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->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_search(dir, &dentry->d_name, NULL, 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_ri.ri_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->i_num,
 221                              IF2DT(inode->i_mode));
 222         if (error)
 223                 goto out_end_trans;
 224
 225         error = gfs2_change_nlink(ip, +1);
 226
 227 out_end_trans:
 228         gfs2_trans_end(sdp);
 229 out_ipres:
 230         if (alloc_required)
 231                 gfs2_inplace_release(dip);
 232 out_gunlock_q:
 233         if (alloc_required)
 234                 gfs2_quota_unlock(dip);
 235 out_alloc:
 236         if (alloc_required)
 237                 gfs2_alloc_put(dip);
 238 out_gunlock:
 239         gfs2_glock_dq_m(2, ghs);
 240 out:
 241         gfs2_holder_uninit(ghs);
 242         gfs2_holder_uninit(ghs + 1);
 243         if (!error) {
 244                 atomic_inc(&inode->i_count);
 245                 d_instantiate(dentry, inode);
 246                 mark_inode_dirty(inode);
 247         }
 248         return error;
 249 }
 250
 251 /**
 252  * gfs2_unlink - Unlink a file
 253  * @dir: The inode of the directory containing the file to unlink
 254  * @dentry: The file itself
 255  *
 256  * Unlink a file.  Call gfs2_unlinki()
 257  *
 258  * Returns: errno
 259  */
 260
 261 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 262 {
 263         struct gfs2_inode *dip = GFS2_I(dir);
 264         struct gfs2_sbd *sdp = GFS2_SB(dir);
 265         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 266         struct gfs2_holder ghs[3];
 267         struct gfs2_rgrpd *rgd;
 268         struct gfs2_holder ri_gh;
 269         int error;
 270
 271         error = gfs2_rindex_hold(sdp, &ri_gh);
 272         if (error)
 273                 return error;
 274
 275         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 276         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
 277
 278         rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
 279         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 280
 281
 282         error = gfs2_glock_nq_m(3, ghs);
 283         if (error)
 284                 goto out;
 285
 286         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 287         if (error)
 288                 goto out_gunlock;
 289
 290         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 291         if (error)
 292                 goto out_gunlock;
 293
 294         error = gfs2_dir_del(dip, &dentry->d_name);
 295         if (error)
 296                 goto out_end_trans;
 297
 298         error = gfs2_change_nlink(ip, -1);
 299
 300 out_end_trans:
 301         gfs2_trans_end(sdp);
 302 out_gunlock:
 303         gfs2_glock_dq_m(3, ghs);
 304 out:
 305         gfs2_holder_uninit(ghs);
 306         gfs2_holder_uninit(ghs + 1);
 307         gfs2_holder_uninit(ghs + 2);
 308         gfs2_glock_dq_uninit(&ri_gh);
 309         return error;
 310 }
 311
 312 /**
 313  * gfs2_symlink - Create a symlink
 314  * @dir: The directory to create the symlink in
 315  * @dentry: The dentry to put the symlink in
 316  * @symname: The thing which the link points to
 317  *
 318  * Returns: errno
 319  */
 320
 321 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 322                         const char *symname)
 323 {
 324         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 325         struct gfs2_sbd *sdp = GFS2_SB(dir);
 326         struct gfs2_holder ghs[2];
 327         struct inode *inode;
 328         struct buffer_head *dibh;
 329         int size;
 330         int error;
 331
 332         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 333         size = strlen(symname);
 334         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 335                 return -ENAMETOOLONG;
 336
 337         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 338
 339         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 340         if (IS_ERR(inode)) {
 341                 gfs2_holder_uninit(ghs);
 342                 return PTR_ERR(inode);
 343         }
 344
 345         ip = ghs[1].gh_gl->gl_object;
 346
 347         ip->i_di.di_size = size;
 348
 349         error = gfs2_meta_inode_buffer(ip, &dibh);
 350
 351         if (!gfs2_assert_withdraw(sdp, !error)) {
 352                 gfs2_dinode_out(ip, dibh->b_data);
 353                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 354                        size);
 355                 brelse(dibh);
 356         }
 357
 358         gfs2_trans_end(sdp);
 359         if (dip->i_alloc.al_rgd)
 360                 gfs2_inplace_release(dip);
 361         gfs2_quota_unlock(dip);
 362         gfs2_alloc_put(dip);
 363
 364         gfs2_glock_dq_uninit_m(2, ghs);
 365
 366         d_instantiate(dentry, inode);
 367         mark_inode_dirty(inode);
 368
 369         return 0;
 370 }
 371
 372 /**
 373  * gfs2_mkdir - Make a directory
 374  * @dir: The parent directory of the new one
 375  * @dentry: The dentry of the new directory
 376  * @mode: The mode of the new directory
 377  *
 378  * Returns: errno
 379  */
 380
 381 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 382 {
 383         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 384         struct gfs2_sbd *sdp = GFS2_SB(dir);
 385         struct gfs2_holder ghs[2];
 386         struct inode *inode;
 387         struct buffer_head *dibh;
 388         int error;
 389
 390         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 391
 392         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 393         if (IS_ERR(inode)) {
 394                 gfs2_holder_uninit(ghs);
 395                 return PTR_ERR(inode);
 396         }
 397
 398         ip = ghs[1].gh_gl->gl_object;
 399
 400         ip->i_inode.i_nlink = 2;
 401         ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 402         ip->i_di.di_flags |= GFS2_DIF_JDATA;
 403         ip->i_di.di_entries = 2;
 404
 405         error = gfs2_meta_inode_buffer(ip, &dibh);
 406
 407         if (!gfs2_assert_withdraw(sdp, !error)) {
 408                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 409                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 410                 struct qstr str;
 411
 412                 gfs2_str2qstr(&str, ".");
 413                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 414                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 415                 dent->de_inum = di->di_num; /* already GFS2 endian */
 416                 dent->de_type = cpu_to_be16(DT_DIR);
 417                 di->di_entries = cpu_to_be32(1);
 418
 419                 gfs2_str2qstr(&str, "..");
 420                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 421                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 422
 423                 gfs2_inum_out(&dip->i_num, &dent->de_inum);
 424                 dent->de_type = cpu_to_be16(DT_DIR);
 425
 426                 gfs2_dinode_out(ip, di);
 427
 428                 brelse(dibh);
 429         }
 430
 431         error = gfs2_change_nlink(dip, +1);
 432         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 433
 434         gfs2_trans_end(sdp);
 435         if (dip->i_alloc.al_rgd)
 436                 gfs2_inplace_release(dip);
 437         gfs2_quota_unlock(dip);
 438         gfs2_alloc_put(dip);
 439
 440         gfs2_glock_dq_uninit_m(2, ghs);
 441
 442         d_instantiate(dentry, inode);
 443         mark_inode_dirty(inode);
 444
 445         return 0;
 446 }
 447
 448 /**
 449  * gfs2_rmdir - Remove a directory
 450  * @dir: The parent directory of the directory to be removed
 451  * @dentry: The dentry of the directory to remove
 452  *
 453  * Remove a directory. Call gfs2_rmdiri()
 454  *
 455  * Returns: errno
 456  */
 457
 458 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 459 {
 460         struct gfs2_inode *dip = GFS2_I(dir);
 461         struct gfs2_sbd *sdp = GFS2_SB(dir);
 462         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 463         struct gfs2_holder ghs[3];
 464         struct gfs2_rgrpd *rgd;
 465         struct gfs2_holder ri_gh;
 466         int error;
 467
 468
 469         error = gfs2_rindex_hold(sdp, &ri_gh);
 470         if (error)
 471                 return error;
 472         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 473         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 474
 475         rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
 476         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 477
 478         error = gfs2_glock_nq_m(3, ghs);
 479         if (error)
 480                 goto out;
 481
 482         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 483         if (error)
 484                 goto out_gunlock;
 485
 486         if (ip->i_di.di_entries < 2) {
 487                 if (gfs2_consist_inode(ip))
 488                         gfs2_dinode_print(ip);
 489                 error = -EIO;
 490                 goto out_gunlock;
 491         }
 492         if (ip->i_di.di_entries > 2) {
 493                 error = -ENOTEMPTY;
 494                 goto out_gunlock;
 495         }
 496
 497         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 498         if (error)
 499                 goto out_gunlock;
 500
 501         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 502
 503         gfs2_trans_end(sdp);
 504
 505 out_gunlock:
 506         gfs2_glock_dq_m(3, ghs);
 507 out:
 508         gfs2_holder_uninit(ghs);
 509         gfs2_holder_uninit(ghs + 1);
 510         gfs2_holder_uninit(ghs + 2);
 511         gfs2_glock_dq_uninit(&ri_gh);
 512         return error;
 513 }
 514
 515 /**
 516  * gfs2_mknod - Make a special file
 517  * @dir: The directory in which the special file will reside
 518  * @dentry: The dentry of the special file
 519  * @mode: The mode of the special file
 520  * @rdev: The device specification of the special file
 521  *
 522  */
 523
 524 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 525                       dev_t dev)
 526 {
 527         struct gfs2_inode *dip = GFS2_I(dir);
 528         struct gfs2_sbd *sdp = GFS2_SB(dir);
 529         struct gfs2_holder ghs[2];
 530         struct inode *inode;
 531
 532         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 533
 534         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 535         if (IS_ERR(inode)) {
 536                 gfs2_holder_uninit(ghs);
 537                 return PTR_ERR(inode);
 538         }
 539
 540         gfs2_trans_end(sdp);
 541         if (dip->i_alloc.al_rgd)
 542                 gfs2_inplace_release(dip);
 543         gfs2_quota_unlock(dip);
 544         gfs2_alloc_put(dip);
 545
 546         gfs2_glock_dq_uninit_m(2, ghs);
 547
 548         d_instantiate(dentry, inode);
 549         mark_inode_dirty(inode);
 550
 551         return 0;
 552 }
 553
 554 /**
 555  * gfs2_rename - Rename a file
 556  * @odir: Parent directory of old file name
 557  * @odentry: The old dentry of the file
 558  * @ndir: Parent directory of new file name
 559  * @ndentry: The new dentry of the file
 560  *
 561  * Returns: errno
 562  */
 563
 564 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 565                        struct inode *ndir, struct dentry *ndentry)
 566 {
 567         struct gfs2_inode *odip = GFS2_I(odir);
 568         struct gfs2_inode *ndip = GFS2_I(ndir);
 569         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 570         struct gfs2_inode *nip = NULL;
 571         struct gfs2_sbd *sdp = GFS2_SB(odir);
 572         struct gfs2_holder ghs[5], r_gh;
 573         struct gfs2_rgrpd *nrgd;
 574         unsigned int num_gh;
 575         int dir_rename = 0;
 576         int alloc_required;
 577         unsigned int x;
 578         int error;
 579
 580         if (ndentry->d_inode) {
 581                 nip = GFS2_I(ndentry->d_inode);
 582                 if (ip == nip)
 583                         return 0;
 584         }
 585
 586         /* Make sure we aren't trying to move a dirctory into it's subdir */
 587
 588         if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
 589                 dir_rename = 1;
 590
 591                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
 592                                            &r_gh);
 593                 if (error)
 594                         goto out;
 595
 596                 error = gfs2_ok_to_move(ip, ndip);
 597                 if (error)
 598                         goto out_gunlock_r;
 599         }
 600
 601         num_gh = 1;
 602         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 603         if (odip != ndip) {
 604                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 605                 num_gh++;
 606         }
 607         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 608         num_gh++;
 609
 610         if (nip) {
 611                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 612                 num_gh++;
 613                 /* grab the resource lock for unlink flag twiddling
 614                  * this is the case of the target file already existing
 615                  * so we unlink before doing the rename
 616                  */
 617                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_num.no_addr);
 618                 if (nrgd)
 619                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
 620         }
 621
 622         error = gfs2_glock_nq_m(num_gh, ghs);
 623         if (error)
 624                 goto out_uninit;
 625
 626         /* Check out the old directory */
 627
 628         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 629         if (error)
 630                 goto out_gunlock;
 631
 632         /* Check out the new directory */
 633
 634         if (nip) {
 635                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 636                 if (error)
 637                         goto out_gunlock;
 638
 639                 if (S_ISDIR(nip->i_inode.i_mode)) {
 640                         if (nip->i_di.di_entries < 2) {
 641                                 if (gfs2_consist_inode(nip))
 642                                         gfs2_dinode_print(nip);
 643                                 error = -EIO;
 644                                 goto out_gunlock;
 645                         }
 646                         if (nip->i_di.di_entries > 2) {
 647                                 error = -ENOTEMPTY;
 648                                 goto out_gunlock;
 649                         }
 650                 }
 651         } else {
 652                 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
 653                 if (error)
 654                         goto out_gunlock;
 655
 656                 error = gfs2_dir_search(ndir, &ndentry->d_name, NULL, NULL);
 657                 switch (error) {
 658                 case -ENOENT:
 659                         error = 0;
 660                         break;
 661                 case 0:
 662                         error = -EEXIST;
 663                 default:
 664                         goto out_gunlock;
 665                 };
 666
 667                 if (odip != ndip) {
 668                         if (!ndip->i_inode.i_nlink) {
 669                                 error = -EINVAL;
 670                                 goto out_gunlock;
 671                         }
 672                         if (ndip->i_di.di_entries == (u32)-1) {
 673                                 error = -EFBIG;
 674                                 goto out_gunlock;
 675                         }
 676                         if (S_ISDIR(ip->i_inode.i_mode) &&
 677                             ndip->i_inode.i_nlink == (u32)-1) {
 678                                 error = -EMLINK;
 679                                 goto out_gunlock;
 680                         }
 681                 }
 682         }
 683
 684         /* Check out the dir to be renamed */
 685
 686         if (dir_rename) {
 687                 error = permission(odentry->d_inode, MAY_WRITE, NULL);
 688                 if (error)
 689                         goto out_gunlock;
 690         }
 691
 692         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 693         if (error < 0)
 694                 goto out_gunlock;
 695         error = 0;
 696
 697         if (alloc_required) {
 698                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 699
 700                 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 701                 if (error)
 702                         goto out_alloc;
 703
 704                 error = gfs2_quota_check(ndip, ndip->i_inode.i_uid, ndip->i_inode.i_gid);
 705                 if (error)
 706                         goto out_gunlock_q;
 707
 708                 al->al_requested = sdp->sd_max_dirres;
 709
 710                 error = gfs2_inplace_reserve(ndip);
 711                 if (error)
 712                         goto out_gunlock_q;
 713
 714                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 715                                          al->al_rgd->rd_ri.ri_length +
 716                                          4 * RES_DINODE + 4 * RES_LEAF +
 717                                          RES_STATFS + RES_QUOTA + 4, 0);
 718                 if (error)
 719                         goto out_ipreserv;
 720         } else {
 721                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 722                                          5 * RES_LEAF + 4, 0);
 723                 if (error)
 724                         goto out_gunlock;
 725         }
 726
 727         /* Remove the target file, if it exists */
 728
 729         if (nip) {
 730                 if (S_ISDIR(nip->i_inode.i_mode))
 731                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 732                 else {
 733                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 734                         if (error)
 735                                 goto out_end_trans;
 736                         error = gfs2_change_nlink(nip, -1);
 737                 }
 738                 if (error)
 739                         goto out_end_trans;
 740         }
 741
 742         if (dir_rename) {
 743                 struct qstr name;
 744                 gfs2_str2qstr(&name, "..");
 745
 746                 error = gfs2_change_nlink(ndip, +1);
 747                 if (error)
 748                         goto out_end_trans;
 749                 error = gfs2_change_nlink(odip, -1);
 750                 if (error)
 751                         goto out_end_trans;
 752
 753                 error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
 754                 if (error)
 755                         goto out_end_trans;
 756         } else {
 757                 struct buffer_head *dibh;
 758                 error = gfs2_meta_inode_buffer(ip, &dibh);
 759                 if (error)
 760                         goto out_end_trans;
 761                 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
 762                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 763                 gfs2_dinode_out(ip, dibh->b_data);
 764                 brelse(dibh);
 765         }
 766
 767         error = gfs2_dir_del(odip, &odentry->d_name);
 768         if (error)
 769                 goto out_end_trans;
 770
 771         error = gfs2_dir_add(ndir, &ndentry->d_name, &ip->i_num,
 772                              IF2DT(ip->i_inode.i_mode));
 773         if (error)
 774                 goto out_end_trans;
 775
 776 out_end_trans:
 777         gfs2_trans_end(sdp);
 778 out_ipreserv:
 779         if (alloc_required)
 780                 gfs2_inplace_release(ndip);
 781 out_gunlock_q:
 782         if (alloc_required)
 783                 gfs2_quota_unlock(ndip);
 784 out_alloc:
 785         if (alloc_required)
 786                 gfs2_alloc_put(ndip);
 787 out_gunlock:
 788         gfs2_glock_dq_m(num_gh, ghs);
 789 out_uninit:
 790         for (x = 0; x < num_gh; x++)
 791                 gfs2_holder_uninit(ghs + x);
 792 out_gunlock_r:
 793         if (dir_rename)
 794                 gfs2_glock_dq_uninit(&r_gh);
 795 out:
 796         return error;
 797 }
 798
 799 /**
 800  * gfs2_readlink - Read the value of a symlink
 801  * @dentry: the symlink
 802  * @buf: the buffer to read the symlink data into
 803  * @size: the size of the buffer
 804  *
 805  * Returns: errno
 806  */
 807
 808 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 809                          int user_size)
 810 {
 811         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 812         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 813         unsigned int len = GFS2_FAST_NAME_SIZE;
 814         int error;
 815
 816         error = gfs2_readlinki(ip, &buf, &len);
 817         if (error)
 818                 return error;
 819
 820         if (user_size > len - 1)
 821                 user_size = len - 1;
 822
 823         if (copy_to_user(user_buf, buf, user_size))
 824                 error = -EFAULT;
 825         else
 826                 error = user_size;
 827
 828         if (buf != array)
 829                 kfree(buf);
 830
 831         return error;
 832 }
 833
 834 /**
 835  * gfs2_follow_link - Follow a symbolic link
 836  * @dentry: The dentry of the link
 837  * @nd: Data that we pass to vfs_follow_link()
 838  *
 839  * This can handle symlinks of any size. It is optimised for symlinks
 840  * under GFS2_FAST_NAME_SIZE.
 841  *
 842  * Returns: 0 on success or error code
 843  */
 844
 845 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 846 {
 847         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 848         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 849         unsigned int len = GFS2_FAST_NAME_SIZE;
 850         int error;
 851
 852         error = gfs2_readlinki(ip, &buf, &len);
 853         if (!error) {
 854                 error = vfs_follow_link(nd, buf);
 855                 if (buf != array)
 856                         kfree(buf);
 857         }
 858
 859         return ERR_PTR(error);
 860 }
 861
 862 /**
 863  * gfs2_permission -
 864  * @inode:
 865  * @mask:
 866  * @nd: passed from Linux VFS, ignored by us
 867  *
 868  * This may be called from the VFS directly, or from within GFS2 with the
 869  * inode locked, so we look to see if the glock is already locked and only
 870  * lock the glock if its not already been done.
 871  *
 872  * Returns: errno
 873  */
 874
 875 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
 876 {
 877         struct gfs2_inode *ip = GFS2_I(inode);
 878         struct gfs2_holder i_gh;
 879         int error;
 880         int unlock = 0;
 881
 882         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
 883                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 884                 if (error)
 885                         return error;
 886                 unlock = 1;
 887         }
 888
 889         error = generic_permission(inode, mask, gfs2_check_acl);
 890         if (unlock)
 891                 gfs2_glock_dq_uninit(&i_gh);
 892
 893         return error;
 894 }
 895
 896 static int setattr_size(struct inode *inode, struct iattr *attr)
 897 {
 898         struct gfs2_inode *ip = GFS2_I(inode);
 899         int error;
 900
 901         if (attr->ia_size != ip->i_di.di_size) {
 902                 error = vmtruncate(inode, attr->ia_size);
 903                 if (error)
 904                         return error;
 905         }
 906
 907         error = gfs2_truncatei(ip, attr->ia_size);
 908         if (error)
 909                 return error;
 910
 911         return error;
 912 }
 913
 914 static int setattr_chown(struct inode *inode, struct iattr *attr)
 915 {
 916         struct gfs2_inode *ip = GFS2_I(inode);
 917         struct gfs2_sbd *sdp = GFS2_SB(inode);
 918         struct buffer_head *dibh;
 919         u32 ouid, ogid, nuid, ngid;
 920         int error;
 921
 922         ouid = inode->i_uid;
 923         ogid = inode->i_gid;
 924         nuid = attr->ia_uid;
 925         ngid = attr->ia_gid;
 926
 927         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
 928                 ouid = nuid = NO_QUOTA_CHANGE;
 929         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
 930                 ogid = ngid = NO_QUOTA_CHANGE;
 931
 932         gfs2_alloc_get(ip);
 933
 934         error = gfs2_quota_lock(ip, nuid, ngid);
 935         if (error)
 936                 goto out_alloc;
 937
 938         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 939                 error = gfs2_quota_check(ip, nuid, ngid);
 940                 if (error)
 941                         goto out_gunlock_q;
 942         }
 943
 944         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
 945         if (error)
 946                 goto out_gunlock_q;
 947
 948         error = gfs2_meta_inode_buffer(ip, &dibh);
 949         if (error)
 950                 goto out_end_trans;
 951
 952         error = inode_setattr(inode, attr);
 953         gfs2_assert_warn(sdp, !error);
 954
 955         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 956         gfs2_dinode_out(ip, dibh->b_data);
 957         brelse(dibh);
 958
 959         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 960                 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
 961                 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
 962         }
 963
 964 out_end_trans:
 965         gfs2_trans_end(sdp);
 966 out_gunlock_q:
 967         gfs2_quota_unlock(ip);
 968 out_alloc:
 969         gfs2_alloc_put(ip);
 970         return error;
 971 }
 972
 973 /**
 974  * gfs2_setattr - Change attributes on an inode
 975  * @dentry: The dentry which is changing
 976  * @attr: The structure describing the change
 977  *
 978  * The VFS layer wants to change one or more of an inodes attributes.  Write
 979  * that change out to disk.
 980  *
 981  * Returns: errno
 982  */
 983
 984 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
 985 {
 986         struct inode *inode = dentry->d_inode;
 987         struct gfs2_inode *ip = GFS2_I(inode);
 988         struct gfs2_holder i_gh;
 989         int error;
 990
 991         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 992         if (error)
 993                 return error;
 994
 995         error = -EPERM;
 996         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 997                 goto out;
 998
 999         error = inode_change_ok(inode, attr);
1000         if (error)
1001                 goto out;
1002
1003         if (attr->ia_valid & ATTR_SIZE)
1004                 error = setattr_size(inode, attr);
1005         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1006                 error = setattr_chown(inode, attr);
1007         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1008                 error = gfs2_acl_chmod(ip, attr);
1009         else
1010                 error = gfs2_setattr_simple(ip, attr);
1011
1012 out:
1013         gfs2_glock_dq_uninit(&i_gh);
1014         if (!error)
1015                 mark_inode_dirty(inode);
1016         return error;
1017 }
1018
1019 /**
1020  * gfs2_getattr - Read out an inode's attributes
1021  * @mnt: The vfsmount the inode is being accessed from
1022  * @dentry: The dentry to stat
1023  * @stat: The inode's stats
1024  *
1025  * This may be called from the VFS directly, or from within GFS2 with the
1026  * inode locked, so we look to see if the glock is already locked and only
1027  * lock the glock if its not already been done. Note that its the NFS
1028  * readdirplus operation which causes this to be called (from filldir)
1029  * with the glock already held.
1030  *
1031  * Returns: errno
1032  */
1033
1034 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1035                         struct kstat *stat)
1036 {
1037         struct inode *inode = dentry->d_inode;
1038         struct gfs2_inode *ip = GFS2_I(inode);
1039         struct gfs2_holder gh;
1040         int error;
1041         int unlock = 0;
1042
1043         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
1044                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1045                 if (error)
1046                         return error;
1047                 unlock = 1;
1048         }
1049
1050         generic_fillattr(inode, stat);
1051         if (unlock)
1052                 gfs2_glock_dq_uninit(&gh);
1053
1054         return 0;
1055 }
1056
1057 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1058                          const void *data, size_t size, int flags)
1059 {
1060         struct inode *inode = dentry->d_inode;
1061         struct gfs2_ea_request er;
1062
1063         memset(&er, 0, sizeof(struct gfs2_ea_request));
1064         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1065         if (er.er_type == GFS2_EATYPE_UNUSED)
1066                 return -EOPNOTSUPP;
1067         er.er_data = (char *)data;
1068         er.er_name_len = strlen(er.er_name);
1069         er.er_data_len = size;
1070         er.er_flags = flags;
1071
1072         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1073
1074         return gfs2_ea_set(GFS2_I(inode), &er);
1075 }
1076
1077 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1078                              void *data, size_t size)
1079 {
1080         struct gfs2_ea_request er;
1081
1082         memset(&er, 0, sizeof(struct gfs2_ea_request));
1083         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1084         if (er.er_type == GFS2_EATYPE_UNUSED)
1085                 return -EOPNOTSUPP;
1086         er.er_data = data;
1087         er.er_name_len = strlen(er.er_name);
1088         er.er_data_len = size;
1089
1090         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1091 }
1092
1093 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1094 {
1095         struct gfs2_ea_request er;
1096
1097         memset(&er, 0, sizeof(struct gfs2_ea_request));
1098         er.er_data = (size) ? buffer : NULL;
1099         er.er_data_len = size;
1100
1101         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1102 }
1103
1104 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1105 {
1106         struct gfs2_ea_request er;
1107
1108         memset(&er, 0, sizeof(struct gfs2_ea_request));
1109         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1110         if (er.er_type == GFS2_EATYPE_UNUSED)
1111                 return -EOPNOTSUPP;
1112         er.er_name_len = strlen(er.er_name);
1113
1114         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1115 }
1116
1117 const struct inode_operations gfs2_file_iops = {
1118         .permission = gfs2_permission,
1119         .setattr = gfs2_setattr,
1120         .getattr = gfs2_getattr,
1121         .setxattr = gfs2_setxattr,
1122         .getxattr = gfs2_getxattr,
1123         .listxattr = gfs2_listxattr,
1124         .removexattr = gfs2_removexattr,
1125 };
1126
1127 const struct inode_operations gfs2_dev_iops = {
1128         .permission = gfs2_permission,
1129         .setattr = gfs2_setattr,
1130         .getattr = gfs2_getattr,
1131         .setxattr = gfs2_setxattr,
1132         .getxattr = gfs2_getxattr,
1133         .listxattr = gfs2_listxattr,
1134         .removexattr = gfs2_removexattr,
1135 };
1136
1137 const struct inode_operations gfs2_dir_iops = {
1138         .create = gfs2_create,
1139         .lookup = gfs2_lookup,
1140         .link = gfs2_link,
1141         .unlink = gfs2_unlink,
1142         .symlink = gfs2_symlink,
1143         .mkdir = gfs2_mkdir,
1144         .rmdir = gfs2_rmdir,
1145         .mknod = gfs2_mknod,
1146         .rename = gfs2_rename,
1147         .permission = gfs2_permission,
1148         .setattr = gfs2_setattr,
1149         .getattr = gfs2_getattr,
1150         .setxattr = gfs2_setxattr,
1151         .getxattr = gfs2_getxattr,
1152         .listxattr = gfs2_listxattr,
1153         .removexattr = gfs2_removexattr,
1154 };
1155
1156 const struct inode_operations gfs2_symlink_iops = {
1157         .readlink = gfs2_readlink,
1158         .follow_link = gfs2_follow_link,
1159         .permission = gfs2_permission,
1160         .setattr = gfs2_setattr,
1161         .getattr = gfs2_getattr,
1162         .setxattr = gfs2_setxattr,
1163         .getxattr = gfs2_getxattr,
1164         .listxattr = gfs2_listxattr,
1165         .removexattr = gfs2_removexattr,
1166 };
1167