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/lm_interface.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 "ops_dentry.h"
  35 #include "ops_inode.h"
  36 #include "quota.h"
  37 #include "rgrp.h"
  38 #include "trans.h"
  39 #include "util.h"
  40
  41 /**
  42  * gfs2_create - Create a file
  43  * @dir: The directory in which to create the file
  44  * @dentry: The dentry of the new file
  45  * @mode: The mode of the new file
  46  *
  47  * Returns: errno
  48  */
  49
  50 static int gfs2_create(struct inode *dir, struct dentry *dentry,
  51                        int mode, struct nameidata *nd)
  52 {
  53         struct gfs2_inode *dip = GFS2_I(dir);
  54         struct gfs2_sbd *sdp = GFS2_SB(dir);
  55         struct gfs2_holder ghs[2];
  56         struct inode *inode;
  57
  58         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
  59
  60         for (;;) {
  61                 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
  62                 if (!IS_ERR(inode)) {
  63                         gfs2_trans_end(sdp);
  64                         if (dip->i_alloc.al_rgd)
  65                                 gfs2_inplace_release(dip);
  66                         gfs2_quota_unlock(dip);
  67                         gfs2_alloc_put(dip);
  68                         gfs2_glock_dq_uninit_m(2, ghs);
  69                         mark_inode_dirty(inode);
  70                         break;
  71                 } else if (PTR_ERR(inode) != -EEXIST ||
  72                            (nd && (nd->intent.open.flags & O_EXCL))) {
  73                         gfs2_holder_uninit(ghs);
  74                         return PTR_ERR(inode);
  75                 }
  76
  77                 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
  78                 if (inode) {
  79                         if (!IS_ERR(inode)) {
  80                                 gfs2_holder_uninit(ghs);
  81                                 break;
  82                         } else {
  83                                 gfs2_holder_uninit(ghs);
  84                                 return PTR_ERR(inode);
  85                         }
  86                 }
  87         }
  88
  89         d_instantiate(dentry, inode);
  90
  91         return 0;
  92 }
  93
  94 /**
  95  * gfs2_lookup - Look up a filename in a directory and return its inode
  96  * @dir: The directory inode
  97  * @dentry: The dentry of the new inode
  98  * @nd: passed from Linux VFS, ignored by us
  99  *
 100  * Called by the VFS layer. Lock dir and call gfs2_lookupi()
 101  *
 102  * Returns: errno
 103  */
 104
 105 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 106                                   struct nameidata *nd)
 107 {
 108         struct inode *inode = NULL;
 109
 110         dentry->d_op = &gfs2_dops;
 111
 112         inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
 113         if (inode && IS_ERR(inode))
 114                 return ERR_PTR(PTR_ERR(inode));
 115
 116         if (inode)
 117                 return d_splice_alias(inode, dentry);
 118         d_add(dentry, inode);
 119
 120         return NULL;
 121 }
 122
 123 /**
 124  * gfs2_link - Link to a file
 125  * @old_dentry: The inode to link
 126  * @dir: Add link to this directory
 127  * @dentry: The name of the link
 128  *
 129  * Link the inode in "old_dentry" into the directory "dir" with the
 130  * name in "dentry".
 131  *
 132  * Returns: errno
 133  */
 134
 135 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 136                      struct dentry *dentry)
 137 {
 138         struct gfs2_inode *dip = GFS2_I(dir);
 139         struct gfs2_sbd *sdp = GFS2_SB(dir);
 140         struct inode *inode = old_dentry->d_inode;
 141         struct gfs2_inode *ip = GFS2_I(inode);
 142         struct gfs2_holder ghs[2];
 143         int alloc_required;
 144         int error;
 145
 146         if (S_ISDIR(inode->i_mode))
 147                 return -EPERM;
 148
 149         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 150         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 151
 152         error = gfs2_glock_nq_m(2, ghs);
 153         if (error)
 154                 goto out;
 155
 156         error = permission(dir, MAY_WRITE | MAY_EXEC, NULL);
 157         if (error)
 158                 goto out_gunlock;
 159
 160         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 161         switch (error) {
 162         case -ENOENT:
 163                 break;
 164         case 0:
 165                 error = -EEXIST;
 166         default:
 167                 goto out_gunlock;
 168         }
 169
 170         error = -EINVAL;
 171         if (!dip->i_inode.i_nlink)
 172                 goto out_gunlock;
 173         error = -EFBIG;
 174         if (dip->i_di.di_entries == (u32)-1)
 175                 goto out_gunlock;
 176         error = -EPERM;
 177         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 178                 goto out_gunlock;
 179         error = -EINVAL;
 180         if (!ip->i_inode.i_nlink)
 181                 goto out_gunlock;
 182         error = -EMLINK;
 183         if (ip->i_inode.i_nlink == (u32)-1)
 184                 goto out_gunlock;
 185
 186         alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
 187         if (error < 0)
 188                 goto out_gunlock;
 189         error = 0;
 190
 191         if (alloc_required) {
 192                 struct gfs2_alloc *al = gfs2_alloc_get(dip);
 193
 194                 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 195                 if (error)
 196                         goto out_alloc;
 197
 198                 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
 199                 if (error)
 200                         goto out_gunlock_q;
 201
 202                 al->al_requested = sdp->sd_max_dirres;
 203
 204                 error = gfs2_inplace_reserve(dip);
 205                 if (error)
 206                         goto out_gunlock_q;
 207
 208                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 209                                          al->al_rgd->rd_length +
 210                                          2 * RES_DINODE + RES_STATFS +
 211                                          RES_QUOTA, 0);
 212                 if (error)
 213                         goto out_ipres;
 214         } else {
 215                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 216                 if (error)
 217                         goto out_ipres;
 218         }
 219
 220         error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
 221         if (error)
 222                 goto out_end_trans;
 223
 224         error = gfs2_change_nlink(ip, +1);
 225
 226 out_end_trans:
 227         gfs2_trans_end(sdp);
 228 out_ipres:
 229         if (alloc_required)
 230                 gfs2_inplace_release(dip);
 231 out_gunlock_q:
 232         if (alloc_required)
 233                 gfs2_quota_unlock(dip);
 234 out_alloc:
 235         if (alloc_required)
 236                 gfs2_alloc_put(dip);
 237 out_gunlock:
 238         gfs2_glock_dq_m(2, ghs);
 239 out:
 240         gfs2_holder_uninit(ghs);
 241         gfs2_holder_uninit(ghs + 1);
 242         if (!error) {
 243                 atomic_inc(&inode->i_count);
 244                 d_instantiate(dentry, inode);
 245                 mark_inode_dirty(inode);
 246         }
 247         return error;
 248 }
 249
 250 /**
 251  * gfs2_unlink - Unlink a file
 252  * @dir: The inode of the directory containing the file to unlink
 253  * @dentry: The file itself
 254  *
 255  * Unlink a file.  Call gfs2_unlinki()
 256  *
 257  * Returns: errno
 258  */
 259
 260 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 261 {
 262         struct gfs2_inode *dip = GFS2_I(dir);
 263         struct gfs2_sbd *sdp = GFS2_SB(dir);
 264         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 265         struct gfs2_holder ghs[3];
 266         struct gfs2_rgrpd *rgd;
 267         struct gfs2_holder ri_gh;
 268         int error;
 269
 270         error = gfs2_rindex_hold(sdp, &ri_gh);
 271         if (error)
 272                 return error;
 273
 274         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 275         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
 276
 277         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 278         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 279
 280
 281         error = gfs2_glock_nq(ghs); /* parent */
 282         if (error)
 283                 goto out_parent;
 284
 285         error = gfs2_glock_nq(ghs + 1); /* child */
 286         if (error)
 287                 goto out_child;
 288
 289         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 290         if (error)
 291                 goto out_rgrp;
 292
 293         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 294         if (error)
 295                 goto out_rgrp;
 296
 297         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 298         if (error)
 299                 goto out_rgrp;
 300
 301         error = gfs2_dir_del(dip, &dentry->d_name);
 302         if (error)
 303                 goto out_end_trans;
 304
 305         error = gfs2_change_nlink(ip, -1);
 306
 307 out_end_trans:
 308         gfs2_trans_end(sdp);
 309         gfs2_glock_dq(ghs + 2);
 310 out_rgrp:
 311         gfs2_holder_uninit(ghs + 2);
 312         gfs2_glock_dq(ghs + 1);
 313 out_child:
 314         gfs2_holder_uninit(ghs + 1);
 315         gfs2_glock_dq(ghs);
 316 out_parent:
 317         gfs2_holder_uninit(ghs);
 318         gfs2_glock_dq_uninit(&ri_gh);
 319         return error;
 320 }
 321
 322 /**
 323  * gfs2_symlink - Create a symlink
 324  * @dir: The directory to create the symlink in
 325  * @dentry: The dentry to put the symlink in
 326  * @symname: The thing which the link points to
 327  *
 328  * Returns: errno
 329  */
 330
 331 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 332                         const char *symname)
 333 {
 334         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 335         struct gfs2_sbd *sdp = GFS2_SB(dir);
 336         struct gfs2_holder ghs[2];
 337         struct inode *inode;
 338         struct buffer_head *dibh;
 339         int size;
 340         int error;
 341
 342         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 343         size = strlen(symname);
 344         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 345                 return -ENAMETOOLONG;
 346
 347         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 348
 349         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 350         if (IS_ERR(inode)) {
 351                 gfs2_holder_uninit(ghs);
 352                 return PTR_ERR(inode);
 353         }
 354
 355         ip = ghs[1].gh_gl->gl_object;
 356
 357         ip->i_di.di_size = size;
 358
 359         error = gfs2_meta_inode_buffer(ip, &dibh);
 360
 361         if (!gfs2_assert_withdraw(sdp, !error)) {
 362                 gfs2_dinode_out(ip, dibh->b_data);
 363                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 364                        size);
 365                 brelse(dibh);
 366         }
 367
 368         gfs2_trans_end(sdp);
 369         if (dip->i_alloc.al_rgd)
 370                 gfs2_inplace_release(dip);
 371         gfs2_quota_unlock(dip);
 372         gfs2_alloc_put(dip);
 373
 374         gfs2_glock_dq_uninit_m(2, ghs);
 375
 376         d_instantiate(dentry, inode);
 377         mark_inode_dirty(inode);
 378
 379         return 0;
 380 }
 381
 382 /**
 383  * gfs2_mkdir - Make a directory
 384  * @dir: The parent directory of the new one
 385  * @dentry: The dentry of the new directory
 386  * @mode: The mode of the new directory
 387  *
 388  * Returns: errno
 389  */
 390
 391 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 392 {
 393         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 394         struct gfs2_sbd *sdp = GFS2_SB(dir);
 395         struct gfs2_holder ghs[2];
 396         struct inode *inode;
 397         struct buffer_head *dibh;
 398         int error;
 399
 400         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 401
 402         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 403         if (IS_ERR(inode)) {
 404                 gfs2_holder_uninit(ghs);
 405                 return PTR_ERR(inode);
 406         }
 407
 408         ip = ghs[1].gh_gl->gl_object;
 409
 410         ip->i_inode.i_nlink = 2;
 411         ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 412         ip->i_di.di_flags |= GFS2_DIF_JDATA;
 413         ip->i_di.di_entries = 2;
 414
 415         error = gfs2_meta_inode_buffer(ip, &dibh);
 416
 417         if (!gfs2_assert_withdraw(sdp, !error)) {
 418                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 419                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 420                 struct qstr str;
 421
 422                 gfs2_str2qstr(&str, ".");
 423                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 424                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 425                 dent->de_inum = di->di_num; /* already GFS2 endian */
 426                 dent->de_type = cpu_to_be16(DT_DIR);
 427                 di->di_entries = cpu_to_be32(1);
 428
 429                 gfs2_str2qstr(&str, "..");
 430                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 431                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 432
 433                 gfs2_inum_out(dip, dent);
 434                 dent->de_type = cpu_to_be16(DT_DIR);
 435
 436                 gfs2_dinode_out(ip, di);
 437
 438                 brelse(dibh);
 439         }
 440
 441         error = gfs2_change_nlink(dip, +1);
 442         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 443
 444         gfs2_trans_end(sdp);
 445         if (dip->i_alloc.al_rgd)
 446                 gfs2_inplace_release(dip);
 447         gfs2_quota_unlock(dip);
 448         gfs2_alloc_put(dip);
 449
 450         gfs2_glock_dq_uninit_m(2, ghs);
 451
 452         d_instantiate(dentry, inode);
 453         mark_inode_dirty(inode);
 454
 455         return 0;
 456 }
 457
 458 /**
 459  * gfs2_rmdir - Remove a directory
 460  * @dir: The parent directory of the directory to be removed
 461  * @dentry: The dentry of the directory to remove
 462  *
 463  * Remove a directory. Call gfs2_rmdiri()
 464  *
 465  * Returns: errno
 466  */
 467
 468 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 469 {
 470         struct gfs2_inode *dip = GFS2_I(dir);
 471         struct gfs2_sbd *sdp = GFS2_SB(dir);
 472         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 473         struct gfs2_holder ghs[3];
 474         struct gfs2_rgrpd *rgd;
 475         struct gfs2_holder ri_gh;
 476         int error;
 477
 478
 479         error = gfs2_rindex_hold(sdp, &ri_gh);
 480         if (error)
 481                 return error;
 482         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 483         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 484
 485         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 486         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 487
 488         error = gfs2_glock_nq_m(3, ghs);
 489         if (error)
 490                 goto out;
 491
 492         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 493         if (error)
 494                 goto out_gunlock;
 495
 496         if (ip->i_di.di_entries < 2) {
 497                 if (gfs2_consist_inode(ip))
 498                         gfs2_dinode_print(ip);
 499                 error = -EIO;
 500                 goto out_gunlock;
 501         }
 502         if (ip->i_di.di_entries > 2) {
 503                 error = -ENOTEMPTY;
 504                 goto out_gunlock;
 505         }
 506
 507         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 508         if (error)
 509                 goto out_gunlock;
 510
 511         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 512
 513         gfs2_trans_end(sdp);
 514
 515 out_gunlock:
 516         gfs2_glock_dq_m(3, ghs);
 517 out:
 518         gfs2_holder_uninit(ghs);
 519         gfs2_holder_uninit(ghs + 1);
 520         gfs2_holder_uninit(ghs + 2);
 521         gfs2_glock_dq_uninit(&ri_gh);
 522         return error;
 523 }
 524
 525 /**
 526  * gfs2_mknod - Make a special file
 527  * @dir: The directory in which the special file will reside
 528  * @dentry: The dentry of the special file
 529  * @mode: The mode of the special file
 530  * @rdev: The device specification of the special file
 531  *
 532  */
 533
 534 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 535                       dev_t dev)
 536 {
 537         struct gfs2_inode *dip = GFS2_I(dir);
 538         struct gfs2_sbd *sdp = GFS2_SB(dir);
 539         struct gfs2_holder ghs[2];
 540         struct inode *inode;
 541
 542         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 543
 544         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 545         if (IS_ERR(inode)) {
 546                 gfs2_holder_uninit(ghs);
 547                 return PTR_ERR(inode);
 548         }
 549
 550         gfs2_trans_end(sdp);
 551         if (dip->i_alloc.al_rgd)
 552                 gfs2_inplace_release(dip);
 553         gfs2_quota_unlock(dip);
 554         gfs2_alloc_put(dip);
 555
 556         gfs2_glock_dq_uninit_m(2, ghs);
 557
 558         d_instantiate(dentry, inode);
 559         mark_inode_dirty(inode);
 560
 561         return 0;
 562 }
 563
 564 /**
 565  * gfs2_rename - Rename a file
 566  * @odir: Parent directory of old file name
 567  * @odentry: The old dentry of the file
 568  * @ndir: Parent directory of new file name
 569  * @ndentry: The new dentry of the file
 570  *
 571  * Returns: errno
 572  */
 573
 574 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 575                        struct inode *ndir, struct dentry *ndentry)
 576 {
 577         struct gfs2_inode *odip = GFS2_I(odir);
 578         struct gfs2_inode *ndip = GFS2_I(ndir);
 579         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 580         struct gfs2_inode *nip = NULL;
 581         struct gfs2_sbd *sdp = GFS2_SB(odir);
 582         struct gfs2_holder ghs[5], r_gh;
 583         struct gfs2_rgrpd *nrgd;
 584         unsigned int num_gh;
 585         int dir_rename = 0;
 586         int alloc_required;
 587         unsigned int x;
 588         int error;
 589
 590         if (ndentry->d_inode) {
 591                 nip = GFS2_I(ndentry->d_inode);
 592                 if (ip == nip)
 593                         return 0;
 594         }
 595
 596         /* Make sure we aren't trying to move a dirctory into it's subdir */
 597
 598         if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
 599                 dir_rename = 1;
 600
 601                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
 602                                            &r_gh);
 603                 if (error)
 604                         goto out;
 605
 606                 error = gfs2_ok_to_move(ip, ndip);
 607                 if (error)
 608                         goto out_gunlock_r;
 609         }
 610
 611         num_gh = 1;
 612         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 613         if (odip != ndip) {
 614                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 615                 num_gh++;
 616         }
 617         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 618         num_gh++;
 619
 620         if (nip) {
 621                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 622                 num_gh++;
 623                 /* grab the resource lock for unlink flag twiddling
 624                  * this is the case of the target file already existing
 625                  * so we unlink before doing the rename
 626                  */
 627                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
 628                 if (nrgd)
 629                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 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_inode.i_mode)) {
 650                         if (nip->i_di.di_entries < 2) {
 651                                 if (gfs2_consist_inode(nip))
 652                                         gfs2_dinode_print(nip);
 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 = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
 663                 if (error)
 664                         goto out_gunlock;
 665
 666                 error = gfs2_dir_check(ndir, &ndentry->d_name, 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_inode.i_nlink) {
 679                                 error = -EINVAL;
 680                                 goto out_gunlock;
 681                         }
 682                         if (ndip->i_di.di_entries == (u32)-1) {
 683                                 error = -EFBIG;
 684                                 goto out_gunlock;
 685                         }
 686                         if (S_ISDIR(ip->i_inode.i_mode) &&
 687                             ndip->i_inode.i_nlink == (u32)-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 = permission(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_inode.i_uid, ndip->i_inode.i_gid);
 715                 if (error)
 716                         goto out_gunlock_q;
 717
 718                 al->al_requested = sdp->sd_max_dirres;
 719
 720                 error = gfs2_inplace_reserve(ndip);
 721                 if (error)
 722                         goto out_gunlock_q;
 723
 724                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 725                                          al->al_rgd->rd_length +
 726                                          4 * RES_DINODE + 4 * RES_LEAF +
 727                                          RES_STATFS + RES_QUOTA + 4, 0);
 728                 if (error)
 729                         goto out_ipreserv;
 730         } else {
 731                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 732                                          5 * RES_LEAF + 4, 0);
 733                 if (error)
 734                         goto out_gunlock;
 735         }
 736
 737         /* Remove the target file, if it exists */
 738
 739         if (nip) {
 740                 if (S_ISDIR(nip->i_inode.i_mode))
 741                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 742                 else {
 743                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 744                         if (error)
 745                                 goto out_end_trans;
 746                         error = gfs2_change_nlink(nip, -1);
 747                 }
 748                 if (error)
 749                         goto out_end_trans;
 750         }
 751
 752         if (dir_rename) {
 753                 struct qstr name;
 754                 gfs2_str2qstr(&name, "..");
 755
 756                 error = gfs2_change_nlink(ndip, +1);
 757                 if (error)
 758                         goto out_end_trans;
 759                 error = gfs2_change_nlink(odip, -1);
 760                 if (error)
 761                         goto out_end_trans;
 762
 763                 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
 764                 if (error)
 765                         goto out_end_trans;
 766         } else {
 767                 struct buffer_head *dibh;
 768                 error = gfs2_meta_inode_buffer(ip, &dibh);
 769                 if (error)
 770                         goto out_end_trans;
 771                 ip->i_inode.i_ctime = CURRENT_TIME;
 772                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 773                 gfs2_dinode_out(ip, dibh->b_data);
 774                 brelse(dibh);
 775         }
 776
 777         error = gfs2_dir_del(odip, &odentry->d_name);
 778         if (error)
 779                 goto out_end_trans;
 780
 781         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
 782         if (error)
 783                 goto out_end_trans;
 784
 785 out_end_trans:
 786         gfs2_trans_end(sdp);
 787 out_ipreserv:
 788         if (alloc_required)
 789                 gfs2_inplace_release(ndip);
 790 out_gunlock_q:
 791         if (alloc_required)
 792                 gfs2_quota_unlock(ndip);
 793 out_alloc:
 794         if (alloc_required)
 795                 gfs2_alloc_put(ndip);
 796 out_gunlock:
 797         gfs2_glock_dq_m(num_gh, ghs);
 798 out_uninit:
 799         for (x = 0; x < num_gh; x++)
 800                 gfs2_holder_uninit(ghs + x);
 801 out_gunlock_r:
 802         if (dir_rename)
 803                 gfs2_glock_dq_uninit(&r_gh);
 804 out:
 805         return error;
 806 }
 807
 808 /**
 809  * gfs2_readlink - Read the value of a symlink
 810  * @dentry: the symlink
 811  * @buf: the buffer to read the symlink data into
 812  * @size: the size of the buffer
 813  *
 814  * Returns: errno
 815  */
 816
 817 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 818                          int user_size)
 819 {
 820         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 821         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 822         unsigned int len = GFS2_FAST_NAME_SIZE;
 823         int error;
 824
 825         error = gfs2_readlinki(ip, &buf, &len);
 826         if (error)
 827                 return error;
 828
 829         if (user_size > len - 1)
 830                 user_size = len - 1;
 831
 832         if (copy_to_user(user_buf, buf, user_size))
 833                 error = -EFAULT;
 834         else
 835                 error = user_size;
 836
 837         if (buf != array)
 838                 kfree(buf);
 839
 840         return error;
 841 }
 842
 843 /**
 844  * gfs2_follow_link - Follow a symbolic link
 845  * @dentry: The dentry of the link
 846  * @nd: Data that we pass to vfs_follow_link()
 847  *
 848  * This can handle symlinks of any size. It is optimised for symlinks
 849  * under GFS2_FAST_NAME_SIZE.
 850  *
 851  * Returns: 0 on success or error code
 852  */
 853
 854 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 855 {
 856         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 857         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 858         unsigned int len = GFS2_FAST_NAME_SIZE;
 859         int error;
 860
 861         error = gfs2_readlinki(ip, &buf, &len);
 862         if (!error) {
 863                 error = vfs_follow_link(nd, buf);
 864                 if (buf != array)
 865                         kfree(buf);
 866         }
 867
 868         return ERR_PTR(error);
 869 }
 870
 871 /**
 872  * gfs2_permission -
 873  * @inode:
 874  * @mask:
 875  * @nd: passed from Linux VFS, ignored by us
 876  *
 877  * This may be called from the VFS directly, or from within GFS2 with the
 878  * inode locked, so we look to see if the glock is already locked and only
 879  * lock the glock if its not already been done.
 880  *
 881  * Returns: errno
 882  */
 883
 884 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
 885 {
 886         struct gfs2_inode *ip = GFS2_I(inode);
 887         struct gfs2_holder i_gh;
 888         int error;
 889         int unlock = 0;
 890
 891         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
 892                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 893                 if (error)
 894                         return error;
 895                 unlock = 1;
 896         }
 897
 898         error = generic_permission(inode, mask, gfs2_check_acl);
 899         if (unlock)
 900                 gfs2_glock_dq_uninit(&i_gh);
 901
 902         return error;
 903 }
 904
 905 static int setattr_size(struct inode *inode, struct iattr *attr)
 906 {
 907         struct gfs2_inode *ip = GFS2_I(inode);
 908         int error;
 909
 910         if (attr->ia_size != ip->i_di.di_size) {
 911                 error = vmtruncate(inode, attr->ia_size);
 912                 if (error)
 913                         return error;
 914         }
 915
 916         error = gfs2_truncatei(ip, attr->ia_size);
 917         if (error && (inode->i_size != ip->i_di.di_size))
 918                 i_size_write(inode, ip->i_di.di_size);
 919
 920         return error;
 921 }
 922
 923 static int setattr_chown(struct inode *inode, struct iattr *attr)
 924 {
 925         struct gfs2_inode *ip = GFS2_I(inode);
 926         struct gfs2_sbd *sdp = GFS2_SB(inode);
 927         struct buffer_head *dibh;
 928         u32 ouid, ogid, nuid, ngid;
 929         int error;
 930
 931         ouid = inode->i_uid;
 932         ogid = inode->i_gid;
 933         nuid = attr->ia_uid;
 934         ngid = attr->ia_gid;
 935
 936         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
 937                 ouid = nuid = NO_QUOTA_CHANGE;
 938         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
 939                 ogid = ngid = NO_QUOTA_CHANGE;
 940
 941         gfs2_alloc_get(ip);
 942
 943         error = gfs2_quota_lock(ip, nuid, ngid);
 944         if (error)
 945                 goto out_alloc;
 946
 947         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 948                 error = gfs2_quota_check(ip, nuid, ngid);
 949                 if (error)
 950                         goto out_gunlock_q;
 951         }
 952
 953         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
 954         if (error)
 955                 goto out_gunlock_q;
 956
 957         error = gfs2_meta_inode_buffer(ip, &dibh);
 958         if (error)
 959                 goto out_end_trans;
 960
 961         error = inode_setattr(inode, attr);
 962         gfs2_assert_warn(sdp, !error);
 963
 964         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 965         gfs2_dinode_out(ip, dibh->b_data);
 966         brelse(dibh);
 967
 968         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 969                 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
 970                 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
 971         }
 972
 973 out_end_trans:
 974         gfs2_trans_end(sdp);
 975 out_gunlock_q:
 976         gfs2_quota_unlock(ip);
 977 out_alloc:
 978         gfs2_alloc_put(ip);
 979         return error;
 980 }
 981
 982 /**
 983  * gfs2_setattr - Change attributes on an inode
 984  * @dentry: The dentry which is changing
 985  * @attr: The structure describing the change
 986  *
 987  * The VFS layer wants to change one or more of an inodes attributes.  Write
 988  * that change out to disk.
 989  *
 990  * Returns: errno
 991  */
 992
 993 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
 994 {
 995         struct inode *inode = dentry->d_inode;
 996         struct gfs2_inode *ip = GFS2_I(inode);
 997         struct gfs2_holder i_gh;
 998         int error;
 999
1000         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1001         if (error)
1002                 return error;
1003
1004         error = -EPERM;
1005         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1006                 goto out;
1007
1008         error = inode_change_ok(inode, attr);
1009         if (error)
1010                 goto out;
1011
1012         if (attr->ia_valid & ATTR_SIZE)
1013                 error = setattr_size(inode, attr);
1014         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1015                 error = setattr_chown(inode, attr);
1016         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1017                 error = gfs2_acl_chmod(ip, attr);
1018         else
1019                 error = gfs2_setattr_simple(ip, attr);
1020
1021 out:
1022         gfs2_glock_dq_uninit(&i_gh);
1023         if (!error)
1024                 mark_inode_dirty(inode);
1025         return error;
1026 }
1027
1028 /**
1029  * gfs2_getattr - Read out an inode's attributes
1030  * @mnt: The vfsmount the inode is being accessed from
1031  * @dentry: The dentry to stat
1032  * @stat: The inode's stats
1033  *
1034  * This may be called from the VFS directly, or from within GFS2 with the
1035  * inode locked, so we look to see if the glock is already locked and only
1036  * lock the glock if its not already been done. Note that its the NFS
1037  * readdirplus operation which causes this to be called (from filldir)
1038  * with the glock already held.
1039  *
1040  * Returns: errno
1041  */
1042
1043 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1044                         struct kstat *stat)
1045 {
1046         struct inode *inode = dentry->d_inode;
1047         struct gfs2_inode *ip = GFS2_I(inode);
1048         struct gfs2_holder gh;
1049         int error;
1050         int unlock = 0;
1051
1052         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
1053                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1054                 if (error)
1055                         return error;
1056                 unlock = 1;
1057         }
1058
1059         generic_fillattr(inode, stat);
1060         if (unlock)
1061                 gfs2_glock_dq_uninit(&gh);
1062
1063         return 0;
1064 }
1065
1066 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1067                          const void *data, size_t size, int flags)
1068 {
1069         struct inode *inode = dentry->d_inode;
1070         struct gfs2_ea_request er;
1071
1072         memset(&er, 0, sizeof(struct gfs2_ea_request));
1073         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1074         if (er.er_type == GFS2_EATYPE_UNUSED)
1075                 return -EOPNOTSUPP;
1076         er.er_data = (char *)data;
1077         er.er_name_len = strlen(er.er_name);
1078         er.er_data_len = size;
1079         er.er_flags = flags;
1080
1081         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1082
1083         return gfs2_ea_set(GFS2_I(inode), &er);
1084 }
1085
1086 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1087                              void *data, size_t size)
1088 {
1089         struct gfs2_ea_request er;
1090
1091         memset(&er, 0, sizeof(struct gfs2_ea_request));
1092         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1093         if (er.er_type == GFS2_EATYPE_UNUSED)
1094                 return -EOPNOTSUPP;
1095         er.er_data = data;
1096         er.er_name_len = strlen(er.er_name);
1097         er.er_data_len = size;
1098
1099         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1100 }
1101
1102 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1103 {
1104         struct gfs2_ea_request er;
1105
1106         memset(&er, 0, sizeof(struct gfs2_ea_request));
1107         er.er_data = (size) ? buffer : NULL;
1108         er.er_data_len = size;
1109
1110         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1111 }
1112
1113 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1114 {
1115         struct gfs2_ea_request er;
1116
1117         memset(&er, 0, sizeof(struct gfs2_ea_request));
1118         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1119         if (er.er_type == GFS2_EATYPE_UNUSED)
1120                 return -EOPNOTSUPP;
1121         er.er_name_len = strlen(er.er_name);
1122
1123         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1124 }
1125
1126 const struct inode_operations gfs2_file_iops = {
1127         .permission = gfs2_permission,
1128         .setattr = gfs2_setattr,
1129         .getattr = gfs2_getattr,
1130         .setxattr = gfs2_setxattr,
1131         .getxattr = gfs2_getxattr,
1132         .listxattr = gfs2_listxattr,
1133         .removexattr = gfs2_removexattr,
1134 };
1135
1136 const struct inode_operations gfs2_dev_iops = {
1137         .permission = gfs2_permission,
1138         .setattr = gfs2_setattr,
1139         .getattr = gfs2_getattr,
1140         .setxattr = gfs2_setxattr,
1141         .getxattr = gfs2_getxattr,
1142         .listxattr = gfs2_listxattr,
1143         .removexattr = gfs2_removexattr,
1144 };
1145
1146 const struct inode_operations gfs2_dir_iops = {
1147         .create = gfs2_create,
1148         .lookup = gfs2_lookup,
1149         .link = gfs2_link,
1150         .unlink = gfs2_unlink,
1151         .symlink = gfs2_symlink,
1152         .mkdir = gfs2_mkdir,
1153         .rmdir = gfs2_rmdir,
1154         .mknod = gfs2_mknod,
1155         .rename = gfs2_rename,
1156         .permission = gfs2_permission,
1157         .setattr = gfs2_setattr,
1158         .getattr = gfs2_getattr,
1159         .setxattr = gfs2_setxattr,
1160         .getxattr = gfs2_getxattr,
1161         .listxattr = gfs2_listxattr,
1162         .removexattr = gfs2_removexattr,
1163 };
1164
1165 const struct inode_operations gfs2_symlink_iops = {
1166         .readlink = gfs2_readlink,
1167         .follow_link = gfs2_follow_link,
1168         .permission = gfs2_permission,
1169         .setattr = gfs2_setattr,
1170         .getattr = gfs2_getattr,
1171         .setxattr = gfs2_setxattr,
1172         .getxattr = gfs2_getxattr,
1173         .listxattr = gfs2_listxattr,
1174         .removexattr = gfs2_removexattr,
1175 };
1176