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_CAST(inode);
 115
 116         if (inode) {
 117                 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
 118                 struct gfs2_holder gh;
 119                 int error;
 120                 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 121                 if (error) {
 122                         iput(inode);
 123                         return ERR_PTR(error);
 124                 }
 125                 gfs2_glock_dq_uninit(&gh);
 126                 return d_splice_alias(inode, dentry);
 127         }
 128         d_add(dentry, inode);
 129
 130         return NULL;
 131 }
 132
 133 /**
 134  * gfs2_link - Link to a file
 135  * @old_dentry: The inode to link
 136  * @dir: Add link to this directory
 137  * @dentry: The name of the link
 138  *
 139  * Link the inode in "old_dentry" into the directory "dir" with the
 140  * name in "dentry".
 141  *
 142  * Returns: errno
 143  */
 144
 145 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 146                      struct dentry *dentry)
 147 {
 148         struct gfs2_inode *dip = GFS2_I(dir);
 149         struct gfs2_sbd *sdp = GFS2_SB(dir);
 150         struct inode *inode = old_dentry->d_inode;
 151         struct gfs2_inode *ip = GFS2_I(inode);
 152         struct gfs2_holder ghs[2];
 153         int alloc_required;
 154         int error;
 155
 156         if (S_ISDIR(inode->i_mode))
 157                 return -EPERM;
 158
 159         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 160         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 161
 162         error = gfs2_glock_nq_m(2, ghs);
 163         if (error)
 164                 goto out;
 165
 166         error = permission(dir, MAY_WRITE | MAY_EXEC, NULL);
 167         if (error)
 168                 goto out_gunlock;
 169
 170         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 171         switch (error) {
 172         case -ENOENT:
 173                 break;
 174         case 0:
 175                 error = -EEXIST;
 176         default:
 177                 goto out_gunlock;
 178         }
 179
 180         error = -EINVAL;
 181         if (!dip->i_inode.i_nlink)
 182                 goto out_gunlock;
 183         error = -EFBIG;
 184         if (dip->i_di.di_entries == (u32)-1)
 185                 goto out_gunlock;
 186         error = -EPERM;
 187         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 188                 goto out_gunlock;
 189         error = -EINVAL;
 190         if (!ip->i_inode.i_nlink)
 191                 goto out_gunlock;
 192         error = -EMLINK;
 193         if (ip->i_inode.i_nlink == (u32)-1)
 194                 goto out_gunlock;
 195
 196         alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
 197         if (error < 0)
 198                 goto out_gunlock;
 199         error = 0;
 200
 201         if (alloc_required) {
 202                 struct gfs2_alloc *al = gfs2_alloc_get(dip);
 203                 if (!al) {
 204                         error = -ENOMEM;
 205                         goto out_gunlock;
 206                 }
 207
 208                 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 209                 if (error)
 210                         goto out_alloc;
 211
 212                 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
 213                 if (error)
 214                         goto out_gunlock_q;
 215
 216                 al->al_requested = sdp->sd_max_dirres;
 217
 218                 error = gfs2_inplace_reserve(dip);
 219                 if (error)
 220                         goto out_gunlock_q;
 221
 222                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 223                                          al->al_rgd->rd_length +
 224                                          2 * RES_DINODE + RES_STATFS +
 225                                          RES_QUOTA, 0);
 226                 if (error)
 227                         goto out_ipres;
 228         } else {
 229                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 230                 if (error)
 231                         goto out_ipres;
 232         }
 233
 234         error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
 235         if (error)
 236                 goto out_end_trans;
 237
 238         error = gfs2_change_nlink(ip, +1);
 239
 240 out_end_trans:
 241         gfs2_trans_end(sdp);
 242 out_ipres:
 243         if (alloc_required)
 244                 gfs2_inplace_release(dip);
 245 out_gunlock_q:
 246         if (alloc_required)
 247                 gfs2_quota_unlock(dip);
 248 out_alloc:
 249         if (alloc_required)
 250                 gfs2_alloc_put(dip);
 251 out_gunlock:
 252         gfs2_glock_dq_m(2, ghs);
 253 out:
 254         gfs2_holder_uninit(ghs);
 255         gfs2_holder_uninit(ghs + 1);
 256         if (!error) {
 257                 atomic_inc(&inode->i_count);
 258                 d_instantiate(dentry, inode);
 259                 mark_inode_dirty(inode);
 260         }
 261         return error;
 262 }
 263
 264 /**
 265  * gfs2_unlink - Unlink a file
 266  * @dir: The inode of the directory containing the file to unlink
 267  * @dentry: The file itself
 268  *
 269  * Unlink a file.  Call gfs2_unlinki()
 270  *
 271  * Returns: errno
 272  */
 273
 274 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 275 {
 276         struct gfs2_inode *dip = GFS2_I(dir);
 277         struct gfs2_sbd *sdp = GFS2_SB(dir);
 278         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 279         struct gfs2_holder ghs[3];
 280         struct gfs2_rgrpd *rgd;
 281         struct gfs2_holder ri_gh;
 282         int error;
 283
 284         error = gfs2_rindex_hold(sdp, &ri_gh);
 285         if (error)
 286                 return error;
 287
 288         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 289         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
 290
 291         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 292         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 293
 294
 295         error = gfs2_glock_nq(ghs); /* parent */
 296         if (error)
 297                 goto out_parent;
 298
 299         error = gfs2_glock_nq(ghs + 1); /* child */
 300         if (error)
 301                 goto out_child;
 302
 303         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 304         if (error)
 305                 goto out_rgrp;
 306
 307         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 308         if (error)
 309                 goto out_rgrp;
 310
 311         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 312         if (error)
 313                 goto out_rgrp;
 314
 315         error = gfs2_dir_del(dip, &dentry->d_name);
 316         if (error)
 317                 goto out_end_trans;
 318
 319         error = gfs2_change_nlink(ip, -1);
 320
 321 out_end_trans:
 322         gfs2_trans_end(sdp);
 323         gfs2_glock_dq(ghs + 2);
 324 out_rgrp:
 325         gfs2_holder_uninit(ghs + 2);
 326         gfs2_glock_dq(ghs + 1);
 327 out_child:
 328         gfs2_holder_uninit(ghs + 1);
 329         gfs2_glock_dq(ghs);
 330 out_parent:
 331         gfs2_holder_uninit(ghs);
 332         gfs2_glock_dq_uninit(&ri_gh);
 333         return error;
 334 }
 335
 336 /**
 337  * gfs2_symlink - Create a symlink
 338  * @dir: The directory to create the symlink in
 339  * @dentry: The dentry to put the symlink in
 340  * @symname: The thing which the link points to
 341  *
 342  * Returns: errno
 343  */
 344
 345 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 346                         const char *symname)
 347 {
 348         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 349         struct gfs2_sbd *sdp = GFS2_SB(dir);
 350         struct gfs2_holder ghs[2];
 351         struct inode *inode;
 352         struct buffer_head *dibh;
 353         int size;
 354         int error;
 355
 356         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 357         size = strlen(symname);
 358         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 359                 return -ENAMETOOLONG;
 360
 361         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 362
 363         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 364         if (IS_ERR(inode)) {
 365                 gfs2_holder_uninit(ghs);
 366                 return PTR_ERR(inode);
 367         }
 368
 369         ip = ghs[1].gh_gl->gl_object;
 370
 371         ip->i_di.di_size = size;
 372
 373         error = gfs2_meta_inode_buffer(ip, &dibh);
 374
 375         if (!gfs2_assert_withdraw(sdp, !error)) {
 376                 gfs2_dinode_out(ip, dibh->b_data);
 377                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 378                        size);
 379                 brelse(dibh);
 380         }
 381
 382         gfs2_trans_end(sdp);
 383         if (dip->i_alloc->al_rgd)
 384                 gfs2_inplace_release(dip);
 385         gfs2_quota_unlock(dip);
 386         gfs2_alloc_put(dip);
 387
 388         gfs2_glock_dq_uninit_m(2, ghs);
 389
 390         d_instantiate(dentry, inode);
 391         mark_inode_dirty(inode);
 392
 393         return 0;
 394 }
 395
 396 /**
 397  * gfs2_mkdir - Make a directory
 398  * @dir: The parent directory of the new one
 399  * @dentry: The dentry of the new directory
 400  * @mode: The mode of the new directory
 401  *
 402  * Returns: errno
 403  */
 404
 405 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 406 {
 407         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 408         struct gfs2_sbd *sdp = GFS2_SB(dir);
 409         struct gfs2_holder ghs[2];
 410         struct inode *inode;
 411         struct buffer_head *dibh;
 412         int error;
 413
 414         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 415
 416         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 417         if (IS_ERR(inode)) {
 418                 gfs2_holder_uninit(ghs);
 419                 return PTR_ERR(inode);
 420         }
 421
 422         ip = ghs[1].gh_gl->gl_object;
 423
 424         ip->i_inode.i_nlink = 2;
 425         ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 426         ip->i_di.di_flags |= GFS2_DIF_JDATA;
 427         ip->i_di.di_entries = 2;
 428
 429         error = gfs2_meta_inode_buffer(ip, &dibh);
 430
 431         if (!gfs2_assert_withdraw(sdp, !error)) {
 432                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 433                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 434                 struct qstr str;
 435
 436                 gfs2_str2qstr(&str, ".");
 437                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 438                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 439                 dent->de_inum = di->di_num; /* already GFS2 endian */
 440                 dent->de_type = cpu_to_be16(DT_DIR);
 441                 di->di_entries = cpu_to_be32(1);
 442
 443                 gfs2_str2qstr(&str, "..");
 444                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 445                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 446
 447                 gfs2_inum_out(dip, dent);
 448                 dent->de_type = cpu_to_be16(DT_DIR);
 449
 450                 gfs2_dinode_out(ip, di);
 451
 452                 brelse(dibh);
 453         }
 454
 455         error = gfs2_change_nlink(dip, +1);
 456         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 457
 458         gfs2_trans_end(sdp);
 459         if (dip->i_alloc->al_rgd)
 460                 gfs2_inplace_release(dip);
 461         gfs2_quota_unlock(dip);
 462         gfs2_alloc_put(dip);
 463
 464         gfs2_glock_dq_uninit_m(2, ghs);
 465
 466         d_instantiate(dentry, inode);
 467         mark_inode_dirty(inode);
 468
 469         return 0;
 470 }
 471
 472 /**
 473  * gfs2_rmdir - Remove a directory
 474  * @dir: The parent directory of the directory to be removed
 475  * @dentry: The dentry of the directory to remove
 476  *
 477  * Remove a directory. Call gfs2_rmdiri()
 478  *
 479  * Returns: errno
 480  */
 481
 482 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 483 {
 484         struct gfs2_inode *dip = GFS2_I(dir);
 485         struct gfs2_sbd *sdp = GFS2_SB(dir);
 486         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 487         struct gfs2_holder ghs[3];
 488         struct gfs2_rgrpd *rgd;
 489         struct gfs2_holder ri_gh;
 490         int error;
 491
 492
 493         error = gfs2_rindex_hold(sdp, &ri_gh);
 494         if (error)
 495                 return error;
 496         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 497         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 498
 499         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 500         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 501
 502         error = gfs2_glock_nq_m(3, ghs);
 503         if (error)
 504                 goto out;
 505
 506         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 507         if (error)
 508                 goto out_gunlock;
 509
 510         if (ip->i_di.di_entries < 2) {
 511                 if (gfs2_consist_inode(ip))
 512                         gfs2_dinode_print(ip);
 513                 error = -EIO;
 514                 goto out_gunlock;
 515         }
 516         if (ip->i_di.di_entries > 2) {
 517                 error = -ENOTEMPTY;
 518                 goto out_gunlock;
 519         }
 520
 521         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 522         if (error)
 523                 goto out_gunlock;
 524
 525         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 526
 527         gfs2_trans_end(sdp);
 528
 529 out_gunlock:
 530         gfs2_glock_dq_m(3, ghs);
 531 out:
 532         gfs2_holder_uninit(ghs);
 533         gfs2_holder_uninit(ghs + 1);
 534         gfs2_holder_uninit(ghs + 2);
 535         gfs2_glock_dq_uninit(&ri_gh);
 536         return error;
 537 }
 538
 539 /**
 540  * gfs2_mknod - Make a special file
 541  * @dir: The directory in which the special file will reside
 542  * @dentry: The dentry of the special file
 543  * @mode: The mode of the special file
 544  * @rdev: The device specification of the special file
 545  *
 546  */
 547
 548 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 549                       dev_t dev)
 550 {
 551         struct gfs2_inode *dip = GFS2_I(dir);
 552         struct gfs2_sbd *sdp = GFS2_SB(dir);
 553         struct gfs2_holder ghs[2];
 554         struct inode *inode;
 555
 556         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 557
 558         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 559         if (IS_ERR(inode)) {
 560                 gfs2_holder_uninit(ghs);
 561                 return PTR_ERR(inode);
 562         }
 563
 564         gfs2_trans_end(sdp);
 565         if (dip->i_alloc->al_rgd)
 566                 gfs2_inplace_release(dip);
 567         gfs2_quota_unlock(dip);
 568         gfs2_alloc_put(dip);
 569
 570         gfs2_glock_dq_uninit_m(2, ghs);
 571
 572         d_instantiate(dentry, inode);
 573         mark_inode_dirty(inode);
 574
 575         return 0;
 576 }
 577
 578 /**
 579  * gfs2_rename - Rename a file
 580  * @odir: Parent directory of old file name
 581  * @odentry: The old dentry of the file
 582  * @ndir: Parent directory of new file name
 583  * @ndentry: The new dentry of the file
 584  *
 585  * Returns: errno
 586  */
 587
 588 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 589                        struct inode *ndir, struct dentry *ndentry)
 590 {
 591         struct gfs2_inode *odip = GFS2_I(odir);
 592         struct gfs2_inode *ndip = GFS2_I(ndir);
 593         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 594         struct gfs2_inode *nip = NULL;
 595         struct gfs2_sbd *sdp = GFS2_SB(odir);
 596         struct gfs2_holder ghs[5], r_gh;
 597         struct gfs2_rgrpd *nrgd;
 598         unsigned int num_gh;
 599         int dir_rename = 0;
 600         int alloc_required;
 601         unsigned int x;
 602         int error;
 603
 604         if (ndentry->d_inode) {
 605                 nip = GFS2_I(ndentry->d_inode);
 606                 if (ip == nip)
 607                         return 0;
 608         }
 609
 610         /* Make sure we aren't trying to move a dirctory into it's subdir */
 611
 612         if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
 613                 dir_rename = 1;
 614
 615                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
 616                                            &r_gh);
 617                 if (error)
 618                         goto out;
 619
 620                 error = gfs2_ok_to_move(ip, ndip);
 621                 if (error)
 622                         goto out_gunlock_r;
 623         }
 624
 625         num_gh = 1;
 626         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 627         if (odip != ndip) {
 628                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 629                 num_gh++;
 630         }
 631         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 632         num_gh++;
 633
 634         if (nip) {
 635                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 636                 num_gh++;
 637                 /* grab the resource lock for unlink flag twiddling
 638                  * this is the case of the target file already existing
 639                  * so we unlink before doing the rename
 640                  */
 641                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
 642                 if (nrgd)
 643                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
 644         }
 645
 646         error = gfs2_glock_nq_m(num_gh, ghs);
 647         if (error)
 648                 goto out_uninit;
 649
 650         /* Check out the old directory */
 651
 652         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 653         if (error)
 654                 goto out_gunlock;
 655
 656         /* Check out the new directory */
 657
 658         if (nip) {
 659                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 660                 if (error)
 661                         goto out_gunlock;
 662
 663                 if (S_ISDIR(nip->i_inode.i_mode)) {
 664                         if (nip->i_di.di_entries < 2) {
 665                                 if (gfs2_consist_inode(nip))
 666                                         gfs2_dinode_print(nip);
 667                                 error = -EIO;
 668                                 goto out_gunlock;
 669                         }
 670                         if (nip->i_di.di_entries > 2) {
 671                                 error = -ENOTEMPTY;
 672                                 goto out_gunlock;
 673                         }
 674                 }
 675         } else {
 676                 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
 677                 if (error)
 678                         goto out_gunlock;
 679
 680                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
 681                 switch (error) {
 682                 case -ENOENT:
 683                         error = 0;
 684                         break;
 685                 case 0:
 686                         error = -EEXIST;
 687                 default:
 688                         goto out_gunlock;
 689                 };
 690
 691                 if (odip != ndip) {
 692                         if (!ndip->i_inode.i_nlink) {
 693                                 error = -EINVAL;
 694                                 goto out_gunlock;
 695                         }
 696                         if (ndip->i_di.di_entries == (u32)-1) {
 697                                 error = -EFBIG;
 698                                 goto out_gunlock;
 699                         }
 700                         if (S_ISDIR(ip->i_inode.i_mode) &&
 701                             ndip->i_inode.i_nlink == (u32)-1) {
 702                                 error = -EMLINK;
 703                                 goto out_gunlock;
 704                         }
 705                 }
 706         }
 707
 708         /* Check out the dir to be renamed */
 709
 710         if (dir_rename) {
 711                 error = permission(odentry->d_inode, MAY_WRITE, NULL);
 712                 if (error)
 713                         goto out_gunlock;
 714         }
 715
 716         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 717         if (error < 0)
 718                 goto out_gunlock;
 719         error = 0;
 720
 721         if (alloc_required) {
 722                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 723                 if (!al) {
 724                         error = -ENOMEM;
 725                         goto out_gunlock;
 726                 }
 727
 728                 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 729                 if (error)
 730                         goto out_alloc;
 731
 732                 error = gfs2_quota_check(ndip, ndip->i_inode.i_uid, ndip->i_inode.i_gid);
 733                 if (error)
 734                         goto out_gunlock_q;
 735
 736                 al->al_requested = sdp->sd_max_dirres;
 737
 738                 error = gfs2_inplace_reserve(ndip);
 739                 if (error)
 740                         goto out_gunlock_q;
 741
 742                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 743                                          al->al_rgd->rd_length +
 744                                          4 * RES_DINODE + 4 * RES_LEAF +
 745                                          RES_STATFS + RES_QUOTA + 4, 0);
 746                 if (error)
 747                         goto out_ipreserv;
 748         } else {
 749                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 750                                          5 * RES_LEAF + 4, 0);
 751                 if (error)
 752                         goto out_gunlock;
 753         }
 754
 755         /* Remove the target file, if it exists */
 756
 757         if (nip) {
 758                 if (S_ISDIR(nip->i_inode.i_mode))
 759                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 760                 else {
 761                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 762                         if (error)
 763                                 goto out_end_trans;
 764                         error = gfs2_change_nlink(nip, -1);
 765                 }
 766                 if (error)
 767                         goto out_end_trans;
 768         }
 769
 770         if (dir_rename) {
 771                 struct qstr name;
 772                 gfs2_str2qstr(&name, "..");
 773
 774                 error = gfs2_change_nlink(ndip, +1);
 775                 if (error)
 776                         goto out_end_trans;
 777                 error = gfs2_change_nlink(odip, -1);
 778                 if (error)
 779                         goto out_end_trans;
 780
 781                 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
 782                 if (error)
 783                         goto out_end_trans;
 784         } else {
 785                 struct buffer_head *dibh;
 786                 error = gfs2_meta_inode_buffer(ip, &dibh);
 787                 if (error)
 788                         goto out_end_trans;
 789                 ip->i_inode.i_ctime = CURRENT_TIME;
 790                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 791                 gfs2_dinode_out(ip, dibh->b_data);
 792                 brelse(dibh);
 793         }
 794
 795         error = gfs2_dir_del(odip, &odentry->d_name);
 796         if (error)
 797                 goto out_end_trans;
 798
 799         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
 800         if (error)
 801                 goto out_end_trans;
 802
 803 out_end_trans:
 804         gfs2_trans_end(sdp);
 805 out_ipreserv:
 806         if (alloc_required)
 807                 gfs2_inplace_release(ndip);
 808 out_gunlock_q:
 809         if (alloc_required)
 810                 gfs2_quota_unlock(ndip);
 811 out_alloc:
 812         if (alloc_required)
 813                 gfs2_alloc_put(ndip);
 814 out_gunlock:
 815         gfs2_glock_dq_m(num_gh, ghs);
 816 out_uninit:
 817         for (x = 0; x < num_gh; x++)
 818                 gfs2_holder_uninit(ghs + x);
 819 out_gunlock_r:
 820         if (dir_rename)
 821                 gfs2_glock_dq_uninit(&r_gh);
 822 out:
 823         return error;
 824 }
 825
 826 /**
 827  * gfs2_readlink - Read the value of a symlink
 828  * @dentry: the symlink
 829  * @buf: the buffer to read the symlink data into
 830  * @size: the size of the buffer
 831  *
 832  * Returns: errno
 833  */
 834
 835 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 836                          int user_size)
 837 {
 838         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 839         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 840         unsigned int len = GFS2_FAST_NAME_SIZE;
 841         int error;
 842
 843         error = gfs2_readlinki(ip, &buf, &len);
 844         if (error)
 845                 return error;
 846
 847         if (user_size > len - 1)
 848                 user_size = len - 1;
 849
 850         if (copy_to_user(user_buf, buf, user_size))
 851                 error = -EFAULT;
 852         else
 853                 error = user_size;
 854
 855         if (buf != array)
 856                 kfree(buf);
 857
 858         return error;
 859 }
 860
 861 /**
 862  * gfs2_follow_link - Follow a symbolic link
 863  * @dentry: The dentry of the link
 864  * @nd: Data that we pass to vfs_follow_link()
 865  *
 866  * This can handle symlinks of any size. It is optimised for symlinks
 867  * under GFS2_FAST_NAME_SIZE.
 868  *
 869  * Returns: 0 on success or error code
 870  */
 871
 872 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 873 {
 874         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 875         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 876         unsigned int len = GFS2_FAST_NAME_SIZE;
 877         int error;
 878
 879         error = gfs2_readlinki(ip, &buf, &len);
 880         if (!error) {
 881                 error = vfs_follow_link(nd, buf);
 882                 if (buf != array)
 883                         kfree(buf);
 884         }
 885
 886         return ERR_PTR(error);
 887 }
 888
 889 /**
 890  * gfs2_permission -
 891  * @inode:
 892  * @mask:
 893  * @nd: passed from Linux VFS, ignored by us
 894  *
 895  * This may be called from the VFS directly, or from within GFS2 with the
 896  * inode locked, so we look to see if the glock is already locked and only
 897  * lock the glock if its not already been done.
 898  *
 899  * Returns: errno
 900  */
 901
 902 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
 903 {
 904         struct gfs2_inode *ip = GFS2_I(inode);
 905         struct gfs2_holder i_gh;
 906         int error;
 907         int unlock = 0;
 908
 909         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
 910                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 911                 if (error)
 912                         return error;
 913                 unlock = 1;
 914         }
 915
 916         error = generic_permission(inode, mask, gfs2_check_acl);
 917         if (unlock)
 918                 gfs2_glock_dq_uninit(&i_gh);
 919
 920         return error;
 921 }
 922
 923 static int setattr_size(struct inode *inode, struct iattr *attr)
 924 {
 925         struct gfs2_inode *ip = GFS2_I(inode);
 926         struct gfs2_sbd *sdp = GFS2_SB(inode);
 927         int error;
 928
 929         if (attr->ia_size != ip->i_di.di_size) {
 930                 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
 931                 if (error)
 932                         return error;
 933                 error = vmtruncate(inode, attr->ia_size);
 934                 gfs2_trans_end(sdp);
 935                 if (error)
 936                         return error;
 937         }
 938
 939         error = gfs2_truncatei(ip, attr->ia_size);
 940         if (error && (inode->i_size != ip->i_di.di_size))
 941                 i_size_write(inode, ip->i_di.di_size);
 942
 943         return error;
 944 }
 945
 946 static int setattr_chown(struct inode *inode, struct iattr *attr)
 947 {
 948         struct gfs2_inode *ip = GFS2_I(inode);
 949         struct gfs2_sbd *sdp = GFS2_SB(inode);
 950         struct buffer_head *dibh;
 951         u32 ouid, ogid, nuid, ngid;
 952         int error;
 953
 954         ouid = inode->i_uid;
 955         ogid = inode->i_gid;
 956         nuid = attr->ia_uid;
 957         ngid = attr->ia_gid;
 958
 959         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
 960                 ouid = nuid = NO_QUOTA_CHANGE;
 961         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
 962                 ogid = ngid = NO_QUOTA_CHANGE;
 963
 964         if (!gfs2_alloc_get(ip))
 965                 return -ENOMEM;
 966
 967         error = gfs2_quota_lock(ip, nuid, ngid);
 968         if (error)
 969                 goto out_alloc;
 970
 971         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 972                 error = gfs2_quota_check(ip, nuid, ngid);
 973                 if (error)
 974                         goto out_gunlock_q;
 975         }
 976
 977         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
 978         if (error)
 979                 goto out_gunlock_q;
 980
 981         error = gfs2_meta_inode_buffer(ip, &dibh);
 982         if (error)
 983                 goto out_end_trans;
 984
 985         error = inode_setattr(inode, attr);
 986         gfs2_assert_warn(sdp, !error);
 987
 988         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 989         gfs2_dinode_out(ip, dibh->b_data);
 990         brelse(dibh);
 991
 992         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 993                 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
 994                 gfs2_quota_change(ip, -blocks, ouid, ogid);
 995                 gfs2_quota_change(ip, blocks, nuid, ngid);
 996         }
 997
 998 out_end_trans:
 999         gfs2_trans_end(sdp);
1000 out_gunlock_q:
1001         gfs2_quota_unlock(ip);
1002 out_alloc:
1003         gfs2_alloc_put(ip);
1004         return error;
1005 }
1006
1007 /**
1008  * gfs2_setattr - Change attributes on an inode
1009  * @dentry: The dentry which is changing
1010  * @attr: The structure describing the change
1011  *
1012  * The VFS layer wants to change one or more of an inodes attributes.  Write
1013  * that change out to disk.
1014  *
1015  * Returns: errno
1016  */
1017
1018 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1019 {
1020         struct inode *inode = dentry->d_inode;
1021         struct gfs2_inode *ip = GFS2_I(inode);
1022         struct gfs2_holder i_gh;
1023         int error;
1024
1025         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1026         if (error)
1027                 return error;
1028
1029         error = -EPERM;
1030         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1031                 goto out;
1032
1033         error = inode_change_ok(inode, attr);
1034         if (error)
1035                 goto out;
1036
1037         if (attr->ia_valid & ATTR_SIZE)
1038                 error = setattr_size(inode, attr);
1039         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1040                 error = setattr_chown(inode, attr);
1041         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1042                 error = gfs2_acl_chmod(ip, attr);
1043         else
1044                 error = gfs2_setattr_simple(ip, attr);
1045
1046 out:
1047         gfs2_glock_dq_uninit(&i_gh);
1048         if (!error)
1049                 mark_inode_dirty(inode);
1050         return error;
1051 }
1052
1053 /**
1054  * gfs2_getattr - Read out an inode's attributes
1055  * @mnt: The vfsmount the inode is being accessed from
1056  * @dentry: The dentry to stat
1057  * @stat: The inode's stats
1058  *
1059  * This may be called from the VFS directly, or from within GFS2 with the
1060  * inode locked, so we look to see if the glock is already locked and only
1061  * lock the glock if its not already been done. Note that its the NFS
1062  * readdirplus operation which causes this to be called (from filldir)
1063  * with the glock already held.
1064  *
1065  * Returns: errno
1066  */
1067
1068 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1069                         struct kstat *stat)
1070 {
1071         struct inode *inode = dentry->d_inode;
1072         struct gfs2_inode *ip = GFS2_I(inode);
1073         struct gfs2_holder gh;
1074         int error;
1075         int unlock = 0;
1076
1077         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1078                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1079                 if (error)
1080                         return error;
1081                 unlock = 1;
1082         }
1083
1084         generic_fillattr(inode, stat);
1085         if (unlock)
1086                 gfs2_glock_dq_uninit(&gh);
1087
1088         return 0;
1089 }
1090
1091 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1092                          const void *data, size_t size, int flags)
1093 {
1094         struct inode *inode = dentry->d_inode;
1095         struct gfs2_ea_request er;
1096
1097         memset(&er, 0, sizeof(struct gfs2_ea_request));
1098         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1099         if (er.er_type == GFS2_EATYPE_UNUSED)
1100                 return -EOPNOTSUPP;
1101         er.er_data = (char *)data;
1102         er.er_name_len = strlen(er.er_name);
1103         er.er_data_len = size;
1104         er.er_flags = flags;
1105
1106         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1107
1108         return gfs2_ea_set(GFS2_I(inode), &er);
1109 }
1110
1111 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1112                              void *data, size_t size)
1113 {
1114         struct gfs2_ea_request er;
1115
1116         memset(&er, 0, sizeof(struct gfs2_ea_request));
1117         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1118         if (er.er_type == GFS2_EATYPE_UNUSED)
1119                 return -EOPNOTSUPP;
1120         er.er_data = data;
1121         er.er_name_len = strlen(er.er_name);
1122         er.er_data_len = size;
1123
1124         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1125 }
1126
1127 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1128 {
1129         struct gfs2_ea_request er;
1130
1131         memset(&er, 0, sizeof(struct gfs2_ea_request));
1132         er.er_data = (size) ? buffer : NULL;
1133         er.er_data_len = size;
1134
1135         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1136 }
1137
1138 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1139 {
1140         struct gfs2_ea_request er;
1141
1142         memset(&er, 0, sizeof(struct gfs2_ea_request));
1143         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1144         if (er.er_type == GFS2_EATYPE_UNUSED)
1145                 return -EOPNOTSUPP;
1146         er.er_name_len = strlen(er.er_name);
1147
1148         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1149 }
1150
1151 const struct inode_operations gfs2_file_iops = {
1152         .permission = gfs2_permission,
1153         .setattr = gfs2_setattr,
1154         .getattr = gfs2_getattr,
1155         .setxattr = gfs2_setxattr,
1156         .getxattr = gfs2_getxattr,
1157         .listxattr = gfs2_listxattr,
1158         .removexattr = gfs2_removexattr,
1159 };
1160
1161 const struct inode_operations gfs2_dir_iops = {
1162         .create = gfs2_create,
1163         .lookup = gfs2_lookup,
1164         .link = gfs2_link,
1165         .unlink = gfs2_unlink,
1166         .symlink = gfs2_symlink,
1167         .mkdir = gfs2_mkdir,
1168         .rmdir = gfs2_rmdir,
1169         .mknod = gfs2_mknod,
1170         .rename = gfs2_rename,
1171         .permission = gfs2_permission,
1172         .setattr = gfs2_setattr,
1173         .getattr = gfs2_getattr,
1174         .setxattr = gfs2_setxattr,
1175         .getxattr = gfs2_getxattr,
1176         .listxattr = gfs2_listxattr,
1177         .removexattr = gfs2_removexattr,
1178 };
1179
1180 const struct inode_operations gfs2_symlink_iops = {
1181         .readlink = gfs2_readlink,
1182         .follow_link = gfs2_follow_link,
1183         .permission = gfs2_permission,
1184         .setattr = gfs2_setattr,
1185         .getattr = gfs2_getattr,
1186         .setxattr = gfs2_setxattr,
1187         .getxattr = gfs2_getxattr,
1188         .listxattr = gfs2_listxattr,
1189         .removexattr = gfs2_removexattr,
1190 };
1191