fs/gfs2/inode.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #include <linux/slab.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/completion.h>
  10 #include <linux/buffer_head.h>
  11 #include <linux/namei.h>
  12 #include <linux/mm.h>
  13 #include <linux/cred.h>
  14 #include <linux/xattr.h>
  15 #include <linux/posix_acl.h>
  16 #include <linux/gfs2_ondisk.h>
  17 #include <linux/crc32.h>
  18 #include <linux/iomap.h>
  19 #include <linux/security.h>
  20 #include <linux/uaccess.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "acl.h"
  25 #include "bmap.h"
  26 #include "dir.h"
  27 #include "xattr.h"
  28 #include "glock.h"
  29 #include "inode.h"
  30 #include "meta_io.h"
  31 #include "quota.h"
  32 #include "rgrp.h"
  33 #include "trans.h"
  34 #include "util.h"
  35 #include "super.h"
  36 #include "glops.h"
  37
  38 static int iget_test(struct inode *inode, void *opaque)
  39 {
  40         u64 no_addr = *(u64 *)opaque;
  41
  42         return GFS2_I(inode)->i_no_addr == no_addr;
  43 }
  44
  45 static int iget_set(struct inode *inode, void *opaque)
  46 {
  47         u64 no_addr = *(u64 *)opaque;
  48
  49         GFS2_I(inode)->i_no_addr = no_addr;
  50         inode->i_ino = no_addr;
  51         return 0;
  52 }
  53
  54 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
  55 {
  56         struct inode *inode;
  57
  58 repeat:
  59         inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
  60         if (!inode)
  61                 return inode;
  62         if (is_bad_inode(inode)) {
  63                 iput(inode);
  64                 goto repeat;
  65         }
  66         return inode;
  67 }
  68
  69 /**
  70  * gfs2_set_iop - Sets inode operations
  71  * @inode: The inode with correct i_mode filled in
  72  *
  73  * GFS2 lookup code fills in vfs inode contents based on info obtained
  74  * from directory entry inside gfs2_inode_lookup().
  75  */
  76
  77 static void gfs2_set_iop(struct inode *inode)
  78 {
  79         struct gfs2_sbd *sdp = GFS2_SB(inode);
  80         umode_t mode = inode->i_mode;
  81
  82         if (S_ISREG(mode)) {
  83                 inode->i_op = &gfs2_file_iops;
  84                 if (gfs2_localflocks(sdp))
  85                         inode->i_fop = &gfs2_file_fops_nolock;
  86                 else
  87                         inode->i_fop = &gfs2_file_fops;
  88         } else if (S_ISDIR(mode)) {
  89                 inode->i_op = &gfs2_dir_iops;
  90                 if (gfs2_localflocks(sdp))
  91                         inode->i_fop = &gfs2_dir_fops_nolock;
  92                 else
  93                         inode->i_fop = &gfs2_dir_fops;
  94         } else if (S_ISLNK(mode)) {
  95                 inode->i_op = &gfs2_symlink_iops;
  96         } else {
  97                 inode->i_op = &gfs2_file_iops;
  98                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  99         }
 100 }
 101
 102 /**
 103  * gfs2_inode_lookup - Lookup an inode
 104  * @sb: The super block
 105  * @type: The type of the inode
 106  * @no_addr: The inode number
 107  * @no_formal_ino: The inode generation number
 108  * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
 109  *           GFS2_BLKST_FREE to indicate not to verify)
 110  *
 111  * If @type is DT_UNKNOWN, the inode type is fetched from disk.
 112  *
 113  * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
 114  * placeholder because it doesn't otherwise make sense), the on-disk block type
 115  * is verified to be @blktype.
 116  *
 117  * Returns: A VFS inode, or an error
 118  */
 119
 120 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 121                                 u64 no_addr, u64 no_formal_ino,
 122                                 unsigned int blktype)
 123 {
 124         struct inode *inode;
 125         struct gfs2_inode *ip;
 126         struct gfs2_glock *io_gl = NULL;
 127         struct gfs2_holder i_gh;
 128         int error;
 129
 130         gfs2_holder_mark_uninitialized(&i_gh);
 131         inode = gfs2_iget(sb, no_addr);
 132         if (!inode)
 133                 return ERR_PTR(-ENOMEM);
 134
 135         ip = GFS2_I(inode);
 136
 137         if (inode->i_state & I_NEW) {
 138                 struct gfs2_sbd *sdp = GFS2_SB(inode);
 139
 140                 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 141                 if (unlikely(error))
 142                         goto fail;
 143                 flush_delayed_work(&ip->i_gl->gl_work);
 144
 145                 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 146                 if (unlikely(error))
 147                         goto fail;
 148
 149                 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
 150                         /*
 151                          * The GL_SKIP flag indicates to skip reading the inode
 152                          * block.  We read the inode with gfs2_inode_refresh
 153                          * after possibly checking the block type.
 154                          */
 155                         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
 156                                                    GL_SKIP, &i_gh);
 157                         if (error)
 158                                 goto fail;
 159
 160                         if (blktype != GFS2_BLKST_FREE) {
 161                                 error = gfs2_check_blk_type(sdp, no_addr,
 162                                                             blktype);
 163                                 if (error)
 164                                         goto fail;
 165                         }
 166                 }
 167
 168                 glock_set_object(ip->i_gl, ip);
 169                 set_bit(GIF_INVALID, &ip->i_flags);
 170                 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 171                 if (unlikely(error))
 172                         goto fail;
 173                 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 174                 gfs2_glock_put(io_gl);
 175                 io_gl = NULL;
 176
 177                 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
 178                 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
 179                 inode->i_atime.tv_nsec = 0;
 180
 181                 if (type == DT_UNKNOWN) {
 182                         /* Inode glock must be locked already */
 183                         error = gfs2_inode_refresh(GFS2_I(inode));
 184                         if (error)
 185                                 goto fail;
 186                 } else {
 187                         ip->i_no_formal_ino = no_formal_ino;
 188                         inode->i_mode = DT2IF(type);
 189                 }
 190
 191                 gfs2_set_iop(inode);
 192
 193                 unlock_new_inode(inode);
 194         }
 195
 196         if (gfs2_holder_initialized(&i_gh))
 197                 gfs2_glock_dq_uninit(&i_gh);
 198         return inode;
 199
 200 fail:
 201         if (io_gl)
 202                 gfs2_glock_put(io_gl);
 203         if (gfs2_holder_initialized(&i_gh))
 204                 gfs2_glock_dq_uninit(&i_gh);
 205         iget_failed(inode);
 206         return ERR_PTR(error);
 207 }
 208
 209 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 210                                   u64 *no_formal_ino, unsigned int blktype)
 211 {
 212         struct super_block *sb = sdp->sd_vfs;
 213         struct inode *inode;
 214         int error;
 215
 216         inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
 217         if (IS_ERR(inode))
 218                 return inode;
 219
 220         /* Two extra checks for NFS only */
 221         if (no_formal_ino) {
 222                 error = -ESTALE;
 223                 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
 224                         goto fail_iput;
 225
 226                 error = -EIO;
 227                 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
 228                         goto fail_iput;
 229         }
 230         return inode;
 231
 232 fail_iput:
 233         iput(inode);
 234         return ERR_PTR(error);
 235 }
 236
 237
 238 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
 239 {
 240         struct qstr qstr;
 241         struct inode *inode;
 242         gfs2_str2qstr(&qstr, name);
 243         inode = gfs2_lookupi(dip, &qstr, 1);
 244         /* gfs2_lookupi has inconsistent callers: vfs
 245          * related routines expect NULL for no entry found,
 246          * gfs2_lookup_simple callers expect ENOENT
 247          * and do not check for NULL.
 248          */
 249         if (inode == NULL)
 250                 return ERR_PTR(-ENOENT);
 251         else
 252                 return inode;
 253 }
 254
 255
 256 /**
 257  * gfs2_lookupi - Look up a filename in a directory and return its inode
 258  * @d_gh: An initialized holder for the directory glock
 259  * @name: The name of the inode to look for
 260  * @is_root: If 1, ignore the caller's permissions
 261  * @i_gh: An uninitialized holder for the new inode glock
 262  *
 263  * This can be called via the VFS filldir function when NFS is doing
 264  * a readdirplus and the inode which its intending to stat isn't
 265  * already in cache. In this case we must not take the directory glock
 266  * again, since the readdir call will have already taken that lock.
 267  *
 268  * Returns: errno
 269  */
 270
 271 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 272                            int is_root)
 273 {
 274         struct super_block *sb = dir->i_sb;
 275         struct gfs2_inode *dip = GFS2_I(dir);
 276         struct gfs2_holder d_gh;
 277         int error = 0;
 278         struct inode *inode = NULL;
 279
 280         gfs2_holder_mark_uninitialized(&d_gh);
 281         if (!name->len || name->len > GFS2_FNAMESIZE)
 282                 return ERR_PTR(-ENAMETOOLONG);
 283
 284         if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
 285             (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
 286              dir == d_inode(sb->s_root))) {
 287                 igrab(dir);
 288                 return dir;
 289         }
 290
 291         if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
 292                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
 293                 if (error)
 294                         return ERR_PTR(error);
 295         }
 296
 297         if (!is_root) {
 298                 error = gfs2_permission(dir, MAY_EXEC);
 299                 if (error)
 300                         goto out;
 301         }
 302
 303         inode = gfs2_dir_search(dir, name, false);
 304         if (IS_ERR(inode))
 305                 error = PTR_ERR(inode);
 306 out:
 307         if (gfs2_holder_initialized(&d_gh))
 308                 gfs2_glock_dq_uninit(&d_gh);
 309         if (error == -ENOENT)
 310                 return NULL;
 311         return inode ? inode : ERR_PTR(error);
 312 }
 313
 314 /**
 315  * create_ok - OK to create a new on-disk inode here?
 316  * @dip:  Directory in which dinode is to be created
 317  * @name:  Name of new dinode
 318  * @mode:
 319  *
 320  * Returns: errno
 321  */
 322
 323 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 324                      umode_t mode)
 325 {
 326         int error;
 327
 328         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
 329         if (error)
 330                 return error;
 331
 332         /*  Don't create entries in an unlinked directory  */
 333         if (!dip->i_inode.i_nlink)
 334                 return -ENOENT;
 335
 336         if (dip->i_entries == (u32)-1)
 337                 return -EFBIG;
 338         if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
 339                 return -EMLINK;
 340
 341         return 0;
 342 }
 343
 344 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
 345                                struct inode *inode)
 346 {
 347         if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
 348             (dip->i_inode.i_mode & S_ISUID) &&
 349             !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
 350                 if (S_ISDIR(inode->i_mode))
 351                         inode->i_mode |= S_ISUID;
 352                 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
 353                         inode->i_mode &= ~07111;
 354                 inode->i_uid = dip->i_inode.i_uid;
 355         } else
 356                 inode->i_uid = current_fsuid();
 357
 358         if (dip->i_inode.i_mode & S_ISGID) {
 359                 if (S_ISDIR(inode->i_mode))
 360                         inode->i_mode |= S_ISGID;
 361                 inode->i_gid = dip->i_inode.i_gid;
 362         } else
 363                 inode->i_gid = current_fsgid();
 364 }
 365
 366 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
 367 {
 368         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 369         struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
 370         int error;
 371
 372         error = gfs2_quota_lock_check(ip, &ap);
 373         if (error)
 374                 goto out;
 375
 376         error = gfs2_inplace_reserve(ip, &ap);
 377         if (error)
 378                 goto out_quota;
 379
 380         error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
 381         if (error)
 382                 goto out_ipreserv;
 383
 384         error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
 385         ip->i_no_formal_ino = ip->i_generation;
 386         ip->i_inode.i_ino = ip->i_no_addr;
 387         ip->i_goal = ip->i_no_addr;
 388
 389         gfs2_trans_end(sdp);
 390
 391 out_ipreserv:
 392         gfs2_inplace_release(ip);
 393 out_quota:
 394         gfs2_quota_unlock(ip);
 395 out:
 396         return error;
 397 }
 398
 399 static void gfs2_init_dir(struct buffer_head *dibh,
 400                           const struct gfs2_inode *parent)
 401 {
 402         struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 403         struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 404
 405         gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
 406         dent->de_inum = di->di_num; /* already GFS2 endian */
 407         dent->de_type = cpu_to_be16(DT_DIR);
 408
 409         dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 410         gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 411         gfs2_inum_out(parent, dent);
 412         dent->de_type = cpu_to_be16(DT_DIR);
 413
 414 }
 415
 416 /**
 417  * gfs2_init_xattr - Initialise an xattr block for a new inode
 418  * @ip: The inode in question
 419  *
 420  * This sets up an empty xattr block for a new inode, ready to
 421  * take any ACLs, LSM xattrs, etc.
 422  */
 423
 424 static void gfs2_init_xattr(struct gfs2_inode *ip)
 425 {
 426         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 427         struct buffer_head *bh;
 428         struct gfs2_ea_header *ea;
 429
 430         bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
 431         gfs2_trans_add_meta(ip->i_gl, bh);
 432         gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 433         gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
 434
 435         ea = GFS2_EA_BH2FIRST(bh);
 436         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 437         ea->ea_type = GFS2_EATYPE_UNUSED;
 438         ea->ea_flags = GFS2_EAFLAG_LAST;
 439
 440         brelse(bh);
 441 }
 442
 443 /**
 444  * init_dinode - Fill in a new dinode structure
 445  * @dip: The directory this inode is being created in
 446  * @ip: The inode
 447  * @symname: The symlink destination (if a symlink)
 448  * @bhp: The buffer head (returned to caller)
 449  *
 450  */
 451
 452 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
 453                         const char *symname)
 454 {
 455         struct gfs2_dinode *di;
 456         struct buffer_head *dibh;
 457
 458         dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
 459         gfs2_trans_add_meta(ip->i_gl, dibh);
 460         di = (struct gfs2_dinode *)dibh->b_data;
 461         gfs2_dinode_out(ip, di);
 462
 463         di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
 464         di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
 465         di->__pad1 = 0;
 466         di->__pad2 = 0;
 467         di->__pad3 = 0;
 468         memset(&di->__pad4, 0, sizeof(di->__pad4));
 469         memset(&di->di_reserved, 0, sizeof(di->di_reserved));
 470         gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 471
 472         switch(ip->i_inode.i_mode & S_IFMT) {
 473         case S_IFDIR:
 474                 gfs2_init_dir(dibh, dip);
 475                 break;
 476         case S_IFLNK:
 477                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
 478                 break;
 479         }
 480
 481         set_buffer_uptodate(dibh);
 482         brelse(dibh);
 483 }
 484
 485 /**
 486  * gfs2_trans_da_blocks - Calculate number of blocks to link inode
 487  * @dip: The directory we are linking into
 488  * @da: The dir add information
 489  * @nr_inodes: The number of inodes involved
 490  *
 491  * This calculate the number of blocks we need to reserve in a
 492  * transaction to link @nr_inodes into a directory. In most cases
 493  * @nr_inodes will be 2 (the directory plus the inode being linked in)
 494  * but in case of rename, 4 may be required.
 495  *
 496  * Returns: Number of blocks
 497  */
 498
 499 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
 500                                    const struct gfs2_diradd *da,
 501                                    unsigned nr_inodes)
 502 {
 503         return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
 504                (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
 505 }
 506
 507 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
 508                        struct gfs2_inode *ip, struct gfs2_diradd *da)
 509 {
 510         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 511         struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
 512         int error;
 513
 514         if (da->nr_blocks) {
 515                 error = gfs2_quota_lock_check(dip, &ap);
 516                 if (error)
 517                         goto fail_quota_locks;
 518
 519                 error = gfs2_inplace_reserve(dip, &ap);
 520                 if (error)
 521                         goto fail_quota_locks;
 522
 523                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
 524                 if (error)
 525                         goto fail_ipreserv;
 526         } else {
 527                 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
 528                 if (error)
 529                         goto fail_quota_locks;
 530         }
 531
 532         error = gfs2_dir_add(&dip->i_inode, name, ip, da);
 533
 534         gfs2_trans_end(sdp);
 535 fail_ipreserv:
 536         gfs2_inplace_release(dip);
 537 fail_quota_locks:
 538         gfs2_quota_unlock(dip);
 539         return error;
 540 }
 541
 542 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 543                     void *fs_info)
 544 {
 545         const struct xattr *xattr;
 546         int err = 0;
 547
 548         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 549                 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
 550                                        xattr->value_len, 0,
 551                                        GFS2_EATYPE_SECURITY);
 552                 if (err < 0)
 553                         break;
 554         }
 555         return err;
 556 }
 557
 558 /**
 559  * gfs2_create_inode - Create a new inode
 560  * @dir: The parent directory
 561  * @dentry: The new dentry
 562  * @file: If non-NULL, the file which is being opened
 563  * @mode: The permissions on the new inode
 564  * @dev: For device nodes, this is the device number
 565  * @symname: For symlinks, this is the link destination
 566  * @size: The initial size of the inode (ignored for directories)
 567  *
 568  * Returns: 0 on success, or error code
 569  */
 570
 571 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 572                              struct file *file,
 573                              umode_t mode, dev_t dev, const char *symname,
 574                              unsigned int size, int excl)
 575 {
 576         const struct qstr *name = &dentry->d_name;
 577         struct posix_acl *default_acl, *acl;
 578         struct gfs2_holder ghs[2];
 579         struct inode *inode = NULL;
 580         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 581         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 582         struct gfs2_glock *io_gl = NULL;
 583         int error, free_vfs_inode = 1;
 584         u32 aflags = 0;
 585         unsigned blocks = 1;
 586         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 587
 588         if (!name->len || name->len > GFS2_FNAMESIZE)
 589                 return -ENAMETOOLONG;
 590
 591         error = gfs2_qa_get(dip);
 592         if (error)
 593                 return error;
 594
 595         error = gfs2_rindex_update(sdp);
 596         if (error)
 597                 goto fail;
 598
 599         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 600         if (error)
 601                 goto fail;
 602         gfs2_holder_mark_uninitialized(ghs + 1);
 603
 604         error = create_ok(dip, name, mode);
 605         if (error)
 606                 goto fail_gunlock;
 607
 608         inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
 609         error = PTR_ERR(inode);
 610         if (!IS_ERR(inode)) {
 611                 if (S_ISDIR(inode->i_mode)) {
 612                         iput(inode);
 613                         inode = ERR_PTR(-EISDIR);
 614                         goto fail_gunlock;
 615                 }
 616                 d_instantiate(dentry, inode);
 617                 error = 0;
 618                 if (file) {
 619                         if (S_ISREG(inode->i_mode))
 620                                 error = finish_open(file, dentry, gfs2_open_common);
 621                         else
 622                                 error = finish_no_open(file, NULL);
 623                 }
 624                 gfs2_glock_dq_uninit(ghs);
 625                 goto fail;
 626         } else if (error != -ENOENT) {
 627                 goto fail_gunlock;
 628         }
 629
 630         error = gfs2_diradd_alloc_required(dir, name, &da);
 631         if (error < 0)
 632                 goto fail_gunlock;
 633
 634         inode = new_inode(sdp->sd_vfs);
 635         error = -ENOMEM;
 636         if (!inode)
 637                 goto fail_gunlock;
 638
 639         error = posix_acl_create(dir, &mode, &default_acl, &acl);
 640         if (error)
 641                 goto fail_gunlock;
 642
 643         ip = GFS2_I(inode);
 644         error = gfs2_qa_get(ip);
 645         if (error)
 646                 goto fail_free_acls;
 647
 648         inode->i_mode = mode;
 649         set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
 650         inode->i_rdev = dev;
 651         inode->i_size = size;
 652         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 653         munge_mode_uid_gid(dip, inode);
 654         check_and_update_goal(dip);
 655         ip->i_goal = dip->i_goal;
 656         ip->i_diskflags = 0;
 657         ip->i_eattr = 0;
 658         ip->i_height = 0;
 659         ip->i_depth = 0;
 660         ip->i_entries = 0;
 661         ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
 662
 663         switch(mode & S_IFMT) {
 664         case S_IFREG:
 665                 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
 666                     gfs2_tune_get(sdp, gt_new_files_jdata))
 667                         ip->i_diskflags |= GFS2_DIF_JDATA;
 668                 gfs2_set_aops(inode);
 669                 break;
 670         case S_IFDIR:
 671                 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
 672                 ip->i_diskflags |= GFS2_DIF_JDATA;
 673                 ip->i_entries = 2;
 674                 break;
 675         }
 676
 677         /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
 678         if (dip->i_diskflags & GFS2_DIF_SYSTEM)
 679                 ip->i_diskflags |= GFS2_DIF_SYSTEM;
 680
 681         gfs2_set_inode_flags(inode);
 682
 683         if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
 684             (dip->i_diskflags & GFS2_DIF_TOPDIR))
 685                 aflags |= GFS2_AF_ORLOV;
 686
 687         if (default_acl || acl)
 688                 blocks++;
 689
 690         error = alloc_dinode(ip, aflags, &blocks);
 691         if (error)
 692                 goto fail_free_inode;
 693
 694         gfs2_set_inode_blocks(inode, blocks);
 695
 696         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 697         if (error)
 698                 goto fail_free_inode;
 699         flush_delayed_work(&ip->i_gl->gl_work);
 700         glock_set_object(ip->i_gl, ip);
 701
 702         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
 703         if (error)
 704                 goto fail_free_inode;
 705
 706         error = gfs2_trans_begin(sdp, blocks, 0);
 707         if (error)
 708                 goto fail_free_inode;
 709
 710         if (blocks > 1) {
 711                 ip->i_eattr = ip->i_no_addr + 1;
 712                 gfs2_init_xattr(ip);
 713         }
 714         init_dinode(dip, ip, symname);
 715         gfs2_trans_end(sdp);
 716
 717         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 718         if (error)
 719                 goto fail_free_inode;
 720
 721         BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
 722
 723         error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 724         if (error)
 725                 goto fail_gunlock2;
 726
 727         glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 728         gfs2_set_iop(inode);
 729         insert_inode_hash(inode);
 730
 731         free_vfs_inode = 0; /* After this point, the inode is no longer
 732                                considered free. Any failures need to undo
 733                                the gfs2 structures. */
 734         if (default_acl) {
 735                 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 736                 if (error)
 737                         goto fail_gunlock3;
 738                 posix_acl_release(default_acl);
 739                 default_acl = NULL;
 740         }
 741         if (acl) {
 742                 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
 743                 if (error)
 744                         goto fail_gunlock3;
 745                 posix_acl_release(acl);
 746                 acl = NULL;
 747         }
 748
 749         error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
 750                                              &gfs2_initxattrs, NULL);
 751         if (error)
 752                 goto fail_gunlock3;
 753
 754         error = link_dinode(dip, name, ip, &da);
 755         if (error)
 756                 goto fail_gunlock3;
 757
 758         mark_inode_dirty(inode);
 759         d_instantiate(dentry, inode);
 760         /* After instantiate, errors should result in evict which will destroy
 761          * both inode and iopen glocks properly. */
 762         if (file) {
 763                 file->f_mode |= FMODE_CREATED;
 764                 error = finish_open(file, dentry, gfs2_open_common);
 765         }
 766         gfs2_glock_dq_uninit(ghs);
 767         gfs2_qa_put(ip);
 768         gfs2_glock_dq_uninit(ghs + 1);
 769         clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 770         gfs2_glock_put(io_gl);
 771         gfs2_qa_put(dip);
 772         return error;
 773
 774 fail_gunlock3:
 775         glock_clear_object(io_gl, ip);
 776         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 777 fail_gunlock2:
 778         clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 779         gfs2_glock_put(io_gl);
 780 fail_free_inode:
 781         if (ip->i_gl) {
 782                 glock_clear_object(ip->i_gl, ip);
 783                 gfs2_glock_put(ip->i_gl);
 784         }
 785         gfs2_rs_delete(ip, NULL);
 786         gfs2_qa_put(ip);
 787 fail_free_acls:
 788         posix_acl_release(default_acl);
 789         posix_acl_release(acl);
 790 fail_gunlock:
 791         gfs2_dir_no_add(&da);
 792         gfs2_glock_dq_uninit(ghs);
 793         if (!IS_ERR_OR_NULL(inode)) {
 794                 clear_nlink(inode);
 795                 if (!free_vfs_inode)
 796                         mark_inode_dirty(inode);
 797                 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
 798                         &GFS2_I(inode)->i_flags);
 799                 iput(inode);
 800         }
 801         if (gfs2_holder_initialized(ghs + 1))
 802                 gfs2_glock_dq_uninit(ghs + 1);
 803 fail:
 804         gfs2_qa_put(dip);
 805         return error;
 806 }
 807
 808 /**
 809  * gfs2_create - Create a file
 810  * @dir: The directory in which to create the file
 811  * @dentry: The dentry of the new file
 812  * @mode: The mode of the new file
 813  *
 814  * Returns: errno
 815  */
 816
 817 static int gfs2_create(struct inode *dir, struct dentry *dentry,
 818                        umode_t mode, bool excl)
 819 {
 820         return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
 821 }
 822
 823 /**
 824  * __gfs2_lookup - Look up a filename in a directory and return its inode
 825  * @dir: The directory inode
 826  * @dentry: The dentry of the new inode
 827  * @file: File to be opened
 828  *
 829  *
 830  * Returns: errno
 831  */
 832
 833 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
 834                                     struct file *file)
 835 {
 836         struct inode *inode;
 837         struct dentry *d;
 838         struct gfs2_holder gh;
 839         struct gfs2_glock *gl;
 840         int error;
 841
 842         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 843         if (inode == NULL) {
 844                 d_add(dentry, NULL);
 845                 return NULL;
 846         }
 847         if (IS_ERR(inode))
 848                 return ERR_CAST(inode);
 849
 850         gl = GFS2_I(inode)->i_gl;
 851         error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 852         if (error) {
 853                 iput(inode);
 854                 return ERR_PTR(error);
 855         }
 856
 857         d = d_splice_alias(inode, dentry);
 858         if (IS_ERR(d)) {
 859                 gfs2_glock_dq_uninit(&gh);
 860                 return d;
 861         }
 862         if (file && S_ISREG(inode->i_mode))
 863                 error = finish_open(file, dentry, gfs2_open_common);
 864
 865         gfs2_glock_dq_uninit(&gh);
 866         if (error) {
 867                 dput(d);
 868                 return ERR_PTR(error);
 869         }
 870         return d;
 871 }
 872
 873 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 874                                   unsigned flags)
 875 {
 876         return __gfs2_lookup(dir, dentry, NULL);
 877 }
 878
 879 /**
 880  * gfs2_link - Link to a file
 881  * @old_dentry: The inode to link
 882  * @dir: Add link to this directory
 883  * @dentry: The name of the link
 884  *
 885  * Link the inode in "old_dentry" into the directory "dir" with the
 886  * name in "dentry".
 887  *
 888  * Returns: errno
 889  */
 890
 891 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 892                      struct dentry *dentry)
 893 {
 894         struct gfs2_inode *dip = GFS2_I(dir);
 895         struct gfs2_sbd *sdp = GFS2_SB(dir);
 896         struct inode *inode = d_inode(old_dentry);
 897         struct gfs2_inode *ip = GFS2_I(inode);
 898         struct gfs2_holder ghs[2];
 899         struct buffer_head *dibh;
 900         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 901         int error;
 902
 903         if (S_ISDIR(inode->i_mode))
 904                 return -EPERM;
 905
 906         error = gfs2_qa_get(dip);
 907         if (error)
 908                 return error;
 909
 910         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 911         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 912
 913         error = gfs2_glock_nq(ghs); /* parent */
 914         if (error)
 915                 goto out_parent;
 916
 917         error = gfs2_glock_nq(ghs + 1); /* child */
 918         if (error)
 919                 goto out_child;
 920
 921         error = -ENOENT;
 922         if (inode->i_nlink == 0)
 923                 goto out_gunlock;
 924
 925         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
 926         if (error)
 927                 goto out_gunlock;
 928
 929         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 930         switch (error) {
 931         case -ENOENT:
 932                 break;
 933         case 0:
 934                 error = -EEXIST;
 935         default:
 936                 goto out_gunlock;
 937         }
 938
 939         error = -EINVAL;
 940         if (!dip->i_inode.i_nlink)
 941                 goto out_gunlock;
 942         error = -EFBIG;
 943         if (dip->i_entries == (u32)-1)
 944                 goto out_gunlock;
 945         error = -EPERM;
 946         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 947                 goto out_gunlock;
 948         error = -EINVAL;
 949         if (!ip->i_inode.i_nlink)
 950                 goto out_gunlock;
 951         error = -EMLINK;
 952         if (ip->i_inode.i_nlink == (u32)-1)
 953                 goto out_gunlock;
 954
 955         error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
 956         if (error < 0)
 957                 goto out_gunlock;
 958
 959         if (da.nr_blocks) {
 960                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
 961                 error = gfs2_quota_lock_check(dip, &ap);
 962                 if (error)
 963                         goto out_gunlock;
 964
 965                 error = gfs2_inplace_reserve(dip, &ap);
 966                 if (error)
 967                         goto out_gunlock_q;
 968
 969                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
 970                 if (error)
 971                         goto out_ipres;
 972         } else {
 973                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 974                 if (error)
 975                         goto out_ipres;
 976         }
 977
 978         error = gfs2_meta_inode_buffer(ip, &dibh);
 979         if (error)
 980                 goto out_end_trans;
 981
 982         error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
 983         if (error)
 984                 goto out_brelse;
 985
 986         gfs2_trans_add_meta(ip->i_gl, dibh);
 987         inc_nlink(&ip->i_inode);
 988         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 989         ihold(inode);
 990         d_instantiate(dentry, inode);
 991         mark_inode_dirty(inode);
 992
 993 out_brelse:
 994         brelse(dibh);
 995 out_end_trans:
 996         gfs2_trans_end(sdp);
 997 out_ipres:
 998         if (da.nr_blocks)
 999                 gfs2_inplace_release(dip);
1000 out_gunlock_q:
1001         if (da.nr_blocks)
1002                 gfs2_quota_unlock(dip);
1003 out_gunlock:
1004         gfs2_dir_no_add(&da);
1005         gfs2_glock_dq(ghs + 1);
1006 out_child:
1007         gfs2_glock_dq(ghs);
1008 out_parent:
1009         gfs2_qa_put(dip);
1010         gfs2_holder_uninit(ghs);
1011         gfs2_holder_uninit(ghs + 1);
1012         return error;
1013 }
1014
1015 /*
1016  * gfs2_unlink_ok - check to see that a inode is still in a directory
1017  * @dip: the directory
1018  * @name: the name of the file
1019  * @ip: the inode
1020  *
1021  * Assumes that the lock on (at least) @dip is held.
1022  *
1023  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1024  */
1025
1026 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1027                           const struct gfs2_inode *ip)
1028 {
1029         int error;
1030
1031         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1032                 return -EPERM;
1033
1034         if ((dip->i_inode.i_mode & S_ISVTX) &&
1035             !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1036             !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1037                 return -EPERM;
1038
1039         if (IS_APPEND(&dip->i_inode))
1040                 return -EPERM;
1041
1042         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1043         if (error)
1044                 return error;
1045
1046         return gfs2_dir_check(&dip->i_inode, name, ip);
1047 }
1048
1049 /**
1050  * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1051  * @dip: The parent directory
1052  * @name: The name of the entry in the parent directory
1053  * @inode: The inode to be removed
1054  *
1055  * Called with all the locks and in a transaction. This will only be
1056  * called for a directory after it has been checked to ensure it is empty.
1057  *
1058  * Returns: 0 on success, or an error
1059  */
1060
1061 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1062                              const struct dentry *dentry)
1063 {
1064         struct inode *inode = d_inode(dentry);
1065         struct gfs2_inode *ip = GFS2_I(inode);
1066         int error;
1067
1068         error = gfs2_dir_del(dip, dentry);
1069         if (error)
1070                 return error;
1071
1072         ip->i_entries = 0;
1073         inode->i_ctime = current_time(inode);
1074         if (S_ISDIR(inode->i_mode))
1075                 clear_nlink(inode);
1076         else
1077                 drop_nlink(inode);
1078         mark_inode_dirty(inode);
1079         if (inode->i_nlink == 0)
1080                 gfs2_unlink_di(inode);
1081         return 0;
1082 }
1083
1084
1085 /**
1086  * gfs2_unlink - Unlink an inode (this does rmdir as well)
1087  * @dir: The inode of the directory containing the inode to unlink
1088  * @dentry: The file itself
1089  *
1090  * This routine uses the type of the inode as a flag to figure out
1091  * whether this is an unlink or an rmdir.
1092  *
1093  * Returns: errno
1094  */
1095
1096 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1097 {
1098         struct gfs2_inode *dip = GFS2_I(dir);
1099         struct gfs2_sbd *sdp = GFS2_SB(dir);
1100         struct inode *inode = d_inode(dentry);
1101         struct gfs2_inode *ip = GFS2_I(inode);
1102         struct gfs2_holder ghs[3];
1103         struct gfs2_rgrpd *rgd;
1104         int error;
1105
1106         error = gfs2_rindex_update(sdp);
1107         if (error)
1108                 return error;
1109
1110         error = -EROFS;
1111
1112         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1113         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1114
1115         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1116         if (!rgd)
1117                 goto out_inodes;
1118
1119         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1120
1121
1122         error = gfs2_glock_nq(ghs); /* parent */
1123         if (error)
1124                 goto out_parent;
1125
1126         error = gfs2_glock_nq(ghs + 1); /* child */
1127         if (error)
1128                 goto out_child;
1129
1130         error = -ENOENT;
1131         if (inode->i_nlink == 0)
1132                 goto out_rgrp;
1133
1134         if (S_ISDIR(inode->i_mode)) {
1135                 error = -ENOTEMPTY;
1136                 if (ip->i_entries > 2 || inode->i_nlink > 2)
1137                         goto out_rgrp;
1138         }
1139
1140         error = gfs2_glock_nq(ghs + 2); /* rgrp */
1141         if (error)
1142                 goto out_rgrp;
1143
1144         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1145         if (error)
1146                 goto out_gunlock;
1147
1148         error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1149         if (error)
1150                 goto out_gunlock;
1151
1152         error = gfs2_unlink_inode(dip, dentry);
1153         gfs2_trans_end(sdp);
1154
1155 out_gunlock:
1156         gfs2_glock_dq(ghs + 2);
1157 out_rgrp:
1158         gfs2_glock_dq(ghs + 1);
1159 out_child:
1160         gfs2_glock_dq(ghs);
1161 out_parent:
1162         gfs2_holder_uninit(ghs + 2);
1163 out_inodes:
1164         gfs2_holder_uninit(ghs + 1);
1165         gfs2_holder_uninit(ghs);
1166         return error;
1167 }
1168
1169 /**
1170  * gfs2_symlink - Create a symlink
1171  * @dir: The directory to create the symlink in
1172  * @dentry: The dentry to put the symlink in
1173  * @symname: The thing which the link points to
1174  *
1175  * Returns: errno
1176  */
1177
1178 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1179                         const char *symname)
1180 {
1181         unsigned int size;
1182
1183         size = strlen(symname);
1184         if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1185                 return -ENAMETOOLONG;
1186
1187         return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1188 }
1189
1190 /**
1191  * gfs2_mkdir - Make a directory
1192  * @dir: The parent directory of the new one
1193  * @dentry: The dentry of the new directory
1194  * @mode: The mode of the new directory
1195  *
1196  * Returns: errno
1197  */
1198
1199 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1200 {
1201         unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1202         return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1203 }
1204
1205 /**
1206  * gfs2_mknod - Make a special file
1207  * @dir: The directory in which the special file will reside
1208  * @dentry: The dentry of the special file
1209  * @mode: The mode of the special file
1210  * @dev: The device specification of the special file
1211  *
1212  */
1213
1214 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1215                       dev_t dev)
1216 {
1217         return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1218 }
1219
1220 /**
1221  * gfs2_atomic_open - Atomically open a file
1222  * @dir: The directory
1223  * @dentry: The proposed new entry
1224  * @file: The proposed new struct file
1225  * @flags: open flags
1226  * @mode: File mode
1227  *
1228  * Returns: error code or 0 for success
1229  */
1230
1231 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1232                             struct file *file, unsigned flags,
1233                             umode_t mode)
1234 {
1235         struct dentry *d;
1236         bool excl = !!(flags & O_EXCL);
1237
1238         if (!d_in_lookup(dentry))
1239                 goto skip_lookup;
1240
1241         d = __gfs2_lookup(dir, dentry, file);
1242         if (IS_ERR(d))
1243                 return PTR_ERR(d);
1244         if (d != NULL)
1245                 dentry = d;
1246         if (d_really_is_positive(dentry)) {
1247                 if (!(file->f_mode & FMODE_OPENED))
1248                         return finish_no_open(file, d);
1249                 dput(d);
1250                 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1251         }
1252
1253         BUG_ON(d != NULL);
1254
1255 skip_lookup:
1256         if (!(flags & O_CREAT))
1257                 return -ENOENT;
1258
1259         return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1260 }
1261
1262 /*
1263  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1264  * @this: move this
1265  * @to: to here
1266  *
1267  * Follow @to back to the root and make sure we don't encounter @this
1268  * Assumes we already hold the rename lock.
1269  *
1270  * Returns: errno
1271  */
1272
1273 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1274 {
1275         struct inode *dir = &to->i_inode;
1276         struct super_block *sb = dir->i_sb;
1277         struct inode *tmp;
1278         int error = 0;
1279
1280         igrab(dir);
1281
1282         for (;;) {
1283                 if (dir == &this->i_inode) {
1284                         error = -EINVAL;
1285                         break;
1286                 }
1287                 if (dir == d_inode(sb->s_root)) {
1288                         error = 0;
1289                         break;
1290                 }
1291
1292                 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1293                 if (!tmp) {
1294                         error = -ENOENT;
1295                         break;
1296                 }
1297                 if (IS_ERR(tmp)) {
1298                         error = PTR_ERR(tmp);
1299                         break;
1300                 }
1301
1302                 iput(dir);
1303                 dir = tmp;
1304         }
1305
1306         iput(dir);
1307
1308         return error;
1309 }
1310
1311 /**
1312  * update_moved_ino - Update an inode that's being moved
1313  * @ip: The inode being moved
1314  * @ndip: The parent directory of the new filename
1315  * @dir_rename: True of ip is a directory
1316  *
1317  * Returns: errno
1318  */
1319
1320 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1321                             int dir_rename)
1322 {
1323         if (dir_rename)
1324                 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1325
1326         ip->i_inode.i_ctime = current_time(&ip->i_inode);
1327         mark_inode_dirty_sync(&ip->i_inode);
1328         return 0;
1329 }
1330
1331
1332 /**
1333  * gfs2_rename - Rename a file
1334  * @odir: Parent directory of old file name
1335  * @odentry: The old dentry of the file
1336  * @ndir: Parent directory of new file name
1337  * @ndentry: The new dentry of the file
1338  *
1339  * Returns: errno
1340  */
1341
1342 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1343                        struct inode *ndir, struct dentry *ndentry)
1344 {
1345         struct gfs2_inode *odip = GFS2_I(odir);
1346         struct gfs2_inode *ndip = GFS2_I(ndir);
1347         struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1348         struct gfs2_inode *nip = NULL;
1349         struct gfs2_sbd *sdp = GFS2_SB(odir);
1350         struct gfs2_holder ghs[4], r_gh, rd_gh;
1351         struct gfs2_rgrpd *nrgd;
1352         unsigned int num_gh;
1353         int dir_rename = 0;
1354         struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1355         unsigned int x;
1356         int error;
1357
1358         gfs2_holder_mark_uninitialized(&r_gh);
1359         gfs2_holder_mark_uninitialized(&rd_gh);
1360         if (d_really_is_positive(ndentry)) {
1361                 nip = GFS2_I(d_inode(ndentry));
1362                 if (ip == nip)
1363                         return 0;
1364         }
1365
1366         error = gfs2_rindex_update(sdp);
1367         if (error)
1368                 return error;
1369
1370         error = gfs2_qa_get(ndip);
1371         if (error)
1372                 return error;
1373
1374         if (odip != ndip) {
1375                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1376                                            0, &r_gh);
1377                 if (error)
1378                         goto out;
1379
1380                 if (S_ISDIR(ip->i_inode.i_mode)) {
1381                         dir_rename = 1;
1382                         /* don't move a directory into its subdir */
1383                         error = gfs2_ok_to_move(ip, ndip);
1384                         if (error)
1385                                 goto out_gunlock_r;
1386                 }
1387         }
1388
1389         num_gh = 1;
1390         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1391         if (odip != ndip) {
1392                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1393                                  ghs + num_gh);
1394                 num_gh++;
1395         }
1396         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1397         num_gh++;
1398
1399         if (nip) {
1400                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1401                                  ghs + num_gh);
1402                 num_gh++;
1403         }
1404
1405         for (x = 0; x < num_gh; x++) {
1406                 error = gfs2_glock_nq(ghs + x);
1407                 if (error)
1408                         goto out_gunlock;
1409         }
1410         error = gfs2_glock_async_wait(num_gh, ghs);
1411         if (error)
1412                 goto out_gunlock;
1413
1414         if (nip) {
1415                 /* Grab the resource group glock for unlink flag twiddling.
1416                  * This is the case where the target dinode already exists
1417                  * so we unlink before doing the rename.
1418                  */
1419                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1420                 if (!nrgd) {
1421                         error = -ENOENT;
1422                         goto out_gunlock;
1423                 }
1424                 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1425                                            &rd_gh);
1426                 if (error)
1427                         goto out_gunlock;
1428         }
1429
1430         error = -ENOENT;
1431         if (ip->i_inode.i_nlink == 0)
1432                 goto out_gunlock;
1433
1434         /* Check out the old directory */
1435
1436         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1437         if (error)
1438                 goto out_gunlock;
1439
1440         /* Check out the new directory */
1441
1442         if (nip) {
1443                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1444                 if (error)
1445                         goto out_gunlock;
1446
1447                 if (nip->i_inode.i_nlink == 0) {
1448                         error = -EAGAIN;
1449                         goto out_gunlock;
1450                 }
1451
1452                 if (S_ISDIR(nip->i_inode.i_mode)) {
1453                         if (nip->i_entries < 2) {
1454                                 gfs2_consist_inode(nip);
1455                                 error = -EIO;
1456                                 goto out_gunlock;
1457                         }
1458                         if (nip->i_entries > 2) {
1459                                 error = -ENOTEMPTY;
1460                                 goto out_gunlock;
1461                         }
1462                 }
1463         } else {
1464                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1465                 if (error)
1466                         goto out_gunlock;
1467
1468                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1469                 switch (error) {
1470                 case -ENOENT:
1471                         error = 0;
1472                         break;
1473                 case 0:
1474                         error = -EEXIST;
1475                 default:
1476                         goto out_gunlock;
1477                 }
1478
1479                 if (odip != ndip) {
1480                         if (!ndip->i_inode.i_nlink) {
1481                                 error = -ENOENT;
1482                                 goto out_gunlock;
1483                         }
1484                         if (ndip->i_entries == (u32)-1) {
1485                                 error = -EFBIG;
1486                                 goto out_gunlock;
1487                         }
1488                         if (S_ISDIR(ip->i_inode.i_mode) &&
1489                             ndip->i_inode.i_nlink == (u32)-1) {
1490                                 error = -EMLINK;
1491                                 goto out_gunlock;
1492                         }
1493                 }
1494         }
1495
1496         /* Check out the dir to be renamed */
1497
1498         if (dir_rename) {
1499                 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1500                 if (error)
1501                         goto out_gunlock;
1502         }
1503
1504         if (nip == NULL) {
1505                 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1506                 if (error)
1507                         goto out_gunlock;
1508         }
1509
1510         if (da.nr_blocks) {
1511                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1512                 error = gfs2_quota_lock_check(ndip, &ap);
1513                 if (error)
1514                         goto out_gunlock;
1515
1516                 error = gfs2_inplace_reserve(ndip, &ap);
1517                 if (error)
1518                         goto out_gunlock_q;
1519
1520                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1521                                          4 * RES_LEAF + 4, 0);
1522                 if (error)
1523                         goto out_ipreserv;
1524         } else {
1525                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1526                                          5 * RES_LEAF + 4, 0);
1527                 if (error)
1528                         goto out_gunlock;
1529         }
1530
1531         /* Remove the target file, if it exists */
1532
1533         if (nip)
1534                 error = gfs2_unlink_inode(ndip, ndentry);
1535
1536         error = update_moved_ino(ip, ndip, dir_rename);
1537         if (error)
1538                 goto out_end_trans;
1539
1540         error = gfs2_dir_del(odip, odentry);
1541         if (error)
1542                 goto out_end_trans;
1543
1544         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1545         if (error)
1546                 goto out_end_trans;
1547
1548 out_end_trans:
1549         gfs2_trans_end(sdp);
1550 out_ipreserv:
1551         if (da.nr_blocks)
1552                 gfs2_inplace_release(ndip);
1553 out_gunlock_q:
1554         if (da.nr_blocks)
1555                 gfs2_quota_unlock(ndip);
1556 out_gunlock:
1557         gfs2_dir_no_add(&da);
1558         if (gfs2_holder_initialized(&rd_gh))
1559                 gfs2_glock_dq_uninit(&rd_gh);
1560
1561         while (x--) {
1562                 if (gfs2_holder_queued(ghs + x))
1563                         gfs2_glock_dq(ghs + x);
1564                 gfs2_holder_uninit(ghs + x);
1565         }
1566 out_gunlock_r:
1567         if (gfs2_holder_initialized(&r_gh))
1568                 gfs2_glock_dq_uninit(&r_gh);
1569 out:
1570         gfs2_qa_put(ndip);
1571         return error;
1572 }
1573
1574 /**
1575  * gfs2_exchange - exchange two files
1576  * @odir: Parent directory of old file name
1577  * @odentry: The old dentry of the file
1578  * @ndir: Parent directory of new file name
1579  * @ndentry: The new dentry of the file
1580  * @flags: The rename flags
1581  *
1582  * Returns: errno
1583  */
1584
1585 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1586                          struct inode *ndir, struct dentry *ndentry,
1587                          unsigned int flags)
1588 {
1589         struct gfs2_inode *odip = GFS2_I(odir);
1590         struct gfs2_inode *ndip = GFS2_I(ndir);
1591         struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1592         struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1593         struct gfs2_sbd *sdp = GFS2_SB(odir);
1594         struct gfs2_holder ghs[4], r_gh;
1595         unsigned int num_gh;
1596         unsigned int x;
1597         umode_t old_mode = oip->i_inode.i_mode;
1598         umode_t new_mode = nip->i_inode.i_mode;
1599         int error;
1600
1601         gfs2_holder_mark_uninitialized(&r_gh);
1602         error = gfs2_rindex_update(sdp);
1603         if (error)
1604                 return error;
1605
1606         if (odip != ndip) {
1607                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1608                                            0, &r_gh);
1609                 if (error)
1610                         goto out;
1611
1612                 if (S_ISDIR(old_mode)) {
1613                         /* don't move a directory into its subdir */
1614                         error = gfs2_ok_to_move(oip, ndip);
1615                         if (error)
1616                                 goto out_gunlock_r;
1617                 }
1618
1619                 if (S_ISDIR(new_mode)) {
1620                         /* don't move a directory into its subdir */
1621                         error = gfs2_ok_to_move(nip, odip);
1622                         if (error)
1623                                 goto out_gunlock_r;
1624                 }
1625         }
1626
1627         num_gh = 1;
1628         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1629         if (odip != ndip) {
1630                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1631                                  ghs + num_gh);
1632                 num_gh++;
1633         }
1634         gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1635         num_gh++;
1636
1637         gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1638         num_gh++;
1639
1640         for (x = 0; x < num_gh; x++) {
1641                 error = gfs2_glock_nq(ghs + x);
1642                 if (error)
1643                         goto out_gunlock;
1644         }
1645
1646         error = gfs2_glock_async_wait(num_gh, ghs);
1647         if (error)
1648                 goto out_gunlock;
1649
1650         error = -ENOENT;
1651         if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1652                 goto out_gunlock;
1653
1654         error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1655         if (error)
1656                 goto out_gunlock;
1657         error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1658         if (error)
1659                 goto out_gunlock;
1660
1661         if (S_ISDIR(old_mode)) {
1662                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1663                 if (error)
1664                         goto out_gunlock;
1665         }
1666         if (S_ISDIR(new_mode)) {
1667                 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1668                 if (error)
1669                         goto out_gunlock;
1670         }
1671         error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1672         if (error)
1673                 goto out_gunlock;
1674
1675         error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1676         if (error)
1677                 goto out_end_trans;
1678
1679         error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1680         if (error)
1681                 goto out_end_trans;
1682
1683         error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1684                                IF2DT(old_mode));
1685         if (error)
1686                 goto out_end_trans;
1687
1688         error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1689                                IF2DT(new_mode));
1690         if (error)
1691                 goto out_end_trans;
1692
1693         if (odip != ndip) {
1694                 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1695                         inc_nlink(&odip->i_inode);
1696                         drop_nlink(&ndip->i_inode);
1697                 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1698                         inc_nlink(&ndip->i_inode);
1699                         drop_nlink(&odip->i_inode);
1700                 }
1701         }
1702         mark_inode_dirty(&ndip->i_inode);
1703         if (odip != ndip)
1704                 mark_inode_dirty(&odip->i_inode);
1705
1706 out_end_trans:
1707         gfs2_trans_end(sdp);
1708 out_gunlock:
1709         while (x--) {
1710                 if (gfs2_holder_queued(ghs + x))
1711                         gfs2_glock_dq(ghs + x);
1712                 gfs2_holder_uninit(ghs + x);
1713         }
1714 out_gunlock_r:
1715         if (gfs2_holder_initialized(&r_gh))
1716                 gfs2_glock_dq_uninit(&r_gh);
1717 out:
1718         return error;
1719 }
1720
1721 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1722                         struct inode *ndir, struct dentry *ndentry,
1723                         unsigned int flags)
1724 {
1725         flags &= ~RENAME_NOREPLACE;
1726
1727         if (flags & ~RENAME_EXCHANGE)
1728                 return -EINVAL;
1729
1730         if (flags & RENAME_EXCHANGE)
1731                 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1732
1733         return gfs2_rename(odir, odentry, ndir, ndentry);
1734 }
1735
1736 /**
1737  * gfs2_get_link - Follow a symbolic link
1738  * @dentry: The dentry of the link
1739  * @inode: The inode of the link
1740  * @done: destructor for return value
1741  *
1742  * This can handle symlinks of any size.
1743  *
1744  * Returns: 0 on success or error code
1745  */
1746
1747 static const char *gfs2_get_link(struct dentry *dentry,
1748                                  struct inode *inode,
1749                                  struct delayed_call *done)
1750 {
1751         struct gfs2_inode *ip = GFS2_I(inode);
1752         struct gfs2_holder i_gh;
1753         struct buffer_head *dibh;
1754         unsigned int size;
1755         char *buf;
1756         int error;
1757
1758         if (!dentry)
1759                 return ERR_PTR(-ECHILD);
1760
1761         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1762         error = gfs2_glock_nq(&i_gh);
1763         if (error) {
1764                 gfs2_holder_uninit(&i_gh);
1765                 return ERR_PTR(error);
1766         }
1767
1768         size = (unsigned int)i_size_read(&ip->i_inode);
1769         if (size == 0) {
1770                 gfs2_consist_inode(ip);
1771                 buf = ERR_PTR(-EIO);
1772                 goto out;
1773         }
1774
1775         error = gfs2_meta_inode_buffer(ip, &dibh);
1776         if (error) {
1777                 buf = ERR_PTR(error);
1778                 goto out;
1779         }
1780
1781         buf = kzalloc(size + 1, GFP_NOFS);
1782         if (!buf)
1783                 buf = ERR_PTR(-ENOMEM);
1784         else
1785                 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1786         brelse(dibh);
1787 out:
1788         gfs2_glock_dq_uninit(&i_gh);
1789         if (!IS_ERR(buf))
1790                 set_delayed_call(done, kfree_link, buf);
1791         return buf;
1792 }
1793
1794 /**
1795  * gfs2_permission -
1796  * @inode: The inode
1797  * @mask: The mask to be tested
1798  * @flags: Indicates whether this is an RCU path walk or not
1799  *
1800  * This may be called from the VFS directly, or from within GFS2 with the
1801  * inode locked, so we look to see if the glock is already locked and only
1802  * lock the glock if its not already been done.
1803  *
1804  * Returns: errno
1805  */
1806
1807 int gfs2_permission(struct inode *inode, int mask)
1808 {
1809         struct gfs2_inode *ip;
1810         struct gfs2_holder i_gh;
1811         int error;
1812
1813         gfs2_holder_mark_uninitialized(&i_gh);
1814         ip = GFS2_I(inode);
1815         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1816                 if (mask & MAY_NOT_BLOCK)
1817                         return -ECHILD;
1818                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1819                 if (error)
1820                         return error;
1821         }
1822
1823         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1824                 error = -EPERM;
1825         else
1826                 error = generic_permission(inode, mask);
1827         if (gfs2_holder_initialized(&i_gh))
1828                 gfs2_glock_dq_uninit(&i_gh);
1829
1830         return error;
1831 }
1832
1833 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1834 {
1835         setattr_copy(inode, attr);
1836         mark_inode_dirty(inode);
1837         return 0;
1838 }
1839
1840 /**
1841  * gfs2_setattr_simple -
1842  * @ip:
1843  * @attr:
1844  *
1845  * Returns: errno
1846  */
1847
1848 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1849 {
1850         int error;
1851
1852         if (current->journal_info)
1853                 return __gfs2_setattr_simple(inode, attr);
1854
1855         error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1856         if (error)
1857                 return error;
1858
1859         error = __gfs2_setattr_simple(inode, attr);
1860         gfs2_trans_end(GFS2_SB(inode));
1861         return error;
1862 }
1863
1864 static int setattr_chown(struct inode *inode, struct iattr *attr)
1865 {
1866         struct gfs2_inode *ip = GFS2_I(inode);
1867         struct gfs2_sbd *sdp = GFS2_SB(inode);
1868         kuid_t ouid, nuid;
1869         kgid_t ogid, ngid;
1870         int error;
1871         struct gfs2_alloc_parms ap;
1872
1873         ouid = inode->i_uid;
1874         ogid = inode->i_gid;
1875         nuid = attr->ia_uid;
1876         ngid = attr->ia_gid;
1877
1878         if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1879                 ouid = nuid = NO_UID_QUOTA_CHANGE;
1880         if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1881                 ogid = ngid = NO_GID_QUOTA_CHANGE;
1882         error = gfs2_qa_get(ip);
1883         if (error)
1884                 return error;
1885
1886         error = gfs2_rindex_update(sdp);
1887         if (error)
1888                 goto out;
1889
1890         error = gfs2_quota_lock(ip, nuid, ngid);
1891         if (error)
1892                 goto out;
1893
1894         ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1895
1896         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1897             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1898                 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1899                 if (error)
1900                         goto out_gunlock_q;
1901         }
1902
1903         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1904         if (error)
1905                 goto out_gunlock_q;
1906
1907         error = gfs2_setattr_simple(inode, attr);
1908         if (error)
1909                 goto out_end_trans;
1910
1911         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1912             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1913                 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1914                 gfs2_quota_change(ip, ap.target, nuid, ngid);
1915         }
1916
1917 out_end_trans:
1918         gfs2_trans_end(sdp);
1919 out_gunlock_q:
1920         gfs2_quota_unlock(ip);
1921 out:
1922         gfs2_qa_put(ip);
1923         return error;
1924 }
1925
1926 /**
1927  * gfs2_setattr - Change attributes on an inode
1928  * @dentry: The dentry which is changing
1929  * @attr: The structure describing the change
1930  *
1931  * The VFS layer wants to change one or more of an inodes attributes.  Write
1932  * that change out to disk.
1933  *
1934  * Returns: errno
1935  */
1936
1937 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1938 {
1939         struct inode *inode = d_inode(dentry);
1940         struct gfs2_inode *ip = GFS2_I(inode);
1941         struct gfs2_holder i_gh;
1942         int error;
1943
1944         error = gfs2_qa_get(ip);
1945         if (error)
1946                 return error;
1947
1948         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1949         if (error)
1950                 goto out;
1951
1952         error = -EPERM;
1953         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1954                 goto error;
1955
1956         error = setattr_prepare(dentry, attr);
1957         if (error)
1958                 goto error;
1959
1960         if (attr->ia_valid & ATTR_SIZE)
1961                 error = gfs2_setattr_size(inode, attr->ia_size);
1962         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1963                 error = setattr_chown(inode, attr);
1964         else {
1965                 error = gfs2_setattr_simple(inode, attr);
1966                 if (!error && attr->ia_valid & ATTR_MODE)
1967                         error = posix_acl_chmod(inode, inode->i_mode);
1968         }
1969
1970 error:
1971         if (!error)
1972                 mark_inode_dirty(inode);
1973         gfs2_glock_dq_uninit(&i_gh);
1974 out:
1975         gfs2_qa_put(ip);
1976         return error;
1977 }
1978
1979 /**
1980  * gfs2_getattr - Read out an inode's attributes
1981  * @path: Object to query
1982  * @stat: The inode's stats
1983  * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1984  * @flags: AT_STATX_xxx setting
1985  *
1986  * This may be called from the VFS directly, or from within GFS2 with the
1987  * inode locked, so we look to see if the glock is already locked and only
1988  * lock the glock if its not already been done. Note that its the NFS
1989  * readdirplus operation which causes this to be called (from filldir)
1990  * with the glock already held.
1991  *
1992  * Returns: errno
1993  */
1994
1995 static int gfs2_getattr(const struct path *path, struct kstat *stat,
1996                         u32 request_mask, unsigned int flags)
1997 {
1998         struct inode *inode = d_inode(path->dentry);
1999         struct gfs2_inode *ip = GFS2_I(inode);
2000         struct gfs2_holder gh;
2001         u32 gfsflags;
2002         int error;
2003
2004         gfs2_holder_mark_uninitialized(&gh);
2005         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2006                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2007                 if (error)
2008                         return error;
2009         }
2010
2011         gfsflags = ip->i_diskflags;
2012         if (gfsflags & GFS2_DIF_APPENDONLY)
2013                 stat->attributes |= STATX_ATTR_APPEND;
2014         if (gfsflags & GFS2_DIF_IMMUTABLE)
2015                 stat->attributes |= STATX_ATTR_IMMUTABLE;
2016
2017         stat->attributes_mask |= (STATX_ATTR_APPEND |
2018                                   STATX_ATTR_COMPRESSED |
2019                                   STATX_ATTR_ENCRYPTED |
2020                                   STATX_ATTR_IMMUTABLE |
2021                                   STATX_ATTR_NODUMP);
2022
2023         generic_fillattr(inode, stat);
2024
2025         if (gfs2_holder_initialized(&gh))
2026                 gfs2_glock_dq_uninit(&gh);
2027
2028         return 0;
2029 }
2030
2031 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2032                        u64 start, u64 len)
2033 {
2034         struct gfs2_inode *ip = GFS2_I(inode);
2035         struct gfs2_holder gh;
2036         int ret;
2037
2038         inode_lock_shared(inode);
2039
2040         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2041         if (ret)
2042                 goto out;
2043
2044         ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2045
2046         gfs2_glock_dq_uninit(&gh);
2047
2048 out:
2049         inode_unlock_shared(inode);
2050         return ret;
2051 }
2052
2053 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2054 {
2055         struct inode *inode = file->f_mapping->host;
2056         struct gfs2_inode *ip = GFS2_I(inode);
2057         struct gfs2_holder gh;
2058         loff_t ret;
2059
2060         inode_lock_shared(inode);
2061         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2062         if (!ret)
2063                 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2064         gfs2_glock_dq_uninit(&gh);
2065         inode_unlock_shared(inode);
2066
2067         if (ret < 0)
2068                 return ret;
2069         return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2070 }
2071
2072 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2073 {
2074         struct inode *inode = file->f_mapping->host;
2075         struct gfs2_inode *ip = GFS2_I(inode);
2076         struct gfs2_holder gh;
2077         loff_t ret;
2078
2079         inode_lock_shared(inode);
2080         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2081         if (!ret)
2082                 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2083         gfs2_glock_dq_uninit(&gh);
2084         inode_unlock_shared(inode);
2085
2086         if (ret < 0)
2087                 return ret;
2088         return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2089 }
2090
2091 const struct inode_operations gfs2_file_iops = {
2092         .permission = gfs2_permission,
2093         .setattr = gfs2_setattr,
2094         .getattr = gfs2_getattr,
2095         .listxattr = gfs2_listxattr,
2096         .fiemap = gfs2_fiemap,
2097         .get_acl = gfs2_get_acl,
2098         .set_acl = gfs2_set_acl,
2099 };
2100
2101 const struct inode_operations gfs2_dir_iops = {
2102         .create = gfs2_create,
2103         .lookup = gfs2_lookup,
2104         .link = gfs2_link,
2105         .unlink = gfs2_unlink,
2106         .symlink = gfs2_symlink,
2107         .mkdir = gfs2_mkdir,
2108         .rmdir = gfs2_unlink,
2109         .mknod = gfs2_mknod,
2110         .rename = gfs2_rename2,
2111         .permission = gfs2_permission,
2112         .setattr = gfs2_setattr,
2113         .getattr = gfs2_getattr,
2114         .listxattr = gfs2_listxattr,
2115         .fiemap = gfs2_fiemap,
2116         .get_acl = gfs2_get_acl,
2117         .set_acl = gfs2_set_acl,
2118         .atomic_open = gfs2_atomic_open,
2119 };
2120
2121 const struct inode_operations gfs2_symlink_iops = {
2122         .get_link = gfs2_get_link,
2123         .permission = gfs2_permission,
2124         .setattr = gfs2_setattr,
2125         .getattr = gfs2_getattr,
2126         .listxattr = gfs2_listxattr,
2127         .fiemap = gfs2_fiemap,
2128 };
2129