn;
1280 
1281                 if (!*eablk)
1282                         break;
1283                 bn = be64_to_cpu(*eablk);
1284 
1285                 if (bstart + blen == bn)
1286                         blen++;
1287                 else {
1288                         if (bstart)
1289                                 gfs2_rlist_add(ip, &rlist, bstart);
1290                         bstart = bn;
1291                         blen = 1;
1292                 }
1293                 blks++;
1294         }
1295         if (bstart)
1296                 gfs2_rlist_add(ip, &rlist, bstart);
1297         else
1298                 goto out;
1299 
1300         gfs2_rlist_alloc(&rlist);
1301 
1302         for (x = 0; x < rlist.rl_rgrps; x++) {
1303                 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1304                 rg_blocks += rgd->rd_length;
1305         }
1306 
1307         error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1308         if (error)
1309                 goto out_rlist_free;
1310 
1311         error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1312                                  RES_STATFS + RES_QUOTA, blks);
1313         if (error)
1314                 goto out_gunlock;
1315 
1316         gfs2_trans_add_meta(ip->i_gl, indbh);
1317 
1318         eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1319         bstart = 0;
1320         rgd = NULL;
1321         blen = 0;
1322 
1323         for (; eablk < end; eablk++) {
1324                 u64 bn;
1325 
1326                 if (!*eablk)
1327                         break;
1328                 bn = be64_to_cpu(*eablk);
1329 
1330                 if (bstart + blen == bn)
1331                         blen++;
1332                 else {
1333                         if (bstart)
1334                                 gfs2_free_meta(ip, rgd, bstart, blen);
1335                         bstart = bn;
1336                         rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1337                         blen = 1;
1338                 }
1339 
1340                 *eablk = 0;
1341                 gfs2_add_inode_blocks(&ip->i_inode, -1);
1342         }
1343         if (bstart)
1344                 gfs2_free_meta(ip, rgd, bstart, blen);
1345 
1346         ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1347 
1348         error = gfs2_meta_inode_buffer(ip, &dibh);
1349         if (!error) {
1350                 gfs2_trans_add_meta(ip->i_gl, dibh);
1351                 gfs2_dinode_out(ip, dibh->b_data);
1352                 brelse(dibh);
1353         }
1354 
1355         gfs2_trans_end(sdp);
1356 
1357 out_gunlock:
1358         gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1359 out_rlist_free:
1360         gfs2_rlist_free(&rlist);
1361 out:
1362         brelse(indbh);
1363         return error;
1364 }
1365 
1366 static int ea_dealloc_block(struct gfs2_inode *ip)
1367 {
1368         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1369         struct gfs2_rgrpd *rgd;
1370         struct buffer_head *dibh;
1371         struct gfs2_holder gh;
1372         int error;
1373 
1374         error = gfs2_rindex_update(sdp);
1375         if (error)
1376                 return error;
1377 
1378         rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1379         if (!rgd) {
1380                 gfs2_consist_inode(ip);
1381                 return -EIO;
1382         }
1383 
1384         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1385         if (error)
1386                 return error;
1387 
1388         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1389                                  RES_QUOTA, 1);
1390         if (error)
1391                 goto out_gunlock;
1392 
1393         gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1394 
1395         ip->i_eattr = 0;
1396         gfs2_add_inode_blocks(&ip->i_inode, -1);
1397 
1398         error = gfs2_meta_inode_buffer(ip, &dibh);
1399         if (!error) {
1400                 gfs2_trans_add_meta(ip->i_gl, dibh);
1401                 gfs2_dinode_out(ip, dibh->b_data);
1402                 brelse(dibh);
1403         }
1404 
1405         gfs2_trans_end(sdp);
1406 
1407 out_gunlock:
1408         gfs2_glock_dq_uninit(&gh);
1409         return error;
1410 }
1411 
1412 /**
1413  * gfs2_ea_dealloc - deallocate the extended attribute fork
1414  * @ip: the inode
1415  *
1416  * Returns: errno
1417  */
1418 
1419 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1420 {
1421         int error;
1422 
1423         error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1424         if (error)
1425                 return error;
1426 
1427         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1428         if (error)
1429                 return error;
1430 
1431         error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1432         if (error)
1433                 goto out_quota;
1434 
1435         if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1436                 error = ea_dealloc_indirect(ip);
1437                 if (error)
1438                         goto out_quota;
1439         }
1440 
1441         error = ea_dealloc_block(ip);
1442 
1443 out_quota:
1444         gfs2_quota_unhold(ip);
1445         return error;
1446 }
1447 
1448 static const struct xattr_handler gfs2_xattr_user_handler = {
1449         .prefix = XATTR_USER_PREFIX,
1450         .flags  = GFS2_EATYPE_USR,
1451         .get    = gfs2_xattr_get,
1452         .set    = gfs2_xattr_set,
1453 };
1454 
1455 static const struct xattr_handler gfs2_xattr_security_handler = {
1456         .prefix = XATTR_SECURITY_PREFIX,
1457         .flags  = GFS2_EATYPE_SECURITY,
1458         .get    = gfs2_xattr_get,
1459         .set    = gfs2_xattr_set,
1460 };
1461 
1462 const struct xattr_handler *gfs2_xattr_handlers[] = {
1463         &gfs2_xattr_user_handler,
1464         &gfs2_xattr_security_handler,
1465         &posix_acl_access_xattr_handler,
1466         &posix_acl_default_xattr_handler,
1467         NULL,
1468 };
1469
/* [<][>][^][v][top][bottom][index][help] */
root/fs/gfs2/xattr.c

DEFINITIONS
