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/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/uio.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/mm.h>
  19 #include <linux/smp_lock.h>
  20 #include <linux/fs.h>
  21 #include <linux/gfs2_ondisk.h>
  22 #include <linux/ext2_fs.h>
  23 #include <linux/crc32.h>
  24 #include <linux/lm_interface.h>
  25 #include <linux/writeback.h>
  26 #include <asm/uaccess.h>
  27
  28 #include "gfs2.h"
  29 #include "incore.h"
  30 #include "bmap.h"
  31 #include "dir.h"
  32 #include "glock.h"
  33 #include "glops.h"
  34 #include "inode.h"
  35 #include "lm.h"
  36 #include "log.h"
  37 #include "meta_io.h"
  38 #include "ops_file.h"
  39 #include "ops_vm.h"
  40 #include "quota.h"
  41 #include "rgrp.h"
  42 #include "trans.h"
  43 #include "util.h"
  44 #include "eaops.h"
  45
  46 /* For regular, non-NFS */
  47 struct filldir_reg {
  48         struct gfs2_sbd *fdr_sbd;
  49         int fdr_prefetch;
  50
  51         filldir_t fdr_filldir;
  52         void *fdr_opaque;
  53 };
  54
  55 /*
  56  * Most fields left uninitialised to catch anybody who tries to
  57  * use them. f_flags set to prevent file_accessed() from touching
  58  * any other part of this. Its use is purely as a flag so that we
  59  * know (in readpage()) whether or not do to locking.
  60  */
  61 struct file gfs2_internal_file_sentinel = {
  62         .f_flags = O_NOATIME|O_RDONLY,
  63 };
  64
  65 static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
  66                            unsigned long offset, unsigned long size)
  67 {
  68         char *kaddr;
  69         unsigned long count = desc->count;
  70
  71         if (size > count)
  72                 size = count;
  73
  74         kaddr = kmap(page);
  75         memcpy(desc->arg.data, kaddr + offset, size);
  76         kunmap(page);
  77
  78         desc->count = count - size;
  79         desc->written += size;
  80         desc->arg.buf += size;
  81         return size;
  82 }
  83
  84 int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
  85                        char *buf, loff_t *pos, unsigned size)
  86 {
  87         struct inode *inode = &ip->i_inode;
  88         read_descriptor_t desc;
  89         desc.written = 0;
  90         desc.arg.data = buf;
  91         desc.count = size;
  92         desc.error = 0;
  93         do_generic_mapping_read(inode->i_mapping, ra_state,
  94                                 &gfs2_internal_file_sentinel, pos, &desc,
  95                                 gfs2_read_actor);
  96         return desc.written ? desc.written : desc.error;
  97 }
  98
  99 /**
 100  * gfs2_llseek - seek to a location in a file
 101  * @file: the file
 102  * @offset: the offset
 103  * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
 104  *
 105  * SEEK_END requires the glock for the file because it references the
 106  * file's size.
 107  *
 108  * Returns: The new offset, or errno
 109  */
 110
 111 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
 112 {
 113         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 114         struct gfs2_holder i_gh;
 115         loff_t error;
 116
 117         if (origin == 2) {
 118                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
 119                                            &i_gh);
 120                 if (!error) {
 121                         error = remote_llseek(file, offset, origin);
 122                         gfs2_glock_dq_uninit(&i_gh);
 123                 }
 124         } else
 125                 error = remote_llseek(file, offset, origin);
 126
 127         return error;
 128 }
 129
 130 /**
 131  * filldir_func - Report a directory entry to the caller of gfs2_dir_read()
 132  * @opaque: opaque data used by the function
 133  * @name: the name of the directory entry
 134  * @length: the length of the name
 135  * @offset: the entry's offset in the directory
 136  * @inum: the inode number the entry points to
 137  * @type: the type of inode the entry points to
 138  *
 139  * Returns: 0 on success, 1 if buffer full
 140  */
 141
 142 static int filldir_func(void *opaque, const char *name, unsigned int length,
 143                         u64 offset, struct gfs2_inum_host *inum,
 144                         unsigned int type)
 145 {
 146         struct filldir_reg *fdr = (struct filldir_reg *)opaque;
 147         struct gfs2_sbd *sdp = fdr->fdr_sbd;
 148         int error;
 149
 150         error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset,
 151                                  inum->no_addr, type);
 152         if (error)
 153                 return 1;
 154
 155         if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) {
 156                 gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_inode_glops,
 157                                        LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY);
 158                 gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_iopen_glops,
 159                                        LM_ST_SHARED, LM_FLAG_TRY);
 160         }
 161
 162         return 0;
 163 }
 164
 165 /**
 166  * gfs2_readdir - Read directory entries from a directory
 167  * @file: The directory to read from
 168  * @dirent: Buffer for dirents
 169  * @filldir: Function used to do the copying
 170  *
 171  * Returns: errno
 172  */
 173
 174 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
 175 {
 176         struct inode *dir = file->f_mapping->host;
 177         struct gfs2_inode *dip = GFS2_I(dir);
 178         struct filldir_reg fdr;
 179         struct gfs2_holder d_gh;
 180         u64 offset = file->f_pos;
 181         int error;
 182
 183         fdr.fdr_sbd = GFS2_SB(dir);
 184         fdr.fdr_prefetch = 1;
 185         fdr.fdr_filldir = filldir;
 186         fdr.fdr_opaque = dirent;
 187
 188         gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
 189         error = gfs2_glock_nq_atime(&d_gh);
 190         if (error) {
 191                 gfs2_holder_uninit(&d_gh);
 192                 return error;
 193         }
 194
 195         error = gfs2_dir_read(dir, &offset, &fdr, filldir_func);
 196
 197         gfs2_glock_dq_uninit(&d_gh);
 198
 199         file->f_pos = offset;
 200
 201         return error;
 202 }
 203
 204 /**
 205  * fsflags_cvt
 206  * @table: A table of 32 u32 flags
 207  * @val: a 32 bit value to convert
 208  *
 209  * This function can be used to convert between fsflags values and
 210  * GFS2's own flags values.
 211  *
 212  * Returns: the converted flags
 213  */
 214 static u32 fsflags_cvt(const u32 *table, u32 val)
 215 {
 216         u32 res = 0;
 217         while(val) {
 218                 if (val & 1)
 219                         res |= *table;
 220                 table++;
 221                 val >>= 1;
 222         }
 223         return res;
 224 }
 225
 226 static const u32 fsflags_to_gfs2[32] = {
 227         [3] = GFS2_DIF_SYNC,
 228         [4] = GFS2_DIF_IMMUTABLE,
 229         [5] = GFS2_DIF_APPENDONLY,
 230         [7] = GFS2_DIF_NOATIME,
 231         [12] = GFS2_DIF_EXHASH,
 232         [14] = GFS2_DIF_JDATA,
 233         [20] = GFS2_DIF_DIRECTIO,
 234 };
 235
 236 static const u32 gfs2_to_fsflags[32] = {
 237         [gfs2fl_Sync] = FS_SYNC_FL,
 238         [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
 239         [gfs2fl_AppendOnly] = FS_APPEND_FL,
 240         [gfs2fl_NoAtime] = FS_NOATIME_FL,
 241         [gfs2fl_ExHash] = FS_INDEX_FL,
 242         [gfs2fl_Jdata] = FS_JOURNAL_DATA_FL,
 243         [gfs2fl_Directio] = FS_DIRECTIO_FL,
 244         [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL,
 245         [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
 246 };
 247
 248 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
 249 {
 250         struct inode *inode = filp->f_path.dentry->d_inode;
 251         struct gfs2_inode *ip = GFS2_I(inode);
 252         struct gfs2_holder gh;
 253         int error;
 254         u32 fsflags;
 255
 256         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
 257         error = gfs2_glock_nq_atime(&gh);
 258         if (error)
 259                 return error;
 260
 261         fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
 262         if (put_user(fsflags, ptr))
 263                 error = -EFAULT;
 264
 265         gfs2_glock_dq_m(1, &gh);
 266         gfs2_holder_uninit(&gh);
 267         return error;
 268 }
 269
 270 void gfs2_set_inode_flags(struct inode *inode)
 271 {
 272         struct gfs2_inode *ip = GFS2_I(inode);
 273         struct gfs2_dinode_host *di = &ip->i_di;
 274         unsigned int flags = inode->i_flags;
 275
 276         flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
 277         if (di->di_flags & GFS2_DIF_IMMUTABLE)
 278                 flags |= S_IMMUTABLE;
 279         if (di->di_flags & GFS2_DIF_APPENDONLY)
 280                 flags |= S_APPEND;
 281         if (di->di_flags & GFS2_DIF_NOATIME)
 282                 flags |= S_NOATIME;
 283         if (di->di_flags & GFS2_DIF_SYNC)
 284                 flags |= S_SYNC;
 285         inode->i_flags = flags;
 286 }
 287
 288 /* Flags that can be set by user space */
 289 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA|                    \
 290                              GFS2_DIF_DIRECTIO|                 \
 291                              GFS2_DIF_IMMUTABLE|                \
 292                              GFS2_DIF_APPENDONLY|               \
 293                              GFS2_DIF_NOATIME|                  \
 294                              GFS2_DIF_SYNC|                     \
 295                              GFS2_DIF_SYSTEM|                   \
 296                              GFS2_DIF_INHERIT_DIRECTIO|         \
 297                              GFS2_DIF_INHERIT_JDATA)
 298
 299 /**
 300  * gfs2_set_flags - set flags on an inode
 301  * @inode: The inode
 302  * @flags: The flags to set
 303  * @mask: Indicates which flags are valid
 304  *
 305  */
 306 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
 307 {
 308         struct inode *inode = filp->f_path.dentry->d_inode;
 309         struct gfs2_inode *ip = GFS2_I(inode);
 310         struct gfs2_sbd *sdp = GFS2_SB(inode);
 311         struct buffer_head *bh;
 312         struct gfs2_holder gh;
 313         int error;
 314         u32 new_flags, flags;
 315
 316         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 317         if (error)
 318                 return error;
 319
 320         flags = ip->i_di.di_flags;
 321         new_flags = (flags & ~mask) | (reqflags & mask);
 322         if ((new_flags ^ flags) == 0)
 323                 goto out;
 324
 325         if (S_ISDIR(inode->i_mode)) {
 326                 if ((new_flags ^ flags) & GFS2_DIF_JDATA)
 327                         new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA);
 328                 if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO)
 329                         new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO);
 330         }
 331
 332         error = -EINVAL;
 333         if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
 334                 goto out;
 335
 336         error = -EPERM;
 337         if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
 338                 goto out;
 339         if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
 340                 goto out;
 341         if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
 342             !capable(CAP_LINUX_IMMUTABLE))
 343                 goto out;
 344         if (!IS_IMMUTABLE(inode)) {
 345                 error = permission(inode, MAY_WRITE, NULL);
 346                 if (error)
 347                         goto out;
 348         }
 349
 350         error = gfs2_trans_begin(sdp, RES_DINODE, 0);
 351         if (error)
 352                 goto out;
 353         error = gfs2_meta_inode_buffer(ip, &bh);
 354         if (error)
 355                 goto out_trans_end;
 356         gfs2_trans_add_bh(ip->i_gl, bh, 1);
 357         ip->i_di.di_flags = new_flags;
 358         gfs2_dinode_out(ip, bh->b_data);
 359         brelse(bh);
 360         gfs2_set_inode_flags(inode);
 361 out_trans_end:
 362         gfs2_trans_end(sdp);
 363 out:
 364         gfs2_glock_dq_uninit(&gh);
 365         return error;
 366 }
 367
 368 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
 369 {
 370         u32 fsflags, gfsflags;
 371         if (get_user(fsflags, ptr))
 372                 return -EFAULT;
 373         gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
 374         return do_gfs2_set_flags(filp, gfsflags, ~0);
 375 }
 376
 377 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 378 {
 379         switch(cmd) {
 380         case FS_IOC_GETFLAGS:
 381                 return gfs2_get_flags(filp, (u32 __user *)arg);
 382         case FS_IOC_SETFLAGS:
 383                 return gfs2_set_flags(filp, (u32 __user *)arg);
 384         }
 385         return -ENOTTY;
 386 }
 387
 388
 389 /**
 390  * gfs2_mmap -
 391  * @file: The file to map
 392  * @vma: The VMA which described the mapping
 393  *
 394  * Returns: 0 or error code
 395  */
 396
 397 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
 398 {
 399         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 400         struct gfs2_holder i_gh;
 401         int error;
 402
 403         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
 404         error = gfs2_glock_nq_atime(&i_gh);
 405         if (error) {
 406                 gfs2_holder_uninit(&i_gh);
 407                 return error;
 408         }
 409
 410         /* This is VM_MAYWRITE instead of VM_WRITE because a call
 411            to mprotect() can turn on VM_WRITE later. */
 412
 413         if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
 414             (VM_MAYSHARE | VM_MAYWRITE))
 415                 vma->vm_ops = &gfs2_vm_ops_sharewrite;
 416         else
 417                 vma->vm_ops = &gfs2_vm_ops_private;
 418
 419         gfs2_glock_dq_uninit(&i_gh);
 420
 421         return error;
 422 }
 423
 424 /**
 425  * gfs2_open - open a file
 426  * @inode: the inode to open
 427  * @file: the struct file for this opening
 428  *
 429  * Returns: errno
 430  */
 431
 432 static int gfs2_open(struct inode *inode, struct file *file)
 433 {
 434         struct gfs2_inode *ip = GFS2_I(inode);
 435         struct gfs2_holder i_gh;
 436         struct gfs2_file *fp;
 437         int error;
 438
 439         fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
 440         if (!fp)
 441                 return -ENOMEM;
 442
 443         mutex_init(&fp->f_fl_mutex);
 444
 445         gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
 446         file->private_data = fp;
 447
 448         if (S_ISREG(ip->i_inode.i_mode)) {
 449                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
 450                                            &i_gh);
 451                 if (error)
 452                         goto fail;
 453
 454                 if (!(file->f_flags & O_LARGEFILE) &&
 455                     ip->i_di.di_size > MAX_NON_LFS) {
 456                         error = -EFBIG;
 457                         goto fail_gunlock;
 458                 }
 459
 460                 /* Listen to the Direct I/O flag */
 461
 462                 if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
 463                         file->f_flags |= O_DIRECT;
 464
 465                 gfs2_glock_dq_uninit(&i_gh);
 466         }
 467
 468         return 0;
 469
 470 fail_gunlock:
 471         gfs2_glock_dq_uninit(&i_gh);
 472 fail:
 473         file->private_data = NULL;
 474         kfree(fp);
 475         return error;
 476 }
 477
 478 /**
 479  * gfs2_close - called to close a struct file
 480  * @inode: the inode the struct file belongs to
 481  * @file: the struct file being closed
 482  *
 483  * Returns: errno
 484  */
 485
 486 static int gfs2_close(struct inode *inode, struct file *file)
 487 {
 488         struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
 489         struct gfs2_file *fp;
 490
 491         fp = file->private_data;
 492         file->private_data = NULL;
 493
 494         if (gfs2_assert_warn(sdp, fp))
 495                 return -EIO;
 496
 497         kfree(fp);
 498
 499         return 0;
 500 }
 501
 502 /**
 503  * gfs2_fsync - sync the dirty data for a file (across the cluster)
 504  * @file: the file that points to the dentry (we ignore this)
 505  * @dentry: the dentry that points to the inode to sync
 506  *
 507  * The VFS will flush "normal" data for us. We only need to worry
 508  * about metadata here. For journaled data, we just do a log flush
 509  * as we can't avoid it. Otherwise we can just bale out if datasync
 510  * is set. For stuffed inodes we must flush the log in order to
 511  * ensure that all data is on disk.
 512  *
 513  * The call to write_inode_now() is there to write back metadata and
 514  * the inode itself. It does also try and write the data, but thats
 515  * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
 516  * for us.
 517  *
 518  * Returns: errno
 519  */
 520
 521 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
 522 {
 523         struct inode *inode = dentry->d_inode;
 524         int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
 525         int ret = 0;
 526
 527         if (gfs2_is_jdata(GFS2_I(inode))) {
 528                 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
 529                 return 0;
 530         }
 531
 532         if (sync_state != 0) {
 533                 if (!datasync)
 534                         ret = write_inode_now(inode, 0);
 535
 536                 if (gfs2_is_stuffed(GFS2_I(inode)))
 537                         gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
 538         }
 539
 540         return ret;
 541 }
 542
 543 /**
 544  * gfs2_lock - acquire/release a posix lock on a file
 545  * @file: the file pointer
 546  * @cmd: either modify or retrieve lock state, possibly wait
 547  * @fl: type and range of lock
 548  *
 549  * Returns: errno
 550  */
 551
 552 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
 553 {
 554         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 555         struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
 556         struct lm_lockname name =
 557                 { .ln_number = ip->i_num.no_addr,
 558                   .ln_type = LM_TYPE_PLOCK };
 559
 560         if (!(fl->fl_flags & FL_POSIX))
 561                 return -ENOLCK;
 562         if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 563                 return -ENOLCK;
 564
 565         if (sdp->sd_args.ar_localflocks) {
 566                 if (IS_GETLK(cmd)) {
 567                         struct file_lock tmp;
 568                         int ret;
 569                         ret = posix_test_lock(file, fl, &tmp);
 570                         fl->fl_type = F_UNLCK;
 571                         if (ret)
 572                                 memcpy(fl, &tmp, sizeof(struct file_lock));
 573                         return 0;
 574                 } else {
 575                         return posix_lock_file_wait(file, fl);
 576                 }
 577         }
 578
 579         if (IS_GETLK(cmd))
 580                 return gfs2_lm_plock_get(sdp, &name, file, fl);
 581         else if (fl->fl_type == F_UNLCK)
 582                 return gfs2_lm_punlock(sdp, &name, file, fl);
 583         else
 584                 return gfs2_lm_plock(sdp, &name, file, cmd, fl);
 585 }
 586
 587 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
 588 {
 589         struct gfs2_file *fp = file->private_data;
 590         struct gfs2_holder *fl_gh = &fp->f_fl_gh;
 591         struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
 592         struct gfs2_glock *gl;
 593         unsigned int state;
 594         int flags;
 595         int error = 0;
 596
 597         state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
 598         flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
 599
 600         mutex_lock(&fp->f_fl_mutex);
 601
 602         gl = fl_gh->gh_gl;
 603         if (gl) {
 604                 if (fl_gh->gh_state == state)
 605                         goto out;
 606                 gfs2_glock_hold(gl);
 607                 flock_lock_file_wait(file,
 608                                      &(struct file_lock){.fl_type = F_UNLCK});
 609                 gfs2_glock_dq_uninit(fl_gh);
 610         } else {
 611                 error = gfs2_glock_get(GFS2_SB(&ip->i_inode),
 612                                       ip->i_num.no_addr, &gfs2_flock_glops,
 613                                       CREATE, &gl);
 614                 if (error)
 615                         goto out;
 616         }
 617
 618         gfs2_holder_init(gl, state, flags, fl_gh);
 619         gfs2_glock_put(gl);
 620
 621         error = gfs2_glock_nq(fl_gh);
 622         if (error) {
 623                 gfs2_holder_uninit(fl_gh);
 624                 if (error == GLR_TRYFAILED)
 625                         error = -EAGAIN;
 626         } else {
 627                 error = flock_lock_file_wait(file, fl);
 628                 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
 629         }
 630
 631 out:
 632         mutex_unlock(&fp->f_fl_mutex);
 633         return error;
 634 }
 635
 636 static void do_unflock(struct file *file, struct file_lock *fl)
 637 {
 638         struct gfs2_file *fp = file->private_data;
 639         struct gfs2_holder *fl_gh = &fp->f_fl_gh;
 640
 641         mutex_lock(&fp->f_fl_mutex);
 642         flock_lock_file_wait(file, fl);
 643         if (fl_gh->gh_gl)
 644                 gfs2_glock_dq_uninit(fl_gh);
 645         mutex_unlock(&fp->f_fl_mutex);
 646 }
 647
 648 /**
 649  * gfs2_flock - acquire/release a flock lock on a file
 650  * @file: the file pointer
 651  * @cmd: either modify or retrieve lock state, possibly wait
 652  * @fl: type and range of lock
 653  *
 654  * Returns: errno
 655  */
 656
 657 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
 658 {
 659         struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
 660         struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
 661
 662         if (!(fl->fl_flags & FL_FLOCK))
 663                 return -ENOLCK;
 664         if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 665                 return -ENOLCK;
 666
 667         if (sdp->sd_args.ar_localflocks)
 668                 return flock_lock_file_wait(file, fl);
 669
 670         if (fl->fl_type == F_UNLCK) {
 671                 do_unflock(file, fl);
 672                 return 0;
 673         } else {
 674                 return do_flock(file, cmd, fl);
 675         }
 676 }
 677
 678 const struct file_operations gfs2_file_fops = {
 679         .llseek         = gfs2_llseek,
 680         .read           = do_sync_read,
 681         .aio_read       = generic_file_aio_read,
 682         .write          = do_sync_write,
 683         .aio_write      = generic_file_aio_write,
 684         .unlocked_ioctl = gfs2_ioctl,
 685         .mmap           = gfs2_mmap,
 686         .open           = gfs2_open,
 687         .release        = gfs2_close,
 688         .fsync          = gfs2_fsync,
 689         .lock           = gfs2_lock,
 690         .sendfile       = generic_file_sendfile,
 691         .flock          = gfs2_flock,
 692         .splice_read    = generic_file_splice_read,
 693         .splice_write   = generic_file_splice_write,
 694 };
 695
 696 const struct file_operations gfs2_dir_fops = {
 697         .readdir        = gfs2_readdir,
 698         .unlocked_ioctl = gfs2_ioctl,
 699         .open           = gfs2_open,
 700         .release        = gfs2_close,
 701         .fsync          = gfs2_fsync,
 702         .lock           = gfs2_lock,
 703         .flock          = gfs2_flock,
 704 };
 705