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/fiemap.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 "quota.h"
  35 #include "rgrp.h"
  36 #include "trans.h"
  37 #include "util.h"
  38 #include "super.h"
  39
  40 /**
  41  * gfs2_create - Create a file
  42  * @dir: The directory in which to create the file
  43  * @dentry: The dentry of the new file
  44  * @mode: The mode of the new file
  45  *
  46  * Returns: errno
  47  */
  48
  49 static int gfs2_create(struct inode *dir, struct dentry *dentry,
  50                        int mode, struct nameidata *nd)
  51 {
  52         struct gfs2_inode *dip = GFS2_I(dir);
  53         struct gfs2_sbd *sdp = GFS2_SB(dir);
  54         struct gfs2_holder ghs[2];
  55         struct inode *inode;
  56
  57         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
  58
  59         for (;;) {
  60                 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
  61                 if (!IS_ERR(inode)) {
  62                         gfs2_trans_end(sdp);
  63                         if (dip->i_alloc->al_rgd)
  64                                 gfs2_inplace_release(dip);
  65                         gfs2_quota_unlock(dip);
  66                         gfs2_alloc_put(dip);
  67                         gfs2_glock_dq_uninit_m(2, ghs);
  68                         mark_inode_dirty(inode);
  69                         break;
  70                 } else if (PTR_ERR(inode) != -EEXIST ||
  71                            (nd && nd->flags & LOOKUP_EXCL)) {
  72                         gfs2_holder_uninit(ghs);
  73                         return PTR_ERR(inode);
  74                 }
  75
  76                 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
  77                 if (inode) {
  78                         if (!IS_ERR(inode)) {
  79                                 gfs2_holder_uninit(ghs);
  80                                 break;
  81                         } else {
  82                                 gfs2_holder_uninit(ghs);
  83                                 return PTR_ERR(inode);
  84                         }
  85                 }
  86         }
  87
  88         d_instantiate(dentry, inode);
  89
  90         return 0;
  91 }
  92
  93 /**
  94  * gfs2_lookup - Look up a filename in a directory and return its inode
  95  * @dir: The directory inode
  96  * @dentry: The dentry of the new inode
  97  * @nd: passed from Linux VFS, ignored by us
  98  *
  99  * Called by the VFS layer. Lock dir and call gfs2_lookupi()
 100  *
 101  * Returns: errno
 102  */
 103
 104 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 105                                   struct nameidata *nd)
 106 {
 107         struct inode *inode = NULL;
 108
 109         dentry->d_op = &gfs2_dops;
 110
 111         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 112         if (inode && IS_ERR(inode))
 113                 return ERR_CAST(inode);
 114
 115         if (inode) {
 116                 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
 117                 struct gfs2_holder gh;
 118                 int error;
 119                 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 120                 if (error) {
 121                         iput(inode);
 122                         return ERR_PTR(error);
 123                 }
 124                 gfs2_glock_dq_uninit(&gh);
 125                 return d_splice_alias(inode, dentry);
 126         }
 127         d_add(dentry, inode);
 128
 129         return NULL;
 130 }
 131
 132 /**
 133  * gfs2_link - Link to a file
 134  * @old_dentry: The inode to link
 135  * @dir: Add link to this directory
 136  * @dentry: The name of the link
 137  *
 138  * Link the inode in "old_dentry" into the directory "dir" with the
 139  * name in "dentry".
 140  *
 141  * Returns: errno
 142  */
 143
 144 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 145                      struct dentry *dentry)
 146 {
 147         struct gfs2_inode *dip = GFS2_I(dir);
 148         struct gfs2_sbd *sdp = GFS2_SB(dir);
 149         struct inode *inode = old_dentry->d_inode;
 150         struct gfs2_inode *ip = GFS2_I(inode);
 151         struct gfs2_holder ghs[2];
 152         int alloc_required;
 153         int error;
 154
 155         if (S_ISDIR(inode->i_mode))
 156                 return -EPERM;
 157
 158         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 159         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 160
 161         error = gfs2_glock_nq(ghs); /* parent */
 162         if (error)
 163                 goto out_parent;
 164
 165         error = gfs2_glock_nq(ghs + 1); /* child */
 166         if (error)
 167                 goto out_child;
 168
 169         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
 170         if (error)
 171                 goto out_gunlock;
 172
 173         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 174         switch (error) {
 175         case -ENOENT:
 176                 break;
 177         case 0:
 178                 error = -EEXIST;
 179         default:
 180                 goto out_gunlock;
 181         }
 182
 183         error = -EINVAL;
 184         if (!dip->i_inode.i_nlink)
 185                 goto out_gunlock;
 186         error = -EFBIG;
 187         if (dip->i_entries == (u32)-1)
 188                 goto out_gunlock;
 189         error = -EPERM;
 190         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 191                 goto out_gunlock;
 192         error = -EINVAL;
 193         if (!ip->i_inode.i_nlink)
 194                 goto out_gunlock;
 195         error = -EMLINK;
 196         if (ip->i_inode.i_nlink == (u32)-1)
 197                 goto out_gunlock;
 198
 199         alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
 200         if (error < 0)
 201                 goto out_gunlock;
 202         error = 0;
 203
 204         if (alloc_required) {
 205                 struct gfs2_alloc *al = gfs2_alloc_get(dip);
 206                 if (!al) {
 207                         error = -ENOMEM;
 208                         goto out_gunlock;
 209                 }
 210
 211                 error = gfs2_quota_lock_check(dip);
 212                 if (error)
 213                         goto out_alloc;
 214
 215                 al->al_requested = sdp->sd_max_dirres;
 216
 217                 error = gfs2_inplace_reserve(dip);
 218                 if (error)
 219                         goto out_gunlock_q;
 220
 221                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 222                                          al->al_rgd->rd_length +
 223                                          2 * RES_DINODE + RES_STATFS +
 224                                          RES_QUOTA, 0);
 225                 if (error)
 226                         goto out_ipres;
 227         } else {
 228                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 229                 if (error)
 230                         goto out_ipres;
 231         }
 232
 233         error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
 234         if (error)
 235                 goto out_end_trans;
 236
 237         error = gfs2_change_nlink(ip, +1);
 238
 239 out_end_trans:
 240         gfs2_trans_end(sdp);
 241 out_ipres:
 242         if (alloc_required)
 243                 gfs2_inplace_release(dip);
 244 out_gunlock_q:
 245         if (alloc_required)
 246                 gfs2_quota_unlock(dip);
 247 out_alloc:
 248         if (alloc_required)
 249                 gfs2_alloc_put(dip);
 250 out_gunlock:
 251         gfs2_glock_dq(ghs + 1);
 252 out_child:
 253         gfs2_glock_dq(ghs);
 254 out_parent:
 255         gfs2_holder_uninit(ghs);
 256         gfs2_holder_uninit(ghs + 1);
 257         if (!error) {
 258                 atomic_inc(&inode->i_count);
 259                 d_instantiate(dentry, inode);
 260                 mark_inode_dirty(inode);
 261         }
 262         return error;
 263 }
 264
 265 /**
 266  * gfs2_unlink - Unlink a file
 267  * @dir: The inode of the directory containing the file to unlink
 268  * @dentry: The file itself
 269  *
 270  * Unlink a file.  Call gfs2_unlinki()
 271  *
 272  * Returns: errno
 273  */
 274
 275 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
 276 {
 277         struct gfs2_inode *dip = GFS2_I(dir);
 278         struct gfs2_sbd *sdp = GFS2_SB(dir);
 279         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 280         struct gfs2_holder ghs[3];
 281         struct gfs2_rgrpd *rgd;
 282         struct gfs2_holder ri_gh;
 283         int error;
 284
 285         error = gfs2_rindex_hold(sdp, &ri_gh);
 286         if (error)
 287                 return error;
 288
 289         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 290         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
 291
 292         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 293         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 294
 295
 296         error = gfs2_glock_nq(ghs); /* parent */
 297         if (error)
 298                 goto out_parent;
 299
 300         error = gfs2_glock_nq(ghs + 1); /* child */
 301         if (error)
 302                 goto out_child;
 303
 304         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 305         if (error)
 306                 goto out_rgrp;
 307
 308         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 309         if (error)
 310                 goto out_gunlock;
 311
 312         error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
 313         if (error)
 314                 goto out_rgrp;
 315
 316         error = gfs2_dir_del(dip, &dentry->d_name);
 317         if (error)
 318                 goto out_end_trans;
 319
 320         error = gfs2_change_nlink(ip, -1);
 321
 322 out_end_trans:
 323         gfs2_trans_end(sdp);
 324 out_gunlock:
 325         gfs2_glock_dq(ghs + 2);
 326 out_rgrp:
 327         gfs2_holder_uninit(ghs + 2);
 328         gfs2_glock_dq(ghs + 1);
 329 out_child:
 330         gfs2_holder_uninit(ghs + 1);
 331         gfs2_glock_dq(ghs);
 332 out_parent:
 333         gfs2_holder_uninit(ghs);
 334         gfs2_glock_dq_uninit(&ri_gh);
 335         return error;
 336 }
 337
 338 /**
 339  * gfs2_symlink - Create a symlink
 340  * @dir: The directory to create the symlink in
 341  * @dentry: The dentry to put the symlink in
 342  * @symname: The thing which the link points to
 343  *
 344  * Returns: errno
 345  */
 346
 347 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 348                         const char *symname)
 349 {
 350         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 351         struct gfs2_sbd *sdp = GFS2_SB(dir);
 352         struct gfs2_holder ghs[2];
 353         struct inode *inode;
 354         struct buffer_head *dibh;
 355         int size;
 356         int error;
 357
 358         /* Must be stuffed with a null terminator for gfs2_follow_link() */
 359         size = strlen(symname);
 360         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
 361                 return -ENAMETOOLONG;
 362
 363         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 364
 365         inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
 366         if (IS_ERR(inode)) {
 367                 gfs2_holder_uninit(ghs);
 368                 return PTR_ERR(inode);
 369         }
 370
 371         ip = ghs[1].gh_gl->gl_object;
 372
 373         ip->i_disksize = size;
 374         i_size_write(inode, size);
 375
 376         error = gfs2_meta_inode_buffer(ip, &dibh);
 377
 378         if (!gfs2_assert_withdraw(sdp, !error)) {
 379                 gfs2_dinode_out(ip, dibh->b_data);
 380                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
 381                        size);
 382                 brelse(dibh);
 383         }
 384
 385         gfs2_trans_end(sdp);
 386         if (dip->i_alloc->al_rgd)
 387                 gfs2_inplace_release(dip);
 388         gfs2_quota_unlock(dip);
 389         gfs2_alloc_put(dip);
 390
 391         gfs2_glock_dq_uninit_m(2, ghs);
 392
 393         d_instantiate(dentry, inode);
 394         mark_inode_dirty(inode);
 395
 396         return 0;
 397 }
 398
 399 /**
 400  * gfs2_mkdir - Make a directory
 401  * @dir: The parent directory of the new one
 402  * @dentry: The dentry of the new directory
 403  * @mode: The mode of the new directory
 404  *
 405  * Returns: errno
 406  */
 407
 408 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 409 {
 410         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 411         struct gfs2_sbd *sdp = GFS2_SB(dir);
 412         struct gfs2_holder ghs[2];
 413         struct inode *inode;
 414         struct buffer_head *dibh;
 415         int error;
 416
 417         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 418
 419         inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
 420         if (IS_ERR(inode)) {
 421                 gfs2_holder_uninit(ghs);
 422                 return PTR_ERR(inode);
 423         }
 424
 425         ip = ghs[1].gh_gl->gl_object;
 426
 427         ip->i_inode.i_nlink = 2;
 428         ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
 429         ip->i_diskflags |= GFS2_DIF_JDATA;
 430         ip->i_entries = 2;
 431
 432         error = gfs2_meta_inode_buffer(ip, &dibh);
 433
 434         if (!gfs2_assert_withdraw(sdp, !error)) {
 435                 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 436                 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 437                 struct qstr str;
 438
 439                 gfs2_str2qstr(&str, ".");
 440                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 441                 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
 442                 dent->de_inum = di->di_num; /* already GFS2 endian */
 443                 dent->de_type = cpu_to_be16(DT_DIR);
 444                 di->di_entries = cpu_to_be32(1);
 445
 446                 gfs2_str2qstr(&str, "..");
 447                 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 448                 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 449
 450                 gfs2_inum_out(dip, dent);
 451                 dent->de_type = cpu_to_be16(DT_DIR);
 452
 453                 gfs2_dinode_out(ip, di);
 454
 455                 brelse(dibh);
 456         }
 457
 458         error = gfs2_change_nlink(dip, +1);
 459         gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 460
 461         gfs2_trans_end(sdp);
 462         if (dip->i_alloc->al_rgd)
 463                 gfs2_inplace_release(dip);
 464         gfs2_quota_unlock(dip);
 465         gfs2_alloc_put(dip);
 466
 467         gfs2_glock_dq_uninit_m(2, ghs);
 468
 469         d_instantiate(dentry, inode);
 470         mark_inode_dirty(inode);
 471
 472         return 0;
 473 }
 474
 475 /**
 476  * gfs2_rmdir - Remove a directory
 477  * @dir: The parent directory of the directory to be removed
 478  * @dentry: The dentry of the directory to remove
 479  *
 480  * Remove a directory. Call gfs2_rmdiri()
 481  *
 482  * Returns: errno
 483  */
 484
 485 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
 486 {
 487         struct gfs2_inode *dip = GFS2_I(dir);
 488         struct gfs2_sbd *sdp = GFS2_SB(dir);
 489         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 490         struct gfs2_holder ghs[3];
 491         struct gfs2_rgrpd *rgd;
 492         struct gfs2_holder ri_gh;
 493         int error;
 494
 495         error = gfs2_rindex_hold(sdp, &ri_gh);
 496         if (error)
 497                 return error;
 498         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 499         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 500
 501         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
 502         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
 503
 504         error = gfs2_glock_nq(ghs); /* parent */
 505         if (error)
 506                 goto out_parent;
 507
 508         error = gfs2_glock_nq(ghs + 1); /* child */
 509         if (error)
 510                 goto out_child;
 511
 512         error = gfs2_glock_nq(ghs + 2); /* rgrp */
 513         if (error)
 514                 goto out_rgrp;
 515
 516         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
 517         if (error)
 518                 goto out_gunlock;
 519
 520         if (ip->i_entries < 2) {
 521                 if (gfs2_consist_inode(ip))
 522                         gfs2_dinode_print(ip);
 523                 error = -EIO;
 524                 goto out_gunlock;
 525         }
 526         if (ip->i_entries > 2) {
 527                 error = -ENOTEMPTY;
 528                 goto out_gunlock;
 529         }
 530
 531         error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
 532         if (error)
 533                 goto out_gunlock;
 534
 535         error = gfs2_rmdiri(dip, &dentry->d_name, ip);
 536
 537         gfs2_trans_end(sdp);
 538
 539 out_gunlock:
 540         gfs2_glock_dq(ghs + 2);
 541 out_rgrp:
 542         gfs2_holder_uninit(ghs + 2);
 543         gfs2_glock_dq(ghs + 1);
 544 out_child:
 545         gfs2_holder_uninit(ghs + 1);
 546         gfs2_glock_dq(ghs);
 547 out_parent:
 548         gfs2_holder_uninit(ghs);
 549         gfs2_glock_dq_uninit(&ri_gh);
 550         return error;
 551 }
 552
 553 /**
 554  * gfs2_mknod - Make a special file
 555  * @dir: The directory in which the special file will reside
 556  * @dentry: The dentry of the special file
 557  * @mode: The mode of the special file
 558  * @rdev: The device specification of the special file
 559  *
 560  */
 561
 562 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 563                       dev_t dev)
 564 {
 565         struct gfs2_inode *dip = GFS2_I(dir);
 566         struct gfs2_sbd *sdp = GFS2_SB(dir);
 567         struct gfs2_holder ghs[2];
 568         struct inode *inode;
 569
 570         gfs2_holder_init(dip->i_gl, 0, 0, ghs);
 571
 572         inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
 573         if (IS_ERR(inode)) {
 574                 gfs2_holder_uninit(ghs);
 575                 return PTR_ERR(inode);
 576         }
 577
 578         gfs2_trans_end(sdp);
 579         if (dip->i_alloc->al_rgd)
 580                 gfs2_inplace_release(dip);
 581         gfs2_quota_unlock(dip);
 582         gfs2_alloc_put(dip);
 583
 584         gfs2_glock_dq_uninit_m(2, ghs);
 585
 586         d_instantiate(dentry, inode);
 587         mark_inode_dirty(inode);
 588
 589         return 0;
 590 }
 591
 592 /*
 593  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
 594  * @this: move this
 595  * @to: to here
 596  *
 597  * Follow @to back to the root and make sure we don't encounter @this
 598  * Assumes we already hold the rename lock.
 599  *
 600  * Returns: errno
 601  */
 602
 603 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
 604 {
 605         struct inode *dir = &to->i_inode;
 606         struct super_block *sb = dir->i_sb;
 607         struct inode *tmp;
 608         struct qstr dotdot;
 609         int error = 0;
 610
 611         gfs2_str2qstr(&dotdot, "..");
 612
 613         igrab(dir);
 614
 615         for (;;) {
 616                 if (dir == &this->i_inode) {
 617                         error = -EINVAL;
 618                         break;
 619                 }
 620                 if (dir == sb->s_root->d_inode) {
 621                         error = 0;
 622                         break;
 623                 }
 624
 625                 tmp = gfs2_lookupi(dir, &dotdot, 1);
 626                 if (IS_ERR(tmp)) {
 627                         error = PTR_ERR(tmp);
 628                         break;
 629                 }
 630
 631                 iput(dir);
 632                 dir = tmp;
 633         }
 634
 635         iput(dir);
 636
 637         return error;
 638 }
 639
 640 /**
 641  * gfs2_rename - Rename a file
 642  * @odir: Parent directory of old file name
 643  * @odentry: The old dentry of the file
 644  * @ndir: Parent directory of new file name
 645  * @ndentry: The new dentry of the file
 646  *
 647  * Returns: errno
 648  */
 649
 650 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 651                        struct inode *ndir, struct dentry *ndentry)
 652 {
 653         struct gfs2_inode *odip = GFS2_I(odir);
 654         struct gfs2_inode *ndip = GFS2_I(ndir);
 655         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
 656         struct gfs2_inode *nip = NULL;
 657         struct gfs2_sbd *sdp = GFS2_SB(odir);
 658         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
 659         struct gfs2_rgrpd *nrgd;
 660         unsigned int num_gh;
 661         int dir_rename = 0;
 662         int alloc_required;
 663         unsigned int x;
 664         int error;
 665
 666         if (ndentry->d_inode) {
 667                 nip = GFS2_I(ndentry->d_inode);
 668                 if (ip == nip)
 669                         return 0;
 670         }
 671
 672
 673         if (odip != ndip) {
 674                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
 675                                            0, &r_gh);
 676                 if (error)
 677                         goto out;
 678
 679                 if (S_ISDIR(ip->i_inode.i_mode)) {
 680                         dir_rename = 1;
 681                         /* don't move a dirctory into it's subdir */
 682                         error = gfs2_ok_to_move(ip, ndip);
 683                         if (error)
 684                                 goto out_gunlock_r;
 685                 }
 686         }
 687
 688         num_gh = 1;
 689         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 690         if (odip != ndip) {
 691                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 692                 num_gh++;
 693         }
 694         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 695         num_gh++;
 696
 697         if (nip) {
 698                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
 699                 num_gh++;
 700                 /* grab the resource lock for unlink flag twiddling
 701                  * this is the case of the target file already existing
 702                  * so we unlink before doing the rename
 703                  */
 704                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
 705                 if (nrgd)
 706                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
 707         }
 708
 709         for (x = 0; x < num_gh; x++) {
 710                 error = gfs2_glock_nq(ghs + x);
 711                 if (error)
 712                         goto out_gunlock;
 713         }
 714
 715         /* Check out the old directory */
 716
 717         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
 718         if (error)
 719                 goto out_gunlock;
 720
 721         /* Check out the new directory */
 722
 723         if (nip) {
 724                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
 725                 if (error)
 726                         goto out_gunlock;
 727
 728                 if (S_ISDIR(nip->i_inode.i_mode)) {
 729                         if (nip->i_entries < 2) {
 730                                 if (gfs2_consist_inode(nip))
 731                                         gfs2_dinode_print(nip);
 732                                 error = -EIO;
 733                                 goto out_gunlock;
 734                         }
 735                         if (nip->i_entries > 2) {
 736                                 error = -ENOTEMPTY;
 737                                 goto out_gunlock;
 738                         }
 739                 }
 740         } else {
 741                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
 742                 if (error)
 743                         goto out_gunlock;
 744
 745                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
 746                 switch (error) {
 747                 case -ENOENT:
 748                         error = 0;
 749                         break;
 750                 case 0:
 751                         error = -EEXIST;
 752                 default:
 753                         goto out_gunlock;
 754                 };
 755
 756                 if (odip != ndip) {
 757                         if (!ndip->i_inode.i_nlink) {
 758                                 error = -EINVAL;
 759                                 goto out_gunlock;
 760                         }
 761                         if (ndip->i_entries == (u32)-1) {
 762                                 error = -EFBIG;
 763                                 goto out_gunlock;
 764                         }
 765                         if (S_ISDIR(ip->i_inode.i_mode) &&
 766                             ndip->i_inode.i_nlink == (u32)-1) {
 767                                 error = -EMLINK;
 768                                 goto out_gunlock;
 769                         }
 770                 }
 771         }
 772
 773         /* Check out the dir to be renamed */
 774
 775         if (dir_rename) {
 776                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
 777                 if (error)
 778                         goto out_gunlock;
 779         }
 780
 781         alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
 782         if (error < 0)
 783                 goto out_gunlock;
 784         error = 0;
 785
 786         if (alloc_required) {
 787                 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
 788                 if (!al) {
 789                         error = -ENOMEM;
 790                         goto out_gunlock;
 791                 }
 792
 793                 error = gfs2_quota_lock_check(ndip);
 794                 if (error)
 795                         goto out_alloc;
 796
 797                 al->al_requested = sdp->sd_max_dirres;
 798
 799                 error = gfs2_inplace_reserve(ndip);
 800                 if (error)
 801                         goto out_gunlock_q;
 802
 803                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 804                                          al->al_rgd->rd_length +
 805                                          4 * RES_DINODE + 4 * RES_LEAF +
 806                                          RES_STATFS + RES_QUOTA + 4, 0);
 807                 if (error)
 808                         goto out_ipreserv;
 809         } else {
 810                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
 811                                          5 * RES_LEAF + 4, 0);
 812                 if (error)
 813                         goto out_gunlock;
 814         }
 815
 816         /* Remove the target file, if it exists */
 817
 818         if (nip) {
 819                 if (S_ISDIR(nip->i_inode.i_mode))
 820                         error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
 821                 else {
 822                         error = gfs2_dir_del(ndip, &ndentry->d_name);
 823                         if (error)
 824                                 goto out_end_trans;
 825                         error = gfs2_change_nlink(nip, -1);
 826                 }
 827                 if (error)
 828                         goto out_end_trans;
 829         }
 830
 831         if (dir_rename) {
 832                 struct qstr name;
 833                 gfs2_str2qstr(&name, "..");
 834
 835                 error = gfs2_change_nlink(ndip, +1);
 836                 if (error)
 837                         goto out_end_trans;
 838                 error = gfs2_change_nlink(odip, -1);
 839                 if (error)
 840                         goto out_end_trans;
 841
 842                 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
 843                 if (error)
 844                         goto out_end_trans;
 845         } else {
 846                 struct buffer_head *dibh;
 847                 error = gfs2_meta_inode_buffer(ip, &dibh);
 848                 if (error)
 849                         goto out_end_trans;
 850                 ip->i_inode.i_ctime = CURRENT_TIME;
 851                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 852                 gfs2_dinode_out(ip, dibh->b_data);
 853                 brelse(dibh);
 854         }
 855
 856         error = gfs2_dir_del(odip, &odentry->d_name);
 857         if (error)
 858                 goto out_end_trans;
 859
 860         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
 861         if (error)
 862                 goto out_end_trans;
 863
 864 out_end_trans:
 865         gfs2_trans_end(sdp);
 866 out_ipreserv:
 867         if (alloc_required)
 868                 gfs2_inplace_release(ndip);
 869 out_gunlock_q:
 870         if (alloc_required)
 871                 gfs2_quota_unlock(ndip);
 872 out_alloc:
 873         if (alloc_required)
 874                 gfs2_alloc_put(ndip);
 875 out_gunlock:
 876         while (x--) {
 877                 gfs2_glock_dq(ghs + x);
 878                 gfs2_holder_uninit(ghs + x);
 879         }
 880 out_gunlock_r:
 881         if (r_gh.gh_gl)
 882                 gfs2_glock_dq_uninit(&r_gh);
 883 out:
 884         return error;
 885 }
 886
 887 /**
 888  * gfs2_readlink - Read the value of a symlink
 889  * @dentry: the symlink
 890  * @buf: the buffer to read the symlink data into
 891  * @size: the size of the buffer
 892  *
 893  * Returns: errno
 894  */
 895
 896 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
 897                          int user_size)
 898 {
 899         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 900         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 901         unsigned int len = GFS2_FAST_NAME_SIZE;
 902         int error;
 903
 904         error = gfs2_readlinki(ip, &buf, &len);
 905         if (error)
 906                 return error;
 907
 908         if (user_size > len - 1)
 909                 user_size = len - 1;
 910
 911         if (copy_to_user(user_buf, buf, user_size))
 912                 error = -EFAULT;
 913         else
 914                 error = user_size;
 915
 916         if (buf != array)
 917                 kfree(buf);
 918
 919         return error;
 920 }
 921
 922 /**
 923  * gfs2_follow_link - Follow a symbolic link
 924  * @dentry: The dentry of the link
 925  * @nd: Data that we pass to vfs_follow_link()
 926  *
 927  * This can handle symlinks of any size. It is optimised for symlinks
 928  * under GFS2_FAST_NAME_SIZE.
 929  *
 930  * Returns: 0 on success or error code
 931  */
 932
 933 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
 934 {
 935         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
 936         char array[GFS2_FAST_NAME_SIZE], *buf = array;
 937         unsigned int len = GFS2_FAST_NAME_SIZE;
 938         int error;
 939
 940         error = gfs2_readlinki(ip, &buf, &len);
 941         if (!error) {
 942                 error = vfs_follow_link(nd, buf);
 943                 if (buf != array)
 944                         kfree(buf);
 945         }
 946
 947         return ERR_PTR(error);
 948 }
 949
 950 /**
 951  * gfs2_permission -
 952  * @inode:
 953  * @mask:
 954  * @nd: passed from Linux VFS, ignored by us
 955  *
 956  * This may be called from the VFS directly, or from within GFS2 with the
 957  * inode locked, so we look to see if the glock is already locked and only
 958  * lock the glock if its not already been done.
 959  *
 960  * Returns: errno
 961  */
 962
 963 int gfs2_permission(struct inode *inode, int mask)
 964 {
 965         struct gfs2_inode *ip = GFS2_I(inode);
 966         struct gfs2_holder i_gh;
 967         int error;
 968         int unlock = 0;
 969
 970         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
 971                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 972                 if (error)
 973                         return error;
 974                 unlock = 1;
 975         }
 976
 977         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
 978                 error = -EACCES;
 979         else
 980                 error = generic_permission(inode, mask, gfs2_check_acl);
 981         if (unlock)
 982                 gfs2_glock_dq_uninit(&i_gh);
 983
 984         return error;
 985 }
 986
 987 static int setattr_size(struct inode *inode, struct iattr *attr)
 988 {
 989         struct gfs2_inode *ip = GFS2_I(inode);
 990         struct gfs2_sbd *sdp = GFS2_SB(inode);
 991         int error;
 992
 993         if (attr->ia_size != ip->i_disksize) {
 994                 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
 995                 if (error)
 996                         return error;
 997                 error = vmtruncate(inode, attr->ia_size);
 998                 gfs2_trans_end(sdp);
 999                 if (error)
1000                         return error;
1001         }
1002
1003         error = gfs2_truncatei(ip, attr->ia_size);
1004         if (error && (inode->i_size != ip->i_disksize))
1005                 i_size_write(inode, ip->i_disksize);
1006
1007         return error;
1008 }
1009
1010 static int setattr_chown(struct inode *inode, struct iattr *attr)
1011 {
1012         struct gfs2_inode *ip = GFS2_I(inode);
1013         struct gfs2_sbd *sdp = GFS2_SB(inode);
1014         struct buffer_head *dibh;
1015         u32 ouid, ogid, nuid, ngid;
1016         int error;
1017
1018         ouid = inode->i_uid;
1019         ogid = inode->i_gid;
1020         nuid = attr->ia_uid;
1021         ngid = attr->ia_gid;
1022
1023         if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1024                 ouid = nuid = NO_QUOTA_CHANGE;
1025         if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1026                 ogid = ngid = NO_QUOTA_CHANGE;
1027
1028         if (!gfs2_alloc_get(ip))
1029                 return -ENOMEM;
1030
1031         error = gfs2_quota_lock(ip, nuid, ngid);
1032         if (error)
1033                 goto out_alloc;
1034
1035         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1036                 error = gfs2_quota_check(ip, nuid, ngid);
1037                 if (error)
1038                         goto out_gunlock_q;
1039         }
1040
1041         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1042         if (error)
1043                 goto out_gunlock_q;
1044
1045         error = gfs2_meta_inode_buffer(ip, &dibh);
1046         if (error)
1047                 goto out_end_trans;
1048
1049         error = inode_setattr(inode, attr);
1050         gfs2_assert_warn(sdp, !error);
1051
1052         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1053         gfs2_dinode_out(ip, dibh->b_data);
1054         brelse(dibh);
1055
1056         if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1057                 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1058                 gfs2_quota_change(ip, -blocks, ouid, ogid);
1059                 gfs2_quota_change(ip, blocks, nuid, ngid);
1060         }
1061
1062 out_end_trans:
1063         gfs2_trans_end(sdp);
1064 out_gunlock_q:
1065         gfs2_quota_unlock(ip);
1066 out_alloc:
1067         gfs2_alloc_put(ip);
1068         return error;
1069 }
1070
1071 /**
1072  * gfs2_setattr - Change attributes on an inode
1073  * @dentry: The dentry which is changing
1074  * @attr: The structure describing the change
1075  *
1076  * The VFS layer wants to change one or more of an inodes attributes.  Write
1077  * that change out to disk.
1078  *
1079  * Returns: errno
1080  */
1081
1082 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1083 {
1084         struct inode *inode = dentry->d_inode;
1085         struct gfs2_inode *ip = GFS2_I(inode);
1086         struct gfs2_holder i_gh;
1087         int error;
1088
1089         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1090         if (error)
1091                 return error;
1092
1093         error = -EPERM;
1094         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1095                 goto out;
1096
1097         error = inode_change_ok(inode, attr);
1098         if (error)
1099                 goto out;
1100
1101         if (attr->ia_valid & ATTR_SIZE)
1102                 error = setattr_size(inode, attr);
1103         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1104                 error = setattr_chown(inode, attr);
1105         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1106                 error = gfs2_acl_chmod(ip, attr);
1107         else
1108                 error = gfs2_setattr_simple(ip, attr);
1109
1110 out:
1111         gfs2_glock_dq_uninit(&i_gh);
1112         if (!error)
1113                 mark_inode_dirty(inode);
1114         return error;
1115 }
1116
1117 /**
1118  * gfs2_getattr - Read out an inode's attributes
1119  * @mnt: The vfsmount the inode is being accessed from
1120  * @dentry: The dentry to stat
1121  * @stat: The inode's stats
1122  *
1123  * This may be called from the VFS directly, or from within GFS2 with the
1124  * inode locked, so we look to see if the glock is already locked and only
1125  * lock the glock if its not already been done. Note that its the NFS
1126  * readdirplus operation which causes this to be called (from filldir)
1127  * with the glock already held.
1128  *
1129  * Returns: errno
1130  */
1131
1132 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1133                         struct kstat *stat)
1134 {
1135         struct inode *inode = dentry->d_inode;
1136         struct gfs2_inode *ip = GFS2_I(inode);
1137         struct gfs2_holder gh;
1138         int error;
1139         int unlock = 0;
1140
1141         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1142                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1143                 if (error)
1144                         return error;
1145                 unlock = 1;
1146         }
1147
1148         generic_fillattr(inode, stat);
1149         if (unlock)
1150                 gfs2_glock_dq_uninit(&gh);
1151
1152         return 0;
1153 }
1154
1155 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1156                          const void *data, size_t size, int flags)
1157 {
1158         struct inode *inode = dentry->d_inode;
1159         struct gfs2_ea_request er;
1160
1161         memset(&er, 0, sizeof(struct gfs2_ea_request));
1162         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1163         if (er.er_type == GFS2_EATYPE_UNUSED)
1164                 return -EOPNOTSUPP;
1165         er.er_data = (char *)data;
1166         er.er_name_len = strlen(er.er_name);
1167         er.er_data_len = size;
1168         er.er_flags = flags;
1169
1170         gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1171
1172         return gfs2_ea_set(GFS2_I(inode), &er);
1173 }
1174
1175 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1176                              void *data, size_t size)
1177 {
1178         struct gfs2_ea_request er;
1179
1180         memset(&er, 0, sizeof(struct gfs2_ea_request));
1181         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1182         if (er.er_type == GFS2_EATYPE_UNUSED)
1183                 return -EOPNOTSUPP;
1184         er.er_data = data;
1185         er.er_name_len = strlen(er.er_name);
1186         er.er_data_len = size;
1187
1188         return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1189 }
1190
1191 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1192 {
1193         struct gfs2_ea_request er;
1194
1195         memset(&er, 0, sizeof(struct gfs2_ea_request));
1196         er.er_data = (size) ? buffer : NULL;
1197         er.er_data_len = size;
1198
1199         return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1200 }
1201
1202 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1203 {
1204         struct gfs2_ea_request er;
1205
1206         memset(&er, 0, sizeof(struct gfs2_ea_request));
1207         er.er_type = gfs2_ea_name2type(name, &er.er_name);
1208         if (er.er_type == GFS2_EATYPE_UNUSED)
1209                 return -EOPNOTSUPP;
1210         er.er_name_len = strlen(er.er_name);
1211
1212         return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1213 }
1214
1215 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1216                        u64 start, u64 len)
1217 {
1218         struct gfs2_inode *ip = GFS2_I(inode);
1219         struct gfs2_holder gh;
1220         int ret;
1221
1222         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1223         if (ret)
1224                 return ret;
1225
1226         mutex_lock(&inode->i_mutex);
1227
1228         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1229         if (ret)
1230                 goto out;
1231
1232         if (gfs2_is_stuffed(ip)) {
1233                 u64 phys = ip->i_no_addr << inode->i_blkbits;
1234                 u64 size = i_size_read(inode);
1235                 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1236                             FIEMAP_EXTENT_DATA_INLINE;
1237                 phys += sizeof(struct gfs2_dinode);
1238                 phys += start;
1239                 if (start + len > size)
1240                         len = size - start;
1241                 if (start < size)
1242                         ret = fiemap_fill_next_extent(fieinfo, start, phys,
1243                                                       len, flags);
1244                 if (ret == 1)
1245                         ret = 0;
1246         } else {
1247                 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1248                                              gfs2_block_map);
1249         }
1250
1251         gfs2_glock_dq_uninit(&gh);
1252 out:
1253         mutex_unlock(&inode->i_mutex);
1254         return ret;
1255 }
1256
1257 const struct inode_operations gfs2_file_iops = {
1258         .permission = gfs2_permission,
1259         .setattr = gfs2_setattr,
1260         .getattr = gfs2_getattr,
1261         .setxattr = gfs2_setxattr,
1262         .getxattr = gfs2_getxattr,
1263         .listxattr = gfs2_listxattr,
1264         .removexattr = gfs2_removexattr,
1265         .fiemap = gfs2_fiemap,
1266 };
1267
1268 const struct inode_operations gfs2_dir_iops = {
1269         .create = gfs2_create,
1270         .lookup = gfs2_lookup,
1271         .link = gfs2_link,
1272         .unlink = gfs2_unlink,
1273         .symlink = gfs2_symlink,
1274         .mkdir = gfs2_mkdir,
1275         .rmdir = gfs2_rmdir,
1276         .mknod = gfs2_mknod,
1277         .rename = gfs2_rename,
1278         .permission = gfs2_permission,
1279         .setattr = gfs2_setattr,
1280         .getattr = gfs2_getattr,
1281         .setxattr = gfs2_setxattr,
1282         .getxattr = gfs2_getxattr,
1283         .listxattr = gfs2_listxattr,
1284         .removexattr = gfs2_removexattr,
1285         .fiemap = gfs2_fiemap,
1286 };
1287
1288 const struct inode_operations gfs2_symlink_iops = {
1289         .readlink = gfs2_readlink,
1290         .follow_link = gfs2_follow_link,
1291         .permission = gfs2_permission,
1292         .setattr = gfs2_setattr,
1293         .getattr = gfs2_getattr,
1294         .setxattr = gfs2_setxattr,
1295         .getxattr = gfs2_getxattr,
1296         .listxattr = gfs2_listxattr,
1297         .removexattr = gfs2_removexattr,
1298         .fiemap = gfs2_fiemap,
1299 };
1300