fs/gfs2/inode.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/namei.h>
  15 #include <linux/mm.h>
  16 #include <linux/xattr.h>
  17 #include <linux/posix_acl.h>
  18 #include <linux/gfs2_ondisk.h>
  19 #include <linux/crc32.h>
  20 #include <linux/fiemap.h>
  21 #include <linux/security.h>
  22 #include <asm/uaccess.h>
  23
  24 #include "gfs2.h"
  25 #include "incore.h"
  26 #include "acl.h"
  27 #include "bmap.h"
  28 #include "dir.h"
  29 #include "xattr.h"
  30 #include "glock.h"
  31 #include "inode.h"
  32 #include "meta_io.h"
  33 #include "quota.h"
  34 #include "rgrp.h"
  35 #include "trans.h"
  36 #include "util.h"
  37 #include "super.h"
  38 #include "glops.h"
  39
  40 struct gfs2_skip_data {
  41         u64 no_addr;
  42         int skipped;
  43         int non_block;
  44 };
  45
  46 static int iget_test(struct inode *inode, void *opaque)
  47 {
  48         struct gfs2_inode *ip = GFS2_I(inode);
  49         struct gfs2_skip_data *data = opaque;
  50
  51         if (ip->i_no_addr == data->no_addr) {
  52                 if (data->non_block &&
  53                     inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
  54                         data->skipped = 1;
  55                         return 0;
  56                 }
  57                 return 1;
  58         }
  59         return 0;
  60 }
  61
  62 static int iget_set(struct inode *inode, void *opaque)
  63 {
  64         struct gfs2_inode *ip = GFS2_I(inode);
  65         struct gfs2_skip_data *data = opaque;
  66
  67         if (data->skipped)
  68                 return -ENOENT;
  69         inode->i_ino = (unsigned long)(data->no_addr);
  70         ip->i_no_addr = data->no_addr;
  71         return 0;
  72 }
  73
  74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
  75 {
  76         unsigned long hash = (unsigned long)no_addr;
  77         struct gfs2_skip_data data;
  78
  79         data.no_addr = no_addr;
  80         data.skipped = 0;
  81         data.non_block = non_block;
  82         return ilookup5(sb, hash, iget_test, &data);
  83 }
  84
  85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
  86                                int non_block)
  87 {
  88         struct gfs2_skip_data data;
  89         unsigned long hash = (unsigned long)no_addr;
  90
  91         data.no_addr = no_addr;
  92         data.skipped = 0;
  93         data.non_block = non_block;
  94         return iget5_locked(sb, hash, iget_test, iget_set, &data);
  95 }
  96
  97 /**
  98  * gfs2_set_iop - Sets inode operations
  99  * @inode: The inode with correct i_mode filled in
 100  *
 101  * GFS2 lookup code fills in vfs inode contents based on info obtained
 102  * from directory entry inside gfs2_inode_lookup().
 103  */
 104
 105 static void gfs2_set_iop(struct inode *inode)
 106 {
 107         struct gfs2_sbd *sdp = GFS2_SB(inode);
 108         umode_t mode = inode->i_mode;
 109
 110         if (S_ISREG(mode)) {
 111                 inode->i_op = &gfs2_file_iops;
 112                 if (gfs2_localflocks(sdp))
 113                         inode->i_fop = &gfs2_file_fops_nolock;
 114                 else
 115                         inode->i_fop = &gfs2_file_fops;
 116         } else if (S_ISDIR(mode)) {
 117                 inode->i_op = &gfs2_dir_iops;
 118                 if (gfs2_localflocks(sdp))
 119                         inode->i_fop = &gfs2_dir_fops_nolock;
 120                 else
 121                         inode->i_fop = &gfs2_dir_fops;
 122         } else if (S_ISLNK(mode)) {
 123                 inode->i_op = &gfs2_symlink_iops;
 124         } else {
 125                 inode->i_op = &gfs2_file_iops;
 126                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 127         }
 128 }
 129
 130 /**
 131  * gfs2_inode_lookup - Lookup an inode
 132  * @sb: The super block
 133  * @no_addr: The inode number
 134  * @type: The type of the inode
 135  * non_block: Can we block on inodes that are being freed?
 136  *
 137  * Returns: A VFS inode, or an error
 138  */
 139
 140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 141                                 u64 no_addr, u64 no_formal_ino, int non_block)
 142 {
 143         struct inode *inode;
 144         struct gfs2_inode *ip;
 145         struct gfs2_glock *io_gl = NULL;
 146         int error;
 147
 148         inode = gfs2_iget(sb, no_addr, non_block);
 149         ip = GFS2_I(inode);
 150
 151         if (!inode)
 152                 return ERR_PTR(-ENOMEM);
 153
 154         if (inode->i_state & I_NEW) {
 155                 struct gfs2_sbd *sdp = GFS2_SB(inode);
 156                 ip->i_no_formal_ino = no_formal_ino;
 157
 158                 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 159                 if (unlikely(error))
 160                         goto fail;
 161                 ip->i_gl->gl_object = ip;
 162
 163                 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 164                 if (unlikely(error))
 165                         goto fail_put;
 166
 167                 set_bit(GIF_INVALID, &ip->i_flags);
 168                 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 169                 if (unlikely(error))
 170                         goto fail_iopen;
 171
 172                 ip->i_iopen_gh.gh_gl->gl_object = ip;
 173                 gfs2_glock_put(io_gl);
 174                 io_gl = NULL;
 175
 176                 if (type == DT_UNKNOWN) {
 177                         /* Inode glock must be locked already */
 178                         error = gfs2_inode_refresh(GFS2_I(inode));
 179                         if (error)
 180                                 goto fail_refresh;
 181                 } else {
 182                         inode->i_mode = DT2IF(type);
 183                 }
 184
 185                 gfs2_set_iop(inode);
 186                 unlock_new_inode(inode);
 187         }
 188
 189         return inode;
 190
 191 fail_refresh:
 192         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
 193         ip->i_iopen_gh.gh_gl->gl_object = NULL;
 194         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 195 fail_iopen:
 196         if (io_gl)
 197                 gfs2_glock_put(io_gl);
 198 fail_put:
 199         ip->i_gl->gl_object = NULL;
 200         gfs2_glock_put(ip->i_gl);
 201 fail:
 202         iget_failed(inode);
 203         return ERR_PTR(error);
 204 }
 205
 206 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 207                                   u64 *no_formal_ino, unsigned int blktype)
 208 {
 209         struct super_block *sb = sdp->sd_vfs;
 210         struct gfs2_holder i_gh;
 211         struct inode *inode = NULL;
 212         int error;
 213
 214         /* Must not read in block until block type is verified */
 215         error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
 216                                   LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
 217         if (error)
 218                 return ERR_PTR(error);
 219
 220         error = gfs2_check_blk_type(sdp, no_addr, blktype);
 221         if (error)
 222                 goto fail;
 223
 224         inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
 225         if (IS_ERR(inode))
 226                 goto fail;
 227
 228         /* Two extra checks for NFS only */
 229         if (no_formal_ino) {
 230                 error = -ESTALE;
 231                 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
 232                         goto fail_iput;
 233
 234                 error = -EIO;
 235                 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
 236                         goto fail_iput;
 237
 238                 error = 0;
 239         }
 240
 241 fail:
 242         gfs2_glock_dq_uninit(&i_gh);
 243         return error ? ERR_PTR(error) : inode;
 244 fail_iput:
 245         iput(inode);
 246         goto fail;
 247 }
 248
 249
 250 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
 251 {
 252         struct qstr qstr;
 253         struct inode *inode;
 254         gfs2_str2qstr(&qstr, name);
 255         inode = gfs2_lookupi(dip, &qstr, 1);
 256         /* gfs2_lookupi has inconsistent callers: vfs
 257          * related routines expect NULL for no entry found,
 258          * gfs2_lookup_simple callers expect ENOENT
 259          * and do not check for NULL.
 260          */
 261         if (inode == NULL)
 262                 return ERR_PTR(-ENOENT);
 263         else
 264                 return inode;
 265 }
 266
 267
 268 /**
 269  * gfs2_lookupi - Look up a filename in a directory and return its inode
 270  * @d_gh: An initialized holder for the directory glock
 271  * @name: The name of the inode to look for
 272  * @is_root: If 1, ignore the caller's permissions
 273  * @i_gh: An uninitialized holder for the new inode glock
 274  *
 275  * This can be called via the VFS filldir function when NFS is doing
 276  * a readdirplus and the inode which its intending to stat isn't
 277  * already in cache. In this case we must not take the directory glock
 278  * again, since the readdir call will have already taken that lock.
 279  *
 280  * Returns: errno
 281  */
 282
 283 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 284                            int is_root)
 285 {
 286         struct super_block *sb = dir->i_sb;
 287         struct gfs2_inode *dip = GFS2_I(dir);
 288         struct gfs2_holder d_gh;
 289         int error = 0;
 290         struct inode *inode = NULL;
 291         int unlock = 0;
 292
 293         if (!name->len || name->len > GFS2_FNAMESIZE)
 294                 return ERR_PTR(-ENAMETOOLONG);
 295
 296         if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
 297             (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
 298              dir == d_inode(sb->s_root))) {
 299                 igrab(dir);
 300                 return dir;
 301         }
 302
 303         if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
 304                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
 305                 if (error)
 306                         return ERR_PTR(error);
 307                 unlock = 1;
 308         }
 309
 310         if (!is_root) {
 311                 error = gfs2_permission(dir, MAY_EXEC);
 312                 if (error)
 313                         goto out;
 314         }
 315
 316         inode = gfs2_dir_search(dir, name, false);
 317         if (IS_ERR(inode))
 318                 error = PTR_ERR(inode);
 319 out:
 320         if (unlock)
 321                 gfs2_glock_dq_uninit(&d_gh);
 322         if (error == -ENOENT)
 323                 return NULL;
 324         return inode ? inode : ERR_PTR(error);
 325 }
 326
 327 /**
 328  * create_ok - OK to create a new on-disk inode here?
 329  * @dip:  Directory in which dinode is to be created
 330  * @name:  Name of new dinode
 331  * @mode:
 332  *
 333  * Returns: errno
 334  */
 335
 336 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 337                      umode_t mode)
 338 {
 339         int error;
 340
 341         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
 342         if (error)
 343                 return error;
 344
 345         /*  Don't create entries in an unlinked directory  */
 346         if (!dip->i_inode.i_nlink)
 347                 return -ENOENT;
 348
 349         if (dip->i_entries == (u32)-1)
 350                 return -EFBIG;
 351         if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
 352                 return -EMLINK;
 353
 354         return 0;
 355 }
 356
 357 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
 358                                struct inode *inode)
 359 {
 360         if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
 361             (dip->i_inode.i_mode & S_ISUID) &&
 362             !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
 363                 if (S_ISDIR(inode->i_mode))
 364                         inode->i_mode |= S_ISUID;
 365                 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
 366                         inode->i_mode &= ~07111;
 367                 inode->i_uid = dip->i_inode.i_uid;
 368         } else
 369                 inode->i_uid = current_fsuid();
 370
 371         if (dip->i_inode.i_mode & S_ISGID) {
 372                 if (S_ISDIR(inode->i_mode))
 373                         inode->i_mode |= S_ISGID;
 374                 inode->i_gid = dip->i_inode.i_gid;
 375         } else
 376                 inode->i_gid = current_fsgid();
 377 }
 378
 379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
 380 {
 381         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 382         struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
 383         int error;
 384
 385         error = gfs2_quota_lock_check(ip, &ap);
 386         if (error)
 387                 goto out;
 388
 389         error = gfs2_inplace_reserve(ip, &ap);
 390         if (error)
 391                 goto out_quota;
 392
 393         error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
 394         if (error)
 395                 goto out_ipreserv;
 396
 397         error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
 398         ip->i_no_formal_ino = ip->i_generation;
 399         ip->i_inode.i_ino = ip->i_no_addr;
 400         ip->i_goal = ip->i_no_addr;
 401
 402         gfs2_trans_end(sdp);
 403
 404 out_ipreserv:
 405         gfs2_inplace_release(ip);
 406 out_quota:
 407         gfs2_quota_unlock(ip);
 408 out:
 409         return error;
 410 }
 411
 412 static void gfs2_init_dir(struct buffer_head *dibh,
 413                           const struct gfs2_inode *parent)
 414 {
 415         struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 416         struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 417
 418         gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
 419         dent->de_inum = di->di_num; /* already GFS2 endian */
 420         dent->de_type = cpu_to_be16(DT_DIR);
 421
 422         dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 423         gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 424         gfs2_inum_out(parent, dent);
 425         dent->de_type = cpu_to_be16(DT_DIR);
 426
 427 }
 428
 429 /**
 430  * gfs2_init_xattr - Initialise an xattr block for a new inode
 431  * @ip: The inode in question
 432  *
 433  * This sets up an empty xattr block for a new inode, ready to
 434  * take any ACLs, LSM xattrs, etc.
 435  */
 436
 437 static void gfs2_init_xattr(struct gfs2_inode *ip)
 438 {
 439         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 440         struct buffer_head *bh;
 441         struct gfs2_ea_header *ea;
 442
 443         bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
 444         gfs2_trans_add_meta(ip->i_gl, bh);
 445         gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 446         gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
 447
 448         ea = GFS2_EA_BH2FIRST(bh);
 449         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 450         ea->ea_type = GFS2_EATYPE_UNUSED;
 451         ea->ea_flags = GFS2_EAFLAG_LAST;
 452
 453         brelse(bh);
 454 }
 455
 456 /**
 457  * init_dinode - Fill in a new dinode structure
 458  * @dip: The directory this inode is being created in
 459  * @ip: The inode
 460  * @symname: The symlink destination (if a symlink)
 461  * @bhp: The buffer head (returned to caller)
 462  *
 463  */
 464
 465 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
 466                         const char *symname)
 467 {
 468         struct gfs2_dinode *di;
 469         struct buffer_head *dibh;
 470
 471         dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
 472         gfs2_trans_add_meta(ip->i_gl, dibh);
 473         di = (struct gfs2_dinode *)dibh->b_data;
 474         gfs2_dinode_out(ip, di);
 475
 476         di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
 477         di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
 478         di->__pad1 = 0;
 479         di->__pad2 = 0;
 480         di->__pad3 = 0;
 481         memset(&di->__pad4, 0, sizeof(di->__pad4));
 482         memset(&di->di_reserved, 0, sizeof(di->di_reserved));
 483         gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 484
 485         switch(ip->i_inode.i_mode & S_IFMT) {
 486         case S_IFDIR:
 487                 gfs2_init_dir(dibh, dip);
 488                 break;
 489         case S_IFLNK:
 490                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
 491                 break;
 492         }
 493
 494         set_buffer_uptodate(dibh);
 495         brelse(dibh);
 496 }
 497
 498 /**
 499  * gfs2_trans_da_blocks - Calculate number of blocks to link inode
 500  * @dip: The directory we are linking into
 501  * @da: The dir add information
 502  * @nr_inodes: The number of inodes involved
 503  *
 504  * This calculate the number of blocks we need to reserve in a
 505  * transaction to link @nr_inodes into a directory. In most cases
 506  * @nr_inodes will be 2 (the directory plus the inode being linked in)
 507  * but in case of rename, 4 may be required.
 508  *
 509  * Returns: Number of blocks
 510  */
 511
 512 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
 513                                    const struct gfs2_diradd *da,
 514                                    unsigned nr_inodes)
 515 {
 516         return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
 517                (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
 518 }
 519
 520 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
 521                        struct gfs2_inode *ip, struct gfs2_diradd *da)
 522 {
 523         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 524         struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
 525         int error;
 526
 527         if (da->nr_blocks) {
 528                 error = gfs2_quota_lock_check(dip, &ap);
 529                 if (error)
 530                         goto fail_quota_locks;
 531
 532                 error = gfs2_inplace_reserve(dip, &ap);
 533                 if (error)
 534                         goto fail_quota_locks;
 535
 536                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
 537                 if (error)
 538                         goto fail_ipreserv;
 539         } else {
 540                 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
 541                 if (error)
 542                         goto fail_quota_locks;
 543         }
 544
 545         error = gfs2_dir_add(&dip->i_inode, name, ip, da);
 546
 547         gfs2_trans_end(sdp);
 548 fail_ipreserv:
 549         gfs2_inplace_release(dip);
 550 fail_quota_locks:
 551         gfs2_quota_unlock(dip);
 552         return error;
 553 }
 554
 555 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 556                     void *fs_info)
 557 {
 558         const struct xattr *xattr;
 559         int err = 0;
 560
 561         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 562                 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
 563                                        xattr->value_len, 0,
 564                                        GFS2_EATYPE_SECURITY);
 565                 if (err < 0)
 566                         break;
 567         }
 568         return err;
 569 }
 570
 571 /**
 572  * gfs2_create_inode - Create a new inode
 573  * @dir: The parent directory
 574  * @dentry: The new dentry
 575  * @file: If non-NULL, the file which is being opened
 576  * @mode: The permissions on the new inode
 577  * @dev: For device nodes, this is the device number
 578  * @symname: For symlinks, this is the link destination
 579  * @size: The initial size of the inode (ignored for directories)
 580  *
 581  * Returns: 0 on success, or error code
 582  */
 583
 584 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 585                              struct file *file,
 586                              umode_t mode, dev_t dev, const char *symname,
 587                              unsigned int size, int excl, int *opened)
 588 {
 589         const struct qstr *name = &dentry->d_name;
 590         struct posix_acl *default_acl, *acl;
 591         struct gfs2_holder ghs[2];
 592         struct inode *inode = NULL;
 593         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 594         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 595         struct gfs2_glock *io_gl;
 596         int error, free_vfs_inode = 0;
 597         u32 aflags = 0;
 598         unsigned blocks = 1;
 599         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 600
 601         if (!name->len || name->len > GFS2_FNAMESIZE)
 602                 return -ENAMETOOLONG;
 603
 604         error = gfs2_rs_alloc(dip);
 605         if (error)
 606                 return error;
 607
 608         error = gfs2_rindex_update(sdp);
 609         if (error)
 610                 return error;
 611
 612         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 613         if (error)
 614                 goto fail;
 615
 616         error = create_ok(dip, name, mode);
 617         if (error)
 618                 goto fail_gunlock;
 619
 620         inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
 621         error = PTR_ERR(inode);
 622         if (!IS_ERR(inode)) {
 623                 if (S_ISDIR(inode->i_mode)) {
 624                         iput(inode);
 625                         inode = ERR_PTR(-EISDIR);
 626                         goto fail_gunlock;
 627                 }
 628                 d_instantiate(dentry, inode);
 629                 error = 0;
 630                 if (file) {
 631                         if (S_ISREG(inode->i_mode))
 632                                 error = finish_open(file, dentry, gfs2_open_common, opened);
 633                         else
 634                                 error = finish_no_open(file, NULL);
 635                 }
 636                 gfs2_glock_dq_uninit(ghs);
 637                 return error;
 638         } else if (error != -ENOENT) {
 639                 goto fail_gunlock;
 640         }
 641
 642         error = gfs2_diradd_alloc_required(dir, name, &da);
 643         if (error < 0)
 644                 goto fail_gunlock;
 645
 646         inode = new_inode(sdp->sd_vfs);
 647         error = -ENOMEM;
 648         if (!inode)
 649                 goto fail_gunlock;
 650
 651         error = posix_acl_create(dir, &mode, &default_acl, &acl);
 652         if (error)
 653                 goto fail_free_vfs_inode;
 654
 655         ip = GFS2_I(inode);
 656         error = gfs2_rs_alloc(ip);
 657         if (error)
 658                 goto fail_free_acls;
 659
 660         inode->i_mode = mode;
 661         set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
 662         inode->i_rdev = dev;
 663         inode->i_size = size;
 664         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 665         gfs2_set_inode_blocks(inode, 1);
 666         munge_mode_uid_gid(dip, inode);
 667         check_and_update_goal(dip);
 668         ip->i_goal = dip->i_goal;
 669         ip->i_diskflags = 0;
 670         ip->i_eattr = 0;
 671         ip->i_height = 0;
 672         ip->i_depth = 0;
 673         ip->i_entries = 0;
 674
 675         switch(mode & S_IFMT) {
 676         case S_IFREG:
 677                 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
 678                     gfs2_tune_get(sdp, gt_new_files_jdata))
 679                         ip->i_diskflags |= GFS2_DIF_JDATA;
 680                 gfs2_set_aops(inode);
 681                 break;
 682         case S_IFDIR:
 683                 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
 684                 ip->i_diskflags |= GFS2_DIF_JDATA;
 685                 ip->i_entries = 2;
 686                 break;
 687         }
 688         gfs2_set_inode_flags(inode);
 689
 690         if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
 691             (dip->i_diskflags & GFS2_DIF_TOPDIR))
 692                 aflags |= GFS2_AF_ORLOV;
 693
 694         if (default_acl || acl)
 695                 blocks++;
 696
 697         error = alloc_dinode(ip, aflags, &blocks);
 698         if (error)
 699                 goto fail_free_inode;
 700
 701         gfs2_set_inode_blocks(inode, blocks);
 702
 703         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 704         if (error)
 705                 goto fail_free_inode;
 706
 707         ip->i_gl->gl_object = ip;
 708         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
 709         if (error)
 710                 goto fail_free_inode;
 711
 712         error = gfs2_trans_begin(sdp, blocks, 0);
 713         if (error)
 714                 goto fail_gunlock2;
 715
 716         if (blocks > 1) {
 717                 ip->i_eattr = ip->i_no_addr + 1;
 718                 gfs2_init_xattr(ip);
 719         }
 720         init_dinode(dip, ip, symname);
 721         gfs2_trans_end(sdp);
 722
 723         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 724         if (error)
 725                 goto fail_gunlock2;
 726
 727         error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 728         if (error)
 729                 goto fail_gunlock2;
 730
 731         ip->i_iopen_gh.gh_gl->gl_object = ip;
 732         gfs2_glock_put(io_gl);
 733         gfs2_set_iop(inode);
 734         insert_inode_hash(inode);
 735
 736         if (default_acl) {
 737                 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 738                 posix_acl_release(default_acl);
 739         }
 740         if (acl) {
 741                 if (!error)
 742                         error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
 743                 posix_acl_release(acl);
 744         }
 745
 746         if (error)
 747                 goto fail_gunlock3;
 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         if (file) {
 761                 *opened |= FILE_CREATED;
 762                 error = finish_open(file, dentry, gfs2_open_common, opened);
 763         }
 764         gfs2_glock_dq_uninit(ghs);
 765         gfs2_glock_dq_uninit(ghs + 1);
 766         return error;
 767
 768 fail_gunlock3:
 769         gfs2_glock_dq_uninit(ghs + 1);
 770         if (ip->i_gl)
 771                 gfs2_glock_put(ip->i_gl);
 772         goto fail_gunlock;
 773
 774 fail_gunlock2:
 775         gfs2_glock_dq_uninit(ghs + 1);
 776 fail_free_inode:
 777         if (ip->i_gl)
 778                 gfs2_glock_put(ip->i_gl);
 779         gfs2_rs_delete(ip, NULL);
 780 fail_free_acls:
 781         if (default_acl)
 782                 posix_acl_release(default_acl);
 783         if (acl)
 784                 posix_acl_release(acl);
 785 fail_free_vfs_inode:
 786         free_vfs_inode = 1;
 787 fail_gunlock:
 788         gfs2_dir_no_add(&da);
 789         gfs2_glock_dq_uninit(ghs);
 790         if (inode && !IS_ERR(inode)) {
 791                 clear_nlink(inode);
 792                 if (!free_vfs_inode)
 793                         mark_inode_dirty(inode);
 794                 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
 795                         &GFS2_I(inode)->i_flags);
 796                 iput(inode);
 797         }
 798 fail:
 799         return error;
 800 }
 801
 802 /**
 803  * gfs2_create - Create a file
 804  * @dir: The directory in which to create the file
 805  * @dentry: The dentry of the new file
 806  * @mode: The mode of the new file
 807  *
 808  * Returns: errno
 809  */
 810
 811 static int gfs2_create(struct inode *dir, struct dentry *dentry,
 812                        umode_t mode, bool excl)
 813 {
 814         return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
 815 }
 816
 817 /**
 818  * __gfs2_lookup - Look up a filename in a directory and return its inode
 819  * @dir: The directory inode
 820  * @dentry: The dentry of the new inode
 821  * @file: File to be opened
 822  * @opened: atomic_open flags
 823  *
 824  *
 825  * Returns: errno
 826  */
 827
 828 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
 829                                     struct file *file, int *opened)
 830 {
 831         struct inode *inode;
 832         struct dentry *d;
 833         struct gfs2_holder gh;
 834         struct gfs2_glock *gl;
 835         int error;
 836
 837         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 838         if (inode == NULL) {
 839                 d_add(dentry, NULL);
 840                 return NULL;
 841         }
 842         if (IS_ERR(inode))
 843                 return ERR_CAST(inode);
 844
 845         gl = GFS2_I(inode)->i_gl;
 846         error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 847         if (error) {
 848                 iput(inode);
 849                 return ERR_PTR(error);
 850         }
 851
 852         d = d_splice_alias(inode, dentry);
 853         if (IS_ERR(d)) {
 854                 gfs2_glock_dq_uninit(&gh);
 855                 return d;
 856         }
 857         if (file && S_ISREG(inode->i_mode))
 858                 error = finish_open(file, dentry, gfs2_open_common, opened);
 859
 860         gfs2_glock_dq_uninit(&gh);
 861         if (error) {
 862                 dput(d);
 863                 return ERR_PTR(error);
 864         }
 865         return d;
 866 }
 867
 868 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 869                                   unsigned flags)
 870 {
 871         return __gfs2_lookup(dir, dentry, NULL, NULL);
 872 }
 873
 874 /**
 875  * gfs2_link - Link to a file
 876  * @old_dentry: The inode to link
 877  * @dir: Add link to this directory
 878  * @dentry: The name of the link
 879  *
 880  * Link the inode in "old_dentry" into the directory "dir" with the
 881  * name in "dentry".
 882  *
 883  * Returns: errno
 884  */
 885
 886 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 887                      struct dentry *dentry)
 888 {
 889         struct gfs2_inode *dip = GFS2_I(dir);
 890         struct gfs2_sbd *sdp = GFS2_SB(dir);
 891         struct inode *inode = d_inode(old_dentry);
 892         struct gfs2_inode *ip = GFS2_I(inode);
 893         struct gfs2_holder ghs[2];
 894         struct buffer_head *dibh;
 895         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 896         int error;
 897
 898         if (S_ISDIR(inode->i_mode))
 899                 return -EPERM;
 900
 901         error = gfs2_rs_alloc(dip);
 902         if (error)
 903                 return error;
 904
 905         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 906         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 907
 908         error = gfs2_glock_nq(ghs); /* parent */
 909         if (error)
 910                 goto out_parent;
 911
 912         error = gfs2_glock_nq(ghs + 1); /* child */
 913         if (error)
 914                 goto out_child;
 915
 916         error = -ENOENT;
 917         if (inode->i_nlink == 0)
 918                 goto out_gunlock;
 919
 920         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
 921         if (error)
 922                 goto out_gunlock;
 923
 924         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 925         switch (error) {
 926         case -ENOENT:
 927                 break;
 928         case 0:
 929                 error = -EEXIST;
 930         default:
 931                 goto out_gunlock;
 932         }
 933
 934         error = -EINVAL;
 935         if (!dip->i_inode.i_nlink)
 936                 goto out_gunlock;
 937         error = -EFBIG;
 938         if (dip->i_entries == (u32)-1)
 939                 goto out_gunlock;
 940         error = -EPERM;
 941         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 942                 goto out_gunlock;
 943         error = -EINVAL;
 944         if (!ip->i_inode.i_nlink)
 945                 goto out_gunlock;
 946         error = -EMLINK;
 947         if (ip->i_inode.i_nlink == (u32)-1)
 948                 goto out_gunlock;
 949
 950         error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
 951         if (error < 0)
 952                 goto out_gunlock;
 953
 954         if (da.nr_blocks) {
 955                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
 956                 error = gfs2_quota_lock_check(dip, &ap);
 957                 if (error)
 958                         goto out_gunlock;
 959
 960                 error = gfs2_inplace_reserve(dip, &ap);
 961                 if (error)
 962                         goto out_gunlock_q;
 963
 964                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
 965                 if (error)
 966                         goto out_ipres;
 967         } else {
 968                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 969                 if (error)
 970                         goto out_ipres;
 971         }
 972
 973         error = gfs2_meta_inode_buffer(ip, &dibh);
 974         if (error)
 975                 goto out_end_trans;
 976
 977         error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
 978         if (error)
 979                 goto out_brelse;
 980
 981         gfs2_trans_add_meta(ip->i_gl, dibh);
 982         inc_nlink(&ip->i_inode);
 983         ip->i_inode.i_ctime = CURRENT_TIME;
 984         ihold(inode);
 985         d_instantiate(dentry, inode);
 986         mark_inode_dirty(inode);
 987
 988 out_brelse:
 989         brelse(dibh);
 990 out_end_trans:
 991         gfs2_trans_end(sdp);
 992 out_ipres:
 993         if (da.nr_blocks)
 994                 gfs2_inplace_release(dip);
 995 out_gunlock_q:
 996         if (da.nr_blocks)
 997                 gfs2_quota_unlock(dip);
 998 out_gunlock:
 999         gfs2_dir_no_add(&da);
1000         gfs2_glock_dq(ghs + 1);
1001 out_child:
1002         gfs2_glock_dq(ghs);
1003 out_parent:
1004         gfs2_holder_uninit(ghs);
1005         gfs2_holder_uninit(ghs + 1);
1006         return error;
1007 }
1008
1009 /*
1010  * gfs2_unlink_ok - check to see that a inode is still in a directory
1011  * @dip: the directory
1012  * @name: the name of the file
1013  * @ip: the inode
1014  *
1015  * Assumes that the lock on (at least) @dip is held.
1016  *
1017  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1018  */
1019
1020 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1021                           const struct gfs2_inode *ip)
1022 {
1023         int error;
1024
1025         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1026                 return -EPERM;
1027
1028         if ((dip->i_inode.i_mode & S_ISVTX) &&
1029             !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1030             !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1031                 return -EPERM;
1032
1033         if (IS_APPEND(&dip->i_inode))
1034                 return -EPERM;
1035
1036         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1037         if (error)
1038                 return error;
1039
1040         return gfs2_dir_check(&dip->i_inode, name, ip);
1041 }
1042
1043 /**
1044  * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1045  * @dip: The parent directory
1046  * @name: The name of the entry in the parent directory
1047  * @inode: The inode to be removed
1048  *
1049  * Called with all the locks and in a transaction. This will only be
1050  * called for a directory after it has been checked to ensure it is empty.
1051  *
1052  * Returns: 0 on success, or an error
1053  */
1054
1055 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1056                              const struct dentry *dentry)
1057 {
1058         struct inode *inode = d_inode(dentry);
1059         struct gfs2_inode *ip = GFS2_I(inode);
1060         int error;
1061
1062         error = gfs2_dir_del(dip, dentry);
1063         if (error)
1064                 return error;
1065
1066         ip->i_entries = 0;
1067         inode->i_ctime = CURRENT_TIME;
1068         if (S_ISDIR(inode->i_mode))
1069                 clear_nlink(inode);
1070         else
1071                 drop_nlink(inode);
1072         mark_inode_dirty(inode);
1073         if (inode->i_nlink == 0)
1074                 gfs2_unlink_di(inode);
1075         return 0;
1076 }
1077
1078
1079 /**
1080  * gfs2_unlink - Unlink an inode (this does rmdir as well)
1081  * @dir: The inode of the directory containing the inode to unlink
1082  * @dentry: The file itself
1083  *
1084  * This routine uses the type of the inode as a flag to figure out
1085  * whether this is an unlink or an rmdir.
1086  *
1087  * Returns: errno
1088  */
1089
1090 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1091 {
1092         struct gfs2_inode *dip = GFS2_I(dir);
1093         struct gfs2_sbd *sdp = GFS2_SB(dir);
1094         struct inode *inode = d_inode(dentry);
1095         struct gfs2_inode *ip = GFS2_I(inode);
1096         struct gfs2_holder ghs[3];
1097         struct gfs2_rgrpd *rgd;
1098         int error;
1099
1100         error = gfs2_rindex_update(sdp);
1101         if (error)
1102                 return error;
1103
1104         error = -EROFS;
1105
1106         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1107         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1108
1109         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1110         if (!rgd)
1111                 goto out_inodes;
1112
1113         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1114
1115
1116         error = gfs2_glock_nq(ghs); /* parent */
1117         if (error)
1118                 goto out_parent;
1119
1120         error = gfs2_glock_nq(ghs + 1); /* child */
1121         if (error)
1122                 goto out_child;
1123
1124         error = -ENOENT;
1125         if (inode->i_nlink == 0)
1126                 goto out_rgrp;
1127
1128         if (S_ISDIR(inode->i_mode)) {
1129                 error = -ENOTEMPTY;
1130                 if (ip->i_entries > 2 || inode->i_nlink > 2)
1131                         goto out_rgrp;
1132         }
1133
1134         error = gfs2_glock_nq(ghs + 2); /* rgrp */
1135         if (error)
1136                 goto out_rgrp;
1137
1138         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1139         if (error)
1140                 goto out_gunlock;
1141
1142         error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1143         if (error)
1144                 goto out_end_trans;
1145
1146         error = gfs2_unlink_inode(dip, dentry);
1147
1148 out_end_trans:
1149         gfs2_trans_end(sdp);
1150 out_gunlock:
1151         gfs2_glock_dq(ghs + 2);
1152 out_rgrp:
1153         gfs2_glock_dq(ghs + 1);
1154 out_child:
1155         gfs2_glock_dq(ghs);
1156 out_parent:
1157         gfs2_holder_uninit(ghs + 2);
1158 out_inodes:
1159         gfs2_holder_uninit(ghs + 1);
1160         gfs2_holder_uninit(ghs);
1161         return error;
1162 }
1163
1164 /**
1165  * gfs2_symlink - Create a symlink
1166  * @dir: The directory to create the symlink in
1167  * @dentry: The dentry to put the symlink in
1168  * @symname: The thing which the link points to
1169  *
1170  * Returns: errno
1171  */
1172
1173 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1174                         const char *symname)
1175 {
1176         struct gfs2_sbd *sdp = GFS2_SB(dir);
1177         unsigned int size;
1178
1179         size = strlen(symname);
1180         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1181                 return -ENAMETOOLONG;
1182
1183         return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1184 }
1185
1186 /**
1187  * gfs2_mkdir - Make a directory
1188  * @dir: The parent directory of the new one
1189  * @dentry: The dentry of the new directory
1190  * @mode: The mode of the new directory
1191  *
1192  * Returns: errno
1193  */
1194
1195 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1196 {
1197         struct gfs2_sbd *sdp = GFS2_SB(dir);
1198         unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1199         return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1200 }
1201
1202 /**
1203  * gfs2_mknod - Make a special file
1204  * @dir: The directory in which the special file will reside
1205  * @dentry: The dentry of the special file
1206  * @mode: The mode of the special file
1207  * @dev: The device specification of the special file
1208  *
1209  */
1210
1211 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1212                       dev_t dev)
1213 {
1214         return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1215 }
1216
1217 /**
1218  * gfs2_atomic_open - Atomically open a file
1219  * @dir: The directory
1220  * @dentry: The proposed new entry
1221  * @file: The proposed new struct file
1222  * @flags: open flags
1223  * @mode: File mode
1224  * @opened: Flag to say whether the file has been opened or not
1225  *
1226  * Returns: error code or 0 for success
1227  */
1228
1229 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1230                             struct file *file, unsigned flags,
1231                             umode_t mode, int *opened)
1232 {
1233         struct dentry *d;
1234         bool excl = !!(flags & O_EXCL);
1235
1236         if (!d_unhashed(dentry))
1237                 goto skip_lookup;
1238
1239         d = __gfs2_lookup(dir, dentry, file, opened);
1240         if (IS_ERR(d))
1241                 return PTR_ERR(d);
1242         if (d != NULL)
1243                 dentry = d;
1244         if (d_really_is_positive(dentry)) {
1245                 if (!(*opened & FILE_OPENED))
1246                         return finish_no_open(file, d);
1247                 dput(d);
1248                 return 0;
1249         }
1250
1251         BUG_ON(d != NULL);
1252
1253 skip_lookup:
1254         if (!(flags & O_CREAT))
1255                 return -ENOENT;
1256
1257         return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1258 }
1259
1260 /*
1261  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1262  * @this: move this
1263  * @to: to here
1264  *
1265  * Follow @to back to the root and make sure we don't encounter @this
1266  * Assumes we already hold the rename lock.
1267  *
1268  * Returns: errno
1269  */
1270
1271 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1272 {
1273         struct inode *dir = &to->i_inode;
1274         struct super_block *sb = dir->i_sb;
1275         struct inode *tmp;
1276         int error = 0;
1277
1278         igrab(dir);
1279
1280         for (;;) {
1281                 if (dir == &this->i_inode) {
1282                         error = -EINVAL;
1283                         break;
1284                 }
1285                 if (dir == d_inode(sb->s_root)) {
1286                         error = 0;
1287                         break;
1288                 }
1289
1290                 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1291                 if (!tmp) {
1292                         error = -ENOENT;
1293                         break;
1294                 }
1295                 if (IS_ERR(tmp)) {
1296                         error = PTR_ERR(tmp);
1297                         break;
1298                 }
1299
1300                 iput(dir);
1301                 dir = tmp;
1302         }
1303
1304         iput(dir);
1305
1306         return error;
1307 }
1308
1309 /**
1310  * update_moved_ino - Update an inode that's being moved
1311  * @ip: The inode being moved
1312  * @ndip: The parent directory of the new filename
1313  * @dir_rename: True of ip is a directory
1314  *
1315  * Returns: errno
1316  */
1317
1318 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1319                             int dir_rename)
1320 {
1321         int error;
1322         struct buffer_head *dibh;
1323
1324         if (dir_rename)
1325                 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1326
1327         error = gfs2_meta_inode_buffer(ip, &dibh);
1328         if (error)
1329                 return error;
1330         ip->i_inode.i_ctime = CURRENT_TIME;
1331         gfs2_trans_add_meta(ip->i_gl, dibh);
1332         gfs2_dinode_out(ip, dibh->b_data);
1333         brelse(dibh);
1334         return 0;
1335 }
1336
1337
1338 /**
1339  * gfs2_rename - Rename a file
1340  * @odir: Parent directory of old file name
1341  * @odentry: The old dentry of the file
1342  * @ndir: Parent directory of new file name
1343  * @ndentry: The new dentry of the file
1344  *
1345  * Returns: errno
1346  */
1347
1348 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1349                        struct inode *ndir, struct dentry *ndentry)
1350 {
1351         struct gfs2_inode *odip = GFS2_I(odir);
1352         struct gfs2_inode *ndip = GFS2_I(ndir);
1353         struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1354         struct gfs2_inode *nip = NULL;
1355         struct gfs2_sbd *sdp = GFS2_SB(odir);
1356         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1357         struct gfs2_rgrpd *nrgd;
1358         unsigned int num_gh;
1359         int dir_rename = 0;
1360         struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1361         unsigned int x;
1362         int error;
1363
1364         if (d_really_is_positive(ndentry)) {
1365                 nip = GFS2_I(d_inode(ndentry));
1366                 if (ip == nip)
1367                         return 0;
1368         }
1369
1370         error = gfs2_rindex_update(sdp);
1371         if (error)
1372                 return error;
1373
1374         error = gfs2_rs_alloc(ndip);
1375         if (error)
1376                 return error;
1377
1378         if (odip != ndip) {
1379                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1380                                            0, &r_gh);
1381                 if (error)
1382                         goto out;
1383
1384                 if (S_ISDIR(ip->i_inode.i_mode)) {
1385                         dir_rename = 1;
1386                         /* don't move a directory into its subdir */
1387                         error = gfs2_ok_to_move(ip, ndip);
1388                         if (error)
1389                                 goto out_gunlock_r;
1390                 }
1391         }
1392
1393         num_gh = 1;
1394         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1395         if (odip != ndip) {
1396                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1397                 num_gh++;
1398         }
1399         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1400         num_gh++;
1401
1402         if (nip) {
1403                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1404                 num_gh++;
1405                 /* grab the resource lock for unlink flag twiddling
1406                  * this is the case of the target file already existing
1407                  * so we unlink before doing the rename
1408                  */
1409                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1410                 if (nrgd)
1411                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1412         }
1413
1414         for (x = 0; x < num_gh; x++) {
1415                 error = gfs2_glock_nq(ghs + x);
1416                 if (error)
1417                         goto out_gunlock;
1418         }
1419
1420         error = -ENOENT;
1421         if (ip->i_inode.i_nlink == 0)
1422                 goto out_gunlock;
1423
1424         /* Check out the old directory */
1425
1426         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1427         if (error)
1428                 goto out_gunlock;
1429
1430         /* Check out the new directory */
1431
1432         if (nip) {
1433                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1434                 if (error)
1435                         goto out_gunlock;
1436
1437                 if (nip->i_inode.i_nlink == 0) {
1438                         error = -EAGAIN;
1439                         goto out_gunlock;
1440                 }
1441
1442                 if (S_ISDIR(nip->i_inode.i_mode)) {
1443                         if (nip->i_entries < 2) {
1444                                 gfs2_consist_inode(nip);
1445                                 error = -EIO;
1446                                 goto out_gunlock;
1447                         }
1448                         if (nip->i_entries > 2) {
1449                                 error = -ENOTEMPTY;
1450                                 goto out_gunlock;
1451                         }
1452                 }
1453         } else {
1454                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1455                 if (error)
1456                         goto out_gunlock;
1457
1458                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1459                 switch (error) {
1460                 case -ENOENT:
1461                         error = 0;
1462                         break;
1463                 case 0:
1464                         error = -EEXIST;
1465                 default:
1466                         goto out_gunlock;
1467                 };
1468
1469                 if (odip != ndip) {
1470                         if (!ndip->i_inode.i_nlink) {
1471                                 error = -ENOENT;
1472                                 goto out_gunlock;
1473                         }
1474                         if (ndip->i_entries == (u32)-1) {
1475                                 error = -EFBIG;
1476                                 goto out_gunlock;
1477                         }
1478                         if (S_ISDIR(ip->i_inode.i_mode) &&
1479                             ndip->i_inode.i_nlink == (u32)-1) {
1480                                 error = -EMLINK;
1481                                 goto out_gunlock;
1482                         }
1483                 }
1484         }
1485
1486         /* Check out the dir to be renamed */
1487
1488         if (dir_rename) {
1489                 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1490                 if (error)
1491                         goto out_gunlock;
1492         }
1493
1494         if (nip == NULL) {
1495                 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1496                 if (error)
1497                         goto out_gunlock;
1498         }
1499
1500         if (da.nr_blocks) {
1501                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1502                 error = gfs2_quota_lock_check(ndip, &ap);
1503                 if (error)
1504                         goto out_gunlock;
1505
1506                 error = gfs2_inplace_reserve(ndip, &ap);
1507                 if (error)
1508                         goto out_gunlock_q;
1509
1510                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1511                                          4 * RES_LEAF + 4, 0);
1512                 if (error)
1513                         goto out_ipreserv;
1514         } else {
1515                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1516                                          5 * RES_LEAF + 4, 0);
1517                 if (error)
1518                         goto out_gunlock;
1519         }
1520
1521         /* Remove the target file, if it exists */
1522
1523         if (nip)
1524                 error = gfs2_unlink_inode(ndip, ndentry);
1525
1526         error = update_moved_ino(ip, ndip, dir_rename);
1527         if (error)
1528                 goto out_end_trans;
1529
1530         error = gfs2_dir_del(odip, odentry);
1531         if (error)
1532                 goto out_end_trans;
1533
1534         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1535         if (error)
1536                 goto out_end_trans;
1537
1538 out_end_trans:
1539         gfs2_trans_end(sdp);
1540 out_ipreserv:
1541         if (da.nr_blocks)
1542                 gfs2_inplace_release(ndip);
1543 out_gunlock_q:
1544         if (da.nr_blocks)
1545                 gfs2_quota_unlock(ndip);
1546 out_gunlock:
1547         gfs2_dir_no_add(&da);
1548         while (x--) {
1549                 gfs2_glock_dq(ghs + x);
1550                 gfs2_holder_uninit(ghs + x);
1551         }
1552 out_gunlock_r:
1553         if (r_gh.gh_gl)
1554                 gfs2_glock_dq_uninit(&r_gh);
1555 out:
1556         return error;
1557 }
1558
1559 /**
1560  * gfs2_exchange - exchange two files
1561  * @odir: Parent directory of old file name
1562  * @odentry: The old dentry of the file
1563  * @ndir: Parent directory of new file name
1564  * @ndentry: The new dentry of the file
1565  * @flags: The rename flags
1566  *
1567  * Returns: errno
1568  */
1569
1570 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1571                          struct inode *ndir, struct dentry *ndentry,
1572                          unsigned int flags)
1573 {
1574         struct gfs2_inode *odip = GFS2_I(odir);
1575         struct gfs2_inode *ndip = GFS2_I(ndir);
1576         struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1577         struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1578         struct gfs2_sbd *sdp = GFS2_SB(odir);
1579         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1580         unsigned int num_gh;
1581         unsigned int x;
1582         umode_t old_mode = oip->i_inode.i_mode;
1583         umode_t new_mode = nip->i_inode.i_mode;
1584         int error;
1585
1586         error = gfs2_rindex_update(sdp);
1587         if (error)
1588                 return error;
1589
1590         if (odip != ndip) {
1591                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1592                                            0, &r_gh);
1593                 if (error)
1594                         goto out;
1595
1596                 if (S_ISDIR(old_mode)) {
1597                         /* don't move a directory into its subdir */
1598                         error = gfs2_ok_to_move(oip, ndip);
1599                         if (error)
1600                                 goto out_gunlock_r;
1601                 }
1602
1603                 if (S_ISDIR(new_mode)) {
1604                         /* don't move a directory into its subdir */
1605                         error = gfs2_ok_to_move(nip, odip);
1606                         if (error)
1607                                 goto out_gunlock_r;
1608                 }
1609         }
1610
1611         num_gh = 1;
1612         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1613         if (odip != ndip) {
1614                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1615                 num_gh++;
1616         }
1617         gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1618         num_gh++;
1619
1620         gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1621         num_gh++;
1622
1623         for (x = 0; x < num_gh; x++) {
1624                 error = gfs2_glock_nq(ghs + x);
1625                 if (error)
1626                         goto out_gunlock;
1627         }
1628
1629         error = -ENOENT;
1630         if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1631                 goto out_gunlock;
1632
1633         error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1634         if (error)
1635                 goto out_gunlock;
1636         error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1637         if (error)
1638                 goto out_gunlock;
1639
1640         if (S_ISDIR(old_mode)) {
1641                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1642                 if (error)
1643                         goto out_gunlock;
1644         }
1645         if (S_ISDIR(new_mode)) {
1646                 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1647                 if (error)
1648                         goto out_gunlock;
1649         }
1650         error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1651         if (error)
1652                 goto out_gunlock;
1653
1654         error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1655         if (error)
1656                 goto out_end_trans;
1657
1658         error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1659         if (error)
1660                 goto out_end_trans;
1661
1662         error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1663                                IF2DT(old_mode));
1664         if (error)
1665                 goto out_end_trans;
1666
1667         error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1668                                IF2DT(new_mode));
1669         if (error)
1670                 goto out_end_trans;
1671
1672         if (odip != ndip) {
1673                 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1674                         inc_nlink(&odip->i_inode);
1675                         drop_nlink(&ndip->i_inode);
1676                 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1677                         inc_nlink(&ndip->i_inode);
1678                         drop_nlink(&odip->i_inode);
1679                 }
1680         }
1681         mark_inode_dirty(&ndip->i_inode);
1682         if (odip != ndip)
1683                 mark_inode_dirty(&odip->i_inode);
1684
1685 out_end_trans:
1686         gfs2_trans_end(sdp);
1687 out_gunlock:
1688         while (x--) {
1689                 gfs2_glock_dq(ghs + x);
1690                 gfs2_holder_uninit(ghs + x);
1691         }
1692 out_gunlock_r:
1693         if (r_gh.gh_gl)
1694                 gfs2_glock_dq_uninit(&r_gh);
1695 out:
1696         return error;
1697 }
1698
1699 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1700                         struct inode *ndir, struct dentry *ndentry,
1701                         unsigned int flags)
1702 {
1703         flags &= ~RENAME_NOREPLACE;
1704
1705         if (flags & ~RENAME_EXCHANGE)
1706                 return -EINVAL;
1707
1708         if (flags & RENAME_EXCHANGE)
1709                 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1710
1711         return gfs2_rename(odir, odentry, ndir, ndentry);
1712 }
1713
1714 /**
1715  * gfs2_follow_link - Follow a symbolic link
1716  * @dentry: The dentry of the link
1717  * @nd: Data that we pass to vfs_follow_link()
1718  *
1719  * This can handle symlinks of any size.
1720  *
1721  * Returns: 0 on success or error code
1722  */
1723
1724 static const char *gfs2_follow_link(struct dentry *dentry, void **cookie)
1725 {
1726         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
1727         struct gfs2_holder i_gh;
1728         struct buffer_head *dibh;
1729         unsigned int size;
1730         char *buf;
1731         int error;
1732
1733         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1734         error = gfs2_glock_nq(&i_gh);
1735         if (error) {
1736                 gfs2_holder_uninit(&i_gh);
1737                 return ERR_PTR(error);
1738         }
1739
1740         size = (unsigned int)i_size_read(&ip->i_inode);
1741         if (size == 0) {
1742                 gfs2_consist_inode(ip);
1743                 buf = ERR_PTR(-EIO);
1744                 goto out;
1745         }
1746
1747         error = gfs2_meta_inode_buffer(ip, &dibh);
1748         if (error) {
1749                 buf = ERR_PTR(error);
1750                 goto out;
1751         }
1752
1753         buf = kzalloc(size + 1, GFP_NOFS);
1754         if (!buf)
1755                 buf = ERR_PTR(-ENOMEM);
1756         else
1757                 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1758         brelse(dibh);
1759 out:
1760         gfs2_glock_dq_uninit(&i_gh);
1761         if (!IS_ERR(buf))
1762                 *cookie = buf;
1763         return buf;
1764 }
1765
1766 /**
1767  * gfs2_permission -
1768  * @inode: The inode
1769  * @mask: The mask to be tested
1770  * @flags: Indicates whether this is an RCU path walk or not
1771  *
1772  * This may be called from the VFS directly, or from within GFS2 with the
1773  * inode locked, so we look to see if the glock is already locked and only
1774  * lock the glock if its not already been done.
1775  *
1776  * Returns: errno
1777  */
1778
1779 int gfs2_permission(struct inode *inode, int mask)
1780 {
1781         struct gfs2_inode *ip;
1782         struct gfs2_holder i_gh;
1783         int error;
1784         int unlock = 0;
1785
1786
1787         ip = GFS2_I(inode);
1788         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1789                 if (mask & MAY_NOT_BLOCK)
1790                         return -ECHILD;
1791                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1792                 if (error)
1793                         return error;
1794                 unlock = 1;
1795         }
1796
1797         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1798                 error = -EACCES;
1799         else
1800                 error = generic_permission(inode, mask);
1801         if (unlock)
1802                 gfs2_glock_dq_uninit(&i_gh);
1803
1804         return error;
1805 }
1806
1807 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1808 {
1809         setattr_copy(inode, attr);
1810         mark_inode_dirty(inode);
1811         return 0;
1812 }
1813
1814 /**
1815  * gfs2_setattr_simple -
1816  * @ip:
1817  * @attr:
1818  *
1819  * Returns: errno
1820  */
1821
1822 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1823 {
1824         int error;
1825
1826         if (current->journal_info)
1827                 return __gfs2_setattr_simple(inode, attr);
1828
1829         error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1830         if (error)
1831                 return error;
1832
1833         error = __gfs2_setattr_simple(inode, attr);
1834         gfs2_trans_end(GFS2_SB(inode));
1835         return error;
1836 }
1837
1838 static int setattr_chown(struct inode *inode, struct iattr *attr)
1839 {
1840         struct gfs2_inode *ip = GFS2_I(inode);
1841         struct gfs2_sbd *sdp = GFS2_SB(inode);
1842         kuid_t ouid, nuid;
1843         kgid_t ogid, ngid;
1844         int error;
1845         struct gfs2_alloc_parms ap;
1846
1847         ouid = inode->i_uid;
1848         ogid = inode->i_gid;
1849         nuid = attr->ia_uid;
1850         ngid = attr->ia_gid;
1851
1852         if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1853                 ouid = nuid = NO_UID_QUOTA_CHANGE;
1854         if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1855                 ogid = ngid = NO_GID_QUOTA_CHANGE;
1856
1857         error = get_write_access(inode);
1858         if (error)
1859                 return error;
1860
1861         error = gfs2_rs_alloc(ip);
1862         if (error)
1863                 goto out;
1864
1865         error = gfs2_rindex_update(sdp);
1866         if (error)
1867                 goto out;
1868
1869         error = gfs2_quota_lock(ip, nuid, ngid);
1870         if (error)
1871                 goto out;
1872
1873         ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1874
1875         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1876             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1877                 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1878                 if (error)
1879                         goto out_gunlock_q;
1880         }
1881
1882         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1883         if (error)
1884                 goto out_gunlock_q;
1885
1886         error = gfs2_setattr_simple(inode, attr);
1887         if (error)
1888                 goto out_end_trans;
1889
1890         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1891             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1892                 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1893                 gfs2_quota_change(ip, ap.target, nuid, ngid);
1894         }
1895
1896 out_end_trans:
1897         gfs2_trans_end(sdp);
1898 out_gunlock_q:
1899         gfs2_quota_unlock(ip);
1900 out:
1901         put_write_access(inode);
1902         return error;
1903 }
1904
1905 /**
1906  * gfs2_setattr - Change attributes on an inode
1907  * @dentry: The dentry which is changing
1908  * @attr: The structure describing the change
1909  *
1910  * The VFS layer wants to change one or more of an inodes attributes.  Write
1911  * that change out to disk.
1912  *
1913  * Returns: errno
1914  */
1915
1916 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1917 {
1918         struct inode *inode = d_inode(dentry);
1919         struct gfs2_inode *ip = GFS2_I(inode);
1920         struct gfs2_holder i_gh;
1921         int error;
1922
1923         error = gfs2_rs_alloc(ip);
1924         if (error)
1925                 return error;
1926
1927         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1928         if (error)
1929                 return error;
1930
1931         error = -EPERM;
1932         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1933                 goto out;
1934
1935         error = inode_change_ok(inode, attr);
1936         if (error)
1937                 goto out;
1938
1939         if (attr->ia_valid & ATTR_SIZE)
1940                 error = gfs2_setattr_size(inode, attr->ia_size);
1941         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1942                 error = setattr_chown(inode, attr);
1943         else {
1944                 error = gfs2_setattr_simple(inode, attr);
1945                 if (!error && attr->ia_valid & ATTR_MODE)
1946                         error = posix_acl_chmod(inode, inode->i_mode);
1947         }
1948
1949 out:
1950         if (!error)
1951                 mark_inode_dirty(inode);
1952         gfs2_glock_dq_uninit(&i_gh);
1953         return error;
1954 }
1955
1956 /**
1957  * gfs2_getattr - Read out an inode's attributes
1958  * @mnt: The vfsmount the inode is being accessed from
1959  * @dentry: The dentry to stat
1960  * @stat: The inode's stats
1961  *
1962  * This may be called from the VFS directly, or from within GFS2 with the
1963  * inode locked, so we look to see if the glock is already locked and only
1964  * lock the glock if its not already been done. Note that its the NFS
1965  * readdirplus operation which causes this to be called (from filldir)
1966  * with the glock already held.
1967  *
1968  * Returns: errno
1969  */
1970
1971 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1972                         struct kstat *stat)
1973 {
1974         struct inode *inode = d_inode(dentry);
1975         struct gfs2_inode *ip = GFS2_I(inode);
1976         struct gfs2_holder gh;
1977         int error;
1978         int unlock = 0;
1979
1980         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1981                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1982                 if (error)
1983                         return error;
1984                 unlock = 1;
1985         }
1986
1987         generic_fillattr(inode, stat);
1988         if (unlock)
1989                 gfs2_glock_dq_uninit(&gh);
1990
1991         return 0;
1992 }
1993
1994 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1995                          const void *data, size_t size, int flags)
1996 {
1997         struct inode *inode = d_inode(dentry);
1998         struct gfs2_inode *ip = GFS2_I(inode);
1999         struct gfs2_holder gh;
2000         int ret;
2001
2002         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2003         ret = gfs2_glock_nq(&gh);
2004         if (ret == 0) {
2005                 ret = gfs2_rs_alloc(ip);
2006                 if (ret == 0)
2007                         ret = generic_setxattr(dentry, name, data, size, flags);
2008                 gfs2_glock_dq(&gh);
2009         }
2010         gfs2_holder_uninit(&gh);
2011         return ret;
2012 }
2013
2014 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
2015                              void *data, size_t size)
2016 {
2017         struct inode *inode = d_inode(dentry);
2018         struct gfs2_inode *ip = GFS2_I(inode);
2019         struct gfs2_holder gh;
2020         int ret;
2021
2022         /* For selinux during lookup */
2023         if (gfs2_glock_is_locked_by_me(ip->i_gl))
2024                 return generic_getxattr(dentry, name, data, size);
2025
2026         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2027         ret = gfs2_glock_nq(&gh);
2028         if (ret == 0) {
2029                 ret = generic_getxattr(dentry, name, data, size);
2030                 gfs2_glock_dq(&gh);
2031         }
2032         gfs2_holder_uninit(&gh);
2033         return ret;
2034 }
2035
2036 static int gfs2_removexattr(struct dentry *dentry, const char *name)
2037 {
2038         struct inode *inode = d_inode(dentry);
2039         struct gfs2_inode *ip = GFS2_I(inode);
2040         struct gfs2_holder gh;
2041         int ret;
2042
2043         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2044         ret = gfs2_glock_nq(&gh);
2045         if (ret == 0) {
2046                 ret = gfs2_rs_alloc(ip);
2047                 if (ret == 0)
2048                         ret = generic_removexattr(dentry, name);
2049                 gfs2_glock_dq(&gh);
2050         }
2051         gfs2_holder_uninit(&gh);
2052         return ret;
2053 }
2054
2055 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2056                        u64 start, u64 len)
2057 {
2058         struct gfs2_inode *ip = GFS2_I(inode);
2059         struct gfs2_holder gh;
2060         int ret;
2061
2062         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2063         if (ret)
2064                 return ret;
2065
2066         mutex_lock(&inode->i_mutex);
2067
2068         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2069         if (ret)
2070                 goto out;
2071
2072         if (gfs2_is_stuffed(ip)) {
2073                 u64 phys = ip->i_no_addr << inode->i_blkbits;
2074                 u64 size = i_size_read(inode);
2075                 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2076                             FIEMAP_EXTENT_DATA_INLINE;
2077                 phys += sizeof(struct gfs2_dinode);
2078                 phys += start;
2079                 if (start + len > size)
2080                         len = size - start;
2081                 if (start < size)
2082                         ret = fiemap_fill_next_extent(fieinfo, start, phys,
2083                                                       len, flags);
2084                 if (ret == 1)
2085                         ret = 0;
2086         } else {
2087                 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2088                                              gfs2_block_map);
2089         }
2090
2091         gfs2_glock_dq_uninit(&gh);
2092 out:
2093         mutex_unlock(&inode->i_mutex);
2094         return ret;
2095 }
2096
2097 const struct inode_operations gfs2_file_iops = {
2098         .permission = gfs2_permission,
2099         .setattr = gfs2_setattr,
2100         .getattr = gfs2_getattr,
2101         .setxattr = gfs2_setxattr,
2102         .getxattr = gfs2_getxattr,
2103         .listxattr = gfs2_listxattr,
2104         .removexattr = gfs2_removexattr,
2105         .fiemap = gfs2_fiemap,
2106         .get_acl = gfs2_get_acl,
2107         .set_acl = gfs2_set_acl,
2108 };
2109
2110 const struct inode_operations gfs2_dir_iops = {
2111         .create = gfs2_create,
2112         .lookup = gfs2_lookup,
2113         .link = gfs2_link,
2114         .unlink = gfs2_unlink,
2115         .symlink = gfs2_symlink,
2116         .mkdir = gfs2_mkdir,
2117         .rmdir = gfs2_unlink,
2118         .mknod = gfs2_mknod,
2119         .rename2 = gfs2_rename2,
2120         .permission = gfs2_permission,
2121         .setattr = gfs2_setattr,
2122         .getattr = gfs2_getattr,
2123         .setxattr = gfs2_setxattr,
2124         .getxattr = gfs2_getxattr,
2125         .listxattr = gfs2_listxattr,
2126         .removexattr = gfs2_removexattr,
2127         .fiemap = gfs2_fiemap,
2128         .get_acl = gfs2_get_acl,
2129         .set_acl = gfs2_set_acl,
2130         .atomic_open = gfs2_atomic_open,
2131 };
2132
2133 const struct inode_operations gfs2_symlink_iops = {
2134         .readlink = generic_readlink,
2135         .follow_link = gfs2_follow_link,
2136         .put_link = kfree_put_link,
2137         .permission = gfs2_permission,
2138         .setattr = gfs2_setattr,
2139         .getattr = gfs2_getattr,
2140         .setxattr = gfs2_setxattr,
2141         .getxattr = gfs2_getxattr,
2142         .listxattr = gfs2_listxattr,
2143         .removexattr = gfs2_removexattr,
2144         .fiemap = gfs2_fiemap,
2145 };
2146