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_DPRINTK(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 = 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_TRUNC) {
  84                         i_size_write(inode, 0);
  85                         inode->i_blocks = 0;
  86                 }
  87                 if ((file->f_flags & O_APPEND) &&
  88                         (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
  89                         generic_file_llseek(file, 0, SEEK_END);
  90         }
  91
  92         file->private_data = fid;
  93         mutex_lock(&v9inode->v_mutex);
  94         if (v9ses->cache && !v9inode->writeback_fid &&
  95             ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
  96                 /*
  97                  * clone a fid and add it to writeback_fid
  98                  * we do it during open time instead of
  99                  * page dirty time via write_begin/page_mkwrite
 100                  * because we want write after unlink usecase
 101                  * to work.
 102                  */
 103                 fid = v9fs_writeback_fid(file->f_path.dentry);
 104                 if (IS_ERR(fid)) {
 105                         err = PTR_ERR(fid);
 106                         mutex_unlock(&v9inode->v_mutex);
 107                         goto out_error;
 108                 }
 109                 v9inode->writeback_fid = (void *) fid;
 110         }
 111         mutex_unlock(&v9inode->v_mutex);
 112 #ifdef CONFIG_9P_FSCACHE
 113         if (v9ses->cache)
 114                 v9fs_cache_inode_set_cookie(inode, file);
 115 #endif
 116         return 0;
 117 out_error:
 118         p9_client_clunk(file->private_data);
 119         file->private_data = NULL;
 120         return err;
 121 }
 122
 123 /**
 124  * v9fs_file_lock - lock a file (or directory)
 125  * @filp: file to be locked
 126  * @cmd: lock command
 127  * @fl: file lock structure
 128  *
 129  * Bugs: this looks like a local only lock, we should extend into 9P
 130  *       by using open exclusive
 131  */
 132
 133 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
 134 {
 135         int res = 0;
 136         struct inode *inode = filp->f_path.dentry->d_inode;
 137
 138         P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
 139
 140         /* No mandatory locks */
 141         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 142                 return -ENOLCK;
 143
 144         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 145                 filemap_write_and_wait(inode->i_mapping);
 146                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 147         }
 148
 149         return res;
 150 }
 151
 152 static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
 153 {
 154         struct p9_flock flock;
 155         struct p9_fid *fid;
 156         uint8_t status;
 157         int res = 0;
 158         unsigned char fl_type;
 159
 160         fid = filp->private_data;
 161         BUG_ON(fid == NULL);
 162
 163         if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
 164                 BUG();
 165
 166         res = posix_lock_file_wait(filp, fl);
 167         if (res < 0)
 168                 goto out;
 169
 170         /* convert posix lock to p9 tlock args */
 171         memset(&flock, 0, sizeof(flock));
 172         flock.type = fl->fl_type;
 173         flock.start = fl->fl_start;
 174         if (fl->fl_end == OFFSET_MAX)
 175                 flock.length = 0;
 176         else
 177                 flock.length = fl->fl_end - fl->fl_start + 1;
 178         flock.proc_id = fl->fl_pid;
 179         flock.client_id = utsname()->nodename;
 180         if (IS_SETLKW(cmd))
 181                 flock.flags = P9_LOCK_FLAGS_BLOCK;
 182
 183         /*
 184          * if its a blocked request and we get P9_LOCK_BLOCKED as the status
 185          * for lock request, keep on trying
 186          */
 187         for (;;) {
 188                 res = p9_client_lock_dotl(fid, &flock, &status);
 189                 if (res < 0)
 190                         break;
 191
 192                 if (status != P9_LOCK_BLOCKED)
 193                         break;
 194                 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
 195                         break;
 196                 schedule_timeout_interruptible(P9_LOCK_TIMEOUT);
 197         }
 198
 199         /* map 9p status to VFS status */
 200         switch (status) {
 201         case P9_LOCK_SUCCESS:
 202                 res = 0;
 203                 break;
 204         case P9_LOCK_BLOCKED:
 205                 res = -EAGAIN;
 206                 break;
 207         case P9_LOCK_ERROR:
 208         case P9_LOCK_GRACE:
 209                 res = -ENOLCK;
 210                 break;
 211         default:
 212                 BUG();
 213         }
 214
 215         /*
 216          * incase server returned error for lock request, revert
 217          * it locally
 218          */
 219         if (res < 0 && fl->fl_type != F_UNLCK) {
 220                 fl_type = fl->fl_type;
 221                 fl->fl_type = F_UNLCK;
 222                 res = posix_lock_file_wait(filp, fl);
 223                 fl->fl_type = fl_type;
 224         }
 225 out:
 226         return res;
 227 }
 228
 229 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
 230 {
 231         struct p9_getlock glock;
 232         struct p9_fid *fid;
 233         int res = 0;
 234
 235         fid = filp->private_data;
 236         BUG_ON(fid == NULL);
 237
 238         posix_test_lock(filp, fl);
 239         /*
 240          * if we have a conflicting lock locally, no need to validate
 241          * with server
 242          */
 243         if (fl->fl_type != F_UNLCK)
 244                 return res;
 245
 246         /* convert posix lock to p9 tgetlock args */
 247         memset(&glock, 0, sizeof(glock));
 248         glock.type = fl->fl_type;
 249         glock.start = fl->fl_start;
 250         if (fl->fl_end == OFFSET_MAX)
 251                 glock.length = 0;
 252         else
 253                 glock.length = fl->fl_end - fl->fl_start + 1;
 254         glock.proc_id = fl->fl_pid;
 255         glock.client_id = utsname()->nodename;
 256
 257         res = p9_client_getlock_dotl(fid, &glock);
 258         if (res < 0)
 259                 return res;
 260         if (glock.type != F_UNLCK) {
 261                 fl->fl_type = glock.type;
 262                 fl->fl_start = glock.start;
 263                 if (glock.length == 0)
 264                         fl->fl_end = OFFSET_MAX;
 265                 else
 266                         fl->fl_end = glock.start + glock.length - 1;
 267                 fl->fl_pid = glock.proc_id;
 268         } else
 269                 fl->fl_type = F_UNLCK;
 270
 271         return res;
 272 }
 273
 274 /**
 275  * v9fs_file_lock_dotl - lock a file (or directory)
 276  * @filp: file to be locked
 277  * @cmd: lock command
 278  * @fl: file lock structure
 279  *
 280  */
 281
 282 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
 283 {
 284         struct inode *inode = filp->f_path.dentry->d_inode;
 285         int ret = -ENOLCK;
 286
 287         P9_DPRINTK(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", filp,
 288                                 cmd, fl, filp->f_path.dentry->d_name.name);
 289
 290         /* No mandatory locks */
 291         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 292                 goto out_err;
 293
 294         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 295                 filemap_write_and_wait(inode->i_mapping);
 296                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 297         }
 298
 299         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
 300                 ret = v9fs_file_do_lock(filp, cmd, fl);
 301         else if (IS_GETLK(cmd))
 302                 ret = v9fs_file_getlock(filp, fl);
 303         else
 304                 ret = -EINVAL;
 305 out_err:
 306         return ret;
 307 }
 308
 309 /**
 310  * v9fs_file_flock_dotl - lock a file
 311  * @filp: file to be locked
 312  * @cmd: lock command
 313  * @fl: file lock structure
 314  *
 315  */
 316
 317 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
 318         struct file_lock *fl)
 319 {
 320         struct inode *inode = filp->f_path.dentry->d_inode;
 321         int ret = -ENOLCK;
 322
 323         P9_DPRINTK(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", filp,
 324                                 cmd, fl, filp->f_path.dentry->d_name.name);
 325
 326         /* No mandatory locks */
 327         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 328                 goto out_err;
 329
 330         if (!(fl->fl_flags & FL_FLOCK))
 331                 goto out_err;
 332
 333         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 334                 filemap_write_and_wait(inode->i_mapping);
 335                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 336         }
 337         /* Convert flock to posix lock */
 338         fl->fl_owner = (fl_owner_t)filp;
 339         fl->fl_start = 0;
 340         fl->fl_end = OFFSET_MAX;
 341         fl->fl_flags |= FL_POSIX;
 342         fl->fl_flags ^= FL_FLOCK;
 343
 344         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
 345                 ret = v9fs_file_do_lock(filp, cmd, fl);
 346         else
 347                 ret = -EINVAL;
 348 out_err:
 349         return ret;
 350 }
 351
 352 /**
 353  * v9fs_fid_readn - read from a fid
 354  * @fid: fid to read
 355  * @data: data buffer to read data into
 356  * @udata: user data buffer to read data into
 357  * @count: size of buffer
 358  * @offset: offset at which to read data
 359  *
 360  */
 361 ssize_t
 362 v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
 363                u64 offset)
 364 {
 365         int n, total, size;
 366
 367         P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid,
 368                    (long long unsigned) offset, count);
 369         n = 0;
 370         total = 0;
 371         size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
 372         do {
 373                 n = p9_client_read(fid, data, udata, offset, count);
 374                 if (n <= 0)
 375                         break;
 376
 377                 if (data)
 378                         data += n;
 379                 if (udata)
 380                         udata += n;
 381
 382                 offset += n;
 383                 count -= n;
 384                 total += n;
 385         } while (count > 0 && n == size);
 386
 387         if (n < 0)
 388                 total = n;
 389
 390         return total;
 391 }
 392
 393 /**
 394  * v9fs_file_readn - read from a file
 395  * @filp: file pointer to read
 396  * @data: data buffer to read data into
 397  * @udata: user data buffer to read data into
 398  * @count: size of buffer
 399  * @offset: offset at which to read data
 400  *
 401  */
 402 ssize_t
 403 v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
 404                u64 offset)
 405 {
 406         return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
 407 }
 408
 409 /**
 410  * v9fs_file_read - read from a file
 411  * @filp: file pointer to read
 412  * @udata: user data buffer to read data into
 413  * @count: size of buffer
 414  * @offset: offset at which to read data
 415  *
 416  */
 417
 418 static ssize_t
 419 v9fs_file_read(struct file *filp, char __user *udata, size_t count,
 420                loff_t * offset)
 421 {
 422         int ret;
 423         struct p9_fid *fid;
 424         size_t size;
 425
 426         P9_DPRINTK(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
 427         fid = filp->private_data;
 428
 429         size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
 430         if (count > size)
 431                 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
 432         else
 433                 ret = p9_client_read(fid, NULL, udata, *offset, count);
 434
 435         if (ret > 0)
 436                 *offset += ret;
 437
 438         return ret;
 439 }
 440
 441 ssize_t
 442 v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
 443                          const char __user *data, size_t count,
 444                          loff_t *offset, int invalidate)
 445 {
 446         int n;
 447         loff_t i_size;
 448         size_t total = 0;
 449         struct p9_client *clnt;
 450         loff_t origin = *offset;
 451         unsigned long pg_start, pg_end;
 452
 453         P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
 454                 (int)count, (int)*offset);
 455
 456         clnt = fid->clnt;
 457         do {
 458                 n = p9_client_write(fid, NULL, data+total, origin+total, count);
 459                 if (n <= 0)
 460                         break;
 461                 count -= n;
 462                 total += n;
 463         } while (count > 0);
 464
 465         if (invalidate && (total > 0)) {
 466                 pg_start = origin >> PAGE_CACHE_SHIFT;
 467                 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
 468                 if (inode->i_mapping && inode->i_mapping->nrpages)
 469                         invalidate_inode_pages2_range(inode->i_mapping,
 470                                                       pg_start, pg_end);
 471                 *offset += total;
 472                 i_size = i_size_read(inode);
 473                 if (*offset > i_size) {
 474                         inode_add_bytes(inode, *offset - i_size);
 475                         i_size_write(inode, *offset);
 476                 }
 477         }
 478         if (n < 0)
 479                 return n;
 480
 481         return total;
 482 }
 483
 484 /**
 485  * v9fs_file_write - write to a file
 486  * @filp: file pointer to write
 487  * @data: data buffer to write data from
 488  * @count: size of buffer
 489  * @offset: offset at which to write data
 490  *
 491  */
 492 static ssize_t
 493 v9fs_file_write(struct file *filp, const char __user * data,
 494                 size_t count, loff_t *offset)
 495 {
 496         ssize_t retval = 0;
 497         loff_t origin = *offset;
 498
 499
 500         retval = generic_write_checks(filp, &origin, &count, 0);
 501         if (retval)
 502                 goto out;
 503
 504         retval = -EINVAL;
 505         if ((ssize_t) count < 0)
 506                 goto out;
 507         retval = 0;
 508         if (!count)
 509                 goto out;
 510
 511         retval = v9fs_file_write_internal(filp->f_path.dentry->d_inode,
 512                                         filp->private_data,
 513                                         data, count, &origin, 1);
 514         /* update offset on successful write */
 515         if (retval > 0)
 516                 *offset = origin;
 517 out:
 518         return retval;
 519 }
 520
 521
 522 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
 523                            int datasync)
 524 {
 525         struct p9_fid *fid;
 526         struct inode *inode = filp->f_mapping->host;
 527         struct p9_wstat wstat;
 528         int retval;
 529
 530         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 531         if (retval)
 532                 return retval;
 533
 534         mutex_lock(&inode->i_mutex);
 535         P9_DPRINTK(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 536
 537         fid = filp->private_data;
 538         v9fs_blank_wstat(&wstat);
 539
 540         retval = p9_client_wstat(fid, &wstat);
 541         mutex_unlock(&inode->i_mutex);
 542
 543         return retval;
 544 }
 545
 546 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 547                          int datasync)
 548 {
 549         struct p9_fid *fid;
 550         struct inode *inode = filp->f_mapping->host;
 551         int retval;
 552
 553         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 554         if (retval)
 555                 return retval;
 556
 557         mutex_lock(&inode->i_mutex);
 558         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_file_fsync_dotl: filp %p datasync %x\n",
 559                         filp, datasync);
 560
 561         fid = filp->private_data;
 562
 563         retval = p9_client_fsync(fid, datasync);
 564         mutex_unlock(&inode->i_mutex);
 565
 566         return retval;
 567 }
 568
 569 static int
 570 v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 571 {
 572         int retval;
 573
 574         retval = generic_file_mmap(file, vma);
 575         if (!retval)
 576                 vma->vm_ops = &v9fs_file_vm_ops;
 577
 578         return retval;
 579 }
 580
 581 static int
 582 v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 583 {
 584         struct v9fs_inode *v9inode;
 585         struct page *page = vmf->page;
 586         struct file *filp = vma->vm_file;
 587         struct inode *inode = filp->f_path.dentry->d_inode;
 588
 589
 590         P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n",
 591                    page, (unsigned long)filp->private_data);
 592
 593         v9inode = V9FS_I(inode);
 594         /* make sure the cache has finished storing the page */
 595         v9fs_fscache_wait_on_page_write(inode, page);
 596         BUG_ON(!v9inode->writeback_fid);
 597         lock_page(page);
 598         if (page->mapping != inode->i_mapping)
 599                 goto out_unlock;
 600
 601         return VM_FAULT_LOCKED;
 602 out_unlock:
 603         unlock_page(page);
 604         return VM_FAULT_NOPAGE;
 605 }
 606
 607 static ssize_t
 608 v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
 609                  loff_t *offsetp)
 610 {
 611         loff_t size, offset;
 612         struct inode *inode;
 613         struct address_space *mapping;
 614
 615         offset = *offsetp;
 616         mapping = filp->f_mapping;
 617         inode = mapping->host;
 618         if (!count)
 619                 return 0;
 620         size = i_size_read(inode);
 621         if (offset < size)
 622                 filemap_write_and_wait_range(mapping, offset,
 623                                              offset + count - 1);
 624
 625         return v9fs_file_read(filp, udata, count, offsetp);
 626 }
 627
 628 /**
 629  * v9fs_cached_file_read - read from a file
 630  * @filp: file pointer to read
 631  * @udata: user data buffer to read data into
 632  * @count: size of buffer
 633  * @offset: offset at which to read data
 634  *
 635  */
 636 static ssize_t
 637 v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
 638                       loff_t *offset)
 639 {
 640         if (filp->f_flags & O_DIRECT)
 641                 return v9fs_direct_read(filp, data, count, offset);
 642         return do_sync_read(filp, data, count, offset);
 643 }
 644
 645 static ssize_t
 646 v9fs_direct_write(struct file *filp, const char __user * data,
 647                   size_t count, loff_t *offsetp)
 648 {
 649         loff_t offset;
 650         ssize_t retval;
 651         struct inode *inode;
 652         struct address_space *mapping;
 653
 654         offset = *offsetp;
 655         mapping = filp->f_mapping;
 656         inode = mapping->host;
 657         if (!count)
 658                 return 0;
 659
 660         mutex_lock(&inode->i_mutex);
 661         retval = filemap_write_and_wait_range(mapping, offset,
 662                                               offset + count - 1);
 663         if (retval)
 664                 goto err_out;
 665         /*
 666          * After a write we want buffered reads to be sure to go to disk to get
 667          * the new data.  We invalidate clean cached page from the region we're
 668          * about to write.  We do this *before* the write so that if we fail
 669          * here we fall back to buffered write
 670          */
 671         if (mapping->nrpages) {
 672                 pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
 673                 pgoff_t pg_end   = (offset + count - 1) >> PAGE_CACHE_SHIFT;
 674
 675                 retval = invalidate_inode_pages2_range(mapping,
 676                                                         pg_start, pg_end);
 677                 /*
 678                  * If a page can not be invalidated, fall back
 679                  * to buffered write.
 680                  */
 681                 if (retval) {
 682                         if (retval == -EBUSY)
 683                                 goto buff_write;
 684                         goto err_out;
 685                 }
 686         }
 687         retval = v9fs_file_write(filp, data, count, offsetp);
 688 err_out:
 689         mutex_unlock(&inode->i_mutex);
 690         return retval;
 691
 692 buff_write:
 693         mutex_unlock(&inode->i_mutex);
 694         return do_sync_write(filp, data, count, offsetp);
 695 }
 696
 697 /**
 698  * v9fs_cached_file_write - write to a file
 699  * @filp: file pointer to write
 700  * @data: data buffer to write data from
 701  * @count: size of buffer
 702  * @offset: offset at which to write data
 703  *
 704  */
 705 static ssize_t
 706 v9fs_cached_file_write(struct file *filp, const char __user * data,
 707                        size_t count, loff_t *offset)
 708 {
 709
 710         if (filp->f_flags & O_DIRECT)
 711                 return v9fs_direct_write(filp, data, count, offset);
 712         return do_sync_write(filp, data, count, offset);
 713 }
 714
 715 static const struct vm_operations_struct v9fs_file_vm_ops = {
 716         .fault = filemap_fault,
 717         .page_mkwrite = v9fs_vm_page_mkwrite,
 718 };
 719
 720
 721 const struct file_operations v9fs_cached_file_operations = {
 722         .llseek = generic_file_llseek,
 723         .read = v9fs_cached_file_read,
 724         .write = v9fs_cached_file_write,
 725         .aio_read = generic_file_aio_read,
 726         .aio_write = generic_file_aio_write,
 727         .open = v9fs_file_open,
 728         .release = v9fs_dir_release,
 729         .lock = v9fs_file_lock,
 730         .mmap = v9fs_file_mmap,
 731         .fsync = v9fs_file_fsync,
 732 };
 733
 734 const struct file_operations v9fs_cached_file_operations_dotl = {
 735         .llseek = generic_file_llseek,
 736         .read = v9fs_cached_file_read,
 737         .write = v9fs_cached_file_write,
 738         .aio_read = generic_file_aio_read,
 739         .aio_write = generic_file_aio_write,
 740         .open = v9fs_file_open,
 741         .release = v9fs_dir_release,
 742         .lock = v9fs_file_lock_dotl,
 743         .flock = v9fs_file_flock_dotl,
 744         .mmap = v9fs_file_mmap,
 745         .fsync = v9fs_file_fsync_dotl,
 746 };
 747
 748 const struct file_operations v9fs_file_operations = {
 749         .llseek = generic_file_llseek,
 750         .read = v9fs_file_read,
 751         .write = v9fs_file_write,
 752         .open = v9fs_file_open,
 753         .release = v9fs_dir_release,
 754         .lock = v9fs_file_lock,
 755         .mmap = generic_file_readonly_mmap,
 756         .fsync = v9fs_file_fsync,
 757 };
 758
 759 const struct file_operations v9fs_file_operations_dotl = {
 760         .llseek = generic_file_llseek,
 761         .read = v9fs_file_read,
 762         .write = v9fs_file_write,
 763         .open = v9fs_file_open,
 764         .release = v9fs_dir_release,
 765         .lock = v9fs_file_lock_dotl,
 766         .flock = v9fs_file_flock_dotl,
 767         .mmap = generic_file_readonly_mmap,
 768         .fsync = v9fs_file_fsync_dotl,
 769 };