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 v.2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/namei.h>
  16 #include <linux/utsname.h>
  17 #include <linux/mm.h>
  18 #include <linux/xattr.h>
  19 #include <linux/posix_acl.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/crc32.h>
  22 #include <asm/uaccess.h>
  23
  24 #include "gfs2.h"
  25 #include "lm_interface.h"
  26 #include "incore.h"
  27 #include "acl.h"
  28 #include "bmap.h"
  29 #include "dir.h"
  30 #include "eaops.h"
  31 #include "eattr.h"
  32 #include "glock.h"
  33 #include "inode.h"
  34 #include "meta_io.h"
  35 #include "ops_dentry.h"
  36 #include "ops_inode.h"
  37 #include "page.h"
  38 #include "quota.h"
  39 #include "rgrp.h"
  40 #include "trans.h"
  41 #include "util.h"
  42
  43 /**
  44  * gfs2_create - Create a file
  45  * @dir: The directory in which to create the file
  46  * @dentry: The dentry of the new file
  47  * @mode: The mode of the new file
  48  *
  49  * Returns: errno
  50  */
  51
  52 static int gfs2_create(struct inode *dir, struct dentry *dentry,
  53                        int mode, struct nameidata *nd)
  54 {
  55         struct gfs2_inode *dip = GFS2_I(dir);
  56         struct gfs2_sbd *sdp = GFS2_SB(dir);
  57         struct gfs2_holder ghs[2];
  58         struct inode *inode;
  59
  60         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
  61
  62         for (;;) {
  63                 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
  64                 if (!IS_ERR(inode)) {
  65                         gfs2_trans_end(sdp);
  66                         if (dip->i_alloc.al_rgd)
  67                                 gfs2_inplace_release(dip);
  68                         gfs2_quota_unlock(dip);
  69                         gfs2_alloc_put(dip);
  70                         gfs2_glock_dq_uninit_m(2, ghs);
  71                         mark_inode_dirty(inode);
  72                         break;
  73                 } else if (PTR_ERR(inode) != -EEXIST ||
  74                            (nd->intent.open.flags & O_EXCL)) {
  75                         gfs2_holder_uninit(ghs);
  76                         return PTR_ERR(inode);
  77                 }
  78
  79                 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
  80                 if (inode) {
  81                         if (!IS_ERR(inode)) {
  82                                 gfs2_holder_uninit(ghs);
  83                                 break;
  84                         } else {
  85                                 gfs2_holder_uninit(ghs);
  86                                 return PTR_ERR(inode);
  87                         }
  88                 }
  89         }
  90
  91         d_instantiate(dentry, inode);
  92
  93         return 0;
  94 }
  95
  96 /**
  97  * gfs2_lookup - Look up a filename in a directory and return its inode
  98  * @dir: The directory inode
  99  * @dentry: The dentry of the new inode
 100  * @nd: passed from Linux VFS, ignored by us
 101  *
 102  * Called by the VFS layer. Lock dir and call gfs2_lookupi()
 103  *
 104  * Returns: errno
 105  */
 106
 107 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 108                                   struct nameidata *nd)
 109 {
 110         struct inode *inode = NULL;
 111
 112         dentry->d_op = &gfs2_dops;
 113
 114         inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
 115         if (inode && IS_ERR(inode))
 116                 return ERR_PTR(PTR_ERR(inode));
 117
 118         if (inode)
 119                 return d_splice_alias(inode, dentry);
 120         d_add(dentry, inode);
 121
 122         return NULL;
 123 }
 124
 125 /**
 126  * gfs2_link - Link to a file
 127  * @old_dentry: The inode to link
 128  * @dir: Add link to this directory
 129  * @dentry: The name of the link
 130  *
 131  * Link the inode in "old_dentry" into the directory "dir" with the
 132  * name in "dentry".
 133  *
 134  * Returns: errno
 135  */
 136
 137 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 138                      struct dentry *dentry)
 139 {
 140         struct gfs2_inode *dip = GFS2_I(dir);
 141         struct gfs2_sbd *sdp = GFS2_SB(dir);
 142         struct inode *inode = old_dentry->d_inode;
 143         struct gfs2_inode *ip = GFS2_I(inode);
 144         struct gfs2_holder ghs[2];
 145         int alloc_required;
 146         int error;
 147
 148         if (S_ISDIR(ip->i_di.di_mode))
 149                 return -EPERM;
 150
 151         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 152         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 153
 154         error = gfs2_glock_nq_m(2, ghs);
 155         if (error)
 156                 goto out;
 157
 158         error = gfs2_repermission(dir, MAY_WRITE | MAY_EXEC, NULL);
 159         if (error)
 160                 goto out_gunlock;
 161
 162         error = gfs2_dir_search(dir, &dentry->d_name, NULL, NULL);
 163         switch (error) {
 164         case -ENOENT:
 165                 break;
 166         case 0:
 167                 error = -EEXIST;
 168         default:
 169                 goto out_gunlock;
 170         }
 171
 172         error = -EINVAL;
 173         if (!dip->i_di.di_nlink)
 174                 goto out_gunlock;
 175         error = -EFBIG;
 176         if (dip->i_di.di_entries == (uint32_t)-1)
 177                 goto out_gunlock;
 178         error = -EPERM;
 179         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 180                 goto out_gunlock;
 181         error = -EINVAL;
 182         if (!ip->i_di.di_nlink)
 183                 goto out_gunlock;
 184         error = -EMLINK;
 185         if (ip->i_di.di_nlink == (uint32_t)-1)
 186                 goto out_gunlock;
 187
 188         alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
 189         if (error < 0)
 190                 goto out_gunlock;
 191         error = 0;
 192
 193         if (alloc_required) {
 194                 struct gfs2_alloc *al = gfs2_alloc_get(dip);
 195
 196                 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 197                 if (error)
 198                         goto out_alloc;
 199
 200                 error = gfs2_quota_check(dip, dip->i_di.di_uid,
 201                                          dip->i_di.di_gid);
 202                 if (error)
 203                         goto out_gunlock_q;
 204
 205                 al->al_requested = sdp->sd_max_dirres;
 206
 207                 error = gfs2_inplace_reserve(dip);
 208                 if (error)
 209                         goto out_gunlock_q;
 210
 211                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 212                                          al->al_rgd->rd_ri.ri_length +
 213                                          2 * RES_DINODE + RES_STATFS +
 214                                          RES_QUOTA, 0);
 215                 if (error)
 216                         goto out_ipres;
 217         } else {
 218                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 219                 if (error)
 220                         goto out_ipres;
 221         }
 222
 223         error = gfs2_dir_add(dir, &dentry->d_name, &ip->i_num,
 224                              IF2DT(ip->i_di.di_mode));
 225         if (error)
 226                 goto out_end_trans;
 227
 228         error = gfs2_change_nlink(ip, +1);
 229
 230 out_end_trans:
 231         gfs2_trans_end(sdp);
 232
 233 out_ipres:
 234         if (alloc_required)
 235                 gfs2_inplace_release(dip);
 236
 237 out_gunlock_q:
 238         if (alloc_required)
 239                 gfs2_quota_unlock(dip);
 240
 241 out_alloc:
 242         if (alloc_required)
 243                 gfs2_alloc_put(dip);
 244
 245 out_gunlock:
 246         gfs2_glock_dq_m(2, ghs);
 247
 248 out:
 249         gfs2_holder_uninit(ghs);
 250         gfs2_holder_uninit(ghs + 1);
 251
 252         if (!error) {
 253                 d_instantiate(dentry, inode);
 254                 mark_inode_dirty(inode);
 255         }
 256
 257         return error;
 258 }
 259
 260 /**
 261  * gfs2_unlink - Unlink a file
 262  * @dir: The inode of the directory containing the file to unlink
 263  * @dentry: The file itself
 264  *
 265  * Unlink a file.  Call gfs2_unlinki()
 266  *
 267  * Returns: errno
 268  */
 269
 270 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 271 {
 272         struct gfs2_inode *dip = GFS2_I(dir);
 273         struct gfs2_sbd *sdp = GFS2_SB(dir);
 274         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 275         struct gfs2_holder ghs[2];
 276         int error;
 277
 278         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 279         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 280
 281         error = gfs2_glock_nq_m(2, ghs);
 282         if (error)
 283                 goto out;
 284
 285         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 286         if (error)
 287                 goto out_gunlock;
 288
 289         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 290         if (error)
 291                 goto out_gunlock;
 292
 293         error = gfs2_dir_del(dip, &dentry->d_name);
 294         if (error)
 295                 goto out_end_trans;
 296
 297         error = gfs2_change_nlink(ip, -1);
 298
 299 out_end_trans:
 300         gfs2_trans_end(sdp);
 301 out_gunlock:
 302         gfs2_glock_dq_m(2, ghs);
 303 out:
 304         gfs2_holder_uninit(ghs);
 305         gfs2_holder_uninit(ghs + 1);
 306         return error;
 307 }
 308
 309 /**
 310  * gfs2_symlink - Create a symlink
 311  * @dir: The directory to create the symlink in
 312  * @dentry: The dentry to put the symlink in
 313  * @symname: The thing which the link points to
 314  *
 315  * Returns: errno
 316  */
 317
 318 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 319                         const char *symname)
 320 {
 321         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 322         struct gfs2_sbd *sdp = GFS2_SB(dir);
 323         struct gfs2_holder ghs[2];
 324         struct inode *inode;
 325         struct buffer_head *dibh;
 326         int size;
 327         int error;
 328
 329         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 330         size = strlen(symname);
 331         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 332                 return -ENAMETOOLONG;
 333
 334         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 335
 336         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
 337         if (IS_ERR(inode)) {
 338                 gfs2_holder_uninit(ghs);
 339                 return PTR_ERR(inode);
 340         }
 341
 342         ip = ghs[1].gh_gl->gl_object;
 343
 344         ip->i_di.di_size = size;
 345
 346         error = gfs2_meta_inode_buffer(ip, &dibh);
 347
 348         if (!gfs2_assert_withdraw(sdp, !error)) {
 349                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
 350                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 351                        size);
 352                 brelse(dibh);
 353         }
 354
 355         gfs2_trans_end(sdp);
 356         if (dip->i_alloc.al_rgd)
 357                 gfs2_inplace_release(dip);
 358         gfs2_quota_unlock(dip);
 359         gfs2_alloc_put(dip);
 360
 361         gfs2_glock_dq_uninit_m(2, ghs);
 362
 363         d_instantiate(dentry, inode);
 364         mark_inode_dirty(inode);
 365
 366         return 0;
 367 }
 368
 369 /**
 370  * gfs2_mkdir - Make a directory
 371  * @dir: The parent directory of the new one
 372  * @dentry: The dentry of the new directory
 373  * @mode: The mode of the new directory
 374  *
 375  * Returns: errno
 376  */
 377
 378 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 379 {
 380         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 381         struct gfs2_sbd *sdp = GFS2_SB(dir);
 382         struct gfs2_holder ghs[2];
 383         struct inode *inode;
 384         struct buffer_head *dibh;
 385         int error;
 386
 387         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 388
 389         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
 390         if (IS_ERR(inode)) {
 391                 gfs2_holder_uninit(ghs);
 392                 return PTR_ERR(inode);
 393         }
 394
 395         ip = ghs[1].gh_gl->gl_object;
 396
 397         ip->i_di.di_nlink = 2;
 398         ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 399         ip->i_di.di_flags |= GFS2_DIF_JDATA;
 400         ip->i_di.di_payload_format = GFS2_FORMAT_DE;
 401         ip->i_di.di_entries = 2;
 402
 403         error = gfs2_meta_inode_buffer(ip, &dibh);
 404
 405         if (!gfs2_assert_withdraw(sdp, !error)) {
 406                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 407                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 408                 struct qstr str;
 409
 410                 gfs2_str2qstr(&str, ".");
 411                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 412                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 413                 dent->de_inum = di->di_num; /* already GFS2 endian */
 414                 dent->de_type = DT_DIR;
 415                 di->di_entries = cpu_to_be32(1);
 416
 417                 gfs2_str2qstr(&str, "..");
 418                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 419                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 420
 421                 gfs2_inum_out(&dip->i_num, (char *) &dent->de_inum);
 422                 dent->de_type = DT_DIR;
 423
 424                 gfs2_dinode_out(&ip->i_di, (char *)di);
 425
 426                 brelse(dibh);
 427         }
 428
 429         error = gfs2_change_nlink(dip, +1);
 430         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 431
 432         gfs2_trans_end(sdp);
 433         if (dip->i_alloc.al_rgd)
 434                 gfs2_inplace_release(dip);
 435         gfs2_quota_unlock(dip);
 436         gfs2_alloc_put(dip);
 437
 438         gfs2_glock_dq_uninit_m(2, ghs);
 439
 440         d_instantiate(dentry, inode);
 441         mark_inode_dirty(inode);
 442
 443         return 0;
 444 }
 445
 446 /**
 447  * gfs2_rmdir - Remove a directory
 448  * @dir: The parent directory of the directory to be removed
 449  * @dentry: The dentry of the directory to remove
 450  *
 451  * Remove a directory. Call gfs2_rmdiri()
 452  *
 453  * Returns: errno
 454  */
 455
 456 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 457 {
 458         struct gfs2_inode *dip = GFS2_I(dir);
 459         struct gfs2_sbd *sdp = GFS2_SB(dir);
 460         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 461         struct gfs2_holder ghs[2];
 462         int error;
 463
 464         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 465         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 466
 467         error = gfs2_glock_nq_m(2, ghs);
 468         if (error)
 469                 goto out;
 470
 471         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 472         if (error)
 473                 goto out_gunlock;
 474
 475         if (ip->i_di.di_entries < 2) {
 476                 if (gfs2_consist_inode(ip))
 477                         gfs2_dinode_print(&ip->i_di);
 478                 error = -EIO;
 479                 goto out_gunlock;
 480         }
 481         if (ip->i_di.di_entries > 2) {
 482                 error = -ENOTEMPTY;
 483                 goto out_gunlock;
 484         }
 485
 486         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 487         if (error)
 488                 goto out_gunlock;
 489
 490         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 491
 492         gfs2_trans_end(sdp);
 493
 494  out_gunlock:
 495         gfs2_glock_dq_m(2, ghs);
 496
 497  out:
 498         gfs2_holder_uninit(ghs);
 499         gfs2_holder_uninit(ghs + 1);
 500
 501         return error;
 502 }
 503
 504 /**
 505  * gfs2_mknod - Make a special file
 506  * @dir: The directory in which the special file will reside
 507  * @dentry: The dentry of the special file
 508  * @mode: The mode of the special file
 509  * @rdev: The device specification of the special file
 510  *
 511  */
 512
 513 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 514                       dev_t dev)
 515 {
 516         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 517         struct gfs2_sbd *sdp = GFS2_SB(dir);
 518         struct gfs2_holder ghs[2];
 519         struct inode *inode;
 520         struct buffer_head *dibh;
 521         uint32_t major = 0, minor = 0;
 522         int error;
 523
 524         switch (mode & S_IFMT) {
 525         case S_IFBLK:
 526         case S_IFCHR:
 527                 major = MAJOR(dev);
 528                 minor = MINOR(dev);
 529                 break;
 530         case S_IFIFO:
 531         case S_IFSOCK:
 532                 break;
 533         default:
 534                 return -EOPNOTSUPP;
 535         };
 536
 537         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 538
 539         inode = gfs2_createi(ghs, &dentry->d_name, mode);
 540         if (IS_ERR(inode)) {
 541                 gfs2_holder_uninit(ghs);
 542                 return PTR_ERR(inode);
 543         }
 544
 545         ip = ghs[1].gh_gl->gl_object;
 546
 547         ip->i_di.di_major = major;
 548         ip->i_di.di_minor = minor;
 549
 550         error = gfs2_meta_inode_buffer(ip, &dibh);
 551
 552         if (!gfs2_assert_withdraw(sdp, !error)) {
 553                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
 554                 brelse(dibh);
 555         }
 556
 557         gfs2_trans_end(sdp);
 558         if (dip->i_alloc.al_rgd)
 559                 gfs2_inplace_release(dip);
 560         gfs2_quota_unlock(dip);
 561         gfs2_alloc_put(dip);
 562
 563         gfs2_glock_dq_uninit_m(2, ghs);
 564
 565         d_instantiate(dentry, inode);
 566         mark_inode_dirty(inode);
 567
 568         return 0;
 569 }
 570
 571 /**
 572  * gfs2_rename - Rename a file
 573  * @odir: Parent directory of old file name
 574  * @odentry: The old dentry of the file
 575  * @ndir: Parent directory of new file name
 576  * @ndentry: The new dentry of the file
 577  *
 578  * Returns: errno
 579  */
 580
 581 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 582                        struct inode *ndir, struct dentry *ndentry)
 583 {
 584         struct gfs2_inode *odip = GFS2_I(odir);
 585         struct gfs2_inode *ndip = GFS2_I(ndir);
 586         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 587         struct gfs2_inode *nip = NULL;
 588         struct gfs2_sbd *sdp = GFS2_SB(odir);
 589         struct gfs2_holder ghs[4], r_gh;
 590         unsigned int num_gh;
 591         int dir_rename = 0;
 592         int alloc_required;
 593         unsigned int x;
 594         int error;
 595
 596         if (ndentry->d_inode) {
 597                 nip = GFS2_I(ndentry->d_inode);
 598                 if (ip == nip)
 599                         return 0;
 600         }
 601
 602         /* Make sure we aren't trying to move a dirctory into it's subdir */
 603
 604         if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
 605                 dir_rename = 1;
 606
 607                 error = gfs2_glock_nq_init(sdp->sd_rename_gl,
 608                                            LM_ST_EXCLUSIVE, 0,
 609                                            &r_gh);
 610                 if (error)
 611                         goto out;
 612
 613                 error = gfs2_ok_to_move(ip, ndip);
 614                 if (error)
 615                         goto out_gunlock_r;
 616         }
 617
 618         num_gh = 1;
 619         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 620         if (odip != ndip) {
 621                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 622                 num_gh++;
 623         }
 624         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 625         num_gh++;
 626
 627         if (nip) {
 628                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 629                 num_gh++;
 630         }
 631
 632         error = gfs2_glock_nq_m(num_gh, ghs);
 633         if (error)
 634                 goto out_uninit;
 635
 636         /* Check out the old directory */
 637
 638         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 639         if (error)
 640                 goto out_gunlock;
 641
 642         /* Check out the new directory */
 643
 644         if (nip) {
 645                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 646                 if (error)
 647                         goto out_gunlock;
 648
 649                 if (S_ISDIR(nip->i_di.di_mode)) {
 650                         if (nip->i_di.di_entries < 2) {
 651                                 if (gfs2_consist_inode(nip))
 652                                         gfs2_dinode_print(&nip->i_di);
 653                                 error = -EIO;
 654                                 goto out_gunlock;
 655                         }
 656                         if (nip->i_di.di_entries > 2) {
 657                                 error = -ENOTEMPTY;
 658                                 goto out_gunlock;
 659                         }
 660                 }
 661         } else {
 662                 error = gfs2_repermission(ndir, MAY_WRITE | MAY_EXEC, NULL);
 663                 if (error)
 664                         goto out_gunlock;
 665
 666                 error = gfs2_dir_search(ndir, &ndentry->d_name, NULL, NULL);
 667                 switch (error) {
 668                 case -ENOENT:
 669                         error = 0;
 670                         break;
 671                 case 0:
 672                         error = -EEXIST;
 673                 default:
 674                         goto out_gunlock;
 675                 };
 676
 677                 if (odip != ndip) {
 678                         if (!ndip->i_di.di_nlink) {
 679                                 error = -EINVAL;
 680                                 goto out_gunlock;
 681                         }
 682                         if (ndip->i_di.di_entries == (uint32_t)-1) {
 683                                 error = -EFBIG;
 684                                 goto out_gunlock;
 685                         }
 686                         if (S_ISDIR(ip->i_di.di_mode) &&
 687                             ndip->i_di.di_nlink == (uint32_t)-1) {
 688                                 error = -EMLINK;
 689                                 goto out_gunlock;
 690                         }
 691                 }
 692         }
 693
 694         /* Check out the dir to be renamed */
 695
 696         if (dir_rename) {
 697                 error = gfs2_repermission(odentry->d_inode, MAY_WRITE, NULL);
 698                 if (error)
 699                         goto out_gunlock;
 700         }
 701
 702         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 703         if (error < 0)
 704                 goto out_gunlock;
 705         error = 0;
 706
 707         if (alloc_required) {
 708                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 709
 710                 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 711                 if (error)
 712                         goto out_alloc;
 713
 714                 error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
 715                                          ndip->i_di.di_gid);
 716                 if (error)
 717                         goto out_gunlock_q;
 718
 719                 al->al_requested = sdp->sd_max_dirres;
 720
 721                 error = gfs2_inplace_reserve(ndip);
 722                 if (error)
 723                         goto out_gunlock_q;
 724
 725                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 726                                          al->al_rgd->rd_ri.ri_length +
 727                                          4 * RES_DINODE + 4 * RES_LEAF +
 728                                          RES_STATFS + RES_QUOTA, 0);
 729                 if (error)
 730                         goto out_ipreserv;
 731         } else {
 732                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 733                                          5 * RES_LEAF, 0);
 734                 if (error)
 735                         goto out_gunlock;
 736         }
 737
 738         /* Remove the target file, if it exists */
 739
 740         if (nip) {
 741                 if (S_ISDIR(nip->i_di.di_mode))
 742                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 743                 else {
 744                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 745                         if (error)
 746                                 goto out_end_trans;
 747                         error = gfs2_change_nlink(nip, -1);
 748                 }
 749                 if (error)
 750                         goto out_end_trans;
 751         }
 752
 753         if (dir_rename) {
 754                 struct qstr name;
 755                 gfs2_str2qstr(&name, "..");
 756
 757                 error = gfs2_change_nlink(ndip, +1);
 758                 if (error)
 759                         goto out_end_trans;
 760                 error = gfs2_change_nlink(odip, -1);
 761                 if (error)
 762                         goto out_end_trans;
 763
 764                 error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
 765                 if (error)
 766                         goto out_end_trans;
 767         } else {
 768                 struct buffer_head *dibh;
 769                 error = gfs2_meta_inode_buffer(ip, &dibh);
 770                 if (error)
 771                         goto out_end_trans;
 772                 ip->i_di.di_ctime = get_seconds();
 773                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 774                 gfs2_dinode_out(&ip->i_di, dibh->b_data);
 775                 brelse(dibh);
 776         }
 777
 778         error = gfs2_dir_del(odip, &odentry->d_name);
 779         if (error)
 780                 goto out_end_trans;
 781
 782         error = gfs2_dir_add(ndir, &ndentry->d_name, &ip->i_num,
 783                              IF2DT(ip->i_di.di_mode));
 784         if (error)
 785                 goto out_end_trans;
 786
 787 out_end_trans:
 788         gfs2_trans_end(sdp);
 789 out_ipreserv:
 790         if (alloc_required)
 791                 gfs2_inplace_release(ndip);
 792 out_gunlock_q:
 793         if (alloc_required)
 794                 gfs2_quota_unlock(ndip);
 795 out_alloc:
 796         if (alloc_required)
 797                 gfs2_alloc_put(ndip);
 798 out_gunlock:
 799         gfs2_glock_dq_m(num_gh, ghs);
 800 out_uninit:
 801         for (x = 0; x < num_gh; x++)
 802                 gfs2_holder_uninit(ghs + x);
 803 out_gunlock_r:
 804         if (dir_rename)
 805                 gfs2_glock_dq_uninit(&r_gh);
 806 out:
 807         return error;
 808 }
 809
 810 /**
 811  * gfs2_readlink - Read the value of a symlink
 812  * @dentry: the symlink
 813  * @buf: the buffer to read the symlink data into
 814  * @size: the size of the buffer
 815  *
 816  * Returns: errno
 817  */
 818
 819 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 820                          int user_size)
 821 {
 822         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 823         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 824         unsigned int len = GFS2_FAST_NAME_SIZE;
 825         int error;
 826
 827         error = gfs2_readlinki(ip, &buf, &len);
 828         if (error)
 829                 return error;
 830
 831         if (user_size > len - 1)
 832                 user_size = len - 1;
 833
 834         if (copy_to_user(user_buf, buf, user_size))
 835                 error = -EFAULT;
 836         else
 837                 error = user_size;
 838
 839         if (buf != array)
 840                 kfree(buf);
 841
 842         return error;
 843 }
 844
 845 /**
 846  * gfs2_follow_link - Follow a symbolic link
 847  * @dentry: The dentry of the link
 848  * @nd: Data that we pass to vfs_follow_link()
 849  *
 850  * This can handle symlinks of any size. It is optimised for symlinks
 851  * under GFS2_FAST_NAME_SIZE.
 852  *
 853  * Returns: 0 on success or error code
 854  */
 855
 856 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 857 {
 858         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 859         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 860         unsigned int len = GFS2_FAST_NAME_SIZE;
 861         int error;
 862
 863         error = gfs2_readlinki(ip, &buf, &len);
 864         if (!error) {
 865                 error = vfs_follow_link(nd, buf);
 866                 if (buf != array)
 867                         kfree(buf);
 868         }
 869
 870         return ERR_PTR(error);
 871 }
 872
 873 /**
 874  * gfs2_permission -
 875  * @inode:
 876  * @mask:
 877  * @nd: passed from Linux VFS, ignored by us
 878  *
 879  * Returns: errno
 880  */
 881
 882 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
 883 {
 884         struct gfs2_inode *ip = GFS2_I(inode);
 885         struct gfs2_holder i_gh;
 886         int error;
 887
 888         if (ip->i_vn == ip->i_gl->gl_vn)
 889                 return generic_permission(inode, mask, gfs2_check_acl);
 890
 891         error = gfs2_glock_nq_init(ip->i_gl,
 892                                    LM_ST_SHARED, LM_FLAG_ANY,
 893                                    &i_gh);
 894         if (!error) {
 895                 error = generic_permission(inode, mask, gfs2_check_acl_locked);
 896                 gfs2_glock_dq_uninit(&i_gh);
 897         }
 898
 899         return error;
 900 }
 901
 902 static int setattr_size(struct inode *inode, struct iattr *attr)
 903 {
 904         struct gfs2_inode *ip = GFS2_I(inode);
 905         int error;
 906
 907         if (attr->ia_size != ip->i_di.di_size) {
 908                 error = vmtruncate(inode, attr->ia_size);
 909                 if (error)
 910                         return error;
 911         }
 912
 913         error = gfs2_truncatei(ip, attr->ia_size);
 914         if (error)
 915                 return error;
 916
 917         return error;
 918 }
 919
 920 static int setattr_chown(struct inode *inode, struct iattr *attr)
 921 {
 922         struct gfs2_inode *ip = GFS2_I(inode);
 923         struct gfs2_sbd *sdp = GFS2_SB(inode);
 924         struct buffer_head *dibh;
 925         uint32_t ouid, ogid, nuid, ngid;
 926         int error;
 927
 928         ouid = ip->i_di.di_uid;
 929         ogid = ip->i_di.di_gid;
 930         nuid = attr->ia_uid;
 931         ngid = attr->ia_gid;
 932
 933         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
 934                 ouid = nuid = NO_QUOTA_CHANGE;
 935         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
 936                 ogid = ngid = NO_QUOTA_CHANGE;
 937
 938         gfs2_alloc_get(ip);
 939
 940         error = gfs2_quota_lock(ip, nuid, ngid);
 941         if (error)
 942                 goto out_alloc;
 943
 944         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 945                 error = gfs2_quota_check(ip, nuid, ngid);
 946                 if (error)
 947                         goto out_gunlock_q;
 948         }
 949
 950         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
 951         if (error)
 952                 goto out_gunlock_q;
 953
 954         error = gfs2_meta_inode_buffer(ip, &dibh);
 955         if (error)
 956                 goto out_end_trans;
 957
 958         error = inode_setattr(inode, attr);
 959         gfs2_assert_warn(sdp, !error);
 960         gfs2_inode_attr_out(ip);
 961
 962         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 963         gfs2_dinode_out(&ip->i_di, dibh->b_data);
 964         brelse(dibh);
 965
 966         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 967                 gfs2_quota_change(ip, -ip->i_di.di_blocks,
 968                                  ouid, ogid);
 969                 gfs2_quota_change(ip, ip->i_di.di_blocks,
 970                                  nuid, ngid);
 971         }
 972
 973  out_end_trans:
 974         gfs2_trans_end(sdp);
 975
 976  out_gunlock_q:
 977         gfs2_quota_unlock(ip);
 978
 979  out_alloc:
 980         gfs2_alloc_put(ip);
 981
 982         return error;
 983 }
 984
 985 /**
 986  * gfs2_setattr - Change attributes on an inode
 987  * @dentry: The dentry which is changing
 988  * @attr: The structure describing the change
 989  *
 990  * The VFS layer wants to change one or more of an inodes attributes.  Write
 991  * that change out to disk.
 992  *
 993  * Returns: errno
 994  */
 995
 996 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
 997 {
 998         struct inode *inode = dentry->d_inode;
 999         struct gfs2_inode *ip = GFS2_I(inode);
1000         struct gfs2_holder i_gh;
1001         int error;
1002
1003         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1004         if (error)
1005                 return error;
1006
1007         error = -EPERM;
1008         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1009                 goto out;
1010
1011         error = inode_change_ok(inode, attr);
1012         if (error)
1013                 goto out;
1014
1015         if (attr->ia_valid & ATTR_SIZE)
1016                 error = setattr_size(inode, attr);
1017         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1018                 error = setattr_chown(inode, attr);
1019         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1020                 error = gfs2_acl_chmod(ip, attr);
1021         else
1022                 error = gfs2_setattr_simple(ip, attr);
1023
1024  out:
1025         gfs2_glock_dq_uninit(&i_gh);
1026
1027         if (!error)
1028                 mark_inode_dirty(inode);
1029
1030         return error;
1031 }
1032
1033 /**
1034  * gfs2_getattr - Read out an inode's attributes
1035  * @mnt: ?
1036  * @dentry: The dentry to stat
1037  * @stat: The inode's stats
1038  *
1039  * Returns: errno
1040  */
1041
1042 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1043                         struct kstat *stat)
1044 {
1045         struct inode *inode = dentry->d_inode;
1046         struct gfs2_inode *ip = GFS2_I(inode);
1047         struct gfs2_holder gh;
1048         int error;
1049
1050         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1051         if (!error) {
1052                 generic_fillattr(inode, stat);
1053                 gfs2_glock_dq_uninit(&gh);
1054         }
1055
1056         return error;
1057 }
1058
1059 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1060                          const void *data, size_t size, int flags)
1061 {
1062         struct inode *inode = dentry->d_inode;
1063         struct gfs2_ea_request er;
1064
1065         memset(&er, 0, sizeof(struct gfs2_ea_request));
1066         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1067         if (er.er_type == GFS2_EATYPE_UNUSED)
1068                 return -EOPNOTSUPP;
1069         er.er_data = (char *)data;
1070         er.er_name_len = strlen(er.er_name);
1071         er.er_data_len = size;
1072         er.er_flags = flags;
1073
1074         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1075
1076         return gfs2_ea_set(GFS2_I(inode), &er);
1077 }
1078
1079 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1080                              void *data, size_t size)
1081 {
1082         struct gfs2_ea_request er;
1083
1084         memset(&er, 0, sizeof(struct gfs2_ea_request));
1085         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1086         if (er.er_type == GFS2_EATYPE_UNUSED)
1087                 return -EOPNOTSUPP;
1088         er.er_data = data;
1089         er.er_name_len = strlen(er.er_name);
1090         er.er_data_len = size;
1091
1092         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1093 }
1094
1095 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1096 {
1097         struct gfs2_ea_request er;
1098
1099         memset(&er, 0, sizeof(struct gfs2_ea_request));
1100         er.er_data = (size) ? buffer : NULL;
1101         er.er_data_len = size;
1102
1103         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1104 }
1105
1106 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1107 {
1108         struct gfs2_ea_request er;
1109
1110         memset(&er, 0, sizeof(struct gfs2_ea_request));
1111         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1112         if (er.er_type == GFS2_EATYPE_UNUSED)
1113                 return -EOPNOTSUPP;
1114         er.er_name_len = strlen(er.er_name);
1115
1116         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1117 }
1118
1119 struct inode_operations gfs2_file_iops = {
1120         .permission = gfs2_permission,
1121         .setattr = gfs2_setattr,
1122         .getattr = gfs2_getattr,
1123         .setxattr = gfs2_setxattr,
1124         .getxattr = gfs2_getxattr,
1125         .listxattr = gfs2_listxattr,
1126         .removexattr = gfs2_removexattr,
1127 };
1128
1129 struct inode_operations gfs2_dev_iops = {
1130         .permission = gfs2_permission,
1131         .setattr = gfs2_setattr,
1132         .getattr = gfs2_getattr,
1133         .setxattr = gfs2_setxattr,
1134         .getxattr = gfs2_getxattr,
1135         .listxattr = gfs2_listxattr,
1136         .removexattr = gfs2_removexattr,
1137 };
1138
1139 struct inode_operations gfs2_dir_iops = {
1140         .create = gfs2_create,
1141         .lookup = gfs2_lookup,
1142         .link = gfs2_link,
1143         .unlink = gfs2_unlink,
1144         .symlink = gfs2_symlink,
1145         .mkdir = gfs2_mkdir,
1146         .rmdir = gfs2_rmdir,
1147         .mknod = gfs2_mknod,
1148         .rename = gfs2_rename,
1149         .permission = gfs2_permission,
1150         .setattr = gfs2_setattr,
1151         .getattr = gfs2_getattr,
1152         .setxattr = gfs2_setxattr,
1153         .getxattr = gfs2_getxattr,
1154         .listxattr = gfs2_listxattr,
1155         .removexattr = gfs2_removexattr,
1156 };
1157
1158 struct inode_operations gfs2_symlink_iops = {
1159         .readlink = gfs2_readlink,
1160         .follow_link = gfs2_follow_link,
1161         .permission = gfs2_permission,
1162         .setattr = gfs2_setattr,
1163         .getattr = gfs2_getattr,
1164         .setxattr = gfs2_setxattr,
1165         .getxattr = gfs2_getxattr,
1166         .listxattr = gfs2_listxattr,
1167         .removexattr = gfs2_removexattr,
1168 };
1169