fs/gfs2/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/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/posix_acl.h>
  16 #include <linux/sort.h>
  17 #include <linux/gfs2_ondisk.h>
  18 #include <linux/crc32.h>
  19 #include <linux/lm_interface.h>
  20 #include <linux/security.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "acl.h"
  25 #include "bmap.h"
  26 #include "dir.h"
  27 #include "eattr.h"
  28 #include "glock.h"
  29 #include "glops.h"
  30 #include "inode.h"
  31 #include "log.h"
  32 #include "meta_io.h"
  33 #include "ops_address.h"
  34 #include "ops_file.h"
  35 #include "ops_inode.h"
  36 #include "quota.h"
  37 #include "rgrp.h"
  38 #include "trans.h"
  39 #include "util.h"
  40
  41 static int iget_test(struct inode *inode, void *opaque)
  42 {
  43         struct gfs2_inode *ip = GFS2_I(inode);
  44         struct gfs2_inum_host *inum = opaque;
  45
  46         if (ip->i_num.no_addr == inum->no_addr &&
  47             inode->i_private != NULL)
  48                 return 1;
  49
  50         return 0;
  51 }
  52
  53 static int iget_set(struct inode *inode, void *opaque)
  54 {
  55         struct gfs2_inode *ip = GFS2_I(inode);
  56         struct gfs2_inum_host *inum = opaque;
  57
  58         ip->i_num = *inum;
  59         inode->i_ino = inum->no_addr;
  60         return 0;
  61 }
  62
  63 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
  64 {
  65         return ilookup5(sb, (unsigned long)inum->no_addr,
  66                         iget_test, inum);
  67 }
  68
  69 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
  70 {
  71         return iget5_locked(sb, (unsigned long)inum->no_addr,
  72                      iget_test, iget_set, inum);
  73 }
  74
  75 /**
  76  * gfs2_inode_lookup - Lookup an inode
  77  * @sb: The super block
  78  * @inum: The inode number
  79  * @type: The type of the inode
  80  *
  81  * Returns: A VFS inode, or an error
  82  */
  83
  84 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
  85 {
  86         struct inode *inode = gfs2_iget(sb, inum);
  87         struct gfs2_inode *ip = GFS2_I(inode);
  88         struct gfs2_glock *io_gl;
  89         int error;
  90
  91         if (!inode)
  92                 return ERR_PTR(-ENOBUFS);
  93
  94         if (inode->i_state & I_NEW) {
  95                 struct gfs2_sbd *sdp = GFS2_SB(inode);
  96                 umode_t mode = DT2IF(type);
  97                 inode->i_private = ip;
  98                 inode->i_mode = mode;
  99
 100                 if (S_ISREG(mode)) {
 101                         inode->i_op = &gfs2_file_iops;
 102                         inode->i_fop = &gfs2_file_fops;
 103                         inode->i_mapping->a_ops = &gfs2_file_aops;
 104                 } else if (S_ISDIR(mode)) {
 105                         inode->i_op = &gfs2_dir_iops;
 106                         inode->i_fop = &gfs2_dir_fops;
 107                 } else if (S_ISLNK(mode)) {
 108                         inode->i_op = &gfs2_symlink_iops;
 109                 } else {
 110                         inode->i_op = &gfs2_dev_iops;
 111                 }
 112
 113                 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 114                 if (unlikely(error))
 115                         goto fail;
 116                 ip->i_gl->gl_object = ip;
 117
 118                 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 119                 if (unlikely(error))
 120                         goto fail_put;
 121
 122                 set_bit(GIF_INVALID, &ip->i_flags);
 123                 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 124                 if (unlikely(error))
 125                         goto fail_iopen;
 126
 127                 gfs2_glock_put(io_gl);
 128                 unlock_new_inode(inode);
 129         }
 130
 131         return inode;
 132 fail_iopen:
 133         gfs2_glock_put(io_gl);
 134 fail_put:
 135         ip->i_gl->gl_object = NULL;
 136         gfs2_glock_put(ip->i_gl);
 137 fail:
 138         iput(inode);
 139         return ERR_PTR(error);
 140 }
 141
 142 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 143 {
 144         struct gfs2_dinode_host *di = &ip->i_di;
 145         const struct gfs2_dinode *str = buf;
 146
 147         if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
 148                 if (gfs2_consist_inode(ip))
 149                         gfs2_dinode_print(ip);
 150                 return -EIO;
 151         }
 152         if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
 153                 return -ESTALE;
 154
 155         ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
 156         ip->i_inode.i_rdev = 0;
 157         switch (ip->i_inode.i_mode & S_IFMT) {
 158         case S_IFBLK:
 159         case S_IFCHR:
 160                 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
 161                                            be32_to_cpu(str->di_minor));
 162                 break;
 163         };
 164
 165         ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
 166         ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
 167         /*
 168          * We will need to review setting the nlink count here in the
 169          * light of the forthcoming ro bind mount work. This is a reminder
 170          * to do that.
 171          */
 172         ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
 173         di->di_size = be64_to_cpu(str->di_size);
 174         i_size_write(&ip->i_inode, di->di_size);
 175         di->di_blocks = be64_to_cpu(str->di_blocks);
 176         gfs2_set_inode_blocks(&ip->i_inode);
 177         ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
 178         ip->i_inode.i_atime.tv_nsec = 0;
 179         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
 180         ip->i_inode.i_mtime.tv_nsec = 0;
 181         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
 182         ip->i_inode.i_ctime.tv_nsec = 0;
 183
 184         di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
 185         di->di_goal_data = be64_to_cpu(str->di_goal_data);
 186         di->di_generation = be64_to_cpu(str->di_generation);
 187
 188         di->di_flags = be32_to_cpu(str->di_flags);
 189         gfs2_set_inode_flags(&ip->i_inode);
 190         di->di_height = be16_to_cpu(str->di_height);
 191
 192         di->di_depth = be16_to_cpu(str->di_depth);
 193         di->di_entries = be32_to_cpu(str->di_entries);
 194
 195         di->di_eattr = be64_to_cpu(str->di_eattr);
 196         return 0;
 197 }
 198
 199 /**
 200  * gfs2_inode_refresh - Refresh the incore copy of the dinode
 201  * @ip: The GFS2 inode
 202  *
 203  * Returns: errno
 204  */
 205
 206 int gfs2_inode_refresh(struct gfs2_inode *ip)
 207 {
 208         struct buffer_head *dibh;
 209         int error;
 210
 211         error = gfs2_meta_inode_buffer(ip, &dibh);
 212         if (error)
 213                 return error;
 214
 215         if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
 216                 brelse(dibh);
 217                 return -EIO;
 218         }
 219
 220         error = gfs2_dinode_in(ip, dibh->b_data);
 221         brelse(dibh);
 222         clear_bit(GIF_INVALID, &ip->i_flags);
 223
 224         return error;
 225 }
 226
 227 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
 228 {
 229         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230         struct gfs2_alloc *al;
 231         struct gfs2_rgrpd *rgd;
 232         int error;
 233
 234         if (ip->i_di.di_blocks != 1) {
 235                 if (gfs2_consist_inode(ip))
 236                         gfs2_dinode_print(ip);
 237                 return -EIO;
 238         }
 239
 240         al = gfs2_alloc_get(ip);
 241
 242         error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 243         if (error)
 244                 goto out;
 245
 246         error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
 247         if (error)
 248                 goto out_qs;
 249
 250         rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
 251         if (!rgd) {
 252                 gfs2_consist_inode(ip);
 253                 error = -EIO;
 254                 goto out_rindex_relse;
 255         }
 256
 257         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
 258                                    &al->al_rgd_gh);
 259         if (error)
 260                 goto out_rindex_relse;
 261
 262         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
 263         if (error)
 264                 goto out_rg_gunlock;
 265
 266         gfs2_trans_add_gl(ip->i_gl);
 267
 268         gfs2_free_di(rgd, ip);
 269
 270         gfs2_trans_end(sdp);
 271         clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 272
 273 out_rg_gunlock:
 274         gfs2_glock_dq_uninit(&al->al_rgd_gh);
 275 out_rindex_relse:
 276         gfs2_glock_dq_uninit(&al->al_ri_gh);
 277 out_qs:
 278         gfs2_quota_unhold(ip);
 279 out:
 280         gfs2_alloc_put(ip);
 281         return error;
 282 }
 283
 284 /**
 285  * gfs2_change_nlink - Change nlink count on inode
 286  * @ip: The GFS2 inode
 287  * @diff: The change in the nlink count required
 288  *
 289  * Returns: errno
 290  */
 291 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
 292 {
 293         struct buffer_head *dibh;
 294         u32 nlink;
 295         int error;
 296
 297         BUG_ON(diff != 1 && diff != -1);
 298         nlink = ip->i_inode.i_nlink + diff;
 299
 300         /* If we are reducing the nlink count, but the new value ends up being
 301            bigger than the old one, we must have underflowed. */
 302         if (diff < 0 && nlink > ip->i_inode.i_nlink) {
 303                 if (gfs2_consist_inode(ip))
 304                         gfs2_dinode_print(ip);
 305                 return -EIO;
 306         }
 307
 308         error = gfs2_meta_inode_buffer(ip, &dibh);
 309         if (error)
 310                 return error;
 311
 312         if (diff > 0)
 313                 inc_nlink(&ip->i_inode);
 314         else
 315                 drop_nlink(&ip->i_inode);
 316
 317         ip->i_inode.i_ctime = CURRENT_TIME_SEC;
 318
 319         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 320         gfs2_dinode_out(ip, dibh->b_data);
 321         brelse(dibh);
 322         mark_inode_dirty(&ip->i_inode);
 323
 324         if (ip->i_inode.i_nlink == 0)
 325                 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
 326
 327         return error;
 328 }
 329
 330 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
 331 {
 332         struct qstr qstr;
 333         struct inode *inode;
 334         gfs2_str2qstr(&qstr, name);
 335         inode = gfs2_lookupi(dip, &qstr, 1, NULL);
 336         /* gfs2_lookupi has inconsistent callers: vfs
 337          * related routines expect NULL for no entry found,
 338          * gfs2_lookup_simple callers expect ENOENT
 339          * and do not check for NULL.
 340          */
 341         if (inode == NULL)
 342                 return ERR_PTR(-ENOENT);
 343         else
 344                 return inode;
 345 }
 346
 347
 348 /**
 349  * gfs2_lookupi - Look up a filename in a directory and return its inode
 350  * @d_gh: An initialized holder for the directory glock
 351  * @name: The name of the inode to look for
 352  * @is_root: If 1, ignore the caller's permissions
 353  * @i_gh: An uninitialized holder for the new inode glock
 354  *
 355  * This can be called via the VFS filldir function when NFS is doing
 356  * a readdirplus and the inode which its intending to stat isn't
 357  * already in cache. In this case we must not take the directory glock
 358  * again, since the readdir call will have already taken that lock.
 359  *
 360  * Returns: errno
 361  */
 362
 363 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 364                            int is_root, struct nameidata *nd)
 365 {
 366         struct super_block *sb = dir->i_sb;
 367         struct gfs2_inode *dip = GFS2_I(dir);
 368         struct gfs2_holder d_gh;
 369         struct gfs2_inum_host inum;
 370         unsigned int type;
 371         int error;
 372         struct inode *inode = NULL;
 373         int unlock = 0;
 374
 375         if (!name->len || name->len > GFS2_FNAMESIZE)
 376                 return ERR_PTR(-ENAMETOOLONG);
 377
 378         if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
 379             (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
 380              dir == sb->s_root->d_inode)) {
 381                 igrab(dir);
 382                 return dir;
 383         }
 384
 385         if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) {
 386                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
 387                 if (error)
 388                         return ERR_PTR(error);
 389                 unlock = 1;
 390         }
 391
 392         if (!is_root) {
 393                 error = permission(dir, MAY_EXEC, NULL);
 394                 if (error)
 395                         goto out;
 396         }
 397
 398         error = gfs2_dir_search(dir, name, &inum, &type);
 399         if (error)
 400                 goto out;
 401
 402         inode = gfs2_inode_lookup(sb, &inum, type);
 403
 404 out:
 405         if (unlock)
 406                 gfs2_glock_dq_uninit(&d_gh);
 407         if (error == -ENOENT)
 408                 return NULL;
 409         return inode ? inode : ERR_PTR(error);
 410 }
 411
 412 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
 413 {
 414         struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
 415         struct buffer_head *bh;
 416         struct gfs2_inum_range_host ir;
 417         int error;
 418
 419         error = gfs2_trans_begin(sdp, RES_DINODE, 0);
 420         if (error)
 421                 return error;
 422         mutex_lock(&sdp->sd_inum_mutex);
 423
 424         error = gfs2_meta_inode_buffer(ip, &bh);
 425         if (error) {
 426                 mutex_unlock(&sdp->sd_inum_mutex);
 427                 gfs2_trans_end(sdp);
 428                 return error;
 429         }
 430
 431         gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
 432
 433         if (ir.ir_length) {
 434                 *formal_ino = ir.ir_start++;
 435                 ir.ir_length--;
 436                 gfs2_trans_add_bh(ip->i_gl, bh, 1);
 437                 gfs2_inum_range_out(&ir,
 438                                     bh->b_data + sizeof(struct gfs2_dinode));
 439                 brelse(bh);
 440                 mutex_unlock(&sdp->sd_inum_mutex);
 441                 gfs2_trans_end(sdp);
 442                 return 0;
 443         }
 444
 445         brelse(bh);
 446
 447         mutex_unlock(&sdp->sd_inum_mutex);
 448         gfs2_trans_end(sdp);
 449
 450         return 1;
 451 }
 452
 453 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
 454 {
 455         struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
 456         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
 457         struct gfs2_holder gh;
 458         struct buffer_head *bh;
 459         struct gfs2_inum_range_host ir;
 460         int error;
 461
 462         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 463         if (error)
 464                 return error;
 465
 466         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 467         if (error)
 468                 goto out;
 469         mutex_lock(&sdp->sd_inum_mutex);
 470
 471         error = gfs2_meta_inode_buffer(ip, &bh);
 472         if (error)
 473                 goto out_end_trans;
 474
 475         gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
 476
 477         if (!ir.ir_length) {
 478                 struct buffer_head *m_bh;
 479                 u64 x, y;
 480                 __be64 z;
 481
 482                 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 483                 if (error)
 484                         goto out_brelse;
 485
 486                 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
 487                 x = y = be64_to_cpu(z);
 488                 ir.ir_start = x;
 489                 ir.ir_length = GFS2_INUM_QUANTUM;
 490                 x += GFS2_INUM_QUANTUM;
 491                 if (x < y)
 492                         gfs2_consist_inode(m_ip);
 493                 z = cpu_to_be64(x);
 494                 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
 495                 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
 496
 497                 brelse(m_bh);
 498         }
 499
 500         *formal_ino = ir.ir_start++;
 501         ir.ir_length--;
 502
 503         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 504         gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
 505
 506 out_brelse:
 507         brelse(bh);
 508 out_end_trans:
 509         mutex_unlock(&sdp->sd_inum_mutex);
 510         gfs2_trans_end(sdp);
 511 out:
 512         gfs2_glock_dq_uninit(&gh);
 513         return error;
 514 }
 515
 516 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
 517 {
 518         int error;
 519
 520         error = pick_formal_ino_1(sdp, inum);
 521         if (error <= 0)
 522                 return error;
 523
 524         error = pick_formal_ino_2(sdp, inum);
 525
 526         return error;
 527 }
 528
 529 /**
 530  * create_ok - OK to create a new on-disk inode here?
 531  * @dip:  Directory in which dinode is to be created
 532  * @name:  Name of new dinode
 533  * @mode:
 534  *
 535  * Returns: errno
 536  */
 537
 538 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 539                      unsigned int mode)
 540 {
 541         int error;
 542
 543         error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
 544         if (error)
 545                 return error;
 546
 547         /*  Don't create entries in an unlinked directory  */
 548         if (!dip->i_inode.i_nlink)
 549                 return -EPERM;
 550
 551         error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
 552         switch (error) {
 553         case -ENOENT:
 554                 error = 0;
 555                 break;
 556         case 0:
 557                 return -EEXIST;
 558         default:
 559                 return error;
 560         }
 561
 562         if (dip->i_di.di_entries == (u32)-1)
 563                 return -EFBIG;
 564         if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
 565                 return -EMLINK;
 566
 567         return 0;
 568 }
 569
 570 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
 571                                unsigned int *uid, unsigned int *gid)
 572 {
 573         if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
 574             (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
 575                 if (S_ISDIR(*mode))
 576                         *mode |= S_ISUID;
 577                 else if (dip->i_inode.i_uid != current->fsuid)
 578                         *mode &= ~07111;
 579                 *uid = dip->i_inode.i_uid;
 580         } else
 581                 *uid = current->fsuid;
 582
 583         if (dip->i_inode.i_mode & S_ISGID) {
 584                 if (S_ISDIR(*mode))
 585                         *mode |= S_ISGID;
 586                 *gid = dip->i_inode.i_gid;
 587         } else
 588                 *gid = current->fsgid;
 589 }
 590
 591 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
 592                         u64 *generation)
 593 {
 594         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 595         int error;
 596
 597         gfs2_alloc_get(dip);
 598
 599         dip->i_alloc.al_requested = RES_DINODE;
 600         error = gfs2_inplace_reserve(dip);
 601         if (error)
 602                 goto out;
 603
 604         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
 605         if (error)
 606                 goto out_ipreserv;
 607
 608         inum->no_addr = gfs2_alloc_di(dip, generation);
 609
 610         gfs2_trans_end(sdp);
 611
 612 out_ipreserv:
 613         gfs2_inplace_release(dip);
 614 out:
 615         gfs2_alloc_put(dip);
 616         return error;
 617 }
 618
 619 /**
 620  * init_dinode - Fill in a new dinode structure
 621  * @dip: the directory this inode is being created in
 622  * @gl: The glock covering the new inode
 623  * @inum: the inode number
 624  * @mode: the file permissions
 625  * @uid:
 626  * @gid:
 627  *
 628  */
 629
 630 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
 631                         const struct gfs2_inum_host *inum, unsigned int mode,
 632                         unsigned int uid, unsigned int gid,
 633                         const u64 *generation, dev_t dev)
 634 {
 635         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 636         struct gfs2_dinode *di;
 637         struct buffer_head *dibh;
 638
 639         dibh = gfs2_meta_new(gl, inum->no_addr);
 640         gfs2_trans_add_bh(gl, dibh, 1);
 641         gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
 642         gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 643         di = (struct gfs2_dinode *)dibh->b_data;
 644
 645         di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
 646         di->di_num.no_addr = cpu_to_be64(inum->no_addr);
 647         di->di_mode = cpu_to_be32(mode);
 648         di->di_uid = cpu_to_be32(uid);
 649         di->di_gid = cpu_to_be32(gid);
 650         di->di_nlink = 0;
 651         di->di_size = 0;
 652         di->di_blocks = cpu_to_be64(1);
 653         di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
 654         di->di_major = cpu_to_be32(MAJOR(dev));
 655         di->di_minor = cpu_to_be32(MINOR(dev));
 656         di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
 657         di->di_generation = cpu_to_be64(*generation);
 658         di->di_flags = 0;
 659
 660         if (S_ISREG(mode)) {
 661                 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
 662                     gfs2_tune_get(sdp, gt_new_files_jdata))
 663                         di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
 664                 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
 665                     gfs2_tune_get(sdp, gt_new_files_directio))
 666                         di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
 667         } else if (S_ISDIR(mode)) {
 668                 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
 669                                             GFS2_DIF_INHERIT_DIRECTIO);
 670                 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
 671                                             GFS2_DIF_INHERIT_JDATA);
 672         }
 673
 674         di->__pad1 = 0;
 675         di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
 676         di->di_height = 0;
 677         di->__pad2 = 0;
 678         di->__pad3 = 0;
 679         di->di_depth = 0;
 680         di->di_entries = 0;
 681         memset(&di->__pad4, 0, sizeof(di->__pad4));
 682         di->di_eattr = 0;
 683         memset(&di->di_reserved, 0, sizeof(di->di_reserved));
 684
 685         brelse(dibh);
 686 }
 687
 688 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
 689                        unsigned int mode, const struct gfs2_inum_host *inum,
 690                        const u64 *generation, dev_t dev)
 691 {
 692         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 693         unsigned int uid, gid;
 694         int error;
 695
 696         munge_mode_uid_gid(dip, &mode, &uid, &gid);
 697         gfs2_alloc_get(dip);
 698
 699         error = gfs2_quota_lock(dip, uid, gid);
 700         if (error)
 701                 goto out;
 702
 703         error = gfs2_quota_check(dip, uid, gid);
 704         if (error)
 705                 goto out_quota;
 706
 707         error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
 708         if (error)
 709                 goto out_quota;
 710
 711         init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
 712         gfs2_quota_change(dip, +1, uid, gid);
 713         gfs2_trans_end(sdp);
 714
 715 out_quota:
 716         gfs2_quota_unlock(dip);
 717 out:
 718         gfs2_alloc_put(dip);
 719         return error;
 720 }
 721
 722 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
 723                        struct gfs2_inode *ip)
 724 {
 725         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 726         struct gfs2_alloc *al;
 727         int alloc_required;
 728         struct buffer_head *dibh;
 729         int error;
 730
 731         al = gfs2_alloc_get(dip);
 732
 733         error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 734         if (error)
 735                 goto fail;
 736
 737         error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
 738         if (alloc_required < 0)
 739                 goto fail;
 740         if (alloc_required) {
 741                 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
 742                 if (error)
 743                         goto fail_quota_locks;
 744
 745                 al->al_requested = sdp->sd_max_dirres;
 746
 747                 error = gfs2_inplace_reserve(dip);
 748                 if (error)
 749                         goto fail_quota_locks;
 750
 751                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
 752                                          al->al_rgd->rd_ri.ri_length +
 753                                          2 * RES_DINODE +
 754                                          RES_STATFS + RES_QUOTA, 0);
 755                 if (error)
 756                         goto fail_ipreserv;
 757         } else {
 758                 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
 759                 if (error)
 760                         goto fail_quota_locks;
 761         }
 762
 763         error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode));
 764         if (error)
 765                 goto fail_end_trans;
 766
 767         error = gfs2_meta_inode_buffer(ip, &dibh);
 768         if (error)
 769                 goto fail_end_trans;
 770         ip->i_inode.i_nlink = 1;
 771         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 772         gfs2_dinode_out(ip, dibh->b_data);
 773         brelse(dibh);
 774         return 0;
 775
 776 fail_end_trans:
 777         gfs2_trans_end(sdp);
 778
 779 fail_ipreserv:
 780         if (dip->i_alloc.al_rgd)
 781                 gfs2_inplace_release(dip);
 782
 783 fail_quota_locks:
 784         gfs2_quota_unlock(dip);
 785
 786 fail:
 787         gfs2_alloc_put(dip);
 788         return error;
 789 }
 790
 791 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
 792 {
 793         int err;
 794         size_t len;
 795         void *value;
 796         char *name;
 797         struct gfs2_ea_request er;
 798
 799         err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
 800                                            &name, &value, &len);
 801
 802         if (err) {
 803                 if (err == -EOPNOTSUPP)
 804                         return 0;
 805                 return err;
 806         }
 807
 808         memset(&er, 0, sizeof(struct gfs2_ea_request));
 809
 810         er.er_type = GFS2_EATYPE_SECURITY;
 811         er.er_name = name;
 812         er.er_data = value;
 813         er.er_name_len = strlen(name);
 814         er.er_data_len = len;
 815
 816         err = gfs2_ea_set_i(ip, &er);
 817
 818         kfree(value);
 819         kfree(name);
 820
 821         return err;
 822 }
 823
 824 /**
 825  * gfs2_createi - Create a new inode
 826  * @ghs: An array of two holders
 827  * @name: The name of the new file
 828  * @mode: the permissions on the new inode
 829  *
 830  * @ghs[0] is an initialized holder for the directory
 831  * @ghs[1] is the holder for the inode lock
 832  *
 833  * If the return value is not NULL, the glocks on both the directory and the new
 834  * file are held.  A transaction has been started and an inplace reservation
 835  * is held, as well.
 836  *
 837  * Returns: An inode
 838  */
 839
 840 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
 841                            unsigned int mode, dev_t dev)
 842 {
 843         struct inode *inode;
 844         struct gfs2_inode *dip = ghs->gh_gl->gl_object;
 845         struct inode *dir = &dip->i_inode;
 846         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 847         struct gfs2_inum_host inum;
 848         int error;
 849         u64 generation;
 850
 851         if (!name->len || name->len > GFS2_FNAMESIZE)
 852                 return ERR_PTR(-ENAMETOOLONG);
 853
 854         gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
 855         error = gfs2_glock_nq(ghs);
 856         if (error)
 857                 goto fail;
 858
 859         error = create_ok(dip, name, mode);
 860         if (error)
 861                 goto fail_gunlock;
 862
 863         error = pick_formal_ino(sdp, &inum.no_formal_ino);
 864         if (error)
 865                 goto fail_gunlock;
 866
 867         error = alloc_dinode(dip, &inum, &generation);
 868         if (error)
 869                 goto fail_gunlock;
 870
 871         error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
 872                                   LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
 873         if (error)
 874                 goto fail_gunlock;
 875
 876         error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
 877         if (error)
 878                 goto fail_gunlock2;
 879
 880         inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
 881         if (IS_ERR(inode))
 882                 goto fail_gunlock2;
 883
 884         error = gfs2_inode_refresh(GFS2_I(inode));
 885         if (error)
 886                 goto fail_iput;
 887
 888         error = gfs2_acl_create(dip, GFS2_I(inode));
 889         if (error)
 890                 goto fail_iput;
 891
 892         error = gfs2_security_init(dip, GFS2_I(inode));
 893         if (error)
 894                 goto fail_iput;
 895
 896         error = link_dinode(dip, name, GFS2_I(inode));
 897         if (error)
 898                 goto fail_iput;
 899
 900         if (!inode)
 901                 return ERR_PTR(-ENOMEM);
 902         return inode;
 903
 904 fail_iput:
 905         iput(inode);
 906 fail_gunlock2:
 907         gfs2_glock_dq_uninit(ghs + 1);
 908 fail_gunlock:
 909         gfs2_glock_dq(ghs);
 910 fail:
 911         return ERR_PTR(error);
 912 }
 913
 914 /**
 915  * gfs2_rmdiri - Remove a directory
 916  * @dip: The parent directory of the directory to be removed
 917  * @name: The name of the directory to be removed
 918  * @ip: The GFS2 inode of the directory to be removed
 919  *
 920  * Assumes Glocks on dip and ip are held
 921  *
 922  * Returns: errno
 923  */
 924
 925 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
 926                 struct gfs2_inode *ip)
 927 {
 928         struct qstr dotname;
 929         int error;
 930
 931         if (ip->i_di.di_entries != 2) {
 932                 if (gfs2_consist_inode(ip))
 933                         gfs2_dinode_print(ip);
 934                 return -EIO;
 935         }
 936
 937         error = gfs2_dir_del(dip, name);
 938         if (error)
 939                 return error;
 940
 941         error = gfs2_change_nlink(dip, -1);
 942         if (error)
 943                 return error;
 944
 945         gfs2_str2qstr(&dotname, ".");
 946         error = gfs2_dir_del(ip, &dotname);
 947         if (error)
 948                 return error;
 949
 950         gfs2_str2qstr(&dotname, "..");
 951         error = gfs2_dir_del(ip, &dotname);
 952         if (error)
 953                 return error;
 954
 955         /* It looks odd, but it really should be done twice */
 956         error = gfs2_change_nlink(ip, -1);
 957         if (error)
 958                 return error;
 959
 960         error = gfs2_change_nlink(ip, -1);
 961         if (error)
 962                 return error;
 963
 964         return error;
 965 }
 966
 967 /*
 968  * gfs2_unlink_ok - check to see that a inode is still in a directory
 969  * @dip: the directory
 970  * @name: the name of the file
 971  * @ip: the inode
 972  *
 973  * Assumes that the lock on (at least) @dip is held.
 974  *
 975  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
 976  */
 977
 978 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
 979                    struct gfs2_inode *ip)
 980 {
 981         struct gfs2_inum_host inum;
 982         unsigned int type;
 983         int error;
 984
 985         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
 986                 return -EPERM;
 987
 988         if ((dip->i_inode.i_mode & S_ISVTX) &&
 989             dip->i_inode.i_uid != current->fsuid &&
 990             ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
 991                 return -EPERM;
 992
 993         if (IS_APPEND(&dip->i_inode))
 994                 return -EPERM;
 995
 996         error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
 997         if (error)
 998                 return error;
 999
1000         error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1001         if (error)
1002                 return error;
1003
1004         if (!gfs2_inum_equal(&inum, &ip->i_num))
1005                 return -ENOENT;
1006
1007         if (IF2DT(ip->i_inode.i_mode) != type) {
1008                 gfs2_consist_inode(dip);
1009                 return -EIO;
1010         }
1011
1012         return 0;
1013 }
1014
1015 /*
1016  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1017  * @this: move this
1018  * @to: to here
1019  *
1020  * Follow @to back to the root and make sure we don't encounter @this
1021  * Assumes we already hold the rename lock.
1022  *
1023  * Returns: errno
1024  */
1025
1026 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1027 {
1028         struct inode *dir = &to->i_inode;
1029         struct super_block *sb = dir->i_sb;
1030         struct inode *tmp;
1031         struct qstr dotdot;
1032         int error = 0;
1033
1034         gfs2_str2qstr(&dotdot, "..");
1035
1036         igrab(dir);
1037
1038         for (;;) {
1039                 if (dir == &this->i_inode) {
1040                         error = -EINVAL;
1041                         break;
1042                 }
1043                 if (dir == sb->s_root->d_inode) {
1044                         error = 0;
1045                         break;
1046                 }
1047
1048                 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1049                 if (IS_ERR(tmp)) {
1050                         error = PTR_ERR(tmp);
1051                         break;
1052                 }
1053
1054                 iput(dir);
1055                 dir = tmp;
1056         }
1057
1058         iput(dir);
1059
1060         return error;
1061 }
1062
1063 /**
1064  * gfs2_readlinki - return the contents of a symlink
1065  * @ip: the symlink's inode
1066  * @buf: a pointer to the buffer to be filled
1067  * @len: a pointer to the length of @buf
1068  *
1069  * If @buf is too small, a piece of memory is kmalloc()ed and needs
1070  * to be freed by the caller.
1071  *
1072  * Returns: errno
1073  */
1074
1075 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1076 {
1077         struct gfs2_holder i_gh;
1078         struct buffer_head *dibh;
1079         unsigned int x;
1080         int error;
1081
1082         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1083         error = gfs2_glock_nq_atime(&i_gh);
1084         if (error) {
1085                 gfs2_holder_uninit(&i_gh);
1086                 return error;
1087         }
1088
1089         if (!ip->i_di.di_size) {
1090                 gfs2_consist_inode(ip);
1091                 error = -EIO;
1092                 goto out;
1093         }
1094
1095         error = gfs2_meta_inode_buffer(ip, &dibh);
1096         if (error)
1097                 goto out;
1098
1099         x = ip->i_di.di_size + 1;
1100         if (x > *len) {
1101                 *buf = kmalloc(x, GFP_KERNEL);
1102                 if (!*buf) {
1103                         error = -ENOMEM;
1104                         goto out_brelse;
1105                 }
1106         }
1107
1108         memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1109         *len = x;
1110
1111 out_brelse:
1112         brelse(dibh);
1113 out:
1114         gfs2_glock_dq_uninit(&i_gh);
1115         return error;
1116 }
1117
1118 /**
1119  * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1120  *       conditionally update the inode's atime
1121  * @gh: the holder to acquire
1122  *
1123  * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1124  * Update if the difference between the current time and the inode's current
1125  * atime is greater than an interval specified at mount.
1126  *
1127  * Returns: errno
1128  */
1129
1130 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1131 {
1132         struct gfs2_glock *gl = gh->gh_gl;
1133         struct gfs2_sbd *sdp = gl->gl_sbd;
1134         struct gfs2_inode *ip = gl->gl_object;
1135         s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1136         unsigned int state;
1137         int flags;
1138         int error;
1139
1140         if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1141             gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1142             gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1143                 return -EINVAL;
1144
1145         state = gh->gh_state;
1146         flags = gh->gh_flags;
1147
1148         error = gfs2_glock_nq(gh);
1149         if (error)
1150                 return error;
1151
1152         if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1153             (sdp->sd_vfs->s_flags & MS_RDONLY))
1154                 return 0;
1155
1156         curtime = get_seconds();
1157         if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1158                 gfs2_glock_dq(gh);
1159                 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1160                                    gh);
1161                 error = gfs2_glock_nq(gh);
1162                 if (error)
1163                         return error;
1164
1165                 /* Verify that atime hasn't been updated while we were
1166                    trying to get exclusive lock. */
1167
1168                 curtime = get_seconds();
1169                 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1170                         struct buffer_head *dibh;
1171                         struct gfs2_dinode *di;
1172
1173                         error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1174                         if (error == -EROFS)
1175                                 return 0;
1176                         if (error)
1177                                 goto fail;
1178
1179                         error = gfs2_meta_inode_buffer(ip, &dibh);
1180                         if (error)
1181                                 goto fail_end_trans;
1182
1183                         ip->i_inode.i_atime.tv_sec = curtime;
1184
1185                         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1186                         di = (struct gfs2_dinode *)dibh->b_data;
1187                         di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1188                         brelse(dibh);
1189
1190                         gfs2_trans_end(sdp);
1191                 }
1192
1193                 /* If someone else has asked for the glock,
1194                    unlock and let them have it. Then reacquire
1195                    in the original state. */
1196                 if (gfs2_glock_is_blocking(gl)) {
1197                         gfs2_glock_dq(gh);
1198                         gfs2_holder_reinit(state, flags, gh);
1199                         return gfs2_glock_nq(gh);
1200                 }
1201         }
1202
1203         return 0;
1204
1205 fail_end_trans:
1206         gfs2_trans_end(sdp);
1207 fail:
1208         gfs2_glock_dq(gh);
1209         return error;
1210 }
1211
1212 static int
1213 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1214 {
1215         struct buffer_head *dibh;
1216         int error;
1217
1218         error = gfs2_meta_inode_buffer(ip, &dibh);
1219         if (!error) {
1220                 error = inode_setattr(&ip->i_inode, attr);
1221                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1222                 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1223                 gfs2_dinode_out(ip, dibh->b_data);
1224                 brelse(dibh);
1225         }
1226         return error;
1227 }
1228
1229 /**
1230  * gfs2_setattr_simple -
1231  * @ip:
1232  * @attr:
1233  *
1234  * Called with a reference on the vnode.
1235  *
1236  * Returns: errno
1237  */
1238
1239 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1240 {
1241         int error;
1242
1243         if (current->journal_info)
1244                 return __gfs2_setattr_simple(ip, attr);
1245
1246         error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1247         if (error)
1248                 return error;
1249
1250         error = __gfs2_setattr_simple(ip, attr);
1251         gfs2_trans_end(GFS2_SB(&ip->i_inode));
1252         return error;
1253 }
1254