fs/gfs2/ops_file.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/pagemap.h>
  15 #include <linux/uio.h>
  16 #include <linux/blkdev.h>
  17 #include <linux/mm.h>
  18 #include <linux/fs.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/ext2_fs.h>
  21 #include <linux/crc32.h>
  22 #include <linux/lm_interface.h>
  23 #include <linux/writeback.h>
  24 #include <asm/uaccess.h>
  25
  26 #include "gfs2.h"
  27 #include "incore.h"
  28 #include "bmap.h"
  29 #include "dir.h"
  30 #include "glock.h"
  31 #include "glops.h"
  32 #include "inode.h"
  33 #include "lm.h"
  34 #include "log.h"
  35 #include "meta_io.h"
  36 #include "ops_file.h"
  37 #include "ops_vm.h"
  38 #include "quota.h"
  39 #include "rgrp.h"
  40 #include "trans.h"
  41 #include "util.h"
  42 #include "eaops.h"
  43
  44 /*
  45  * Most fields left uninitialised to catch anybody who tries to
  46  * use them. f_flags set to prevent file_accessed() from touching
  47  * any other part of this. Its use is purely as a flag so that we
  48  * know (in readpage()) whether or not do to locking.
  49  */
  50 struct file gfs2_internal_file_sentinel = {
  51         .f_flags = O_NOATIME|O_RDONLY,
  52 };
  53
  54 static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
  55                            unsigned long offset, unsigned long size)
  56 {
  57         char *kaddr;
  58         unsigned long count = desc->count;
  59
  60         if (size > count)
  61                 size = count;
  62
  63         kaddr = kmap(page);
  64         memcpy(desc->arg.data, kaddr + offset, size);
  65         kunmap(page);
  66
  67         desc->count = count - size;
  68         desc->written += size;
  69         desc->arg.buf += size;
  70         return size;
  71 }
  72
  73 int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
  74                        char *buf, loff_t *pos, unsigned size)
  75 {
  76         struct inode *inode = &ip->i_inode;
  77         read_descriptor_t desc;
  78         desc.written = 0;
  79         desc.arg.data = buf;
  80         desc.count = size;
  81         desc.error = 0;
  82         do_generic_mapping_read(inode->i_mapping, ra_state,
  83                                 &gfs2_internal_file_sentinel, pos, &desc,
  84                                 gfs2_read_actor);
  85         return desc.written ? desc.written : desc.error;
  86 }
  87
  88 /**
  89  * gfs2_llseek - seek to a location in a file
  90  * @file: the file
  91  * @offset: the offset
  92  * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
  93  *
  94  * SEEK_END requires the glock for the file because it references the
  95  * file's size.
  96  *
  97  * Returns: The new offset, or errno
  98  */
  99
 100 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
 101 {
 102         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 103         struct gfs2_holder i_gh;
 104         loff_t error;
 105
 106         if (origin == 2) {
 107                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
 108                                            &i_gh);
 109                 if (!error) {
 110                         error = remote_llseek(file, offset, origin);
 111                         gfs2_glock_dq_uninit(&i_gh);
 112                 }
 113         } else
 114                 error = remote_llseek(file, offset, origin);
 115
 116         return error;
 117 }
 118
 119 /**
 120  * gfs2_readdir - Read directory entries from a directory
 121  * @file: The directory to read from
 122  * @dirent: Buffer for dirents
 123  * @filldir: Function used to do the copying
 124  *
 125  * Returns: errno
 126  */
 127
 128 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
 129 {
 130         struct inode *dir = file->f_mapping->host;
 131         struct gfs2_inode *dip = GFS2_I(dir);
 132         struct gfs2_holder d_gh;
 133         u64 offset = file->f_pos;
 134         int error;
 135
 136         gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
 137         error = gfs2_glock_nq_atime(&d_gh);
 138         if (error) {
 139                 gfs2_holder_uninit(&d_gh);
 140                 return error;
 141         }
 142
 143         error = gfs2_dir_read(dir, &offset, dirent, filldir);
 144
 145         gfs2_glock_dq_uninit(&d_gh);
 146
 147         file->f_pos = offset;
 148
 149         return error;
 150 }
 151
 152 /**
 153  * fsflags_cvt
 154  * @table: A table of 32 u32 flags
 155  * @val: a 32 bit value to convert
 156  *
 157  * This function can be used to convert between fsflags values and
 158  * GFS2's own flags values.
 159  *
 160  * Returns: the converted flags
 161  */
 162 static u32 fsflags_cvt(const u32 *table, u32 val)
 163 {
 164         u32 res = 0;
 165         while(val) {
 166                 if (val & 1)
 167                         res |= *table;
 168                 table++;
 169                 val >>= 1;
 170         }
 171         return res;
 172 }
 173
 174 static const u32 fsflags_to_gfs2[32] = {
 175         [3] = GFS2_DIF_SYNC,
 176         [4] = GFS2_DIF_IMMUTABLE,
 177         [5] = GFS2_DIF_APPENDONLY,
 178         [7] = GFS2_DIF_NOATIME,
 179         [12] = GFS2_DIF_EXHASH,
 180         [14] = GFS2_DIF_JDATA,
 181         [20] = GFS2_DIF_DIRECTIO,
 182 };
 183
 184 static const u32 gfs2_to_fsflags[32] = {
 185         [gfs2fl_Sync] = FS_SYNC_FL,
 186         [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
 187         [gfs2fl_AppendOnly] = FS_APPEND_FL,
 188         [gfs2fl_NoAtime] = FS_NOATIME_FL,
 189         [gfs2fl_ExHash] = FS_INDEX_FL,
 190         [gfs2fl_Jdata] = FS_JOURNAL_DATA_FL,
 191         [gfs2fl_Directio] = FS_DIRECTIO_FL,
 192         [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL,
 193         [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
 194 };
 195
 196 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
 197 {
 198         struct inode *inode = filp->f_path.dentry->d_inode;
 199         struct gfs2_inode *ip = GFS2_I(inode);
 200         struct gfs2_holder gh;
 201         int error;
 202         u32 fsflags;
 203
 204         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
 205         error = gfs2_glock_nq_atime(&gh);
 206         if (error)
 207                 return error;
 208
 209         fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
 210         if (put_user(fsflags, ptr))
 211                 error = -EFAULT;
 212
 213         gfs2_glock_dq_m(1, &gh);
 214         gfs2_holder_uninit(&gh);
 215         return error;
 216 }
 217
 218 void gfs2_set_inode_flags(struct inode *inode)
 219 {
 220         struct gfs2_inode *ip = GFS2_I(inode);
 221         struct gfs2_dinode_host *di = &ip->i_di;
 222         unsigned int flags = inode->i_flags;
 223
 224         flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
 225         if (di->di_flags & GFS2_DIF_IMMUTABLE)
 226                 flags |= S_IMMUTABLE;
 227         if (di->di_flags & GFS2_DIF_APPENDONLY)
 228                 flags |= S_APPEND;
 229         if (di->di_flags & GFS2_DIF_NOATIME)
 230                 flags |= S_NOATIME;
 231         if (di->di_flags & GFS2_DIF_SYNC)
 232                 flags |= S_SYNC;
 233         inode->i_flags = flags;
 234 }
 235
 236 /* Flags that can be set by user space */
 237 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA|                    \
 238                              GFS2_DIF_DIRECTIO|                 \
 239                              GFS2_DIF_IMMUTABLE|                \
 240                              GFS2_DIF_APPENDONLY|               \
 241                              GFS2_DIF_NOATIME|                  \
 242                              GFS2_DIF_SYNC|                     \
 243                              GFS2_DIF_SYSTEM|                   \
 244                              GFS2_DIF_INHERIT_DIRECTIO|         \
 245                              GFS2_DIF_INHERIT_JDATA)
 246
 247 /**
 248  * gfs2_set_flags - set flags on an inode
 249  * @inode: The inode
 250  * @flags: The flags to set
 251  * @mask: Indicates which flags are valid
 252  *
 253  */
 254 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
 255 {
 256         struct inode *inode = filp->f_path.dentry->d_inode;
 257         struct gfs2_inode *ip = GFS2_I(inode);
 258         struct gfs2_sbd *sdp = GFS2_SB(inode);
 259         struct buffer_head *bh;
 260         struct gfs2_holder gh;
 261         int error;
 262         u32 new_flags, flags;
 263
 264         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 265         if (error)
 266                 return error;
 267
 268         flags = ip->i_di.di_flags;
 269         new_flags = (flags & ~mask) | (reqflags & mask);
 270         if ((new_flags ^ flags) == 0)
 271                 goto out;
 272
 273         if (S_ISDIR(inode->i_mode)) {
 274                 if ((new_flags ^ flags) & GFS2_DIF_JDATA)
 275                         new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA);
 276                 if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO)
 277                         new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO);
 278         }
 279
 280         error = -EINVAL;
 281         if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
 282                 goto out;
 283
 284         error = -EPERM;
 285         if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
 286                 goto out;
 287         if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
 288                 goto out;
 289         if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
 290             !capable(CAP_LINUX_IMMUTABLE))
 291                 goto out;
 292         if (!IS_IMMUTABLE(inode)) {
 293                 error = permission(inode, MAY_WRITE, NULL);
 294                 if (error)
 295                         goto out;
 296         }
 297
 298         error = gfs2_trans_begin(sdp, RES_DINODE, 0);
 299         if (error)
 300                 goto out;
 301         error = gfs2_meta_inode_buffer(ip, &bh);
 302         if (error)
 303                 goto out_trans_end;
 304         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 305         ip->i_di.di_flags = new_flags;
 306         gfs2_dinode_out(ip, bh->b_data);
 307         brelse(bh);
 308         gfs2_set_inode_flags(inode);
 309 out_trans_end:
 310         gfs2_trans_end(sdp);
 311 out:
 312         gfs2_glock_dq_uninit(&gh);
 313         return error;
 314 }
 315
 316 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
 317 {
 318         u32 fsflags, gfsflags;
 319         if (get_user(fsflags, ptr))
 320                 return -EFAULT;
 321         gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
 322         return do_gfs2_set_flags(filp, gfsflags, ~0);
 323 }
 324
 325 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 326 {
 327         switch(cmd) {
 328         case FS_IOC_GETFLAGS:
 329                 return gfs2_get_flags(filp, (u32 __user *)arg);
 330         case FS_IOC_SETFLAGS:
 331                 return gfs2_set_flags(filp, (u32 __user *)arg);
 332         }
 333         return -ENOTTY;
 334 }
 335
 336
 337 /**
 338  * gfs2_mmap -
 339  * @file: The file to map
 340  * @vma: The VMA which described the mapping
 341  *
 342  * Returns: 0 or error code
 343  */
 344
 345 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
 346 {
 347         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 348         struct gfs2_holder i_gh;
 349         int error;
 350
 351         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
 352         error = gfs2_glock_nq_atime(&i_gh);
 353         if (error) {
 354                 gfs2_holder_uninit(&i_gh);
 355                 return error;
 356         }
 357
 358         /* This is VM_MAYWRITE instead of VM_WRITE because a call
 359            to mprotect() can turn on VM_WRITE later. */
 360
 361         if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
 362             (VM_MAYSHARE | VM_MAYWRITE))
 363                 vma->vm_ops = &gfs2_vm_ops_sharewrite;
 364         else
 365                 vma->vm_ops = &gfs2_vm_ops_private;
 366
 367         gfs2_glock_dq_uninit(&i_gh);
 368
 369         return error;
 370 }
 371
 372 /**
 373  * gfs2_open - open a file
 374  * @inode: the inode to open
 375  * @file: the struct file for this opening
 376  *
 377  * Returns: errno
 378  */
 379
 380 static int gfs2_open(struct inode *inode, struct file *file)
 381 {
 382         struct gfs2_inode *ip = GFS2_I(inode);
 383         struct gfs2_holder i_gh;
 384         struct gfs2_file *fp;
 385         int error;
 386
 387         fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
 388         if (!fp)
 389                 return -ENOMEM;
 390
 391         mutex_init(&fp->f_fl_mutex);
 392
 393         gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
 394         file->private_data = fp;
 395
 396         if (S_ISREG(ip->i_inode.i_mode)) {
 397                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
 398                                            &i_gh);
 399                 if (error)
 400                         goto fail;
 401
 402                 if (!(file->f_flags & O_LARGEFILE) &&
 403                     ip->i_di.di_size > MAX_NON_LFS) {
 404                         error = -EFBIG;
 405                         goto fail_gunlock;
 406                 }
 407
 408                 /* Listen to the Direct I/O flag */
 409
 410                 if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
 411                         file->f_flags |= O_DIRECT;
 412
 413                 gfs2_glock_dq_uninit(&i_gh);
 414         }
 415
 416         return 0;
 417
 418 fail_gunlock:
 419         gfs2_glock_dq_uninit(&i_gh);
 420 fail:
 421         file->private_data = NULL;
 422         kfree(fp);
 423         return error;
 424 }
 425
 426 /**
 427  * gfs2_close - called to close a struct file
 428  * @inode: the inode the struct file belongs to
 429  * @file: the struct file being closed
 430  *
 431  * Returns: errno
 432  */
 433
 434 static int gfs2_close(struct inode *inode, struct file *file)
 435 {
 436         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
 437         struct gfs2_file *fp;
 438
 439         fp = file->private_data;
 440         file->private_data = NULL;
 441
 442         if (gfs2_assert_warn(sdp, fp))
 443                 return -EIO;
 444
 445         kfree(fp);
 446
 447         return 0;
 448 }
 449
 450 /**
 451  * gfs2_fsync - sync the dirty data for a file (across the cluster)
 452  * @file: the file that points to the dentry (we ignore this)
 453  * @dentry: the dentry that points to the inode to sync
 454  *
 455  * The VFS will flush "normal" data for us. We only need to worry
 456  * about metadata here. For journaled data, we just do a log flush
 457  * as we can't avoid it. Otherwise we can just bale out if datasync
 458  * is set. For stuffed inodes we must flush the log in order to
 459  * ensure that all data is on disk.
 460  *
 461  * The call to write_inode_now() is there to write back metadata and
 462  * the inode itself. It does also try and write the data, but thats
 463  * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
 464  * for us.
 465  *
 466  * Returns: errno
 467  */
 468
 469 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
 470 {
 471         struct inode *inode = dentry->d_inode;
 472         int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
 473         int ret = 0;
 474
 475         if (gfs2_is_jdata(GFS2_I(inode))) {
 476                 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
 477                 return 0;
 478         }
 479
 480         if (sync_state != 0) {
 481                 if (!datasync)
 482                         ret = write_inode_now(inode, 0);
 483
 484                 if (gfs2_is_stuffed(GFS2_I(inode)))
 485                         gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
 486         }
 487
 488         return ret;
 489 }
 490
 491 /**
 492  * gfs2_lock - acquire/release a posix lock on a file
 493  * @file: the file pointer
 494  * @cmd: either modify or retrieve lock state, possibly wait
 495  * @fl: type and range of lock
 496  *
 497  * Returns: errno
 498  */
 499
 500 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
 501 {
 502         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 503         struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
 504         struct lm_lockname name =
 505                 { .ln_number = ip->i_no_addr,
 506                   .ln_type = LM_TYPE_PLOCK };
 507
 508         if (!(fl->fl_flags & FL_POSIX))
 509                 return -ENOLCK;
 510         if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 511                 return -ENOLCK;
 512
 513         if (sdp->sd_args.ar_localflocks) {
 514                 if (IS_GETLK(cmd)) {
 515                         posix_test_lock(file, fl);
 516                         return 0;
 517                 } else {
 518                         return posix_lock_file_wait(file, fl);
 519                 }
 520         }
 521
 522         if (cmd == F_CANCELLK) {
 523                 /* Hack: */
 524                 cmd = F_SETLK;
 525                 fl->fl_type = F_UNLCK;
 526         }
 527         if (IS_GETLK(cmd))
 528                 return gfs2_lm_plock_get(sdp, &name, file, fl);
 529         else if (fl->fl_type == F_UNLCK)
 530                 return gfs2_lm_punlock(sdp, &name, file, fl);
 531         else
 532                 return gfs2_lm_plock(sdp, &name, file, cmd, fl);
 533 }
 534
 535 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
 536 {
 537         struct gfs2_file *fp = file->private_data;
 538         struct gfs2_holder *fl_gh = &fp->f_fl_gh;
 539         struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
 540         struct gfs2_glock *gl;
 541         unsigned int state;
 542         int flags;
 543         int error = 0;
 544
 545         state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
 546         flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
 547
 548         mutex_lock(&fp->f_fl_mutex);
 549
 550         gl = fl_gh->gh_gl;
 551         if (gl) {
 552                 if (fl_gh->gh_state == state)
 553                         goto out;
 554                 gfs2_glock_hold(gl);
 555                 flock_lock_file_wait(file,
 556                                      &(struct file_lock){.fl_type = F_UNLCK});
 557                 gfs2_glock_dq_uninit(fl_gh);
 558         } else {
 559                 error = gfs2_glock_get(GFS2_SB(&ip->i_inode),
 560                                       ip->i_no_addr, &gfs2_flock_glops,
 561                                       CREATE, &gl);
 562                 if (error)
 563                         goto out;
 564         }
 565
 566         gfs2_holder_init(gl, state, flags, fl_gh);
 567         gfs2_glock_put(gl);
 568
 569         error = gfs2_glock_nq(fl_gh);
 570         if (error) {
 571                 gfs2_holder_uninit(fl_gh);
 572                 if (error == GLR_TRYFAILED)
 573                         error = -EAGAIN;
 574         } else {
 575                 error = flock_lock_file_wait(file, fl);
 576                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
 577         }
 578
 579 out:
 580         mutex_unlock(&fp->f_fl_mutex);
 581         return error;
 582 }
 583
 584 static void do_unflock(struct file *file, struct file_lock *fl)
 585 {
 586         struct gfs2_file *fp = file->private_data;
 587         struct gfs2_holder *fl_gh = &fp->f_fl_gh;
 588
 589         mutex_lock(&fp->f_fl_mutex);
 590         flock_lock_file_wait(file, fl);
 591         if (fl_gh->gh_gl)
 592                 gfs2_glock_dq_uninit(fl_gh);
 593         mutex_unlock(&fp->f_fl_mutex);
 594 }
 595
 596 /**
 597  * gfs2_flock - acquire/release a flock lock on a file
 598  * @file: the file pointer
 599  * @cmd: either modify or retrieve lock state, possibly wait
 600  * @fl: type and range of lock
 601  *
 602  * Returns: errno
 603  */
 604
 605 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
 606 {
 607         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 608         struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
 609
 610         if (!(fl->fl_flags & FL_FLOCK))
 611                 return -ENOLCK;
 612         if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 613                 return -ENOLCK;
 614
 615         if (sdp->sd_args.ar_localflocks)
 616                 return flock_lock_file_wait(file, fl);
 617
 618         if (fl->fl_type == F_UNLCK) {
 619                 do_unflock(file, fl);
 620                 return 0;
 621         } else {
 622                 return do_flock(file, cmd, fl);
 623         }
 624 }
 625
 626 const struct file_operations gfs2_file_fops = {
 627         .llseek         = gfs2_llseek,
 628         .read           = do_sync_read,
 629         .aio_read       = generic_file_aio_read,
 630         .write          = do_sync_write,
 631         .aio_write      = generic_file_aio_write,
 632         .unlocked_ioctl = gfs2_ioctl,
 633         .mmap           = gfs2_mmap,
 634         .open           = gfs2_open,
 635         .release        = gfs2_close,
 636         .fsync          = gfs2_fsync,
 637         .lock           = gfs2_lock,
 638         .flock          = gfs2_flock,
 639         .splice_read    = generic_file_splice_read,
 640         .splice_write   = generic_file_splice_write,
 641 };
 642
 643 const struct file_operations gfs2_dir_fops = {
 644         .readdir        = gfs2_readdir,
 645         .unlocked_ioctl = gfs2_ioctl,
 646         .open           = gfs2_open,
 647         .release        = gfs2_close,
 648         .fsync          = gfs2_fsync,
 649         .lock           = gfs2_lock,
 650         .flock          = gfs2_flock,
 651 };
 652