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