fs/gfs2/ops_inode.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/namei.h>
  15 #include <linux/utsname.h>
  16 #include <linux/mm.h>
  17 #include <linux/xattr.h>
  18 #include <linux/posix_acl.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/crc32.h>
  21 #include <linux/fiemap.h>
  22 #include <asm/uaccess.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "acl.h"
  27 #include "bmap.h"
  28 #include "dir.h"
  29 #include "eaops.h"
  30 #include "eattr.h"
  31 #include "glock.h"
  32 #include "inode.h"
  33 #include "meta_io.h"
  34 #include "quota.h"
  35 #include "rgrp.h"
  36 #include "trans.h"
  37 #include "util.h"
  38 #include "super.h"
  39
  40 /**
  41  * gfs2_create - Create a file
  42  * @dir: The directory in which to create the file
  43  * @dentry: The dentry of the new file
  44  * @mode: The mode of the new file
  45  *
  46  * Returns: errno
  47  */
  48
  49 static int gfs2_create(struct inode *dir, struct dentry *dentry,
  50                        int mode, struct nameidata *nd)
  51 {
  52         struct gfs2_inode *dip = GFS2_I(dir);
  53         struct gfs2_sbd *sdp = GFS2_SB(dir);
  54         struct gfs2_holder ghs[2];
  55         struct inode *inode;
  56
  57         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
  58
  59         for (;;) {
  60                 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
  61                 if (!IS_ERR(inode)) {
  62                         gfs2_trans_end(sdp);
  63                         if (dip->i_alloc->al_rgd)
  64                                 gfs2_inplace_release(dip);
  65                         gfs2_quota_unlock(dip);
  66                         gfs2_alloc_put(dip);
  67                         gfs2_glock_dq_uninit_m(2, ghs);
  68                         mark_inode_dirty(inode);
  69                         break;
  70                 } else if (PTR_ERR(inode) != -EEXIST ||
  71                            (nd && nd->flags & LOOKUP_EXCL)) {
  72                         gfs2_holder_uninit(ghs);
  73                         return PTR_ERR(inode);
  74                 }
  75
  76                 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
  77                 if (inode) {
  78                         if (!IS_ERR(inode)) {
  79                                 gfs2_holder_uninit(ghs);
  80                                 break;
  81                         } else {
  82                                 gfs2_holder_uninit(ghs);
  83                                 return PTR_ERR(inode);
  84                         }
  85                 }
  86         }
  87
  88         d_instantiate(dentry, inode);
  89
  90         return 0;
  91 }
  92
  93 /**
  94  * gfs2_lookup - Look up a filename in a directory and return its inode
  95  * @dir: The directory inode
  96  * @dentry: The dentry of the new inode
  97  * @nd: passed from Linux VFS, ignored by us
  98  *
  99  * Called by the VFS layer. Lock dir and call gfs2_lookupi()
 100  *
 101  * Returns: errno
 102  */
 103
 104 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 105                                   struct nameidata *nd)
 106 {
 107         struct inode *inode = NULL;
 108
 109         dentry->d_op = &gfs2_dops;
 110
 111         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 112         if (inode && IS_ERR(inode))
 113                 return ERR_CAST(inode);
 114
 115         if (inode) {
 116                 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
 117                 struct gfs2_holder gh;
 118                 int error;
 119                 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 120                 if (error) {
 121                         iput(inode);
 122                         return ERR_PTR(error);
 123                 }
 124                 gfs2_glock_dq_uninit(&gh);
 125                 return d_splice_alias(inode, dentry);
 126         }
 127         d_add(dentry, inode);
 128
 129         return NULL;
 130 }
 131
 132 /**
 133  * gfs2_link - Link to a file
 134  * @old_dentry: The inode to link
 135  * @dir: Add link to this directory
 136  * @dentry: The name of the link
 137  *
 138  * Link the inode in "old_dentry" into the directory "dir" with the
 139  * name in "dentry".
 140  *
 141  * Returns: errno
 142  */
 143
 144 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 145                      struct dentry *dentry)
 146 {
 147         struct gfs2_inode *dip = GFS2_I(dir);
 148         struct gfs2_sbd *sdp = GFS2_SB(dir);
 149         struct inode *inode = old_dentry->d_inode;
 150         struct gfs2_inode *ip = GFS2_I(inode);
 151         struct gfs2_holder ghs[2];
 152         int alloc_required;
 153         int error;
 154
 155         if (S_ISDIR(inode->i_mode))
 156                 return -EPERM;
 157
 158         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 159         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 160
 161         error = gfs2_glock_nq(ghs); /* parent */
 162         if (error)
 163                 goto out_parent;
 164
 165         error = gfs2_glock_nq(ghs + 1); /* child */
 166         if (error)
 167                 goto out_child;
 168
 169         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
 170         if (error)
 171                 goto out_gunlock;
 172
 173         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 174         switch (error) {
 175         case -ENOENT:
 176                 break;
 177         case 0:
 178                 error = -EEXIST;
 179         default:
 180                 goto out_gunlock;
 181         }
 182
 183         error = -EINVAL;
 184         if (!dip->i_inode.i_nlink)
 185                 goto out_gunlock;
 186         error = -EFBIG;
 187         if (dip->i_entries == (u32)-1)
 188                 goto out_gunlock;
 189         error = -EPERM;
 190         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 191                 goto out_gunlock;
 192         error = -EINVAL;
 193         if (!ip->i_inode.i_nlink)
 194                 goto out_gunlock;
 195         error = -EMLINK;
 196         if (ip->i_inode.i_nlink == (u32)-1)
 197                 goto out_gunlock;
 198
 199         alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
 200         if (error < 0)
 201                 goto out_gunlock;
 202         error = 0;
 203
 204         if (alloc_required) {
 205                 struct gfs2_alloc *al = gfs2_alloc_get(dip);
 206                 if (!al) {
 207                         error = -ENOMEM;
 208                         goto out_gunlock;
 209                 }
 210
 211                 error = gfs2_quota_lock_check(dip);
 212                 if (error)
 213                         goto out_alloc;
 214
 215                 al->al_requested = sdp->sd_max_dirres;
 216
 217                 error = gfs2_inplace_reserve(dip);
 218                 if (error)
 219                         goto out_gunlock_q;
 220
 221                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 222                                          al->al_rgd->rd_length +
 223                                          2 * RES_DINODE + RES_STATFS +
 224                                          RES_QUOTA, 0);
 225                 if (error)
 226                         goto out_ipres;
 227         } else {
 228                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 229                 if (error)
 230                         goto out_ipres;
 231         }
 232
 233         error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
 234         if (error)
 235                 goto out_end_trans;
 236
 237         error = gfs2_change_nlink(ip, +1);
 238
 239 out_end_trans:
 240         gfs2_trans_end(sdp);
 241 out_ipres:
 242         if (alloc_required)
 243                 gfs2_inplace_release(dip);
 244 out_gunlock_q:
 245         if (alloc_required)
 246                 gfs2_quota_unlock(dip);
 247 out_alloc:
 248         if (alloc_required)
 249                 gfs2_alloc_put(dip);
 250 out_gunlock:
 251         gfs2_glock_dq(ghs + 1);
 252 out_child:
 253         gfs2_glock_dq(ghs);
 254 out_parent:
 255         gfs2_holder_uninit(ghs);
 256         gfs2_holder_uninit(ghs + 1);
 257         if (!error) {
 258                 atomic_inc(&inode->i_count);
 259                 d_instantiate(dentry, inode);
 260                 mark_inode_dirty(inode);
 261         }
 262         return error;
 263 }
 264
 265 /*
 266  * gfs2_unlink_ok - check to see that a inode is still in a directory
 267  * @dip: the directory
 268  * @name: the name of the file
 269  * @ip: the inode
 270  *
 271  * Assumes that the lock on (at least) @dip is held.
 272  *
 273  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
 274  */
 275
 276 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
 277                           const struct gfs2_inode *ip)
 278 {
 279         int error;
 280
 281         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
 282                 return -EPERM;
 283
 284         if ((dip->i_inode.i_mode & S_ISVTX) &&
 285             dip->i_inode.i_uid != current_fsuid() &&
 286             ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
 287                 return -EPERM;
 288
 289         if (IS_APPEND(&dip->i_inode))
 290                 return -EPERM;
 291
 292         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
 293         if (error)
 294                 return error;
 295
 296         error = gfs2_dir_check(&dip->i_inode, name, ip);
 297         if (error)
 298                 return error;
 299
 300         return 0;
 301 }
 302
 303 /**
 304  * gfs2_unlink - Unlink a file
 305  * @dir: The inode of the directory containing the file to unlink
 306  * @dentry: The file itself
 307  *
 308  * Unlink a file.  Call gfs2_unlinki()
 309  *
 310  * Returns: errno
 311  */
 312
 313 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 314 {
 315         struct gfs2_inode *dip = GFS2_I(dir);
 316         struct gfs2_sbd *sdp = GFS2_SB(dir);
 317         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 318         struct gfs2_holder ghs[3];
 319         struct gfs2_rgrpd *rgd;
 320         struct gfs2_holder ri_gh;
 321         int error;
 322
 323         error = gfs2_rindex_hold(sdp, &ri_gh);
 324         if (error)
 325                 return error;
 326
 327         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 328         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
 329
 330         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 331         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 332
 333
 334         error = gfs2_glock_nq(ghs); /* parent */
 335         if (error)
 336                 goto out_parent;
 337
 338         error = gfs2_glock_nq(ghs + 1); /* child */
 339         if (error)
 340                 goto out_child;
 341
 342         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 343         if (error)
 344                 goto out_rgrp;
 345
 346         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 347         if (error)
 348                 goto out_gunlock;
 349
 350         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 351         if (error)
 352                 goto out_rgrp;
 353
 354         error = gfs2_dir_del(dip, &dentry->d_name);
 355         if (error)
 356                 goto out_end_trans;
 357
 358         error = gfs2_change_nlink(ip, -1);
 359
 360 out_end_trans:
 361         gfs2_trans_end(sdp);
 362 out_gunlock:
 363         gfs2_glock_dq(ghs + 2);
 364 out_rgrp:
 365         gfs2_holder_uninit(ghs + 2);
 366         gfs2_glock_dq(ghs + 1);
 367 out_child:
 368         gfs2_holder_uninit(ghs + 1);
 369         gfs2_glock_dq(ghs);
 370 out_parent:
 371         gfs2_holder_uninit(ghs);
 372         gfs2_glock_dq_uninit(&ri_gh);
 373         return error;
 374 }
 375
 376 /**
 377  * gfs2_symlink - Create a symlink
 378  * @dir: The directory to create the symlink in
 379  * @dentry: The dentry to put the symlink in
 380  * @symname: The thing which the link points to
 381  *
 382  * Returns: errno
 383  */
 384
 385 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 386                         const char *symname)
 387 {
 388         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 389         struct gfs2_sbd *sdp = GFS2_SB(dir);
 390         struct gfs2_holder ghs[2];
 391         struct inode *inode;
 392         struct buffer_head *dibh;
 393         int size;
 394         int error;
 395
 396         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 397         size = strlen(symname);
 398         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 399                 return -ENAMETOOLONG;
 400
 401         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 402
 403         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 404         if (IS_ERR(inode)) {
 405                 gfs2_holder_uninit(ghs);
 406                 return PTR_ERR(inode);
 407         }
 408
 409         ip = ghs[1].gh_gl->gl_object;
 410
 411         ip->i_disksize = size;
 412         i_size_write(inode, size);
 413
 414         error = gfs2_meta_inode_buffer(ip, &dibh);
 415
 416         if (!gfs2_assert_withdraw(sdp, !error)) {
 417                 gfs2_dinode_out(ip, dibh->b_data);
 418                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 419                        size);
 420                 brelse(dibh);
 421         }
 422
 423         gfs2_trans_end(sdp);
 424         if (dip->i_alloc->al_rgd)
 425                 gfs2_inplace_release(dip);
 426         gfs2_quota_unlock(dip);
 427         gfs2_alloc_put(dip);
 428
 429         gfs2_glock_dq_uninit_m(2, ghs);
 430
 431         d_instantiate(dentry, inode);
 432         mark_inode_dirty(inode);
 433
 434         return 0;
 435 }
 436
 437 /**
 438  * gfs2_mkdir - Make a directory
 439  * @dir: The parent directory of the new one
 440  * @dentry: The dentry of the new directory
 441  * @mode: The mode of the new directory
 442  *
 443  * Returns: errno
 444  */
 445
 446 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 447 {
 448         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 449         struct gfs2_sbd *sdp = GFS2_SB(dir);
 450         struct gfs2_holder ghs[2];
 451         struct inode *inode;
 452         struct buffer_head *dibh;
 453         int error;
 454
 455         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 456
 457         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 458         if (IS_ERR(inode)) {
 459                 gfs2_holder_uninit(ghs);
 460                 return PTR_ERR(inode);
 461         }
 462
 463         ip = ghs[1].gh_gl->gl_object;
 464
 465         ip->i_inode.i_nlink = 2;
 466         ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 467         ip->i_diskflags |= GFS2_DIF_JDATA;
 468         ip->i_entries = 2;
 469
 470         error = gfs2_meta_inode_buffer(ip, &dibh);
 471
 472         if (!gfs2_assert_withdraw(sdp, !error)) {
 473                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 474                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 475                 struct qstr str;
 476
 477                 gfs2_str2qstr(&str, ".");
 478                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 479                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 480                 dent->de_inum = di->di_num; /* already GFS2 endian */
 481                 dent->de_type = cpu_to_be16(DT_DIR);
 482                 di->di_entries = cpu_to_be32(1);
 483
 484                 gfs2_str2qstr(&str, "..");
 485                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 486                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 487
 488                 gfs2_inum_out(dip, dent);
 489                 dent->de_type = cpu_to_be16(DT_DIR);
 490
 491                 gfs2_dinode_out(ip, di);
 492
 493                 brelse(dibh);
 494         }
 495
 496         error = gfs2_change_nlink(dip, +1);
 497         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 498
 499         gfs2_trans_end(sdp);
 500         if (dip->i_alloc->al_rgd)
 501                 gfs2_inplace_release(dip);
 502         gfs2_quota_unlock(dip);
 503         gfs2_alloc_put(dip);
 504
 505         gfs2_glock_dq_uninit_m(2, ghs);
 506
 507         d_instantiate(dentry, inode);
 508         mark_inode_dirty(inode);
 509
 510         return 0;
 511 }
 512
 513 /**
 514  * gfs2_rmdiri - Remove a directory
 515  * @dip: The parent directory of the directory to be removed
 516  * @name: The name of the directory to be removed
 517  * @ip: The GFS2 inode of the directory to be removed
 518  *
 519  * Assumes Glocks on dip and ip are held
 520  *
 521  * Returns: errno
 522  */
 523
 524 static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
 525                        struct gfs2_inode *ip)
 526 {
 527         struct qstr dotname;
 528         int error;
 529
 530         if (ip->i_entries != 2) {
 531                 if (gfs2_consist_inode(ip))
 532                         gfs2_dinode_print(ip);
 533                 return -EIO;
 534         }
 535
 536         error = gfs2_dir_del(dip, name);
 537         if (error)
 538                 return error;
 539
 540         error = gfs2_change_nlink(dip, -1);
 541         if (error)
 542                 return error;
 543
 544         gfs2_str2qstr(&dotname, ".");
 545         error = gfs2_dir_del(ip, &dotname);
 546         if (error)
 547                 return error;
 548
 549         gfs2_str2qstr(&dotname, "..");
 550         error = gfs2_dir_del(ip, &dotname);
 551         if (error)
 552                 return error;
 553
 554         /* It looks odd, but it really should be done twice */
 555         error = gfs2_change_nlink(ip, -1);
 556         if (error)
 557                 return error;
 558
 559         error = gfs2_change_nlink(ip, -1);
 560         if (error)
 561                 return error;
 562
 563         return error;
 564 }
 565
 566 /**
 567  * gfs2_rmdir - Remove a directory
 568  * @dir: The parent directory of the directory to be removed
 569  * @dentry: The dentry of the directory to remove
 570  *
 571  * Remove a directory. Call gfs2_rmdiri()
 572  *
 573  * Returns: errno
 574  */
 575
 576 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 577 {
 578         struct gfs2_inode *dip = GFS2_I(dir);
 579         struct gfs2_sbd *sdp = GFS2_SB(dir);
 580         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 581         struct gfs2_holder ghs[3];
 582         struct gfs2_rgrpd *rgd;
 583         struct gfs2_holder ri_gh;
 584         int error;
 585
 586         error = gfs2_rindex_hold(sdp, &ri_gh);
 587         if (error)
 588                 return error;
 589         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 590         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 591
 592         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 593         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 594
 595         error = gfs2_glock_nq(ghs); /* parent */
 596         if (error)
 597                 goto out_parent;
 598
 599         error = gfs2_glock_nq(ghs + 1); /* child */
 600         if (error)
 601                 goto out_child;
 602
 603         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 604         if (error)
 605                 goto out_rgrp;
 606
 607         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 608         if (error)
 609                 goto out_gunlock;
 610
 611         if (ip->i_entries < 2) {
 612                 if (gfs2_consist_inode(ip))
 613                         gfs2_dinode_print(ip);
 614                 error = -EIO;
 615                 goto out_gunlock;
 616         }
 617         if (ip->i_entries > 2) {
 618                 error = -ENOTEMPTY;
 619                 goto out_gunlock;
 620         }
 621
 622         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 623         if (error)
 624                 goto out_gunlock;
 625
 626         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 627
 628         gfs2_trans_end(sdp);
 629
 630 out_gunlock:
 631         gfs2_glock_dq(ghs + 2);
 632 out_rgrp:
 633         gfs2_holder_uninit(ghs + 2);
 634         gfs2_glock_dq(ghs + 1);
 635 out_child:
 636         gfs2_holder_uninit(ghs + 1);
 637         gfs2_glock_dq(ghs);
 638 out_parent:
 639         gfs2_holder_uninit(ghs);
 640         gfs2_glock_dq_uninit(&ri_gh);
 641         return error;
 642 }
 643
 644 /**
 645  * gfs2_mknod - Make a special file
 646  * @dir: The directory in which the special file will reside
 647  * @dentry: The dentry of the special file
 648  * @mode: The mode of the special file
 649  * @rdev: The device specification of the special file
 650  *
 651  */
 652
 653 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 654                       dev_t dev)
 655 {
 656         struct gfs2_inode *dip = GFS2_I(dir);
 657         struct gfs2_sbd *sdp = GFS2_SB(dir);
 658         struct gfs2_holder ghs[2];
 659         struct inode *inode;
 660
 661         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 662
 663         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 664         if (IS_ERR(inode)) {
 665                 gfs2_holder_uninit(ghs);
 666                 return PTR_ERR(inode);
 667         }
 668
 669         gfs2_trans_end(sdp);
 670         if (dip->i_alloc->al_rgd)
 671                 gfs2_inplace_release(dip);
 672         gfs2_quota_unlock(dip);
 673         gfs2_alloc_put(dip);
 674
 675         gfs2_glock_dq_uninit_m(2, ghs);
 676
 677         d_instantiate(dentry, inode);
 678         mark_inode_dirty(inode);
 679
 680         return 0;
 681 }
 682
 683 /*
 684  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
 685  * @this: move this
 686  * @to: to here
 687  *
 688  * Follow @to back to the root and make sure we don't encounter @this
 689  * Assumes we already hold the rename lock.
 690  *
 691  * Returns: errno
 692  */
 693
 694 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
 695 {
 696         struct inode *dir = &to->i_inode;
 697         struct super_block *sb = dir->i_sb;
 698         struct inode *tmp;
 699         struct qstr dotdot;
 700         int error = 0;
 701
 702         gfs2_str2qstr(&dotdot, "..");
 703
 704         igrab(dir);
 705
 706         for (;;) {
 707                 if (dir == &this->i_inode) {
 708                         error = -EINVAL;
 709                         break;
 710                 }
 711                 if (dir == sb->s_root->d_inode) {
 712                         error = 0;
 713                         break;
 714                 }
 715
 716                 tmp = gfs2_lookupi(dir, &dotdot, 1);
 717                 if (IS_ERR(tmp)) {
 718                         error = PTR_ERR(tmp);
 719                         break;
 720                 }
 721
 722                 iput(dir);
 723                 dir = tmp;
 724         }
 725
 726         iput(dir);
 727
 728         return error;
 729 }
 730
 731 /**
 732  * gfs2_rename - Rename a file
 733  * @odir: Parent directory of old file name
 734  * @odentry: The old dentry of the file
 735  * @ndir: Parent directory of new file name
 736  * @ndentry: The new dentry of the file
 737  *
 738  * Returns: errno
 739  */
 740
 741 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 742                        struct inode *ndir, struct dentry *ndentry)
 743 {
 744         struct gfs2_inode *odip = GFS2_I(odir);
 745         struct gfs2_inode *ndip = GFS2_I(ndir);
 746         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 747         struct gfs2_inode *nip = NULL;
 748         struct gfs2_sbd *sdp = GFS2_SB(odir);
 749         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
 750         struct gfs2_rgrpd *nrgd;
 751         unsigned int num_gh;
 752         int dir_rename = 0;
 753         int alloc_required;
 754         unsigned int x;
 755         int error;
 756
 757         if (ndentry->d_inode) {
 758                 nip = GFS2_I(ndentry->d_inode);
 759                 if (ip == nip)
 760                         return 0;
 761         }
 762
 763
 764         if (odip != ndip) {
 765                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
 766                                            0, &r_gh);
 767                 if (error)
 768                         goto out;
 769
 770                 if (S_ISDIR(ip->i_inode.i_mode)) {
 771                         dir_rename = 1;
 772                         /* don't move a dirctory into it's subdir */
 773                         error = gfs2_ok_to_move(ip, ndip);
 774                         if (error)
 775                                 goto out_gunlock_r;
 776                 }
 777         }
 778
 779         num_gh = 1;
 780         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 781         if (odip != ndip) {
 782                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 783                 num_gh++;
 784         }
 785         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 786         num_gh++;
 787
 788         if (nip) {
 789                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 790                 num_gh++;
 791                 /* grab the resource lock for unlink flag twiddling
 792                  * this is the case of the target file already existing
 793                  * so we unlink before doing the rename
 794                  */
 795                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
 796                 if (nrgd)
 797                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
 798         }
 799
 800         for (x = 0; x < num_gh; x++) {
 801                 error = gfs2_glock_nq(ghs + x);
 802                 if (error)
 803                         goto out_gunlock;
 804         }
 805
 806         /* Check out the old directory */
 807
 808         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 809         if (error)
 810                 goto out_gunlock;
 811
 812         /* Check out the new directory */
 813
 814         if (nip) {
 815                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 816                 if (error)
 817                         goto out_gunlock;
 818
 819                 if (S_ISDIR(nip->i_inode.i_mode)) {
 820                         if (nip->i_entries < 2) {
 821                                 if (gfs2_consist_inode(nip))
 822                                         gfs2_dinode_print(nip);
 823                                 error = -EIO;
 824                                 goto out_gunlock;
 825                         }
 826                         if (nip->i_entries > 2) {
 827                                 error = -ENOTEMPTY;
 828                                 goto out_gunlock;
 829                         }
 830                 }
 831         } else {
 832                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
 833                 if (error)
 834                         goto out_gunlock;
 835
 836                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
 837                 switch (error) {
 838                 case -ENOENT:
 839                         error = 0;
 840                         break;
 841                 case 0:
 842                         error = -EEXIST;
 843                 default:
 844                         goto out_gunlock;
 845                 };
 846
 847                 if (odip != ndip) {
 848                         if (!ndip->i_inode.i_nlink) {
 849                                 error = -EINVAL;
 850                                 goto out_gunlock;
 851                         }
 852                         if (ndip->i_entries == (u32)-1) {
 853                                 error = -EFBIG;
 854                                 goto out_gunlock;
 855                         }
 856                         if (S_ISDIR(ip->i_inode.i_mode) &&
 857                             ndip->i_inode.i_nlink == (u32)-1) {
 858                                 error = -EMLINK;
 859                                 goto out_gunlock;
 860                         }
 861                 }
 862         }
 863
 864         /* Check out the dir to be renamed */
 865
 866         if (dir_rename) {
 867                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
 868                 if (error)
 869                         goto out_gunlock;
 870         }
 871
 872         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 873         if (error < 0)
 874                 goto out_gunlock;
 875         error = 0;
 876
 877         if (alloc_required) {
 878                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 879                 if (!al) {
 880                         error = -ENOMEM;
 881                         goto out_gunlock;
 882                 }
 883
 884                 error = gfs2_quota_lock_check(ndip);
 885                 if (error)
 886                         goto out_alloc;
 887
 888                 al->al_requested = sdp->sd_max_dirres;
 889
 890                 error = gfs2_inplace_reserve(ndip);
 891                 if (error)
 892                         goto out_gunlock_q;
 893
 894                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 895                                          al->al_rgd->rd_length +
 896                                          4 * RES_DINODE + 4 * RES_LEAF +
 897                                          RES_STATFS + RES_QUOTA + 4, 0);
 898                 if (error)
 899                         goto out_ipreserv;
 900         } else {
 901                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 902                                          5 * RES_LEAF + 4, 0);
 903                 if (error)
 904                         goto out_gunlock;
 905         }
 906
 907         /* Remove the target file, if it exists */
 908
 909         if (nip) {
 910                 if (S_ISDIR(nip->i_inode.i_mode))
 911                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 912                 else {
 913                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 914                         if (error)
 915                                 goto out_end_trans;
 916                         error = gfs2_change_nlink(nip, -1);
 917                 }
 918                 if (error)
 919                         goto out_end_trans;
 920         }
 921
 922         if (dir_rename) {
 923                 struct qstr name;
 924                 gfs2_str2qstr(&name, "..");
 925
 926                 error = gfs2_change_nlink(ndip, +1);
 927                 if (error)
 928                         goto out_end_trans;
 929                 error = gfs2_change_nlink(odip, -1);
 930                 if (error)
 931                         goto out_end_trans;
 932
 933                 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
 934                 if (error)
 935                         goto out_end_trans;
 936         } else {
 937                 struct buffer_head *dibh;
 938                 error = gfs2_meta_inode_buffer(ip, &dibh);
 939                 if (error)
 940                         goto out_end_trans;
 941                 ip->i_inode.i_ctime = CURRENT_TIME;
 942                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 943                 gfs2_dinode_out(ip, dibh->b_data);
 944                 brelse(dibh);
 945         }
 946
 947         error = gfs2_dir_del(odip, &odentry->d_name);
 948         if (error)
 949                 goto out_end_trans;
 950
 951         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
 952         if (error)
 953                 goto out_end_trans;
 954
 955 out_end_trans:
 956         gfs2_trans_end(sdp);
 957 out_ipreserv:
 958         if (alloc_required)
 959                 gfs2_inplace_release(ndip);
 960 out_gunlock_q:
 961         if (alloc_required)
 962                 gfs2_quota_unlock(ndip);
 963 out_alloc:
 964         if (alloc_required)
 965                 gfs2_alloc_put(ndip);
 966 out_gunlock:
 967         while (x--) {
 968                 gfs2_glock_dq(ghs + x);
 969                 gfs2_holder_uninit(ghs + x);
 970         }
 971 out_gunlock_r:
 972         if (r_gh.gh_gl)
 973                 gfs2_glock_dq_uninit(&r_gh);
 974 out:
 975         return error;
 976 }
 977
 978 /**
 979  * gfs2_readlinki - return the contents of a symlink
 980  * @ip: the symlink's inode
 981  * @buf: a pointer to the buffer to be filled
 982  * @len: a pointer to the length of @buf
 983  *
 984  * If @buf is too small, a piece of memory is kmalloc()ed and needs
 985  * to be freed by the caller.
 986  *
 987  * Returns: errno
 988  */
 989
 990 static int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
 991 {
 992         struct gfs2_holder i_gh;
 993         struct buffer_head *dibh;
 994         unsigned int x;
 995         int error;
 996
 997         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
 998         error = gfs2_glock_nq(&i_gh);
 999         if (error) {
1000                 gfs2_holder_uninit(&i_gh);
1001                 return error;
1002         }
1003
1004         if (!ip->i_disksize) {
1005                 gfs2_consist_inode(ip);
1006                 error = -EIO;
1007                 goto out;
1008         }
1009
1010         error = gfs2_meta_inode_buffer(ip, &dibh);
1011         if (error)
1012                 goto out;
1013
1014         x = ip->i_disksize + 1;
1015         if (x > *len) {
1016                 *buf = kmalloc(x, GFP_NOFS);
1017                 if (!*buf) {
1018                         error = -ENOMEM;
1019                         goto out_brelse;
1020                 }
1021         }
1022
1023         memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1024         *len = x;
1025
1026 out_brelse:
1027         brelse(dibh);
1028 out:
1029         gfs2_glock_dq_uninit(&i_gh);
1030         return error;
1031 }
1032
1033 /**
1034  * gfs2_readlink - Read the value of a symlink
1035  * @dentry: the symlink
1036  * @buf: the buffer to read the symlink data into
1037  * @size: the size of the buffer
1038  *
1039  * Returns: errno
1040  */
1041
1042 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
1043                          int user_size)
1044 {
1045         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1046         char array[GFS2_FAST_NAME_SIZE], *buf = array;
1047         unsigned int len = GFS2_FAST_NAME_SIZE;
1048         int error;
1049
1050         error = gfs2_readlinki(ip, &buf, &len);
1051         if (error)
1052                 return error;
1053
1054         if (user_size > len - 1)
1055                 user_size = len - 1;
1056
1057         if (copy_to_user(user_buf, buf, user_size))
1058                 error = -EFAULT;
1059         else
1060                 error = user_size;
1061
1062         if (buf != array)
1063                 kfree(buf);
1064
1065         return error;
1066 }
1067
1068 /**
1069  * gfs2_follow_link - Follow a symbolic link
1070  * @dentry: The dentry of the link
1071  * @nd: Data that we pass to vfs_follow_link()
1072  *
1073  * This can handle symlinks of any size. It is optimised for symlinks
1074  * under GFS2_FAST_NAME_SIZE.
1075  *
1076  * Returns: 0 on success or error code
1077  */
1078
1079 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1080 {
1081         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1082         char array[GFS2_FAST_NAME_SIZE], *buf = array;
1083         unsigned int len = GFS2_FAST_NAME_SIZE;
1084         int error;
1085
1086         error = gfs2_readlinki(ip, &buf, &len);
1087         if (!error) {
1088                 error = vfs_follow_link(nd, buf);
1089                 if (buf != array)
1090                         kfree(buf);
1091         }
1092
1093         return ERR_PTR(error);
1094 }
1095
1096 /**
1097  * gfs2_permission -
1098  * @inode:
1099  * @mask:
1100  * @nd: passed from Linux VFS, ignored by us
1101  *
1102  * This may be called from the VFS directly, or from within GFS2 with the
1103  * inode locked, so we look to see if the glock is already locked and only
1104  * lock the glock if its not already been done.
1105  *
1106  * Returns: errno
1107  */
1108
1109 int gfs2_permission(struct inode *inode, int mask)
1110 {
1111         struct gfs2_inode *ip = GFS2_I(inode);
1112         struct gfs2_holder i_gh;
1113         int error;
1114         int unlock = 0;
1115
1116         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1117                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1118                 if (error)
1119                         return error;
1120                 unlock = 1;
1121         }
1122
1123         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1124                 error = -EACCES;
1125         else
1126                 error = generic_permission(inode, mask, gfs2_check_acl);
1127         if (unlock)
1128                 gfs2_glock_dq_uninit(&i_gh);
1129
1130         return error;
1131 }
1132
1133 static int setattr_size(struct inode *inode, struct iattr *attr)
1134 {
1135         struct gfs2_inode *ip = GFS2_I(inode);
1136         struct gfs2_sbd *sdp = GFS2_SB(inode);
1137         int error;
1138
1139         if (attr->ia_size != ip->i_disksize) {
1140                 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1141                 if (error)
1142                         return error;
1143                 error = vmtruncate(inode, attr->ia_size);
1144                 gfs2_trans_end(sdp);
1145                 if (error)
1146                         return error;
1147         }
1148
1149         error = gfs2_truncatei(ip, attr->ia_size);
1150         if (error && (inode->i_size != ip->i_disksize))
1151                 i_size_write(inode, ip->i_disksize);
1152
1153         return error;
1154 }
1155
1156 static int setattr_chown(struct inode *inode, struct iattr *attr)
1157 {
1158         struct gfs2_inode *ip = GFS2_I(inode);
1159         struct gfs2_sbd *sdp = GFS2_SB(inode);
1160         struct buffer_head *dibh;
1161         u32 ouid, ogid, nuid, ngid;
1162         int error;
1163
1164         ouid = inode->i_uid;
1165         ogid = inode->i_gid;
1166         nuid = attr->ia_uid;
1167         ngid = attr->ia_gid;
1168
1169         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1170                 ouid = nuid = NO_QUOTA_CHANGE;
1171         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1172                 ogid = ngid = NO_QUOTA_CHANGE;
1173
1174         if (!gfs2_alloc_get(ip))
1175                 return -ENOMEM;
1176
1177         error = gfs2_quota_lock(ip, nuid, ngid);
1178         if (error)
1179                 goto out_alloc;
1180
1181         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1182                 error = gfs2_quota_check(ip, nuid, ngid);
1183                 if (error)
1184                         goto out_gunlock_q;
1185         }
1186
1187         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1188         if (error)
1189                 goto out_gunlock_q;
1190
1191         error = gfs2_meta_inode_buffer(ip, &dibh);
1192         if (error)
1193                 goto out_end_trans;
1194
1195         error = inode_setattr(inode, attr);
1196         gfs2_assert_warn(sdp, !error);
1197
1198         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1199         gfs2_dinode_out(ip, dibh->b_data);
1200         brelse(dibh);
1201
1202         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1203                 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1204                 gfs2_quota_change(ip, -blocks, ouid, ogid);
1205                 gfs2_quota_change(ip, blocks, nuid, ngid);
1206         }
1207
1208 out_end_trans:
1209         gfs2_trans_end(sdp);
1210 out_gunlock_q:
1211         gfs2_quota_unlock(ip);
1212 out_alloc:
1213         gfs2_alloc_put(ip);
1214         return error;
1215 }
1216
1217 /**
1218  * gfs2_setattr - Change attributes on an inode
1219  * @dentry: The dentry which is changing
1220  * @attr: The structure describing the change
1221  *
1222  * The VFS layer wants to change one or more of an inodes attributes.  Write
1223  * that change out to disk.
1224  *
1225  * Returns: errno
1226  */
1227
1228 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1229 {
1230         struct inode *inode = dentry->d_inode;
1231         struct gfs2_inode *ip = GFS2_I(inode);
1232         struct gfs2_holder i_gh;
1233         int error;
1234
1235         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1236         if (error)
1237                 return error;
1238
1239         error = -EPERM;
1240         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1241                 goto out;
1242
1243         error = inode_change_ok(inode, attr);
1244         if (error)
1245                 goto out;
1246
1247         if (attr->ia_valid & ATTR_SIZE)
1248                 error = setattr_size(inode, attr);
1249         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1250                 error = setattr_chown(inode, attr);
1251         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1252                 error = gfs2_acl_chmod(ip, attr);
1253         else
1254                 error = gfs2_setattr_simple(ip, attr);
1255
1256 out:
1257         gfs2_glock_dq_uninit(&i_gh);
1258         if (!error)
1259                 mark_inode_dirty(inode);
1260         return error;
1261 }
1262
1263 /**
1264  * gfs2_getattr - Read out an inode's attributes
1265  * @mnt: The vfsmount the inode is being accessed from
1266  * @dentry: The dentry to stat
1267  * @stat: The inode's stats
1268  *
1269  * This may be called from the VFS directly, or from within GFS2 with the
1270  * inode locked, so we look to see if the glock is already locked and only
1271  * lock the glock if its not already been done. Note that its the NFS
1272  * readdirplus operation which causes this to be called (from filldir)
1273  * with the glock already held.
1274  *
1275  * Returns: errno
1276  */
1277
1278 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1279                         struct kstat *stat)
1280 {
1281         struct inode *inode = dentry->d_inode;
1282         struct gfs2_inode *ip = GFS2_I(inode);
1283         struct gfs2_holder gh;
1284         int error;
1285         int unlock = 0;
1286
1287         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1288                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1289                 if (error)
1290                         return error;
1291                 unlock = 1;
1292         }
1293
1294         generic_fillattr(inode, stat);
1295         if (unlock)
1296                 gfs2_glock_dq_uninit(&gh);
1297
1298         return 0;
1299 }
1300
1301 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1302                          const void *data, size_t size, int flags)
1303 {
1304         struct inode *inode = dentry->d_inode;
1305         struct gfs2_ea_request er;
1306
1307         memset(&er, 0, sizeof(struct gfs2_ea_request));
1308         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1309         if (er.er_type == GFS2_EATYPE_UNUSED)
1310                 return -EOPNOTSUPP;
1311         er.er_data = (char *)data;
1312         er.er_name_len = strlen(er.er_name);
1313         er.er_data_len = size;
1314         er.er_flags = flags;
1315
1316         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1317
1318         return gfs2_ea_set(GFS2_I(inode), &er);
1319 }
1320
1321 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1322                              void *data, size_t size)
1323 {
1324         struct gfs2_ea_request er;
1325
1326         memset(&er, 0, sizeof(struct gfs2_ea_request));
1327         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1328         if (er.er_type == GFS2_EATYPE_UNUSED)
1329                 return -EOPNOTSUPP;
1330         er.er_data = data;
1331         er.er_name_len = strlen(er.er_name);
1332         er.er_data_len = size;
1333
1334         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1335 }
1336
1337 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1338 {
1339         struct gfs2_ea_request er;
1340
1341         memset(&er, 0, sizeof(struct gfs2_ea_request));
1342         er.er_data = (size) ? buffer : NULL;
1343         er.er_data_len = size;
1344
1345         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1346 }
1347
1348 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1349 {
1350         struct gfs2_ea_request er;
1351
1352         memset(&er, 0, sizeof(struct gfs2_ea_request));
1353         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1354         if (er.er_type == GFS2_EATYPE_UNUSED)
1355                 return -EOPNOTSUPP;
1356         er.er_name_len = strlen(er.er_name);
1357
1358         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1359 }
1360
1361 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1362                        u64 start, u64 len)
1363 {
1364         struct gfs2_inode *ip = GFS2_I(inode);
1365         struct gfs2_holder gh;
1366         int ret;
1367
1368         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1369         if (ret)
1370                 return ret;
1371
1372         mutex_lock(&inode->i_mutex);
1373
1374         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1375         if (ret)
1376                 goto out;
1377
1378         if (gfs2_is_stuffed(ip)) {
1379                 u64 phys = ip->i_no_addr << inode->i_blkbits;
1380                 u64 size = i_size_read(inode);
1381                 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1382                             FIEMAP_EXTENT_DATA_INLINE;
1383                 phys += sizeof(struct gfs2_dinode);
1384                 phys += start;
1385                 if (start + len > size)
1386                         len = size - start;
1387                 if (start < size)
1388                         ret = fiemap_fill_next_extent(fieinfo, start, phys,
1389                                                       len, flags);
1390                 if (ret == 1)
1391                         ret = 0;
1392         } else {
1393                 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1394                                              gfs2_block_map);
1395         }
1396
1397         gfs2_glock_dq_uninit(&gh);
1398 out:
1399         mutex_unlock(&inode->i_mutex);
1400         return ret;
1401 }
1402
1403 const struct inode_operations gfs2_file_iops = {
1404         .permission = gfs2_permission,
1405         .setattr = gfs2_setattr,
1406         .getattr = gfs2_getattr,
1407         .setxattr = gfs2_setxattr,
1408         .getxattr = gfs2_getxattr,
1409         .listxattr = gfs2_listxattr,
1410         .removexattr = gfs2_removexattr,
1411         .fiemap = gfs2_fiemap,
1412 };
1413
1414 const struct inode_operations gfs2_dir_iops = {
1415         .create = gfs2_create,
1416         .lookup = gfs2_lookup,
1417         .link = gfs2_link,
1418         .unlink = gfs2_unlink,
1419         .symlink = gfs2_symlink,
1420         .mkdir = gfs2_mkdir,
1421         .rmdir = gfs2_rmdir,
1422         .mknod = gfs2_mknod,
1423         .rename = gfs2_rename,
1424         .permission = gfs2_permission,
1425         .setattr = gfs2_setattr,
1426         .getattr = gfs2_getattr,
1427         .setxattr = gfs2_setxattr,
1428         .getxattr = gfs2_getxattr,
1429         .listxattr = gfs2_listxattr,
1430         .removexattr = gfs2_removexattr,
1431         .fiemap = gfs2_fiemap,
1432 };
1433
1434 const struct inode_operations gfs2_symlink_iops = {
1435         .readlink = gfs2_readlink,
1436         .follow_link = gfs2_follow_link,
1437         .permission = gfs2_permission,
1438         .setattr = gfs2_setattr,
1439         .getattr = gfs2_getattr,
1440         .setxattr = gfs2_setxattr,
1441         .getxattr = gfs2_getxattr,
1442         .listxattr = gfs2_listxattr,
1443         .removexattr = gfs2_removexattr,
1444         .fiemap = gfs2_fiemap,
1445 };
1446