fs/9p/vfs_file.c

   1 /*
   2  *  linux/fs/9p/vfs_file.c
   3  *
   4  * This file contians vfs file ops for 9P2000.
   5  *
   6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/sched.h>
  30 #include <linux/file.h>
  31 #include <linux/stat.h>
  32 #include <linux/string.h>
  33 #include <linux/inet.h>
  34 #include <linux/list.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/utsname.h>
  37 #include <asm/uaccess.h>
  38 #include <linux/idr.h>
  39 #include <net/9p/9p.h>
  40 #include <net/9p/client.h>
  41
  42 #include "v9fs.h"
  43 #include "v9fs_vfs.h"
  44 #include "fid.h"
  45 #include "cache.h"
  46
  47 static const struct vm_operations_struct v9fs_file_vm_ops;
  48
  49 /**
  50  * v9fs_file_open - open a file (or directory)
  51  * @inode: inode to be opened
  52  * @file: file being opened
  53  *
  54  */
  55
  56 int v9fs_file_open(struct inode *inode, struct file *file)
  57 {
  58         int err;
  59         struct v9fs_inode *v9inode;
  60         struct v9fs_session_info *v9ses;
  61         struct p9_fid *fid;
  62         int omode;
  63
  64         p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
  65         v9inode = V9FS_I(inode);
  66         v9ses = v9fs_inode2v9ses(inode);
  67         if (v9fs_proto_dotl(v9ses))
  68                 omode = v9fs_open_to_dotl_flags(file->f_flags);
  69         else
  70                 omode = v9fs_uflags2omode(file->f_flags,
  71                                         v9fs_proto_dotu(v9ses));
  72         fid = file->private_data;
  73         if (!fid) {
  74                 fid = v9fs_fid_clone(file->f_path.dentry);
  75                 if (IS_ERR(fid))
  76                         return PTR_ERR(fid);
  77
  78                 err = p9_client_open(fid, omode);
  79                 if (err < 0) {
  80                         p9_client_clunk(fid);
  81                         return err;
  82                 }
  83                 if ((file->f_flags & O_APPEND) &&
  84                         (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
  85                         generic_file_llseek(file, 0, SEEK_END);
  86         }
  87
  88         file->private_data = fid;
  89         mutex_lock(&v9inode->v_mutex);
  90         if (v9ses->cache && !v9inode->writeback_fid &&
  91             ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
  92                 /*
  93                  * clone a fid and add it to writeback_fid
  94                  * we do it during open time instead of
  95                  * page dirty time via write_begin/page_mkwrite
  96                  * because we want write after unlink usecase
  97                  * to work.
  98                  */
  99                 fid = v9fs_writeback_fid(file->f_path.dentry);
 100                 if (IS_ERR(fid)) {
 101                         err = PTR_ERR(fid);
 102                         mutex_unlock(&v9inode->v_mutex);
 103                         goto out_error;
 104                 }
 105                 v9inode->writeback_fid = (void *) fid;
 106         }
 107         mutex_unlock(&v9inode->v_mutex);
 108 #ifdef CONFIG_9P_FSCACHE
 109         if (v9ses->cache)
 110                 v9fs_cache_inode_set_cookie(inode, file);
 111 #endif
 112         return 0;
 113 out_error:
 114         p9_client_clunk(file->private_data);
 115         file->private_data = NULL;
 116         return err;
 117 }
 118
 119 /**
 120  * v9fs_file_lock - lock a file (or directory)
 121  * @filp: file to be locked
 122  * @cmd: lock command
 123  * @fl: file lock structure
 124  *
 125  * Bugs: this looks like a local only lock, we should extend into 9P
 126  *       by using open exclusive
 127  */
 128
 129 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
 130 {
 131         int res = 0;
 132         struct inode *inode = file_inode(filp);
 133
 134         p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
 135
 136         /* No mandatory locks */
 137         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 138                 return -ENOLCK;
 139
 140         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 141                 filemap_write_and_wait(inode->i_mapping);
 142                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 143         }
 144
 145         return res;
 146 }
 147
 148 static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
 149 {
 150         struct p9_flock flock;
 151         struct p9_fid *fid;
 152         uint8_t status;
 153         int res = 0;
 154         unsigned char fl_type;
 155
 156         fid = filp->private_data;
 157         BUG_ON(fid == NULL);
 158
 159         if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
 160                 BUG();
 161
 162         res = posix_lock_file_wait(filp, fl);
 163         if (res < 0)
 164                 goto out;
 165
 166         /* convert posix lock to p9 tlock args */
 167         memset(&flock, 0, sizeof(flock));
 168         /* map the lock type */
 169         switch (fl->fl_type) {
 170         case F_RDLCK:
 171                 flock.type = P9_LOCK_TYPE_RDLCK;
 172                 break;
 173         case F_WRLCK:
 174                 flock.type = P9_LOCK_TYPE_WRLCK;
 175                 break;
 176         case F_UNLCK:
 177                 flock.type = P9_LOCK_TYPE_UNLCK;
 178                 break;
 179         }
 180         flock.start = fl->fl_start;
 181         if (fl->fl_end == OFFSET_MAX)
 182                 flock.length = 0;
 183         else
 184                 flock.length = fl->fl_end - fl->fl_start + 1;
 185         flock.proc_id = fl->fl_pid;
 186         flock.client_id = utsname()->nodename;
 187         if (IS_SETLKW(cmd))
 188                 flock.flags = P9_LOCK_FLAGS_BLOCK;
 189
 190         /*
 191          * if its a blocked request and we get P9_LOCK_BLOCKED as the status
 192          * for lock request, keep on trying
 193          */
 194         for (;;) {
 195                 res = p9_client_lock_dotl(fid, &flock, &status);
 196                 if (res < 0)
 197                         break;
 198
 199                 if (status != P9_LOCK_BLOCKED)
 200                         break;
 201                 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
 202                         break;
 203                 if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
 204                         break;
 205         }
 206
 207         /* map 9p status to VFS status */
 208         switch (status) {
 209         case P9_LOCK_SUCCESS:
 210                 res = 0;
 211                 break;
 212         case P9_LOCK_BLOCKED:
 213                 res = -EAGAIN;
 214                 break;
 215         case P9_LOCK_ERROR:
 216         case P9_LOCK_GRACE:
 217                 res = -ENOLCK;
 218                 break;
 219         default:
 220                 BUG();
 221         }
 222
 223         /*
 224          * incase server returned error for lock request, revert
 225          * it locally
 226          */
 227         if (res < 0 && fl->fl_type != F_UNLCK) {
 228                 fl_type = fl->fl_type;
 229                 fl->fl_type = F_UNLCK;
 230                 res = posix_lock_file_wait(filp, fl);
 231                 fl->fl_type = fl_type;
 232         }
 233 out:
 234         return res;
 235 }
 236
 237 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
 238 {
 239         struct p9_getlock glock;
 240         struct p9_fid *fid;
 241         int res = 0;
 242
 243         fid = filp->private_data;
 244         BUG_ON(fid == NULL);
 245
 246         posix_test_lock(filp, fl);
 247         /*
 248          * if we have a conflicting lock locally, no need to validate
 249          * with server
 250          */
 251         if (fl->fl_type != F_UNLCK)
 252                 return res;
 253
 254         /* convert posix lock to p9 tgetlock args */
 255         memset(&glock, 0, sizeof(glock));
 256         glock.type  = P9_LOCK_TYPE_UNLCK;
 257         glock.start = fl->fl_start;
 258         if (fl->fl_end == OFFSET_MAX)
 259                 glock.length = 0;
 260         else
 261                 glock.length = fl->fl_end - fl->fl_start + 1;
 262         glock.proc_id = fl->fl_pid;
 263         glock.client_id = utsname()->nodename;
 264
 265         res = p9_client_getlock_dotl(fid, &glock);
 266         if (res < 0)
 267                 return res;
 268         /* map 9p lock type to os lock type */
 269         switch (glock.type) {
 270         case P9_LOCK_TYPE_RDLCK:
 271                 fl->fl_type = F_RDLCK;
 272                 break;
 273         case P9_LOCK_TYPE_WRLCK:
 274                 fl->fl_type = F_WRLCK;
 275                 break;
 276         case P9_LOCK_TYPE_UNLCK:
 277                 fl->fl_type = F_UNLCK;
 278                 break;
 279         }
 280         if (glock.type != P9_LOCK_TYPE_UNLCK) {
 281                 fl->fl_start = glock.start;
 282                 if (glock.length == 0)
 283                         fl->fl_end = OFFSET_MAX;
 284                 else
 285                         fl->fl_end = glock.start + glock.length - 1;
 286                 fl->fl_pid = glock.proc_id;
 287         }
 288         return res;
 289 }
 290
 291 /**
 292  * v9fs_file_lock_dotl - lock a file (or directory)
 293  * @filp: file to be locked
 294  * @cmd: lock command
 295  * @fl: file lock structure
 296  *
 297  */
 298
 299 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
 300 {
 301         struct inode *inode = file_inode(filp);
 302         int ret = -ENOLCK;
 303
 304         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n",
 305                  filp, cmd, fl, filp->f_path.dentry->d_name.name);
 306
 307         /* No mandatory locks */
 308         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 309                 goto out_err;
 310
 311         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 312                 filemap_write_and_wait(inode->i_mapping);
 313                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 314         }
 315
 316         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
 317                 ret = v9fs_file_do_lock(filp, cmd, fl);
 318         else if (IS_GETLK(cmd))
 319                 ret = v9fs_file_getlock(filp, fl);
 320         else
 321                 ret = -EINVAL;
 322 out_err:
 323         return ret;
 324 }
 325
 326 /**
 327  * v9fs_file_flock_dotl - lock a file
 328  * @filp: file to be locked
 329  * @cmd: lock command
 330  * @fl: file lock structure
 331  *
 332  */
 333
 334 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
 335         struct file_lock *fl)
 336 {
 337         struct inode *inode = file_inode(filp);
 338         int ret = -ENOLCK;
 339
 340         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n",
 341                  filp, cmd, fl, filp->f_path.dentry->d_name.name);
 342
 343         /* No mandatory locks */
 344         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 345                 goto out_err;
 346
 347         if (!(fl->fl_flags & FL_FLOCK))
 348                 goto out_err;
 349
 350         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 351                 filemap_write_and_wait(inode->i_mapping);
 352                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 353         }
 354         /* Convert flock to posix lock */
 355         fl->fl_owner = (fl_owner_t)filp;
 356         fl->fl_start = 0;
 357         fl->fl_end = OFFSET_MAX;
 358         fl->fl_flags |= FL_POSIX;
 359         fl->fl_flags ^= FL_FLOCK;
 360
 361         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
 362                 ret = v9fs_file_do_lock(filp, cmd, fl);
 363         else
 364                 ret = -EINVAL;
 365 out_err:
 366         return ret;
 367 }
 368
 369 /**
 370  * v9fs_fid_readn - read from a fid
 371  * @fid: fid to read
 372  * @data: data buffer to read data into
 373  * @udata: user data buffer to read data into
 374  * @count: size of buffer
 375  * @offset: offset at which to read data
 376  *
 377  */
 378 ssize_t
 379 v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
 380                u64 offset)
 381 {
 382         int n, total, size;
 383
 384         p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n",
 385                  fid->fid, (long long unsigned)offset, count);
 386         n = 0;
 387         total = 0;
 388         size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
 389         do {
 390                 n = p9_client_read(fid, data, udata, offset, count);
 391                 if (n <= 0)
 392                         break;
 393
 394                 if (data)
 395                         data += n;
 396                 if (udata)
 397                         udata += n;
 398
 399                 offset += n;
 400                 count -= n;
 401                 total += n;
 402         } while (count > 0 && n == size);
 403
 404         if (n < 0)
 405                 total = n;
 406
 407         return total;
 408 }
 409
 410 /**
 411  * v9fs_file_readn - read from a file
 412  * @filp: file pointer to read
 413  * @data: data buffer to read data into
 414  * @udata: user data buffer to read data into
 415  * @count: size of buffer
 416  * @offset: offset at which to read data
 417  *
 418  */
 419 ssize_t
 420 v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
 421                u64 offset)
 422 {
 423         return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
 424 }
 425
 426 /**
 427  * v9fs_file_read - read from a file
 428  * @filp: file pointer to read
 429  * @udata: user data buffer to read data into
 430  * @count: size of buffer
 431  * @offset: offset at which to read data
 432  *
 433  */
 434
 435 static ssize_t
 436 v9fs_file_read(struct file *filp, char __user *udata, size_t count,
 437                loff_t * offset)
 438 {
 439         int ret;
 440         struct p9_fid *fid;
 441         size_t size;
 442
 443         p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
 444         fid = filp->private_data;
 445
 446         size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
 447         if (count > size)
 448                 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
 449         else
 450                 ret = p9_client_read(fid, NULL, udata, *offset, count);
 451
 452         if (ret > 0)
 453                 *offset += ret;
 454
 455         return ret;
 456 }
 457
 458 ssize_t
 459 v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
 460                          const char __user *data, size_t count,
 461                          loff_t *offset, int invalidate)
 462 {
 463         int n;
 464         loff_t i_size;
 465         size_t total = 0;
 466         struct p9_client *clnt;
 467         loff_t origin = *offset;
 468         unsigned long pg_start, pg_end;
 469
 470         p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n",
 471                  data, (int)count, (int)*offset);
 472
 473         clnt = fid->clnt;
 474         do {
 475                 n = p9_client_write(fid, NULL, data+total, origin+total, count);
 476                 if (n <= 0)
 477                         break;
 478                 count -= n;
 479                 total += n;
 480         } while (count > 0);
 481
 482         if (invalidate && (total > 0)) {
 483                 pg_start = origin >> PAGE_CACHE_SHIFT;
 484                 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
 485                 if (inode->i_mapping && inode->i_mapping->nrpages)
 486                         invalidate_inode_pages2_range(inode->i_mapping,
 487                                                       pg_start, pg_end);
 488                 *offset += total;
 489                 i_size = i_size_read(inode);
 490                 if (*offset > i_size) {
 491                         inode_add_bytes(inode, *offset - i_size);
 492                         i_size_write(inode, *offset);
 493                 }
 494         }
 495         if (n < 0)
 496                 return n;
 497
 498         return total;
 499 }
 500
 501 /**
 502  * v9fs_file_write - write to a file
 503  * @filp: file pointer to write
 504  * @data: data buffer to write data from
 505  * @count: size of buffer
 506  * @offset: offset at which to write data
 507  *
 508  */
 509 static ssize_t
 510 v9fs_file_write(struct file *filp, const char __user * data,
 511                 size_t count, loff_t *offset)
 512 {
 513         ssize_t retval = 0;
 514         loff_t origin = *offset;
 515
 516
 517         retval = generic_write_checks(filp, &origin, &count, 0);
 518         if (retval)
 519                 goto out;
 520
 521         retval = -EINVAL;
 522         if ((ssize_t) count < 0)
 523                 goto out;
 524         retval = 0;
 525         if (!count)
 526                 goto out;
 527
 528         retval = v9fs_file_write_internal(file_inode(filp),
 529                                         filp->private_data,
 530                                         data, count, &origin, 1);
 531         /* update offset on successful write */
 532         if (retval > 0)
 533                 *offset = origin;
 534 out:
 535         return retval;
 536 }
 537
 538
 539 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
 540                            int datasync)
 541 {
 542         struct p9_fid *fid;
 543         struct inode *inode = filp->f_mapping->host;
 544         struct p9_wstat wstat;
 545         int retval;
 546
 547         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 548         if (retval)
 549                 return retval;
 550
 551         mutex_lock(&inode->i_mutex);
 552         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 553
 554         fid = filp->private_data;
 555         v9fs_blank_wstat(&wstat);
 556
 557         retval = p9_client_wstat(fid, &wstat);
 558         mutex_unlock(&inode->i_mutex);
 559
 560         return retval;
 561 }
 562
 563 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 564                          int datasync)
 565 {
 566         struct p9_fid *fid;
 567         struct inode *inode = filp->f_mapping->host;
 568         int retval;
 569
 570         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 571         if (retval)
 572                 return retval;
 573
 574         mutex_lock(&inode->i_mutex);
 575         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 576
 577         fid = filp->private_data;
 578
 579         retval = p9_client_fsync(fid, datasync);
 580         mutex_unlock(&inode->i_mutex);
 581
 582         return retval;
 583 }
 584
 585 static int
 586 v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 587 {
 588         int retval;
 589
 590         retval = generic_file_mmap(file, vma);
 591         if (!retval)
 592                 vma->vm_ops = &v9fs_file_vm_ops;
 593
 594         return retval;
 595 }
 596
 597 static int
 598 v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 599 {
 600         struct v9fs_inode *v9inode;
 601         struct page *page = vmf->page;
 602         struct file *filp = vma->vm_file;
 603         struct inode *inode = file_inode(filp);
 604
 605
 606         p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
 607                  page, (unsigned long)filp->private_data);
 608
 609         /* Update file times before taking page lock */
 610         file_update_time(filp);
 611
 612         v9inode = V9FS_I(inode);
 613         /* make sure the cache has finished storing the page */
 614         v9fs_fscache_wait_on_page_write(inode, page);
 615         BUG_ON(!v9inode->writeback_fid);
 616         lock_page(page);
 617         if (page->mapping != inode->i_mapping)
 618                 goto out_unlock;
 619         wait_for_stable_page(page);
 620
 621         return VM_FAULT_LOCKED;
 622 out_unlock:
 623         unlock_page(page);
 624         return VM_FAULT_NOPAGE;
 625 }
 626
 627 static ssize_t
 628 v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
 629                  loff_t *offsetp)
 630 {
 631         loff_t size, offset;
 632         struct inode *inode;
 633         struct address_space *mapping;
 634
 635         offset = *offsetp;
 636         mapping = filp->f_mapping;
 637         inode = mapping->host;
 638         if (!count)
 639                 return 0;
 640         size = i_size_read(inode);
 641         if (offset < size)
 642                 filemap_write_and_wait_range(mapping, offset,
 643                                              offset + count - 1);
 644
 645         return v9fs_file_read(filp, udata, count, offsetp);
 646 }
 647
 648 /**
 649  * v9fs_cached_file_read - read from a file
 650  * @filp: file pointer to read
 651  * @udata: user data buffer to read data into
 652  * @count: size of buffer
 653  * @offset: offset at which to read data
 654  *
 655  */
 656 static ssize_t
 657 v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
 658                       loff_t *offset)
 659 {
 660         if (filp->f_flags & O_DIRECT)
 661                 return v9fs_direct_read(filp, data, count, offset);
 662         return do_sync_read(filp, data, count, offset);
 663 }
 664
 665 static ssize_t
 666 v9fs_direct_write(struct file *filp, const char __user * data,
 667                   size_t count, loff_t *offsetp)
 668 {
 669         loff_t offset;
 670         ssize_t retval;
 671         struct inode *inode;
 672         struct address_space *mapping;
 673
 674         offset = *offsetp;
 675         mapping = filp->f_mapping;
 676         inode = mapping->host;
 677         if (!count)
 678                 return 0;
 679
 680         mutex_lock(&inode->i_mutex);
 681         retval = filemap_write_and_wait_range(mapping, offset,
 682                                               offset + count - 1);
 683         if (retval)
 684                 goto err_out;
 685         /*
 686          * After a write we want buffered reads to be sure to go to disk to get
 687          * the new data.  We invalidate clean cached page from the region we're
 688          * about to write.  We do this *before* the write so that if we fail
 689          * here we fall back to buffered write
 690          */
 691         if (mapping->nrpages) {
 692                 pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
 693                 pgoff_t pg_end   = (offset + count - 1) >> PAGE_CACHE_SHIFT;
 694
 695                 retval = invalidate_inode_pages2_range(mapping,
 696                                                         pg_start, pg_end);
 697                 /*
 698                  * If a page can not be invalidated, fall back
 699                  * to buffered write.
 700                  */
 701                 if (retval) {
 702                         if (retval == -EBUSY)
 703                                 goto buff_write;
 704                         goto err_out;
 705                 }
 706         }
 707         retval = v9fs_file_write(filp, data, count, offsetp);
 708 err_out:
 709         mutex_unlock(&inode->i_mutex);
 710         return retval;
 711
 712 buff_write:
 713         mutex_unlock(&inode->i_mutex);
 714         return do_sync_write(filp, data, count, offsetp);
 715 }
 716
 717 /**
 718  * v9fs_cached_file_write - write to a file
 719  * @filp: file pointer to write
 720  * @data: data buffer to write data from
 721  * @count: size of buffer
 722  * @offset: offset at which to write data
 723  *
 724  */
 725 static ssize_t
 726 v9fs_cached_file_write(struct file *filp, const char __user * data,
 727                        size_t count, loff_t *offset)
 728 {
 729
 730         if (filp->f_flags & O_DIRECT)
 731                 return v9fs_direct_write(filp, data, count, offset);
 732         return do_sync_write(filp, data, count, offset);
 733 }
 734
 735 static const struct vm_operations_struct v9fs_file_vm_ops = {
 736         .fault = filemap_fault,
 737         .page_mkwrite = v9fs_vm_page_mkwrite,
 738         .remap_pages = generic_file_remap_pages,
 739 };
 740
 741
 742 const struct file_operations v9fs_cached_file_operations = {
 743         .llseek = generic_file_llseek,
 744         .read = v9fs_cached_file_read,
 745         .write = v9fs_cached_file_write,
 746         .aio_read = generic_file_aio_read,
 747         .aio_write = generic_file_aio_write,
 748         .open = v9fs_file_open,
 749         .release = v9fs_dir_release,
 750         .lock = v9fs_file_lock,
 751         .mmap = v9fs_file_mmap,
 752         .fsync = v9fs_file_fsync,
 753 };
 754
 755 const struct file_operations v9fs_cached_file_operations_dotl = {
 756         .llseek = generic_file_llseek,
 757         .read = v9fs_cached_file_read,
 758         .write = v9fs_cached_file_write,
 759         .aio_read = generic_file_aio_read,
 760         .aio_write = generic_file_aio_write,
 761         .open = v9fs_file_open,
 762         .release = v9fs_dir_release,
 763         .lock = v9fs_file_lock_dotl,
 764         .flock = v9fs_file_flock_dotl,
 765         .mmap = v9fs_file_mmap,
 766         .fsync = v9fs_file_fsync_dotl,
 767 };
 768
 769 const struct file_operations v9fs_file_operations = {
 770         .llseek = generic_file_llseek,
 771         .read = v9fs_file_read,
 772         .write = v9fs_file_write,
 773         .open = v9fs_file_open,
 774         .release = v9fs_dir_release,
 775         .lock = v9fs_file_lock,
 776         .mmap = generic_file_readonly_mmap,
 777         .fsync = v9fs_file_fsync,
 778 };
 779
 780 const struct file_operations v9fs_file_operations_dotl = {
 781         .llseek = generic_file_llseek,
 782         .read = v9fs_file_read,
 783         .write = v9fs_file_write,
 784         .open = v9fs_file_open,
 785         .release = v9fs_dir_release,
 786         .lock = v9fs_file_lock_dotl,
 787         .flock = v9fs_file_flock_dotl,
 788         .mmap = generic_file_readonly_mmap,
 789         .fsync = v9fs_file_fsync_dotl,
 790 };