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 <linux/uio.h>
  40 #include <linux/slab.h>
  41 #include <net/9p/9p.h>
  42 #include <net/9p/client.h>
  43
  44 #include "v9fs.h"
  45 #include "v9fs_vfs.h"
  46 #include "fid.h"
  47 #include "cache.h"
  48
  49 static const struct vm_operations_struct v9fs_file_vm_ops;
  50 static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
  51
  52 /**
  53  * v9fs_file_open - open a file (or directory)
  54  * @inode: inode to be opened
  55  * @file: file being opened
  56  *
  57  */
  58
  59 int v9fs_file_open(struct inode *inode, struct file *file)
  60 {
  61         int err;
  62         struct v9fs_inode *v9inode;
  63         struct v9fs_session_info *v9ses;
  64         struct p9_fid *fid;
  65         int omode;
  66
  67         p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
  68         v9inode = V9FS_I(inode);
  69         v9ses = v9fs_inode2v9ses(inode);
  70         if (v9fs_proto_dotl(v9ses))
  71                 omode = v9fs_open_to_dotl_flags(file->f_flags);
  72         else
  73                 omode = v9fs_uflags2omode(file->f_flags,
  74                                         v9fs_proto_dotu(v9ses));
  75         fid = file->private_data;
  76         if (!fid) {
  77                 fid = v9fs_fid_clone(file_dentry(file));
  78                 if (IS_ERR(fid))
  79                         return PTR_ERR(fid);
  80
  81                 err = p9_client_open(fid, omode);
  82                 if (err < 0) {
  83                         p9_client_clunk(fid);
  84                         return err;
  85                 }
  86                 if ((file->f_flags & O_APPEND) &&
  87                         (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
  88                         generic_file_llseek(file, 0, SEEK_END);
  89         }
  90
  91         file->private_data = fid;
  92         mutex_lock(&v9inode->v_mutex);
  93         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
  94             !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_dentry(file));
 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         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
 113                 v9fs_cache_inode_set_cookie(inode, file);
 114         return 0;
 115 out_error:
 116         p9_client_clunk(file->private_data);
 117         file->private_data = NULL;
 118         return err;
 119 }
 120
 121 /**
 122  * v9fs_file_lock - lock a file (or directory)
 123  * @filp: file to be locked
 124  * @cmd: lock command
 125  * @fl: file lock structure
 126  *
 127  * Bugs: this looks like a local only lock, we should extend into 9P
 128  *       by using open exclusive
 129  */
 130
 131 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
 132 {
 133         int res = 0;
 134         struct inode *inode = file_inode(filp);
 135
 136         p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
 137
 138         /* No mandatory locks */
 139         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 140                 return -ENOLCK;
 141
 142         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 143                 filemap_write_and_wait(inode->i_mapping);
 144                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 145         }
 146
 147         return res;
 148 }
 149
 150 static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
 151 {
 152         struct p9_flock flock;
 153         struct p9_fid *fid;
 154         uint8_t status = P9_LOCK_ERROR;
 155         int res = 0;
 156         unsigned char fl_type;
 157         struct v9fs_session_info *v9ses;
 158
 159         fid = filp->private_data;
 160         BUG_ON(fid == NULL);
 161
 162         if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
 163                 BUG();
 164
 165         res = locks_lock_file_wait(filp, fl);
 166         if (res < 0)
 167                 goto out;
 168
 169         /* convert posix lock to p9 tlock args */
 170         memset(&flock, 0, sizeof(flock));
 171         /* map the lock type */
 172         switch (fl->fl_type) {
 173         case F_RDLCK:
 174                 flock.type = P9_LOCK_TYPE_RDLCK;
 175                 break;
 176         case F_WRLCK:
 177                 flock.type = P9_LOCK_TYPE_WRLCK;
 178                 break;
 179         case F_UNLCK:
 180                 flock.type = P9_LOCK_TYPE_UNLCK;
 181                 break;
 182         }
 183         flock.start = fl->fl_start;
 184         if (fl->fl_end == OFFSET_MAX)
 185                 flock.length = 0;
 186         else
 187                 flock.length = fl->fl_end - fl->fl_start + 1;
 188         flock.proc_id = fl->fl_pid;
 189         flock.client_id = fid->clnt->name;
 190         if (IS_SETLKW(cmd))
 191                 flock.flags = P9_LOCK_FLAGS_BLOCK;
 192
 193         v9ses = v9fs_inode2v9ses(file_inode(filp));
 194
 195         /*
 196          * if its a blocked request and we get P9_LOCK_BLOCKED as the status
 197          * for lock request, keep on trying
 198          */
 199         for (;;) {
 200                 res = p9_client_lock_dotl(fid, &flock, &status);
 201                 if (res < 0)
 202                         goto out_unlock;
 203
 204                 if (status != P9_LOCK_BLOCKED)
 205                         break;
 206                 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
 207                         break;
 208                 if (schedule_timeout_interruptible(v9ses->session_lock_timeout)
 209                                 != 0)
 210                         break;
 211                 /*
 212                  * p9_client_lock_dotl overwrites flock.client_id with the
 213                  * server message, free and reuse the client name
 214                  */
 215                 if (flock.client_id != fid->clnt->name) {
 216                         kfree(flock.client_id);
 217                         flock.client_id = fid->clnt->name;
 218                 }
 219         }
 220
 221         /* map 9p status to VFS status */
 222         switch (status) {
 223         case P9_LOCK_SUCCESS:
 224                 res = 0;
 225                 break;
 226         case P9_LOCK_BLOCKED:
 227                 res = -EAGAIN;
 228                 break;
 229         default:
 230                 WARN_ONCE(1, "unknown lock status code: %d\n", status);
 231                 /* fallthough */
 232         case P9_LOCK_ERROR:
 233         case P9_LOCK_GRACE:
 234                 res = -ENOLCK;
 235                 break;
 236         }
 237
 238 out_unlock:
 239         /*
 240          * incase server returned error for lock request, revert
 241          * it locally
 242          */
 243         if (res < 0 && fl->fl_type != F_UNLCK) {
 244                 fl_type = fl->fl_type;
 245                 fl->fl_type = F_UNLCK;
 246                 /* Even if this fails we want to return the remote error */
 247                 locks_lock_file_wait(filp, fl);
 248                 fl->fl_type = fl_type;
 249         }
 250         if (flock.client_id != fid->clnt->name)
 251                 kfree(flock.client_id);
 252 out:
 253         return res;
 254 }
 255
 256 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
 257 {
 258         struct p9_getlock glock;
 259         struct p9_fid *fid;
 260         int res = 0;
 261
 262         fid = filp->private_data;
 263         BUG_ON(fid == NULL);
 264
 265         posix_test_lock(filp, fl);
 266         /*
 267          * if we have a conflicting lock locally, no need to validate
 268          * with server
 269          */
 270         if (fl->fl_type != F_UNLCK)
 271                 return res;
 272
 273         /* convert posix lock to p9 tgetlock args */
 274         memset(&glock, 0, sizeof(glock));
 275         glock.type  = P9_LOCK_TYPE_UNLCK;
 276         glock.start = fl->fl_start;
 277         if (fl->fl_end == OFFSET_MAX)
 278                 glock.length = 0;
 279         else
 280                 glock.length = fl->fl_end - fl->fl_start + 1;
 281         glock.proc_id = fl->fl_pid;
 282         glock.client_id = fid->clnt->name;
 283
 284         res = p9_client_getlock_dotl(fid, &glock);
 285         if (res < 0)
 286                 goto out;
 287         /* map 9p lock type to os lock type */
 288         switch (glock.type) {
 289         case P9_LOCK_TYPE_RDLCK:
 290                 fl->fl_type = F_RDLCK;
 291                 break;
 292         case P9_LOCK_TYPE_WRLCK:
 293                 fl->fl_type = F_WRLCK;
 294                 break;
 295         case P9_LOCK_TYPE_UNLCK:
 296                 fl->fl_type = F_UNLCK;
 297                 break;
 298         }
 299         if (glock.type != P9_LOCK_TYPE_UNLCK) {
 300                 fl->fl_start = glock.start;
 301                 if (glock.length == 0)
 302                         fl->fl_end = OFFSET_MAX;
 303                 else
 304                         fl->fl_end = glock.start + glock.length - 1;
 305                 fl->fl_pid = glock.proc_id;
 306         }
 307 out:
 308         if (glock.client_id != fid->clnt->name)
 309                 kfree(glock.client_id);
 310         return res;
 311 }
 312
 313 /**
 314  * v9fs_file_lock_dotl - lock a file (or directory)
 315  * @filp: file to be locked
 316  * @cmd: lock command
 317  * @fl: file lock structure
 318  *
 319  */
 320
 321 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
 322 {
 323         struct inode *inode = file_inode(filp);
 324         int ret = -ENOLCK;
 325
 326         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 327                  filp, cmd, fl, filp);
 328
 329         /* No mandatory locks */
 330         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 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
 338         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
 339                 ret = v9fs_file_do_lock(filp, cmd, fl);
 340         else if (IS_GETLK(cmd))
 341                 ret = v9fs_file_getlock(filp, fl);
 342         else
 343                 ret = -EINVAL;
 344 out_err:
 345         return ret;
 346 }
 347
 348 /**
 349  * v9fs_file_flock_dotl - lock a file
 350  * @filp: file to be locked
 351  * @cmd: lock command
 352  * @fl: file lock structure
 353  *
 354  */
 355
 356 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
 357         struct file_lock *fl)
 358 {
 359         struct inode *inode = file_inode(filp);
 360         int ret = -ENOLCK;
 361
 362         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 363                  filp, cmd, fl, filp);
 364
 365         /* No mandatory locks */
 366         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 367                 goto out_err;
 368
 369         if (!(fl->fl_flags & FL_FLOCK))
 370                 goto out_err;
 371
 372         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 373                 filemap_write_and_wait(inode->i_mapping);
 374                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 375         }
 376         /* Convert flock to posix lock */
 377         fl->fl_flags |= FL_POSIX;
 378         fl->fl_flags ^= FL_FLOCK;
 379
 380         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
 381                 ret = v9fs_file_do_lock(filp, cmd, fl);
 382         else
 383                 ret = -EINVAL;
 384 out_err:
 385         return ret;
 386 }
 387
 388 /**
 389  * v9fs_file_read - read from a file
 390  * @filp: file pointer to read
 391  * @udata: user data buffer to read data into
 392  * @count: size of buffer
 393  * @offset: offset at which to read data
 394  *
 395  */
 396
 397 static ssize_t
 398 v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 399 {
 400         struct p9_fid *fid = iocb->ki_filp->private_data;
 401         int ret, err = 0;
 402
 403         p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
 404                  iov_iter_count(to), iocb->ki_pos);
 405
 406         ret = p9_client_read(fid, iocb->ki_pos, to, &err);
 407         if (!ret)
 408                 return err;
 409
 410         iocb->ki_pos += ret;
 411         return ret;
 412 }
 413
 414 /**
 415  * v9fs_file_write - write to a file
 416  * @filp: file pointer to write
 417  * @data: data buffer to write data from
 418  * @count: size of buffer
 419  * @offset: offset at which to write data
 420  *
 421  */
 422 static ssize_t
 423 v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 424 {
 425         struct file *file = iocb->ki_filp;
 426         ssize_t retval;
 427         loff_t origin;
 428         int err = 0;
 429
 430         retval = generic_write_checks(iocb, from);
 431         if (retval <= 0)
 432                 return retval;
 433
 434         origin = iocb->ki_pos;
 435         retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
 436         if (retval > 0) {
 437                 struct inode *inode = file_inode(file);
 438                 loff_t i_size;
 439                 unsigned long pg_start, pg_end;
 440                 pg_start = origin >> PAGE_CACHE_SHIFT;
 441                 pg_end = (origin + retval - 1) >> PAGE_CACHE_SHIFT;
 442                 if (inode->i_mapping && inode->i_mapping->nrpages)
 443                         invalidate_inode_pages2_range(inode->i_mapping,
 444                                                       pg_start, pg_end);
 445                 iocb->ki_pos += retval;
 446                 i_size = i_size_read(inode);
 447                 if (iocb->ki_pos > i_size) {
 448                         inode_add_bytes(inode, iocb->ki_pos - i_size);
 449                         /*
 450                          * Need to serialize against i_size_write() in
 451                          * v9fs_stat2inode()
 452                          */
 453                         v9fs_i_size_write(inode, iocb->ki_pos);
 454                 }
 455                 return retval;
 456         }
 457         return err;
 458 }
 459
 460 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
 461                            int datasync)
 462 {
 463         struct p9_fid *fid;
 464         struct inode *inode = filp->f_mapping->host;
 465         struct p9_wstat wstat;
 466         int retval;
 467
 468         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 469         if (retval)
 470                 return retval;
 471
 472         mutex_lock(&inode->i_mutex);
 473         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 474
 475         fid = filp->private_data;
 476         v9fs_blank_wstat(&wstat);
 477
 478         retval = p9_client_wstat(fid, &wstat);
 479         mutex_unlock(&inode->i_mutex);
 480
 481         return retval;
 482 }
 483
 484 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 485                          int datasync)
 486 {
 487         struct p9_fid *fid;
 488         struct inode *inode = filp->f_mapping->host;
 489         int retval;
 490
 491         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 492         if (retval)
 493                 return retval;
 494
 495         mutex_lock(&inode->i_mutex);
 496         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 497
 498         fid = filp->private_data;
 499
 500         retval = p9_client_fsync(fid, datasync);
 501         mutex_unlock(&inode->i_mutex);
 502
 503         return retval;
 504 }
 505
 506 static int
 507 v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
 508 {
 509         int retval;
 510
 511
 512         retval = generic_file_mmap(filp, vma);
 513         if (!retval)
 514                 vma->vm_ops = &v9fs_file_vm_ops;
 515
 516         return retval;
 517 }
 518
 519 static int
 520 v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
 521 {
 522         int retval;
 523         struct inode *inode;
 524         struct v9fs_inode *v9inode;
 525         struct p9_fid *fid;
 526
 527         inode = file_inode(filp);
 528         v9inode = V9FS_I(inode);
 529         mutex_lock(&v9inode->v_mutex);
 530         if (!v9inode->writeback_fid &&
 531             (vma->vm_flags & VM_SHARED) &&
 532             (vma->vm_flags & VM_WRITE)) {
 533                 /*
 534                  * clone a fid and add it to writeback_fid
 535                  * we do it during mmap instead of
 536                  * page dirty time via write_begin/page_mkwrite
 537                  * because we want write after unlink usecase
 538                  * to work.
 539                  */
 540                 fid = v9fs_writeback_fid(file_dentry(filp));
 541                 if (IS_ERR(fid)) {
 542                         retval = PTR_ERR(fid);
 543                         mutex_unlock(&v9inode->v_mutex);
 544                         return retval;
 545                 }
 546                 v9inode->writeback_fid = (void *) fid;
 547         }
 548         mutex_unlock(&v9inode->v_mutex);
 549
 550         retval = generic_file_mmap(filp, vma);
 551         if (!retval)
 552                 vma->vm_ops = &v9fs_mmap_file_vm_ops;
 553
 554         return retval;
 555 }
 556
 557 static int
 558 v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 559 {
 560         struct v9fs_inode *v9inode;
 561         struct page *page = vmf->page;
 562         struct file *filp = vma->vm_file;
 563         struct inode *inode = file_inode(filp);
 564
 565
 566         p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
 567                  page, (unsigned long)filp->private_data);
 568
 569         /* Update file times before taking page lock */
 570         file_update_time(filp);
 571
 572         v9inode = V9FS_I(inode);
 573         /* make sure the cache has finished storing the page */
 574         v9fs_fscache_wait_on_page_write(inode, page);
 575         BUG_ON(!v9inode->writeback_fid);
 576         lock_page(page);
 577         if (page->mapping != inode->i_mapping)
 578                 goto out_unlock;
 579         wait_for_stable_page(page);
 580
 581         return VM_FAULT_LOCKED;
 582 out_unlock:
 583         unlock_page(page);
 584         return VM_FAULT_NOPAGE;
 585 }
 586
 587 /**
 588  * v9fs_mmap_file_read - read from a file
 589  * @filp: file pointer to read
 590  * @data: user data buffer to read data into
 591  * @count: size of buffer
 592  * @offset: offset at which to read data
 593  *
 594  */
 595 static ssize_t
 596 v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 597 {
 598         /* TODO: Check if there are dirty pages */
 599         return v9fs_file_read_iter(iocb, to);
 600 }
 601
 602 /**
 603  * v9fs_mmap_file_write - write to a file
 604  * @filp: file pointer to write
 605  * @data: data buffer to write data from
 606  * @count: size of buffer
 607  * @offset: offset at which to write data
 608  *
 609  */
 610 static ssize_t
 611 v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 612 {
 613         /*
 614          * TODO: invalidate mmaps on filp's inode between
 615          * offset and offset+count
 616          */
 617         return v9fs_file_write_iter(iocb, from);
 618 }
 619
 620 static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
 621 {
 622         struct inode *inode;
 623
 624         struct writeback_control wbc = {
 625                 .nr_to_write = LONG_MAX,
 626                 .sync_mode = WB_SYNC_ALL,
 627                 .range_start = vma->vm_pgoff * PAGE_SIZE,
 628                  /* absolute end, byte at end included */
 629                 .range_end = vma->vm_pgoff * PAGE_SIZE +
 630                         (vma->vm_end - vma->vm_start - 1),
 631         };
 632
 633         if (!(vma->vm_flags & VM_SHARED))
 634                 return;
 635
 636         p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
 637
 638         inode = file_inode(vma->vm_file);
 639
 640         if (!mapping_cap_writeback_dirty(inode->i_mapping))
 641                 wbc.nr_to_write = 0;
 642
 643         might_sleep();
 644         sync_inode(inode, &wbc);
 645 }
 646
 647
 648 static const struct vm_operations_struct v9fs_file_vm_ops = {
 649         .fault = filemap_fault,
 650         .map_pages = filemap_map_pages,
 651         .page_mkwrite = v9fs_vm_page_mkwrite,
 652 };
 653
 654 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
 655         .close = v9fs_mmap_vm_close,
 656         .fault = filemap_fault,
 657         .map_pages = filemap_map_pages,
 658         .page_mkwrite = v9fs_vm_page_mkwrite,
 659 };
 660
 661
 662 const struct file_operations v9fs_cached_file_operations = {
 663         .llseek = generic_file_llseek,
 664         .read_iter = generic_file_read_iter,
 665         .write_iter = generic_file_write_iter,
 666         .open = v9fs_file_open,
 667         .release = v9fs_dir_release,
 668         .lock = v9fs_file_lock,
 669         .mmap = v9fs_file_mmap,
 670         .fsync = v9fs_file_fsync,
 671 };
 672
 673 const struct file_operations v9fs_cached_file_operations_dotl = {
 674         .llseek = generic_file_llseek,
 675         .read_iter = generic_file_read_iter,
 676         .write_iter = generic_file_write_iter,
 677         .open = v9fs_file_open,
 678         .release = v9fs_dir_release,
 679         .lock = v9fs_file_lock_dotl,
 680         .flock = v9fs_file_flock_dotl,
 681         .mmap = v9fs_file_mmap,
 682         .fsync = v9fs_file_fsync_dotl,
 683 };
 684
 685 const struct file_operations v9fs_file_operations = {
 686         .llseek = generic_file_llseek,
 687         .read_iter = v9fs_file_read_iter,
 688         .write_iter = v9fs_file_write_iter,
 689         .open = v9fs_file_open,
 690         .release = v9fs_dir_release,
 691         .lock = v9fs_file_lock,
 692         .mmap = generic_file_readonly_mmap,
 693         .fsync = v9fs_file_fsync,
 694 };
 695
 696 const struct file_operations v9fs_file_operations_dotl = {
 697         .llseek = generic_file_llseek,
 698         .read_iter = v9fs_file_read_iter,
 699         .write_iter = v9fs_file_write_iter,
 700         .open = v9fs_file_open,
 701         .release = v9fs_dir_release,
 702         .lock = v9fs_file_lock_dotl,
 703         .flock = v9fs_file_flock_dotl,
 704         .mmap = generic_file_readonly_mmap,
 705         .fsync = v9fs_file_fsync_dotl,
 706 };
 707
 708 const struct file_operations v9fs_mmap_file_operations = {
 709         .llseek = generic_file_llseek,
 710         .read_iter = v9fs_mmap_file_read_iter,
 711         .write_iter = v9fs_mmap_file_write_iter,
 712         .open = v9fs_file_open,
 713         .release = v9fs_dir_release,
 714         .lock = v9fs_file_lock,
 715         .mmap = v9fs_mmap_file_mmap,
 716         .fsync = v9fs_file_fsync,
 717 };
 718
 719 const struct file_operations v9fs_mmap_file_operations_dotl = {
 720         .llseek = generic_file_llseek,
 721         .read_iter = v9fs_mmap_file_read_iter,
 722         .write_iter = v9fs_mmap_file_write_iter,
 723         .open = v9fs_file_open,
 724         .release = v9fs_dir_release,
 725         .lock = v9fs_file_lock_dotl,
 726         .flock = v9fs_file_flock_dotl,
 727         .mmap = v9fs_mmap_file_mmap,
 728         .fsync = v9fs_file_fsync_dotl,
 729 };