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 - Unlink a file
 267  * @dir: The inode of the directory containing the file to unlink
 268  * @dentry: The file itself
 269  *
 270  * Unlink a file.  Call gfs2_unlinki()
 271  *
 272  * Returns: errno
 273  */
 274
 275 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 276 {
 277         struct gfs2_inode *dip = GFS2_I(dir);
 278         struct gfs2_sbd *sdp = GFS2_SB(dir);
 279         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 280         struct gfs2_holder ghs[3];
 281         struct gfs2_rgrpd *rgd;
 282         struct gfs2_holder ri_gh;
 283         int error;
 284
 285         error = gfs2_rindex_hold(sdp, &ri_gh);
 286         if (error)
 287                 return error;
 288
 289         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 290         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
 291
 292         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 293         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 294
 295
 296         error = gfs2_glock_nq(ghs); /* parent */
 297         if (error)
 298                 goto out_parent;
 299
 300         error = gfs2_glock_nq(ghs + 1); /* child */
 301         if (error)
 302                 goto out_child;
 303
 304         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 305         if (error)
 306                 goto out_rgrp;
 307
 308         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 309         if (error)
 310                 goto out_gunlock;
 311
 312         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 313         if (error)
 314                 goto out_rgrp;
 315
 316         error = gfs2_dir_del(dip, &dentry->d_name);
 317         if (error)
 318                 goto out_end_trans;
 319
 320         error = gfs2_change_nlink(ip, -1);
 321
 322 out_end_trans:
 323         gfs2_trans_end(sdp);
 324 out_gunlock:
 325         gfs2_glock_dq(ghs + 2);
 326 out_rgrp:
 327         gfs2_holder_uninit(ghs + 2);
 328         gfs2_glock_dq(ghs + 1);
 329 out_child:
 330         gfs2_holder_uninit(ghs + 1);
 331         gfs2_glock_dq(ghs);
 332 out_parent:
 333         gfs2_holder_uninit(ghs);
 334         gfs2_glock_dq_uninit(&ri_gh);
 335         return error;
 336 }
 337
 338 /**
 339  * gfs2_symlink - Create a symlink
 340  * @dir: The directory to create the symlink in
 341  * @dentry: The dentry to put the symlink in
 342  * @symname: The thing which the link points to
 343  *
 344  * Returns: errno
 345  */
 346
 347 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 348                         const char *symname)
 349 {
 350         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 351         struct gfs2_sbd *sdp = GFS2_SB(dir);
 352         struct gfs2_holder ghs[2];
 353         struct inode *inode;
 354         struct buffer_head *dibh;
 355         int size;
 356         int error;
 357
 358         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 359         size = strlen(symname);
 360         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 361                 return -ENAMETOOLONG;
 362
 363         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 364
 365         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 366         if (IS_ERR(inode)) {
 367                 gfs2_holder_uninit(ghs);
 368                 return PTR_ERR(inode);
 369         }
 370
 371         ip = ghs[1].gh_gl->gl_object;
 372
 373         ip->i_disksize = size;
 374
 375         error = gfs2_meta_inode_buffer(ip, &dibh);
 376
 377         if (!gfs2_assert_withdraw(sdp, !error)) {
 378                 gfs2_dinode_out(ip, dibh->b_data);
 379                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 380                        size);
 381                 brelse(dibh);
 382         }
 383
 384         gfs2_trans_end(sdp);
 385         if (dip->i_alloc->al_rgd)
 386                 gfs2_inplace_release(dip);
 387         gfs2_quota_unlock(dip);
 388         gfs2_alloc_put(dip);
 389
 390         gfs2_glock_dq_uninit_m(2, ghs);
 391
 392         d_instantiate(dentry, inode);
 393         mark_inode_dirty(inode);
 394
 395         return 0;
 396 }
 397
 398 /**
 399  * gfs2_mkdir - Make a directory
 400  * @dir: The parent directory of the new one
 401  * @dentry: The dentry of the new directory
 402  * @mode: The mode of the new directory
 403  *
 404  * Returns: errno
 405  */
 406
 407 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 408 {
 409         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 410         struct gfs2_sbd *sdp = GFS2_SB(dir);
 411         struct gfs2_holder ghs[2];
 412         struct inode *inode;
 413         struct buffer_head *dibh;
 414         int error;
 415
 416         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 417
 418         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 419         if (IS_ERR(inode)) {
 420                 gfs2_holder_uninit(ghs);
 421                 return PTR_ERR(inode);
 422         }
 423
 424         ip = ghs[1].gh_gl->gl_object;
 425
 426         ip->i_inode.i_nlink = 2;
 427         ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 428         ip->i_diskflags |= GFS2_DIF_JDATA;
 429         ip->i_entries = 2;
 430
 431         error = gfs2_meta_inode_buffer(ip, &dibh);
 432
 433         if (!gfs2_assert_withdraw(sdp, !error)) {
 434                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 435                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 436                 struct qstr str;
 437
 438                 gfs2_str2qstr(&str, ".");
 439                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 440                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 441                 dent->de_inum = di->di_num; /* already GFS2 endian */
 442                 dent->de_type = cpu_to_be16(DT_DIR);
 443                 di->di_entries = cpu_to_be32(1);
 444
 445                 gfs2_str2qstr(&str, "..");
 446                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 447                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 448
 449                 gfs2_inum_out(dip, dent);
 450                 dent->de_type = cpu_to_be16(DT_DIR);
 451
 452                 gfs2_dinode_out(ip, di);
 453
 454                 brelse(dibh);
 455         }
 456
 457         error = gfs2_change_nlink(dip, +1);
 458         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 459
 460         gfs2_trans_end(sdp);
 461         if (dip->i_alloc->al_rgd)
 462                 gfs2_inplace_release(dip);
 463         gfs2_quota_unlock(dip);
 464         gfs2_alloc_put(dip);
 465
 466         gfs2_glock_dq_uninit_m(2, ghs);
 467
 468         d_instantiate(dentry, inode);
 469         mark_inode_dirty(inode);
 470
 471         return 0;
 472 }
 473
 474 /**
 475  * gfs2_rmdir - Remove a directory
 476  * @dir: The parent directory of the directory to be removed
 477  * @dentry: The dentry of the directory to remove
 478  *
 479  * Remove a directory. Call gfs2_rmdiri()
 480  *
 481  * Returns: errno
 482  */
 483
 484 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 485 {
 486         struct gfs2_inode *dip = GFS2_I(dir);
 487         struct gfs2_sbd *sdp = GFS2_SB(dir);
 488         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 489         struct gfs2_holder ghs[3];
 490         struct gfs2_rgrpd *rgd;
 491         struct gfs2_holder ri_gh;
 492         int error;
 493
 494         error = gfs2_rindex_hold(sdp, &ri_gh);
 495         if (error)
 496                 return error;
 497         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 498         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 499
 500         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 501         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 502
 503         error = gfs2_glock_nq(ghs); /* parent */
 504         if (error)
 505                 goto out_parent;
 506
 507         error = gfs2_glock_nq(ghs + 1); /* child */
 508         if (error)
 509                 goto out_child;
 510
 511         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 512         if (error)
 513                 goto out_rgrp;
 514
 515         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 516         if (error)
 517                 goto out_gunlock;
 518
 519         if (ip->i_entries < 2) {
 520                 if (gfs2_consist_inode(ip))
 521                         gfs2_dinode_print(ip);
 522                 error = -EIO;
 523                 goto out_gunlock;
 524         }
 525         if (ip->i_entries > 2) {
 526                 error = -ENOTEMPTY;
 527                 goto out_gunlock;
 528         }
 529
 530         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 531         if (error)
 532                 goto out_gunlock;
 533
 534         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 535
 536         gfs2_trans_end(sdp);
 537
 538 out_gunlock:
 539         gfs2_glock_dq(ghs + 2);
 540 out_rgrp:
 541         gfs2_holder_uninit(ghs + 2);
 542         gfs2_glock_dq(ghs + 1);
 543 out_child:
 544         gfs2_holder_uninit(ghs + 1);
 545         gfs2_glock_dq(ghs);
 546 out_parent:
 547         gfs2_holder_uninit(ghs);
 548         gfs2_glock_dq_uninit(&ri_gh);
 549         return error;
 550 }
 551
 552 /**
 553  * gfs2_mknod - Make a special file
 554  * @dir: The directory in which the special file will reside
 555  * @dentry: The dentry of the special file
 556  * @mode: The mode of the special file
 557  * @rdev: The device specification of the special file
 558  *
 559  */
 560
 561 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 562                       dev_t dev)
 563 {
 564         struct gfs2_inode *dip = GFS2_I(dir);
 565         struct gfs2_sbd *sdp = GFS2_SB(dir);
 566         struct gfs2_holder ghs[2];
 567         struct inode *inode;
 568
 569         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 570
 571         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 572         if (IS_ERR(inode)) {
 573                 gfs2_holder_uninit(ghs);
 574                 return PTR_ERR(inode);
 575         }
 576
 577         gfs2_trans_end(sdp);
 578         if (dip->i_alloc->al_rgd)
 579                 gfs2_inplace_release(dip);
 580         gfs2_quota_unlock(dip);
 581         gfs2_alloc_put(dip);
 582
 583         gfs2_glock_dq_uninit_m(2, ghs);
 584
 585         d_instantiate(dentry, inode);
 586         mark_inode_dirty(inode);
 587
 588         return 0;
 589 }
 590
 591 /*
 592  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
 593  * @this: move this
 594  * @to: to here
 595  *
 596  * Follow @to back to the root and make sure we don't encounter @this
 597  * Assumes we already hold the rename lock.
 598  *
 599  * Returns: errno
 600  */
 601
 602 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
 603 {
 604         struct inode *dir = &to->i_inode;
 605         struct super_block *sb = dir->i_sb;
 606         struct inode *tmp;
 607         struct qstr dotdot;
 608         int error = 0;
 609
 610         gfs2_str2qstr(&dotdot, "..");
 611
 612         igrab(dir);
 613
 614         for (;;) {
 615                 if (dir == &this->i_inode) {
 616                         error = -EINVAL;
 617                         break;
 618                 }
 619                 if (dir == sb->s_root->d_inode) {
 620                         error = 0;
 621                         break;
 622                 }
 623
 624                 tmp = gfs2_lookupi(dir, &dotdot, 1);
 625                 if (IS_ERR(tmp)) {
 626                         error = PTR_ERR(tmp);
 627                         break;
 628                 }
 629
 630                 iput(dir);
 631                 dir = tmp;
 632         }
 633
 634         iput(dir);
 635
 636         return error;
 637 }
 638
 639 /**
 640  * gfs2_rename - Rename a file
 641  * @odir: Parent directory of old file name
 642  * @odentry: The old dentry of the file
 643  * @ndir: Parent directory of new file name
 644  * @ndentry: The new dentry of the file
 645  *
 646  * Returns: errno
 647  */
 648
 649 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 650                        struct inode *ndir, struct dentry *ndentry)
 651 {
 652         struct gfs2_inode *odip = GFS2_I(odir);
 653         struct gfs2_inode *ndip = GFS2_I(ndir);
 654         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 655         struct gfs2_inode *nip = NULL;
 656         struct gfs2_sbd *sdp = GFS2_SB(odir);
 657         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
 658         struct gfs2_rgrpd *nrgd;
 659         unsigned int num_gh;
 660         int dir_rename = 0;
 661         int alloc_required;
 662         unsigned int x;
 663         int error;
 664
 665         if (ndentry->d_inode) {
 666                 nip = GFS2_I(ndentry->d_inode);
 667                 if (ip == nip)
 668                         return 0;
 669         }
 670
 671
 672         if (odip != ndip) {
 673                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
 674                                            0, &r_gh);
 675                 if (error)
 676                         goto out;
 677
 678                 if (S_ISDIR(ip->i_inode.i_mode)) {
 679                         dir_rename = 1;
 680                         /* don't move a dirctory into it's subdir */
 681                         error = gfs2_ok_to_move(ip, ndip);
 682                         if (error)
 683                                 goto out_gunlock_r;
 684                 }
 685         }
 686
 687         num_gh = 1;
 688         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 689         if (odip != ndip) {
 690                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 691                 num_gh++;
 692         }
 693         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 694         num_gh++;
 695
 696         if (nip) {
 697                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 698                 num_gh++;
 699                 /* grab the resource lock for unlink flag twiddling
 700                  * this is the case of the target file already existing
 701                  * so we unlink before doing the rename
 702                  */
 703                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
 704                 if (nrgd)
 705                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
 706         }
 707
 708         for (x = 0; x < num_gh; x++) {
 709                 error = gfs2_glock_nq(ghs + x);
 710                 if (error)
 711                         goto out_gunlock;
 712         }
 713
 714         /* Check out the old directory */
 715
 716         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 717         if (error)
 718                 goto out_gunlock;
 719
 720         /* Check out the new directory */
 721
 722         if (nip) {
 723                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 724                 if (error)
 725                         goto out_gunlock;
 726
 727                 if (S_ISDIR(nip->i_inode.i_mode)) {
 728                         if (nip->i_entries < 2) {
 729                                 if (gfs2_consist_inode(nip))
 730                                         gfs2_dinode_print(nip);
 731                                 error = -EIO;
 732                                 goto out_gunlock;
 733                         }
 734                         if (nip->i_entries > 2) {
 735                                 error = -ENOTEMPTY;
 736                                 goto out_gunlock;
 737                         }
 738                 }
 739         } else {
 740                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
 741                 if (error)
 742                         goto out_gunlock;
 743
 744                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
 745                 switch (error) {
 746                 case -ENOENT:
 747                         error = 0;
 748                         break;
 749                 case 0:
 750                         error = -EEXIST;
 751                 default:
 752                         goto out_gunlock;
 753                 };
 754
 755                 if (odip != ndip) {
 756                         if (!ndip->i_inode.i_nlink) {
 757                                 error = -EINVAL;
 758                                 goto out_gunlock;
 759                         }
 760                         if (ndip->i_entries == (u32)-1) {
 761                                 error = -EFBIG;
 762                                 goto out_gunlock;
 763                         }
 764                         if (S_ISDIR(ip->i_inode.i_mode) &&
 765                             ndip->i_inode.i_nlink == (u32)-1) {
 766                                 error = -EMLINK;
 767                                 goto out_gunlock;
 768                         }
 769                 }
 770         }
 771
 772         /* Check out the dir to be renamed */
 773
 774         if (dir_rename) {
 775                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
 776                 if (error)
 777                         goto out_gunlock;
 778         }
 779
 780         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 781         if (error < 0)
 782                 goto out_gunlock;
 783         error = 0;
 784
 785         if (alloc_required) {
 786                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 787                 if (!al) {
 788                         error = -ENOMEM;
 789                         goto out_gunlock;
 790                 }
 791
 792                 error = gfs2_quota_lock_check(ndip);
 793                 if (error)
 794                         goto out_alloc;
 795
 796                 al->al_requested = sdp->sd_max_dirres;
 797
 798                 error = gfs2_inplace_reserve(ndip);
 799                 if (error)
 800                         goto out_gunlock_q;
 801
 802                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 803                                          al->al_rgd->rd_length +
 804                                          4 * RES_DINODE + 4 * RES_LEAF +
 805                                          RES_STATFS + RES_QUOTA + 4, 0);
 806                 if (error)
 807                         goto out_ipreserv;
 808         } else {
 809                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 810                                          5 * RES_LEAF + 4, 0);
 811                 if (error)
 812                         goto out_gunlock;
 813         }
 814
 815         /* Remove the target file, if it exists */
 816
 817         if (nip) {
 818                 if (S_ISDIR(nip->i_inode.i_mode))
 819                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 820                 else {
 821                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 822                         if (error)
 823                                 goto out_end_trans;
 824                         error = gfs2_change_nlink(nip, -1);
 825                 }
 826                 if (error)
 827                         goto out_end_trans;
 828         }
 829
 830         if (dir_rename) {
 831                 struct qstr name;
 832                 gfs2_str2qstr(&name, "..");
 833
 834                 error = gfs2_change_nlink(ndip, +1);
 835                 if (error)
 836                         goto out_end_trans;
 837                 error = gfs2_change_nlink(odip, -1);
 838                 if (error)
 839                         goto out_end_trans;
 840
 841                 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
 842                 if (error)
 843                         goto out_end_trans;
 844         } else {
 845                 struct buffer_head *dibh;
 846                 error = gfs2_meta_inode_buffer(ip, &dibh);
 847                 if (error)
 848                         goto out_end_trans;
 849                 ip->i_inode.i_ctime = CURRENT_TIME;
 850                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 851                 gfs2_dinode_out(ip, dibh->b_data);
 852                 brelse(dibh);
 853         }
 854
 855         error = gfs2_dir_del(odip, &odentry->d_name);
 856         if (error)
 857                 goto out_end_trans;
 858
 859         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
 860         if (error)
 861                 goto out_end_trans;
 862
 863 out_end_trans:
 864         gfs2_trans_end(sdp);
 865 out_ipreserv:
 866         if (alloc_required)
 867                 gfs2_inplace_release(ndip);
 868 out_gunlock_q:
 869         if (alloc_required)
 870                 gfs2_quota_unlock(ndip);
 871 out_alloc:
 872         if (alloc_required)
 873                 gfs2_alloc_put(ndip);
 874 out_gunlock:
 875         while (x--) {
 876                 gfs2_glock_dq(ghs + x);
 877                 gfs2_holder_uninit(ghs + x);
 878         }
 879 out_gunlock_r:
 880         if (r_gh.gh_gl)
 881                 gfs2_glock_dq_uninit(&r_gh);
 882 out:
 883         return error;
 884 }
 885
 886 /**
 887  * gfs2_readlink - Read the value of a symlink
 888  * @dentry: the symlink
 889  * @buf: the buffer to read the symlink data into
 890  * @size: the size of the buffer
 891  *
 892  * Returns: errno
 893  */
 894
 895 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 896                          int user_size)
 897 {
 898         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 899         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 900         unsigned int len = GFS2_FAST_NAME_SIZE;
 901         int error;
 902
 903         error = gfs2_readlinki(ip, &buf, &len);
 904         if (error)
 905                 return error;
 906
 907         if (user_size > len - 1)
 908                 user_size = len - 1;
 909
 910         if (copy_to_user(user_buf, buf, user_size))
 911                 error = -EFAULT;
 912         else
 913                 error = user_size;
 914
 915         if (buf != array)
 916                 kfree(buf);
 917
 918         return error;
 919 }
 920
 921 /**
 922  * gfs2_follow_link - Follow a symbolic link
 923  * @dentry: The dentry of the link
 924  * @nd: Data that we pass to vfs_follow_link()
 925  *
 926  * This can handle symlinks of any size. It is optimised for symlinks
 927  * under GFS2_FAST_NAME_SIZE.
 928  *
 929  * Returns: 0 on success or error code
 930  */
 931
 932 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 933 {
 934         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 935         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 936         unsigned int len = GFS2_FAST_NAME_SIZE;
 937         int error;
 938
 939         error = gfs2_readlinki(ip, &buf, &len);
 940         if (!error) {
 941                 error = vfs_follow_link(nd, buf);
 942                 if (buf != array)
 943                         kfree(buf);
 944         }
 945
 946         return ERR_PTR(error);
 947 }
 948
 949 /**
 950  * gfs2_permission -
 951  * @inode:
 952  * @mask:
 953  * @nd: passed from Linux VFS, ignored by us
 954  *
 955  * This may be called from the VFS directly, or from within GFS2 with the
 956  * inode locked, so we look to see if the glock is already locked and only
 957  * lock the glock if its not already been done.
 958  *
 959  * Returns: errno
 960  */
 961
 962 int gfs2_permission(struct inode *inode, int mask)
 963 {
 964         struct gfs2_inode *ip = GFS2_I(inode);
 965         struct gfs2_holder i_gh;
 966         int error;
 967         int unlock = 0;
 968
 969         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
 970                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 971                 if (error)
 972                         return error;
 973                 unlock = 1;
 974         }
 975
 976         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
 977                 error = -EACCES;
 978         else
 979                 error = generic_permission(inode, mask, gfs2_check_acl);
 980         if (unlock)
 981                 gfs2_glock_dq_uninit(&i_gh);
 982
 983         return error;
 984 }
 985
 986 static int setattr_size(struct inode *inode, struct iattr *attr)
 987 {
 988         struct gfs2_inode *ip = GFS2_I(inode);
 989         struct gfs2_sbd *sdp = GFS2_SB(inode);
 990         int error;
 991
 992         if (attr->ia_size != ip->i_disksize) {
 993                 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
 994                 if (error)
 995                         return error;
 996                 error = vmtruncate(inode, attr->ia_size);
 997                 gfs2_trans_end(sdp);
 998                 if (error)
 999                         return error;
1000         }
1001
1002         error = gfs2_truncatei(ip, attr->ia_size);
1003         if (error && (inode->i_size != ip->i_disksize))
1004                 i_size_write(inode, ip->i_disksize);
1005
1006         return error;
1007 }
1008
1009 static int setattr_chown(struct inode *inode, struct iattr *attr)
1010 {
1011         struct gfs2_inode *ip = GFS2_I(inode);
1012         struct gfs2_sbd *sdp = GFS2_SB(inode);
1013         struct buffer_head *dibh;
1014         u32 ouid, ogid, nuid, ngid;
1015         int error;
1016
1017         ouid = inode->i_uid;
1018         ogid = inode->i_gid;
1019         nuid = attr->ia_uid;
1020         ngid = attr->ia_gid;
1021
1022         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1023                 ouid = nuid = NO_QUOTA_CHANGE;
1024         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1025                 ogid = ngid = NO_QUOTA_CHANGE;
1026
1027         if (!gfs2_alloc_get(ip))
1028                 return -ENOMEM;
1029
1030         error = gfs2_quota_lock(ip, nuid, ngid);
1031         if (error)
1032                 goto out_alloc;
1033
1034         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1035                 error = gfs2_quota_check(ip, nuid, ngid);
1036                 if (error)
1037                         goto out_gunlock_q;
1038         }
1039
1040         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1041         if (error)
1042                 goto out_gunlock_q;
1043
1044         error = gfs2_meta_inode_buffer(ip, &dibh);
1045         if (error)
1046                 goto out_end_trans;
1047
1048         error = inode_setattr(inode, attr);
1049         gfs2_assert_warn(sdp, !error);
1050
1051         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1052         gfs2_dinode_out(ip, dibh->b_data);
1053         brelse(dibh);
1054
1055         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1056                 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1057                 gfs2_quota_change(ip, -blocks, ouid, ogid);
1058                 gfs2_quota_change(ip, blocks, nuid, ngid);
1059         }
1060
1061 out_end_trans:
1062         gfs2_trans_end(sdp);
1063 out_gunlock_q:
1064         gfs2_quota_unlock(ip);
1065 out_alloc:
1066         gfs2_alloc_put(ip);
1067         return error;
1068 }
1069
1070 /**
1071  * gfs2_setattr - Change attributes on an inode
1072  * @dentry: The dentry which is changing
1073  * @attr: The structure describing the change
1074  *
1075  * The VFS layer wants to change one or more of an inodes attributes.  Write
1076  * that change out to disk.
1077  *
1078  * Returns: errno
1079  */
1080
1081 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1082 {
1083         struct inode *inode = dentry->d_inode;
1084         struct gfs2_inode *ip = GFS2_I(inode);
1085         struct gfs2_holder i_gh;
1086         int error;
1087
1088         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1089         if (error)
1090                 return error;
1091
1092         error = -EPERM;
1093         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1094                 goto out;
1095
1096         error = inode_change_ok(inode, attr);
1097         if (error)
1098                 goto out;
1099
1100         if (attr->ia_valid & ATTR_SIZE)
1101                 error = setattr_size(inode, attr);
1102         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1103                 error = setattr_chown(inode, attr);
1104         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1105                 error = gfs2_acl_chmod(ip, attr);
1106         else
1107                 error = gfs2_setattr_simple(ip, attr);
1108
1109 out:
1110         gfs2_glock_dq_uninit(&i_gh);
1111         if (!error)
1112                 mark_inode_dirty(inode);
1113         return error;
1114 }
1115
1116 /**
1117  * gfs2_getattr - Read out an inode's attributes
1118  * @mnt: The vfsmount the inode is being accessed from
1119  * @dentry: The dentry to stat
1120  * @stat: The inode's stats
1121  *
1122  * This may be called from the VFS directly, or from within GFS2 with the
1123  * inode locked, so we look to see if the glock is already locked and only
1124  * lock the glock if its not already been done. Note that its the NFS
1125  * readdirplus operation which causes this to be called (from filldir)
1126  * with the glock already held.
1127  *
1128  * Returns: errno
1129  */
1130
1131 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1132                         struct kstat *stat)
1133 {
1134         struct inode *inode = dentry->d_inode;
1135         struct gfs2_inode *ip = GFS2_I(inode);
1136         struct gfs2_holder gh;
1137         int error;
1138         int unlock = 0;
1139
1140         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1141                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1142                 if (error)
1143                         return error;
1144                 unlock = 1;
1145         }
1146
1147         generic_fillattr(inode, stat);
1148         if (unlock)
1149                 gfs2_glock_dq_uninit(&gh);
1150
1151         return 0;
1152 }
1153
1154 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1155                          const void *data, size_t size, int flags)
1156 {
1157         struct inode *inode = dentry->d_inode;
1158         struct gfs2_ea_request er;
1159
1160         memset(&er, 0, sizeof(struct gfs2_ea_request));
1161         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1162         if (er.er_type == GFS2_EATYPE_UNUSED)
1163                 return -EOPNOTSUPP;
1164         er.er_data = (char *)data;
1165         er.er_name_len = strlen(er.er_name);
1166         er.er_data_len = size;
1167         er.er_flags = flags;
1168
1169         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1170
1171         return gfs2_ea_set(GFS2_I(inode), &er);
1172 }
1173
1174 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1175                              void *data, size_t size)
1176 {
1177         struct gfs2_ea_request er;
1178
1179         memset(&er, 0, sizeof(struct gfs2_ea_request));
1180         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1181         if (er.er_type == GFS2_EATYPE_UNUSED)
1182                 return -EOPNOTSUPP;
1183         er.er_data = data;
1184         er.er_name_len = strlen(er.er_name);
1185         er.er_data_len = size;
1186
1187         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1188 }
1189
1190 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1191 {
1192         struct gfs2_ea_request er;
1193
1194         memset(&er, 0, sizeof(struct gfs2_ea_request));
1195         er.er_data = (size) ? buffer : NULL;
1196         er.er_data_len = size;
1197
1198         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1199 }
1200
1201 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1202 {
1203         struct gfs2_ea_request er;
1204
1205         memset(&er, 0, sizeof(struct gfs2_ea_request));
1206         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1207         if (er.er_type == GFS2_EATYPE_UNUSED)
1208                 return -EOPNOTSUPP;
1209         er.er_name_len = strlen(er.er_name);
1210
1211         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1212 }
1213
1214 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1215                        u64 start, u64 len)
1216 {
1217         struct gfs2_inode *ip = GFS2_I(inode);
1218         struct gfs2_holder gh;
1219         int ret;
1220
1221         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1222         if (ret)
1223                 return ret;
1224
1225         mutex_lock(&inode->i_mutex);
1226
1227         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1228         if (ret)
1229                 goto out;
1230
1231         if (gfs2_is_stuffed(ip)) {
1232                 u64 phys = ip->i_no_addr << inode->i_blkbits;
1233                 u64 size = i_size_read(inode);
1234                 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1235                             FIEMAP_EXTENT_DATA_INLINE;
1236                 phys += sizeof(struct gfs2_dinode);
1237                 phys += start;
1238                 if (start + len > size)
1239                         len = size - start;
1240                 if (start < size)
1241                         ret = fiemap_fill_next_extent(fieinfo, start, phys,
1242                                                       len, flags);
1243                 if (ret == 1)
1244                         ret = 0;
1245         } else {
1246                 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1247                                              gfs2_block_map);
1248         }
1249
1250         gfs2_glock_dq_uninit(&gh);
1251 out:
1252         mutex_unlock(&inode->i_mutex);
1253         return ret;
1254 }
1255
1256 const struct inode_operations gfs2_file_iops = {
1257         .permission = gfs2_permission,
1258         .setattr = gfs2_setattr,
1259         .getattr = gfs2_getattr,
1260         .setxattr = gfs2_setxattr,
1261         .getxattr = gfs2_getxattr,
1262         .listxattr = gfs2_listxattr,
1263         .removexattr = gfs2_removexattr,
1264         .fiemap = gfs2_fiemap,
1265 };
1266
1267 const struct inode_operations gfs2_dir_iops = {
1268         .create = gfs2_create,
1269         .lookup = gfs2_lookup,
1270         .link = gfs2_link,
1271         .unlink = gfs2_unlink,
1272         .symlink = gfs2_symlink,
1273         .mkdir = gfs2_mkdir,
1274         .rmdir = gfs2_rmdir,
1275         .mknod = gfs2_mknod,
1276         .rename = gfs2_rename,
1277         .permission = gfs2_permission,
1278         .setattr = gfs2_setattr,
1279         .getattr = gfs2_getattr,
1280         .setxattr = gfs2_setxattr,
1281         .getxattr = gfs2_getxattr,
1282         .listxattr = gfs2_listxattr,
1283         .removexattr = gfs2_removexattr,
1284         .fiemap = gfs2_fiemap,
1285 };
1286
1287 const struct inode_operations gfs2_symlink_iops = {
1288         .readlink = gfs2_readlink,
1289         .follow_link = gfs2_follow_link,
1290         .permission = gfs2_permission,
1291         .setattr = gfs2_setattr,
1292         .getattr = gfs2_getattr,
1293         .setxattr = gfs2_setxattr,
1294         .getxattr = gfs2_getxattr,
1295         .listxattr = gfs2_listxattr,
1296         .removexattr = gfs2_removexattr,
1297         .fiemap = gfs2_fiemap,
1298 };
1299