fs/gfs2/ops_inode.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/namei.h>
  15 #include <linux/utsname.h>
  16 #include <linux/mm.h>
  17 #include <linux/xattr.h>
  18 #include <linux/posix_acl.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/crc32.h>
  21 #include <linux/lm_interface.h>
  22 #include <asm/uaccess.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "acl.h"
  27 #include "bmap.h"
  28 #include "dir.h"
  29 #include "eaops.h"
  30 #include "eattr.h"
  31 #include "glock.h"
  32 #include "inode.h"
  33 #include "meta_io.h"
  34 #include "ops_dentry.h"
  35 #include "ops_inode.h"
  36 #include "quota.h"
  37 #include "rgrp.h"
  38 #include "trans.h"
  39 #include "util.h"
  40
  41 /**
  42  * gfs2_create - Create a file
  43  * @dir: The directory in which to create the file
  44  * @dentry: The dentry of the new file
  45  * @mode: The mode of the new file
  46  *
  47  * Returns: errno
  48  */
  49
  50 static int gfs2_create(struct inode *dir, struct dentry *dentry,
  51                        int mode, struct nameidata *nd)
  52 {
  53         struct gfs2_inode *dip = GFS2_I(dir);
  54         struct gfs2_sbd *sdp = GFS2_SB(dir);
  55         struct gfs2_holder ghs[2];
  56         struct inode *inode;
  57
  58         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
  59
  60         for (;;) {
  61                 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
  62                 if (!IS_ERR(inode)) {
  63                         gfs2_trans_end(sdp);
  64                         if (dip->i_alloc->al_rgd)
  65                                 gfs2_inplace_release(dip);
  66                         gfs2_quota_unlock(dip);
  67                         gfs2_alloc_put(dip);
  68                         gfs2_glock_dq_uninit_m(2, ghs);
  69                         mark_inode_dirty(inode);
  70                         break;
  71                 } else if (PTR_ERR(inode) != -EEXIST ||
  72                            (nd && (nd->intent.open.flags & O_EXCL))) {
  73                         gfs2_holder_uninit(ghs);
  74                         return PTR_ERR(inode);
  75                 }
  76
  77                 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
  78                 if (inode) {
  79                         if (!IS_ERR(inode)) {
  80                                 gfs2_holder_uninit(ghs);
  81                                 break;
  82                         } else {
  83                                 gfs2_holder_uninit(ghs);
  84                                 return PTR_ERR(inode);
  85                         }
  86                 }
  87         }
  88
  89         d_instantiate(dentry, inode);
  90
  91         return 0;
  92 }
  93
  94 /**
  95  * gfs2_lookup - Look up a filename in a directory and return its inode
  96  * @dir: The directory inode
  97  * @dentry: The dentry of the new inode
  98  * @nd: passed from Linux VFS, ignored by us
  99  *
 100  * Called by the VFS layer. Lock dir and call gfs2_lookupi()
 101  *
 102  * Returns: errno
 103  */
 104
 105 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 106                                   struct nameidata *nd)
 107 {
 108         struct inode *inode = NULL;
 109
 110         dentry->d_op = &gfs2_dops;
 111
 112         inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
 113         if (inode && IS_ERR(inode))
 114                 return ERR_PTR(PTR_ERR(inode));
 115
 116         if (inode) {
 117                 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
 204                 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 205                 if (error)
 206                         goto out_alloc;
 207
 208                 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
 209                 if (error)
 210                         goto out_gunlock_q;
 211
 212                 al->al_requested = sdp->sd_max_dirres;
 213
 214                 error = gfs2_inplace_reserve(dip);
 215                 if (error)
 216                         goto out_gunlock_q;
 217
 218                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 219                                          al->al_rgd->rd_length +
 220                                          2 * RES_DINODE + RES_STATFS +
 221                                          RES_QUOTA, 0);
 222                 if (error)
 223                         goto out_ipres;
 224         } else {
 225                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 226                 if (error)
 227                         goto out_ipres;
 228         }
 229
 230         error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
 231         if (error)
 232                 goto out_end_trans;
 233
 234         error = gfs2_change_nlink(ip, +1);
 235
 236 out_end_trans:
 237         gfs2_trans_end(sdp);
 238 out_ipres:
 239         if (alloc_required)
 240                 gfs2_inplace_release(dip);
 241 out_gunlock_q:
 242         if (alloc_required)
 243                 gfs2_quota_unlock(dip);
 244 out_alloc:
 245         if (alloc_required)
 246                 gfs2_alloc_put(dip);
 247 out_gunlock:
 248         gfs2_glock_dq_m(2, ghs);
 249 out:
 250         gfs2_holder_uninit(ghs);
 251         gfs2_holder_uninit(ghs + 1);
 252         if (!error) {
 253                 atomic_inc(&inode->i_count);
 254                 d_instantiate(dentry, inode);
 255                 mark_inode_dirty(inode);
 256         }
 257         return error;
 258 }
 259
 260 /**
 261  * gfs2_unlink - Unlink a file
 262  * @dir: The inode of the directory containing the file to unlink
 263  * @dentry: The file itself
 264  *
 265  * Unlink a file.  Call gfs2_unlinki()
 266  *
 267  * Returns: errno
 268  */
 269
 270 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 271 {
 272         struct gfs2_inode *dip = GFS2_I(dir);
 273         struct gfs2_sbd *sdp = GFS2_SB(dir);
 274         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 275         struct gfs2_holder ghs[3];
 276         struct gfs2_rgrpd *rgd;
 277         struct gfs2_holder ri_gh;
 278         int error;
 279
 280         error = gfs2_rindex_hold(sdp, &ri_gh);
 281         if (error)
 282                 return error;
 283
 284         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 285         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
 286
 287         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 288         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 289
 290
 291         error = gfs2_glock_nq(ghs); /* parent */
 292         if (error)
 293                 goto out_parent;
 294
 295         error = gfs2_glock_nq(ghs + 1); /* child */
 296         if (error)
 297                 goto out_child;
 298
 299         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 300         if (error)
 301                 goto out_rgrp;
 302
 303         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 304         if (error)
 305                 goto out_rgrp;
 306
 307         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 308         if (error)
 309                 goto out_rgrp;
 310
 311         error = gfs2_dir_del(dip, &dentry->d_name);
 312         if (error)
 313                 goto out_end_trans;
 314
 315         error = gfs2_change_nlink(ip, -1);
 316
 317 out_end_trans:
 318         gfs2_trans_end(sdp);
 319         gfs2_glock_dq(ghs + 2);
 320 out_rgrp:
 321         gfs2_holder_uninit(ghs + 2);
 322         gfs2_glock_dq(ghs + 1);
 323 out_child:
 324         gfs2_holder_uninit(ghs + 1);
 325         gfs2_glock_dq(ghs);
 326 out_parent:
 327         gfs2_holder_uninit(ghs);
 328         gfs2_glock_dq_uninit(&ri_gh);
 329         return error;
 330 }
 331
 332 /**
 333  * gfs2_symlink - Create a symlink
 334  * @dir: The directory to create the symlink in
 335  * @dentry: The dentry to put the symlink in
 336  * @symname: The thing which the link points to
 337  *
 338  * Returns: errno
 339  */
 340
 341 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 342                         const char *symname)
 343 {
 344         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 345         struct gfs2_sbd *sdp = GFS2_SB(dir);
 346         struct gfs2_holder ghs[2];
 347         struct inode *inode;
 348         struct buffer_head *dibh;
 349         int size;
 350         int error;
 351
 352         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 353         size = strlen(symname);
 354         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 355                 return -ENAMETOOLONG;
 356
 357         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 358
 359         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 360         if (IS_ERR(inode)) {
 361                 gfs2_holder_uninit(ghs);
 362                 return PTR_ERR(inode);
 363         }
 364
 365         ip = ghs[1].gh_gl->gl_object;
 366
 367         ip->i_di.di_size = size;
 368
 369         error = gfs2_meta_inode_buffer(ip, &dibh);
 370
 371         if (!gfs2_assert_withdraw(sdp, !error)) {
 372                 gfs2_dinode_out(ip, dibh->b_data);
 373                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 374                        size);
 375                 brelse(dibh);
 376         }
 377
 378         gfs2_trans_end(sdp);
 379         if (dip->i_alloc->al_rgd)
 380                 gfs2_inplace_release(dip);
 381         gfs2_quota_unlock(dip);
 382         gfs2_alloc_put(dip);
 383
 384         gfs2_glock_dq_uninit_m(2, ghs);
 385
 386         d_instantiate(dentry, inode);
 387         mark_inode_dirty(inode);
 388
 389         return 0;
 390 }
 391
 392 /**
 393  * gfs2_mkdir - Make a directory
 394  * @dir: The parent directory of the new one
 395  * @dentry: The dentry of the new directory
 396  * @mode: The mode of the new directory
 397  *
 398  * Returns: errno
 399  */
 400
 401 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 402 {
 403         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 404         struct gfs2_sbd *sdp = GFS2_SB(dir);
 405         struct gfs2_holder ghs[2];
 406         struct inode *inode;
 407         struct buffer_head *dibh;
 408         int error;
 409
 410         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 411
 412         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 413         if (IS_ERR(inode)) {
 414                 gfs2_holder_uninit(ghs);
 415                 return PTR_ERR(inode);
 416         }
 417
 418         ip = ghs[1].gh_gl->gl_object;
 419
 420         ip->i_inode.i_nlink = 2;
 421         ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 422         ip->i_di.di_flags |= GFS2_DIF_JDATA;
 423         ip->i_di.di_entries = 2;
 424
 425         error = gfs2_meta_inode_buffer(ip, &dibh);
 426
 427         if (!gfs2_assert_withdraw(sdp, !error)) {
 428                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 429                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 430                 struct qstr str;
 431
 432                 gfs2_str2qstr(&str, ".");
 433                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 434                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 435                 dent->de_inum = di->di_num; /* already GFS2 endian */
 436                 dent->de_type = cpu_to_be16(DT_DIR);
 437                 di->di_entries = cpu_to_be32(1);
 438
 439                 gfs2_str2qstr(&str, "..");
 440                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 441                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 442
 443                 gfs2_inum_out(dip, dent);
 444                 dent->de_type = cpu_to_be16(DT_DIR);
 445
 446                 gfs2_dinode_out(ip, di);
 447
 448                 brelse(dibh);
 449         }
 450
 451         error = gfs2_change_nlink(dip, +1);
 452         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 453
 454         gfs2_trans_end(sdp);
 455         if (dip->i_alloc->al_rgd)
 456                 gfs2_inplace_release(dip);
 457         gfs2_quota_unlock(dip);
 458         gfs2_alloc_put(dip);
 459
 460         gfs2_glock_dq_uninit_m(2, ghs);
 461
 462         d_instantiate(dentry, inode);
 463         mark_inode_dirty(inode);
 464
 465         return 0;
 466 }
 467
 468 /**
 469  * gfs2_rmdir - Remove a directory
 470  * @dir: The parent directory of the directory to be removed
 471  * @dentry: The dentry of the directory to remove
 472  *
 473  * Remove a directory. Call gfs2_rmdiri()
 474  *
 475  * Returns: errno
 476  */
 477
 478 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 479 {
 480         struct gfs2_inode *dip = GFS2_I(dir);
 481         struct gfs2_sbd *sdp = GFS2_SB(dir);
 482         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 483         struct gfs2_holder ghs[3];
 484         struct gfs2_rgrpd *rgd;
 485         struct gfs2_holder ri_gh;
 486         int error;
 487
 488
 489         error = gfs2_rindex_hold(sdp, &ri_gh);
 490         if (error)
 491                 return error;
 492         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 493         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 494
 495         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 496         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 497
 498         error = gfs2_glock_nq_m(3, ghs);
 499         if (error)
 500                 goto out;
 501
 502         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 503         if (error)
 504                 goto out_gunlock;
 505
 506         if (ip->i_di.di_entries < 2) {
 507                 if (gfs2_consist_inode(ip))
 508                         gfs2_dinode_print(ip);
 509                 error = -EIO;
 510                 goto out_gunlock;
 511         }
 512         if (ip->i_di.di_entries > 2) {
 513                 error = -ENOTEMPTY;
 514                 goto out_gunlock;
 515         }
 516
 517         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 518         if (error)
 519                 goto out_gunlock;
 520
 521         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 522
 523         gfs2_trans_end(sdp);
 524
 525 out_gunlock:
 526         gfs2_glock_dq_m(3, ghs);
 527 out:
 528         gfs2_holder_uninit(ghs);
 529         gfs2_holder_uninit(ghs + 1);
 530         gfs2_holder_uninit(ghs + 2);
 531         gfs2_glock_dq_uninit(&ri_gh);
 532         return error;
 533 }
 534
 535 /**
 536  * gfs2_mknod - Make a special file
 537  * @dir: The directory in which the special file will reside
 538  * @dentry: The dentry of the special file
 539  * @mode: The mode of the special file
 540  * @rdev: The device specification of the special file
 541  *
 542  */
 543
 544 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 545                       dev_t dev)
 546 {
 547         struct gfs2_inode *dip = GFS2_I(dir);
 548         struct gfs2_sbd *sdp = GFS2_SB(dir);
 549         struct gfs2_holder ghs[2];
 550         struct inode *inode;
 551
 552         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 553
 554         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 555         if (IS_ERR(inode)) {
 556                 gfs2_holder_uninit(ghs);
 557                 return PTR_ERR(inode);
 558         }
 559
 560         gfs2_trans_end(sdp);
 561         if (dip->i_alloc->al_rgd)
 562                 gfs2_inplace_release(dip);
 563         gfs2_quota_unlock(dip);
 564         gfs2_alloc_put(dip);
 565
 566         gfs2_glock_dq_uninit_m(2, ghs);
 567
 568         d_instantiate(dentry, inode);
 569         mark_inode_dirty(inode);
 570
 571         return 0;
 572 }
 573
 574 /**
 575  * gfs2_rename - Rename a file
 576  * @odir: Parent directory of old file name
 577  * @odentry: The old dentry of the file
 578  * @ndir: Parent directory of new file name
 579  * @ndentry: The new dentry of the file
 580  *
 581  * Returns: errno
 582  */
 583
 584 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 585                        struct inode *ndir, struct dentry *ndentry)
 586 {
 587         struct gfs2_inode *odip = GFS2_I(odir);
 588         struct gfs2_inode *ndip = GFS2_I(ndir);
 589         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 590         struct gfs2_inode *nip = NULL;
 591         struct gfs2_sbd *sdp = GFS2_SB(odir);
 592         struct gfs2_holder ghs[5], r_gh;
 593         struct gfs2_rgrpd *nrgd;
 594         unsigned int num_gh;
 595         int dir_rename = 0;
 596         int alloc_required;
 597         unsigned int x;
 598         int error;
 599
 600         if (ndentry->d_inode) {
 601                 nip = GFS2_I(ndentry->d_inode);
 602                 if (ip == nip)
 603                         return 0;
 604         }
 605
 606         /* Make sure we aren't trying to move a dirctory into it's subdir */
 607
 608         if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
 609                 dir_rename = 1;
 610
 611                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
 612                                            &r_gh);
 613                 if (error)
 614                         goto out;
 615
 616                 error = gfs2_ok_to_move(ip, ndip);
 617                 if (error)
 618                         goto out_gunlock_r;
 619         }
 620
 621         num_gh = 1;
 622         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 623         if (odip != ndip) {
 624                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 625                 num_gh++;
 626         }
 627         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 628         num_gh++;
 629
 630         if (nip) {
 631                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 632                 num_gh++;
 633                 /* grab the resource lock for unlink flag twiddling
 634                  * this is the case of the target file already existing
 635                  * so we unlink before doing the rename
 636                  */
 637                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
 638                 if (nrgd)
 639                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
 640         }
 641
 642         error = gfs2_glock_nq_m(num_gh, ghs);
 643         if (error)
 644                 goto out_uninit;
 645
 646         /* Check out the old directory */
 647
 648         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 649         if (error)
 650                 goto out_gunlock;
 651
 652         /* Check out the new directory */
 653
 654         if (nip) {
 655                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 656                 if (error)
 657                         goto out_gunlock;
 658
 659                 if (S_ISDIR(nip->i_inode.i_mode)) {
 660                         if (nip->i_di.di_entries < 2) {
 661                                 if (gfs2_consist_inode(nip))
 662                                         gfs2_dinode_print(nip);
 663                                 error = -EIO;
 664                                 goto out_gunlock;
 665                         }
 666                         if (nip->i_di.di_entries > 2) {
 667                                 error = -ENOTEMPTY;
 668                                 goto out_gunlock;
 669                         }
 670                 }
 671         } else {
 672                 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
 673                 if (error)
 674                         goto out_gunlock;
 675
 676                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
 677                 switch (error) {
 678                 case -ENOENT:
 679                         error = 0;
 680                         break;
 681                 case 0:
 682                         error = -EEXIST;
 683                 default:
 684                         goto out_gunlock;
 685                 };
 686
 687                 if (odip != ndip) {
 688                         if (!ndip->i_inode.i_nlink) {
 689                                 error = -EINVAL;
 690                                 goto out_gunlock;
 691                         }
 692                         if (ndip->i_di.di_entries == (u32)-1) {
 693                                 error = -EFBIG;
 694                                 goto out_gunlock;
 695                         }
 696                         if (S_ISDIR(ip->i_inode.i_mode) &&
 697                             ndip->i_inode.i_nlink == (u32)-1) {
 698                                 error = -EMLINK;
 699                                 goto out_gunlock;
 700                         }
 701                 }
 702         }
 703
 704         /* Check out the dir to be renamed */
 705
 706         if (dir_rename) {
 707                 error = permission(odentry->d_inode, MAY_WRITE, NULL);
 708                 if (error)
 709                         goto out_gunlock;
 710         }
 711
 712         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 713         if (error < 0)
 714                 goto out_gunlock;
 715         error = 0;
 716
 717         if (alloc_required) {
 718                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 719
 720                 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 721                 if (error)
 722                         goto out_alloc;
 723
 724                 error = gfs2_quota_check(ndip, ndip->i_inode.i_uid, ndip->i_inode.i_gid);
 725                 if (error)
 726                         goto out_gunlock_q;
 727
 728                 al->al_requested = sdp->sd_max_dirres;
 729
 730                 error = gfs2_inplace_reserve(ndip);
 731                 if (error)
 732                         goto out_gunlock_q;
 733
 734                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 735                                          al->al_rgd->rd_length +
 736                                          4 * RES_DINODE + 4 * RES_LEAF +
 737                                          RES_STATFS + RES_QUOTA + 4, 0);
 738                 if (error)
 739                         goto out_ipreserv;
 740         } else {
 741                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 742                                          5 * RES_LEAF + 4, 0);
 743                 if (error)
 744                         goto out_gunlock;
 745         }
 746
 747         /* Remove the target file, if it exists */
 748
 749         if (nip) {
 750                 if (S_ISDIR(nip->i_inode.i_mode))
 751                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 752                 else {
 753                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 754                         if (error)
 755                                 goto out_end_trans;
 756                         error = gfs2_change_nlink(nip, -1);
 757                 }
 758                 if (error)
 759                         goto out_end_trans;
 760         }
 761
 762         if (dir_rename) {
 763                 struct qstr name;
 764                 gfs2_str2qstr(&name, "..");
 765
 766                 error = gfs2_change_nlink(ndip, +1);
 767                 if (error)
 768                         goto out_end_trans;
 769                 error = gfs2_change_nlink(odip, -1);
 770                 if (error)
 771                         goto out_end_trans;
 772
 773                 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
 774                 if (error)
 775                         goto out_end_trans;
 776         } else {
 777                 struct buffer_head *dibh;
 778                 error = gfs2_meta_inode_buffer(ip, &dibh);
 779                 if (error)
 780                         goto out_end_trans;
 781                 ip->i_inode.i_ctime = CURRENT_TIME;
 782                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 783                 gfs2_dinode_out(ip, dibh->b_data);
 784                 brelse(dibh);
 785         }
 786
 787         error = gfs2_dir_del(odip, &odentry->d_name);
 788         if (error)
 789                 goto out_end_trans;
 790
 791         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
 792         if (error)
 793                 goto out_end_trans;
 794
 795 out_end_trans:
 796         gfs2_trans_end(sdp);
 797 out_ipreserv:
 798         if (alloc_required)
 799                 gfs2_inplace_release(ndip);
 800 out_gunlock_q:
 801         if (alloc_required)
 802                 gfs2_quota_unlock(ndip);
 803 out_alloc:
 804         if (alloc_required)
 805                 gfs2_alloc_put(ndip);
 806 out_gunlock:
 807         gfs2_glock_dq_m(num_gh, ghs);
 808 out_uninit:
 809         for (x = 0; x < num_gh; x++)
 810                 gfs2_holder_uninit(ghs + x);
 811 out_gunlock_r:
 812         if (dir_rename)
 813                 gfs2_glock_dq_uninit(&r_gh);
 814 out:
 815         return error;
 816 }
 817
 818 /**
 819  * gfs2_readlink - Read the value of a symlink
 820  * @dentry: the symlink
 821  * @buf: the buffer to read the symlink data into
 822  * @size: the size of the buffer
 823  *
 824  * Returns: errno
 825  */
 826
 827 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 828                          int user_size)
 829 {
 830         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 831         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 832         unsigned int len = GFS2_FAST_NAME_SIZE;
 833         int error;
 834
 835         error = gfs2_readlinki(ip, &buf, &len);
 836         if (error)
 837                 return error;
 838
 839         if (user_size > len - 1)
 840                 user_size = len - 1;
 841
 842         if (copy_to_user(user_buf, buf, user_size))
 843                 error = -EFAULT;
 844         else
 845                 error = user_size;
 846
 847         if (buf != array)
 848                 kfree(buf);
 849
 850         return error;
 851 }
 852
 853 /**
 854  * gfs2_follow_link - Follow a symbolic link
 855  * @dentry: The dentry of the link
 856  * @nd: Data that we pass to vfs_follow_link()
 857  *
 858  * This can handle symlinks of any size. It is optimised for symlinks
 859  * under GFS2_FAST_NAME_SIZE.
 860  *
 861  * Returns: 0 on success or error code
 862  */
 863
 864 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 865 {
 866         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 867         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 868         unsigned int len = GFS2_FAST_NAME_SIZE;
 869         int error;
 870
 871         error = gfs2_readlinki(ip, &buf, &len);
 872         if (!error) {
 873                 error = vfs_follow_link(nd, buf);
 874                 if (buf != array)
 875                         kfree(buf);
 876         }
 877
 878         return ERR_PTR(error);
 879 }
 880
 881 /**
 882  * gfs2_permission -
 883  * @inode:
 884  * @mask:
 885  * @nd: passed from Linux VFS, ignored by us
 886  *
 887  * This may be called from the VFS directly, or from within GFS2 with the
 888  * inode locked, so we look to see if the glock is already locked and only
 889  * lock the glock if its not already been done.
 890  *
 891  * Returns: errno
 892  */
 893
 894 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
 895 {
 896         struct gfs2_inode *ip = GFS2_I(inode);
 897         struct gfs2_holder i_gh;
 898         int error;
 899         int unlock = 0;
 900
 901         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
 902                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 903                 if (error)
 904                         return error;
 905                 unlock = 1;
 906         }
 907
 908         error = generic_permission(inode, mask, gfs2_check_acl);
 909         if (unlock)
 910                 gfs2_glock_dq_uninit(&i_gh);
 911
 912         return error;
 913 }
 914
 915 static int setattr_size(struct inode *inode, struct iattr *attr)
 916 {
 917         struct gfs2_inode *ip = GFS2_I(inode);
 918         struct gfs2_sbd *sdp = GFS2_SB(inode);
 919         int error;
 920
 921         if (attr->ia_size != ip->i_di.di_size) {
 922                 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
 923                 if (error)
 924                         return error;
 925                 error = vmtruncate(inode, attr->ia_size);
 926                 gfs2_trans_end(sdp);
 927                 if (error)
 928                         return error;
 929         }
 930
 931         error = gfs2_truncatei(ip, attr->ia_size);
 932         if (error && (inode->i_size != ip->i_di.di_size))
 933                 i_size_write(inode, ip->i_di.di_size);
 934
 935         return error;
 936 }
 937
 938 static int setattr_chown(struct inode *inode, struct iattr *attr)
 939 {
 940         struct gfs2_inode *ip = GFS2_I(inode);
 941         struct gfs2_sbd *sdp = GFS2_SB(inode);
 942         struct buffer_head *dibh;
 943         u32 ouid, ogid, nuid, ngid;
 944         int error;
 945
 946         ouid = inode->i_uid;
 947         ogid = inode->i_gid;
 948         nuid = attr->ia_uid;
 949         ngid = attr->ia_gid;
 950
 951         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
 952                 ouid = nuid = NO_QUOTA_CHANGE;
 953         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
 954                 ogid = ngid = NO_QUOTA_CHANGE;
 955
 956         gfs2_alloc_get(ip);
 957
 958         error = gfs2_quota_lock(ip, nuid, ngid);
 959         if (error)
 960                 goto out_alloc;
 961
 962         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 963                 error = gfs2_quota_check(ip, nuid, ngid);
 964                 if (error)
 965                         goto out_gunlock_q;
 966         }
 967
 968         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
 969         if (error)
 970                 goto out_gunlock_q;
 971
 972         error = gfs2_meta_inode_buffer(ip, &dibh);
 973         if (error)
 974                 goto out_end_trans;
 975
 976         error = inode_setattr(inode, attr);
 977         gfs2_assert_warn(sdp, !error);
 978
 979         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 980         gfs2_dinode_out(ip, dibh->b_data);
 981         brelse(dibh);
 982
 983         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
 984                 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
 985                 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
 986         }
 987
 988 out_end_trans:
 989         gfs2_trans_end(sdp);
 990 out_gunlock_q:
 991         gfs2_quota_unlock(ip);
 992 out_alloc:
 993         gfs2_alloc_put(ip);
 994         return error;
 995 }
 996
 997 /**
 998  * gfs2_setattr - Change attributes on an inode
 999  * @dentry: The dentry which is changing
1000  * @attr: The structure describing the change
1001  *
1002  * The VFS layer wants to change one or more of an inodes attributes.  Write
1003  * that change out to disk.
1004  *
1005  * Returns: errno
1006  */
1007
1008 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1009 {
1010         struct inode *inode = dentry->d_inode;
1011         struct gfs2_inode *ip = GFS2_I(inode);
1012         struct gfs2_holder i_gh;
1013         int error;
1014
1015         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1016         if (error)
1017                 return error;
1018
1019         error = -EPERM;
1020         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1021                 goto out;
1022
1023         error = inode_change_ok(inode, attr);
1024         if (error)
1025                 goto out;
1026
1027         if (attr->ia_valid & ATTR_SIZE)
1028                 error = setattr_size(inode, attr);
1029         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1030                 error = setattr_chown(inode, attr);
1031         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1032                 error = gfs2_acl_chmod(ip, attr);
1033         else
1034                 error = gfs2_setattr_simple(ip, attr);
1035
1036 out:
1037         gfs2_glock_dq_uninit(&i_gh);
1038         if (!error)
1039                 mark_inode_dirty(inode);
1040         return error;
1041 }
1042
1043 /**
1044  * gfs2_getattr - Read out an inode's attributes
1045  * @mnt: The vfsmount the inode is being accessed from
1046  * @dentry: The dentry to stat
1047  * @stat: The inode's stats
1048  *
1049  * This may be called from the VFS directly, or from within GFS2 with the
1050  * inode locked, so we look to see if the glock is already locked and only
1051  * lock the glock if its not already been done. Note that its the NFS
1052  * readdirplus operation which causes this to be called (from filldir)
1053  * with the glock already held.
1054  *
1055  * Returns: errno
1056  */
1057
1058 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1059                         struct kstat *stat)
1060 {
1061         struct inode *inode = dentry->d_inode;
1062         struct gfs2_inode *ip = GFS2_I(inode);
1063         struct gfs2_holder gh;
1064         int error;
1065         int unlock = 0;
1066
1067         if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
1068                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1069                 if (error)
1070                         return error;
1071                 unlock = 1;
1072         }
1073
1074         generic_fillattr(inode, stat);
1075         if (unlock)
1076                 gfs2_glock_dq_uninit(&gh);
1077
1078         return 0;
1079 }
1080
1081 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1082                          const void *data, size_t size, int flags)
1083 {
1084         struct inode *inode = dentry->d_inode;
1085         struct gfs2_ea_request er;
1086
1087         memset(&er, 0, sizeof(struct gfs2_ea_request));
1088         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1089         if (er.er_type == GFS2_EATYPE_UNUSED)
1090                 return -EOPNOTSUPP;
1091         er.er_data = (char *)data;
1092         er.er_name_len = strlen(er.er_name);
1093         er.er_data_len = size;
1094         er.er_flags = flags;
1095
1096         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1097
1098         return gfs2_ea_set(GFS2_I(inode), &er);
1099 }
1100
1101 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1102                              void *data, size_t size)
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_data = data;
1111         er.er_name_len = strlen(er.er_name);
1112         er.er_data_len = size;
1113
1114         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1115 }
1116
1117 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1118 {
1119         struct gfs2_ea_request er;
1120
1121         memset(&er, 0, sizeof(struct gfs2_ea_request));
1122         er.er_data = (size) ? buffer : NULL;
1123         er.er_data_len = size;
1124
1125         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1126 }
1127
1128 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1129 {
1130         struct gfs2_ea_request er;
1131
1132         memset(&er, 0, sizeof(struct gfs2_ea_request));
1133         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1134         if (er.er_type == GFS2_EATYPE_UNUSED)
1135                 return -EOPNOTSUPP;
1136         er.er_name_len = strlen(er.er_name);
1137
1138         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1139 }
1140
1141 const struct inode_operations gfs2_file_iops = {
1142         .permission = gfs2_permission,
1143         .setattr = gfs2_setattr,
1144         .getattr = gfs2_getattr,
1145         .setxattr = gfs2_setxattr,
1146         .getxattr = gfs2_getxattr,
1147         .listxattr = gfs2_listxattr,
1148         .removexattr = gfs2_removexattr,
1149 };
1150
1151 const struct inode_operations gfs2_dev_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