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_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_m(3, 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(3, ghs);
 303 out:
 304         gfs2_holder_uninit(ghs);
 305         gfs2_holder_uninit(ghs + 1);
 306         gfs2_holder_uninit(ghs + 2);
 307         gfs2_glock_dq_uninit(&ri_gh);
 308         return error;
 309 }
 310
 311 /**
 312  * gfs2_symlink - Create a symlink
 313  * @dir: The directory to create the symlink in
 314  * @dentry: The dentry to put the symlink in
 315  * @symname: The thing which the link points to
 316  *
 317  * Returns: errno
 318  */
 319
 320 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 321                         const char *symname)
 322 {
 323         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 324         struct gfs2_sbd *sdp = GFS2_SB(dir);
 325         struct gfs2_holder ghs[2];
 326         struct inode *inode;
 327         struct buffer_head *dibh;
 328         int size;
 329         int error;
 330
 331         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 332         size = strlen(symname);
 333         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 334                 return -ENAMETOOLONG;
 335
 336         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 337
 338         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 339         if (IS_ERR(inode)) {
 340                 gfs2_holder_uninit(ghs);
 341                 return PTR_ERR(inode);
 342         }
 343
 344         ip = ghs[1].gh_gl->gl_object;
 345
 346         ip->i_di.di_size = size;
 347
 348         error = gfs2_meta_inode_buffer(ip, &dibh);
 349
 350         if (!gfs2_assert_withdraw(sdp, !error)) {
 351                 gfs2_dinode_out(ip, dibh->b_data);
 352                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 353                        size);
 354                 brelse(dibh);
 355         }
 356
 357         gfs2_trans_end(sdp);
 358         if (dip->i_alloc.al_rgd)
 359                 gfs2_inplace_release(dip);
 360         gfs2_quota_unlock(dip);
 361         gfs2_alloc_put(dip);
 362
 363         gfs2_glock_dq_uninit_m(2, ghs);
 364
 365         d_instantiate(dentry, inode);
 366         mark_inode_dirty(inode);
 367
 368         return 0;
 369 }
 370
 371 /**
 372  * gfs2_mkdir - Make a directory
 373  * @dir: The parent directory of the new one
 374  * @dentry: The dentry of the new directory
 375  * @mode: The mode of the new directory
 376  *
 377  * Returns: errno
 378  */
 379
 380 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 381 {
 382         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 383         struct gfs2_sbd *sdp = GFS2_SB(dir);
 384         struct gfs2_holder ghs[2];
 385         struct inode *inode;
 386         struct buffer_head *dibh;
 387         int error;
 388
 389         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 390
 391         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 392         if (IS_ERR(inode)) {
 393                 gfs2_holder_uninit(ghs);
 394                 return PTR_ERR(inode);
 395         }
 396
 397         ip = ghs[1].gh_gl->gl_object;
 398
 399         ip->i_inode.i_nlink = 2;
 400         ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 401         ip->i_di.di_flags |= GFS2_DIF_JDATA;
 402         ip->i_di.di_entries = 2;
 403
 404         error = gfs2_meta_inode_buffer(ip, &dibh);
 405
 406         if (!gfs2_assert_withdraw(sdp, !error)) {
 407                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 408                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 409                 struct qstr str;
 410
 411                 gfs2_str2qstr(&str, ".");
 412                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 413                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 414                 dent->de_inum = di->di_num; /* already GFS2 endian */
 415                 dent->de_type = cpu_to_be16(DT_DIR);
 416                 di->di_entries = cpu_to_be32(1);
 417
 418                 gfs2_str2qstr(&str, "..");
 419                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 420                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 421
 422                 gfs2_inum_out(dip, dent);
 423                 dent->de_type = cpu_to_be16(DT_DIR);
 424
 425                 gfs2_dinode_out(ip, di);
 426
 427                 brelse(dibh);
 428         }
 429
 430         error = gfs2_change_nlink(dip, +1);
 431         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 432
 433         gfs2_trans_end(sdp);
 434         if (dip->i_alloc.al_rgd)
 435                 gfs2_inplace_release(dip);
 436         gfs2_quota_unlock(dip);
 437         gfs2_alloc_put(dip);
 438
 439         gfs2_glock_dq_uninit_m(2, ghs);
 440
 441         d_instantiate(dentry, inode);
 442         mark_inode_dirty(inode);
 443
 444         return 0;
 445 }
 446
 447 /**
 448  * gfs2_rmdir - Remove a directory
 449  * @dir: The parent directory of the directory to be removed
 450  * @dentry: The dentry of the directory to remove
 451  *
 452  * Remove a directory. Call gfs2_rmdiri()
 453  *
 454  * Returns: errno
 455  */
 456
 457 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 458 {
 459         struct gfs2_inode *dip = GFS2_I(dir);
 460         struct gfs2_sbd *sdp = GFS2_SB(dir);
 461         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 462         struct gfs2_holder ghs[3];
 463         struct gfs2_rgrpd *rgd;
 464         struct gfs2_holder ri_gh;
 465         int error;
 466
 467
 468         error = gfs2_rindex_hold(sdp, &ri_gh);
 469         if (error)
 470                 return error;
 471         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 472         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 473
 474         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 475         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 476
 477         error = gfs2_glock_nq_m(3, ghs);
 478         if (error)
 479                 goto out;
 480
 481         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 482         if (error)
 483                 goto out_gunlock;
 484
 485         if (ip->i_di.di_entries < 2) {
 486                 if (gfs2_consist_inode(ip))
 487                         gfs2_dinode_print(ip);
 488                 error = -EIO;
 489                 goto out_gunlock;
 490         }
 491         if (ip->i_di.di_entries > 2) {
 492                 error = -ENOTEMPTY;
 493                 goto out_gunlock;
 494         }
 495
 496         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 497         if (error)
 498                 goto out_gunlock;
 499
 500         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 501
 502         gfs2_trans_end(sdp);
 503
 504 out_gunlock:
 505         gfs2_glock_dq_m(3, ghs);
 506 out:
 507         gfs2_holder_uninit(ghs);
 508         gfs2_holder_uninit(ghs + 1);
 509         gfs2_holder_uninit(ghs + 2);
 510         gfs2_glock_dq_uninit(&ri_gh);
 511         return error;
 512 }
 513
 514 /**
 515  * gfs2_mknod - Make a special file
 516  * @dir: The directory in which the special file will reside
 517  * @dentry: The dentry of the special file
 518  * @mode: The mode of the special file
 519  * @rdev: The device specification of the special file
 520  *
 521  */
 522
 523 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 524                       dev_t dev)
 525 {
 526         struct gfs2_inode *dip = GFS2_I(dir);
 527         struct gfs2_sbd *sdp = GFS2_SB(dir);
 528         struct gfs2_holder ghs[2];
 529         struct inode *inode;
 530
 531         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 532
 533         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 534         if (IS_ERR(inode)) {
 535                 gfs2_holder_uninit(ghs);
 536                 return PTR_ERR(inode);
 537         }
 538
 539         gfs2_trans_end(sdp);
 540         if (dip->i_alloc.al_rgd)
 541                 gfs2_inplace_release(dip);
 542         gfs2_quota_unlock(dip);
 543         gfs2_alloc_put(dip);
 544
 545         gfs2_glock_dq_uninit_m(2, ghs);
 546
 547         d_instantiate(dentry, inode);
 548         mark_inode_dirty(inode);
 549
 550         return 0;
 551 }
 552
 553 /**
 554  * gfs2_rename - Rename a file
 555  * @odir: Parent directory of old file name
 556  * @odentry: The old dentry of the file
 557  * @ndir: Parent directory of new file name
 558  * @ndentry: The new dentry of the file
 559  *
 560  * Returns: errno
 561  */
 562
 563 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 564                        struct inode *ndir, struct dentry *ndentry)
 565 {
 566         struct gfs2_inode *odip = GFS2_I(odir);
 567         struct gfs2_inode *ndip = GFS2_I(ndir);
 568         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 569         struct gfs2_inode *nip = NULL;
 570         struct gfs2_sbd *sdp = GFS2_SB(odir);
 571         struct gfs2_holder ghs[5], r_gh;
 572         struct gfs2_rgrpd *nrgd;
 573         unsigned int num_gh;
 574         int dir_rename = 0;
 575         int alloc_required;
 576         unsigned int x;
 577         int error;
 578
 579         if (ndentry->d_inode) {
 580                 nip = GFS2_I(ndentry->d_inode);
 581                 if (ip == nip)
 582                         return 0;
 583         }
 584
 585         /* Make sure we aren't trying to move a dirctory into it's subdir */
 586
 587         if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
 588                 dir_rename = 1;
 589
 590                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
 591                                            &r_gh);
 592                 if (error)
 593                         goto out;
 594
 595                 error = gfs2_ok_to_move(ip, ndip);
 596                 if (error)
 597                         goto out_gunlock_r;
 598         }
 599
 600         num_gh = 1;
 601         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 602         if (odip != ndip) {
 603                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 604                 num_gh++;
 605         }
 606         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 607         num_gh++;
 608
 609         if (nip) {
 610                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 611                 num_gh++;
 612                 /* grab the resource lock for unlink flag twiddling
 613                  * this is the case of the target file already existing
 614                  * so we unlink before doing the rename
 615                  */
 616                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
 617                 if (nrgd)
 618                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
 619         }
 620
 621         error = gfs2_glock_nq_m(num_gh, ghs);
 622         if (error)
 623                 goto out_uninit;
 624
 625         /* Check out the old directory */
 626
 627         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 628         if (error)
 629                 goto out_gunlock;
 630
 631         /* Check out the new directory */
 632
 633         if (nip) {
 634                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 635                 if (error)
 636                         goto out_gunlock;
 637
 638                 if (S_ISDIR(nip->i_inode.i_mode)) {
 639                         if (nip->i_di.di_entries < 2) {
 640                                 if (gfs2_consist_inode(nip))
 641                                         gfs2_dinode_print(nip);
 642                                 error = -EIO;
 643                                 goto out_gunlock;
 644                         }
 645                         if (nip->i_di.di_entries > 2) {
 646                                 error = -ENOTEMPTY;
 647                                 goto out_gunlock;
 648                         }
 649                 }
 650         } else {
 651                 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
 652                 if (error)
 653                         goto out_gunlock;
 654
 655                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
 656                 switch (error) {
 657                 case -ENOENT:
 658                         error = 0;
 659                         break;
 660                 case 0:
 661                         error = -EEXIST;
 662                 default:
 663                         goto out_gunlock;
 664                 };
 665
 666                 if (odip != ndip) {
 667                         if (!ndip->i_inode.i_nlink) {
 668                                 error = -EINVAL;
 669                                 goto out_gunlock;
 670                         }
 671                         if (ndip->i_di.di_entries == (u32)-1) {
 672                                 error = -EFBIG;
 673                                 goto out_gunlock;
 674                         }
 675                         if (S_ISDIR(ip->i_inode.i_mode) &&
 676                             ndip->i_inode.i_nlink == (u32)-1) {
 677                                 error = -EMLINK;
 678                                 goto out_gunlock;
 679                         }
 680                 }
 681         }
 682
 683         /* Check out the dir to be renamed */
 684
 685         if (dir_rename) {
 686                 error = permission(odentry->d_inode, MAY_WRITE, NULL);
 687                 if (error)
 688                         goto out_gunlock;
 689         }
 690
 691         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 692         if (error < 0)
 693                 goto out_gunlock;
 694         error = 0;
 695
 696         if (alloc_required) {
 697                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 698
 699                 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 700                 if (error)
 701                         goto out_alloc;
 702
 703                 error = gfs2_quota_check(ndip, ndip->i_inode.i_uid, ndip->i_inode.i_gid);
 704                 if (error)
 705                         goto out_gunlock_q;
 706
 707                 al->al_requested = sdp->sd_max_dirres;
 708
 709                 error = gfs2_inplace_reserve(ndip);
 710                 if (error)
 711                         goto out_gunlock_q;
 712
 713                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 714                                          al->al_rgd->rd_length +
 715                                          4 * RES_DINODE + 4 * RES_LEAF +
 716                                          RES_STATFS + RES_QUOTA + 4, 0);
 717                 if (error)
 718                         goto out_ipreserv;
 719         } else {
 720                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 721                                          5 * RES_LEAF + 4, 0);
 722                 if (error)
 723                         goto out_gunlock;
 724         }
 725
 726         /* Remove the target file, if it exists */
 727
 728         if (nip) {
 729                 if (S_ISDIR(nip->i_inode.i_mode))
 730                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 731                 else {
 732                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 733                         if (error)
 734                                 goto out_end_trans;
 735                         error = gfs2_change_nlink(nip, -1);
 736                 }
 737                 if (error)
 738                         goto out_end_trans;
 739         }
 740
 741         if (dir_rename) {
 742                 struct qstr name;
 743                 gfs2_str2qstr(&name, "..");
 744
 745                 error = gfs2_change_nlink(ndip, +1);
 746                 if (error)
 747                         goto out_end_trans;
 748                 error = gfs2_change_nlink(odip, -1);
 749                 if (error)
 750                         goto out_end_trans;
 751
 752                 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
 753                 if (error)
 754                         goto out_end_trans;
 755         } else {
 756                 struct buffer_head *dibh;
 757                 error = gfs2_meta_inode_buffer(ip, &dibh);
 758                 if (error)
 759                         goto out_end_trans;
 760                 ip->i_inode.i_ctime = CURRENT_TIME;
 761                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 762                 gfs2_dinode_out(ip, dibh->b_data);
 763                 brelse(dibh);
 764         }
 765
 766         error = gfs2_dir_del(odip, &odentry->d_name);
 767         if (error)
 768                 goto out_end_trans;
 769
 770         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
 771         if (error)
 772                 goto out_end_trans;
 773
 774 out_end_trans:
 775         gfs2_trans_end(sdp);
 776 out_ipreserv:
 777         if (alloc_required)
 778                 gfs2_inplace_release(ndip);
 779 out_gunlock_q:
 780         if (alloc_required)
 781                 gfs2_quota_unlock(ndip);
 782 out_alloc:
 783         if (alloc_required)
 784                 gfs2_alloc_put(ndip);
 785 out_gunlock:
 786         gfs2_glock_dq_m(num_gh, ghs);
 787 out_uninit:
 788         for (x = 0; x < num_gh; x++)
 789                 gfs2_holder_uninit(ghs + x);
 790 out_gunlock_r:
 791         if (dir_rename)
 792                 gfs2_glock_dq_uninit(&r_gh);
 793 out:
 794         return error;
 795 }
 796
 797 /**
 798  * gfs2_readlink - Read the value of a symlink
 799  * @dentry: the symlink
 800  * @buf: the buffer to read the symlink data into
 801  * @size: the size of the buffer
 802  *
 803  * Returns: errno
 804  */
 805
 806 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 807                          int user_size)
 808 {
 809         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 810         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 811         unsigned int len = GFS2_FAST_NAME_SIZE;
 812         int error;
 813
 814         error = gfs2_readlinki(ip, &buf, &len);
 815         if (error)
 816                 return error;
 817
 818         if (user_size > len - 1)
 819                 user_size = len - 1;
 820
 821         if (copy_to_user(user_buf, buf, user_size))
 822                 error = -EFAULT;
 823         else
 824                 error = user_size;
 825
 826         if (buf != array)
 827                 kfree(buf);
 828
 829         return error;
 830 }
 831
 832 /**
 833  * gfs2_follow_link - Follow a symbolic link
 834  * @dentry: The dentry of the link
 835  * @nd: Data that we pass to vfs_follow_link()
 836  *
 837  * This can handle symlinks of any size. It is optimised for symlinks
 838  * under GFS2_FAST_NAME_SIZE.
 839  *
 840  * Returns: 0 on success or error code
 841  */
 842
 843 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 844 {
 845         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 846         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 847         unsigned int len = GFS2_FAST_NAME_SIZE;
 848         int error;
 849
 850         error = gfs2_readlinki(ip, &buf, &len);
 851         if (!error) {
 852                 error = vfs_follow_link(nd, buf);
 853                 if (buf != array)
 854                         kfree(buf);
 855         }
 856
 857         return ERR_PTR(error);
 858 }
 859
 860 /**
 861  * gfs2_permission -
 862  * @inode:
 863  * @mask:
 864  * @nd: passed from Linux VFS, ignored by us
 865  *
 866  * This may be called from the VFS directly, or from within GFS2 with the
 867  * inode locked, so we look to see if the glock is already locked and only
 868  * lock the glock if its not already been done.
 869  *
 870  * Returns: errno
 871  */
 872
 873 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
 874 {
 875         struct gfs2_inode *ip = GFS2_I(inode);
 876         struct gfs2_holder i_gh;
 877         int error;
 878         int unlock = 0;
 879
 880         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
 881                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 882                 if (error)
 883                         return error;
 884                 unlock = 1;
 885         }
 886
 887         error = generic_permission(inode, mask, gfs2_check_acl);
 888         if (unlock)
 889                 gfs2_glock_dq_uninit(&i_gh);
 890
 891         return error;
 892 }
 893
 894 static int setattr_size(struct inode *inode, struct iattr *attr)
 895 {
 896         struct gfs2_inode *ip = GFS2_I(inode);
 897         int error;
 898
 899         if (attr->ia_size != ip->i_di.di_size) {
 900                 error = vmtruncate(inode, attr->ia_size);
 901                 if (error)
 902                         return error;
 903         }
 904
 905         error = gfs2_truncatei(ip, attr->ia_size);
 906         if (error && (inode->i_size != ip->i_di.di_size))
 907                 i_size_write(inode, ip->i_di.di_size);
 908
 909         return error;
 910 }
 911
 912 static int setattr_chown(struct inode *inode, struct iattr *attr)
 913 {
 914         struct gfs2_inode *ip = GFS2_I(inode);
 915         struct gfs2_sbd *sdp = GFS2_SB(inode);
 916         struct buffer_head *dibh;
 917         u32 ouid, ogid, nuid, ngid;
 918         int error;
 919
 920         ouid = inode->i_uid;
 921         ogid = inode->i_gid;
 922         nuid = attr->ia_uid;
 923         ngid = attr->ia_gid;
 924
 925         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
 926                 ouid = nuid = NO_QUOTA_CHANGE;
 927         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
 928                 ogid = ngid = NO_QUOTA_CHANGE;
 929
 930         gfs2_alloc_get(ip);
 931
 932         error = gfs2_quota_lock(ip, nuid, ngid);
 933         if (error)
 934                 goto out_alloc;
 935
 936         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 937                 error = gfs2_quota_check(ip, nuid, ngid);
 938                 if (error)
 939                         goto out_gunlock_q;
 940         }
 941
 942         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
 943         if (error)
 944                 goto out_gunlock_q;
 945
 946         error = gfs2_meta_inode_buffer(ip, &dibh);
 947         if (error)
 948                 goto out_end_trans;
 949
 950         error = inode_setattr(inode, attr);
 951         gfs2_assert_warn(sdp, !error);
 952
 953         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 954         gfs2_dinode_out(ip, dibh->b_data);
 955         brelse(dibh);
 956
 957         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 958                 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
 959                 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
 960         }
 961
 962 out_end_trans:
 963         gfs2_trans_end(sdp);
 964 out_gunlock_q:
 965         gfs2_quota_unlock(ip);
 966 out_alloc:
 967         gfs2_alloc_put(ip);
 968         return error;
 969 }
 970
 971 /**
 972  * gfs2_setattr - Change attributes on an inode
 973  * @dentry: The dentry which is changing
 974  * @attr: The structure describing the change
 975  *
 976  * The VFS layer wants to change one or more of an inodes attributes.  Write
 977  * that change out to disk.
 978  *
 979  * Returns: errno
 980  */
 981
 982 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
 983 {
 984         struct inode *inode = dentry->d_inode;
 985         struct gfs2_inode *ip = GFS2_I(inode);
 986         struct gfs2_holder i_gh;
 987         int error;
 988
 989         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
 990         if (error)
 991                 return error;
 992
 993         error = -EPERM;
 994         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 995                 goto out;
 996
 997         error = inode_change_ok(inode, attr);
 998         if (error)
 999                 goto out;
1000
1001         if (attr->ia_valid & ATTR_SIZE)
1002                 error = setattr_size(inode, attr);
1003         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1004                 error = setattr_chown(inode, attr);
1005         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1006                 error = gfs2_acl_chmod(ip, attr);
1007         else
1008                 error = gfs2_setattr_simple(ip, attr);
1009
1010 out:
1011         gfs2_glock_dq_uninit(&i_gh);
1012         if (!error)
1013                 mark_inode_dirty(inode);
1014         return error;
1015 }
1016
1017 /**
1018  * gfs2_getattr - Read out an inode's attributes
1019  * @mnt: The vfsmount the inode is being accessed from
1020  * @dentry: The dentry to stat
1021  * @stat: The inode's stats
1022  *
1023  * This may be called from the VFS directly, or from within GFS2 with the
1024  * inode locked, so we look to see if the glock is already locked and only
1025  * lock the glock if its not already been done. Note that its the NFS
1026  * readdirplus operation which causes this to be called (from filldir)
1027  * with the glock already held.
1028  *
1029  * Returns: errno
1030  */
1031
1032 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1033                         struct kstat *stat)
1034 {
1035         struct inode *inode = dentry->d_inode;
1036         struct gfs2_inode *ip = GFS2_I(inode);
1037         struct gfs2_holder gh;
1038         int error;
1039         int unlock = 0;
1040
1041         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
1042                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1043                 if (error)
1044                         return error;
1045                 unlock = 1;
1046         }
1047
1048         generic_fillattr(inode, stat);
1049         if (unlock)
1050                 gfs2_glock_dq_uninit(&gh);
1051
1052         return 0;
1053 }
1054
1055 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1056                          const void *data, size_t size, int flags)
1057 {
1058         struct inode *inode = dentry->d_inode;
1059         struct gfs2_ea_request er;
1060
1061         memset(&er, 0, sizeof(struct gfs2_ea_request));
1062         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1063         if (er.er_type == GFS2_EATYPE_UNUSED)
1064                 return -EOPNOTSUPP;
1065         er.er_data = (char *)data;
1066         er.er_name_len = strlen(er.er_name);
1067         er.er_data_len = size;
1068         er.er_flags = flags;
1069
1070         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1071
1072         return gfs2_ea_set(GFS2_I(inode), &er);
1073 }
1074
1075 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1076                              void *data, size_t size)
1077 {
1078         struct gfs2_ea_request er;
1079
1080         memset(&er, 0, sizeof(struct gfs2_ea_request));
1081         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1082         if (er.er_type == GFS2_EATYPE_UNUSED)
1083                 return -EOPNOTSUPP;
1084         er.er_data = data;
1085         er.er_name_len = strlen(er.er_name);
1086         er.er_data_len = size;
1087
1088         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1089 }
1090
1091 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1092 {
1093         struct gfs2_ea_request er;
1094
1095         memset(&er, 0, sizeof(struct gfs2_ea_request));
1096         er.er_data = (size) ? buffer : NULL;
1097         er.er_data_len = size;
1098
1099         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1100 }
1101
1102 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1103 {
1104         struct gfs2_ea_request er;
1105
1106         memset(&er, 0, sizeof(struct gfs2_ea_request));
1107         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1108         if (er.er_type == GFS2_EATYPE_UNUSED)
1109                 return -EOPNOTSUPP;
1110         er.er_name_len = strlen(er.er_name);
1111
1112         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1113 }
1114
1115 const struct inode_operations gfs2_file_iops = {
1116         .permission = gfs2_permission,
1117         .setattr = gfs2_setattr,
1118         .getattr = gfs2_getattr,
1119         .setxattr = gfs2_setxattr,
1120         .getxattr = gfs2_getxattr,
1121         .listxattr = gfs2_listxattr,
1122         .removexattr = gfs2_removexattr,
1123 };
1124
1125 const struct inode_operations gfs2_dev_iops = {
1126         .permission = gfs2_permission,
1127         .setattr = gfs2_setattr,
1128         .getattr = gfs2_getattr,
1129         .setxattr = gfs2_setxattr,
1130         .getxattr = gfs2_getxattr,
1131         .listxattr = gfs2_listxattr,
1132         .removexattr = gfs2_removexattr,
1133 };
1134
1135 const struct inode_operations gfs2_dir_iops = {
1136         .create = gfs2_create,
1137         .lookup = gfs2_lookup,
1138         .link = gfs2_link,
1139         .unlink = gfs2_unlink,
1140         .symlink = gfs2_symlink,
1141         .mkdir = gfs2_mkdir,
1142         .rmdir = gfs2_rmdir,
1143         .mknod = gfs2_mknod,
1144         .rename = gfs2_rename,
1145         .permission = gfs2_permission,
1146         .setattr = gfs2_setattr,
1147         .getattr = gfs2_getattr,
1148         .setxattr = gfs2_setxattr,
1149         .getxattr = gfs2_getxattr,
1150         .listxattr = gfs2_listxattr,
1151         .removexattr = gfs2_removexattr,
1152 };
1153
1154 const struct inode_operations gfs2_symlink_iops = {
1155         .readlink = gfs2_readlink,
1156         .follow_link = gfs2_follow_link,
1157         .permission = gfs2_permission,
1158         .setattr = gfs2_setattr,
1159         .getattr = gfs2_getattr,
1160         .setxattr = gfs2_setxattr,
1161         .getxattr = gfs2_getxattr,
1162         .listxattr = gfs2_listxattr,
1163         .removexattr = gfs2_removexattr,
1164 };
1165