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 <linux/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
 158         fid = filp->private_data;
 159         BUG_ON(fid == NULL);
 160
 161         if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
 162                 BUG();
 163
 164         res = locks_lock_file_wait(filp, fl);
 165         if (res < 0)
 166                 goto out;
 167
 168         /* convert posix lock to p9 tlock args */
 169         memset(&flock, 0, sizeof(flock));
 170         /* map the lock type */
 171         switch (fl->fl_type) {
 172         case F_RDLCK:
 173                 flock.type = P9_LOCK_TYPE_RDLCK;
 174                 break;
 175         case F_WRLCK:
 176                 flock.type = P9_LOCK_TYPE_WRLCK;
 177                 break;
 178         case F_UNLCK:
 179                 flock.type = P9_LOCK_TYPE_UNLCK;
 180                 break;
 181         }
 182         flock.start = fl->fl_start;
 183         if (fl->fl_end == OFFSET_MAX)
 184                 flock.length = 0;
 185         else
 186                 flock.length = fl->fl_end - fl->fl_start + 1;
 187         flock.proc_id = fl->fl_pid;
 188         flock.client_id = fid->clnt->name;
 189         if (IS_SETLKW(cmd))
 190                 flock.flags = P9_LOCK_FLAGS_BLOCK;
 191
 192         /*
 193          * if its a blocked request and we get P9_LOCK_BLOCKED as the status
 194          * for lock request, keep on trying
 195          */
 196         for (;;) {
 197                 res = p9_client_lock_dotl(fid, &flock, &status);
 198                 if (res < 0)
 199                         goto out_unlock;
 200
 201                 if (status != P9_LOCK_BLOCKED)
 202                         break;
 203                 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
 204                         break;
 205                 if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
 206                         break;
 207         }
 208
 209         /* map 9p status to VFS status */
 210         switch (status) {
 211         case P9_LOCK_SUCCESS:
 212                 res = 0;
 213                 break;
 214         case P9_LOCK_BLOCKED:
 215                 res = -EAGAIN;
 216                 break;
 217         default:
 218                 WARN_ONCE(1, "unknown lock status code: %d\n", status);
 219                 /* fallthough */
 220         case P9_LOCK_ERROR:
 221         case P9_LOCK_GRACE:
 222                 res = -ENOLCK;
 223                 break;
 224         }
 225
 226 out_unlock:
 227         /*
 228          * incase server returned error for lock request, revert
 229          * it locally
 230          */
 231         if (res < 0 && fl->fl_type != F_UNLCK) {
 232                 fl_type = fl->fl_type;
 233                 fl->fl_type = F_UNLCK;
 234                 /* Even if this fails we want to return the remote error */
 235                 locks_lock_file_wait(filp, fl);
 236                 fl->fl_type = fl_type;
 237         }
 238 out:
 239         return res;
 240 }
 241
 242 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
 243 {
 244         struct p9_getlock glock;
 245         struct p9_fid *fid;
 246         int res = 0;
 247
 248         fid = filp->private_data;
 249         BUG_ON(fid == NULL);
 250
 251         posix_test_lock(filp, fl);
 252         /*
 253          * if we have a conflicting lock locally, no need to validate
 254          * with server
 255          */
 256         if (fl->fl_type != F_UNLCK)
 257                 return res;
 258
 259         /* convert posix lock to p9 tgetlock args */
 260         memset(&glock, 0, sizeof(glock));
 261         glock.type  = P9_LOCK_TYPE_UNLCK;
 262         glock.start = fl->fl_start;
 263         if (fl->fl_end == OFFSET_MAX)
 264                 glock.length = 0;
 265         else
 266                 glock.length = fl->fl_end - fl->fl_start + 1;
 267         glock.proc_id = fl->fl_pid;
 268         glock.client_id = fid->clnt->name;
 269
 270         res = p9_client_getlock_dotl(fid, &glock);
 271         if (res < 0)
 272                 return res;
 273         /* map 9p lock type to os lock type */
 274         switch (glock.type) {
 275         case P9_LOCK_TYPE_RDLCK:
 276                 fl->fl_type = F_RDLCK;
 277                 break;
 278         case P9_LOCK_TYPE_WRLCK:
 279                 fl->fl_type = F_WRLCK;
 280                 break;
 281         case P9_LOCK_TYPE_UNLCK:
 282                 fl->fl_type = F_UNLCK;
 283                 break;
 284         }
 285         if (glock.type != P9_LOCK_TYPE_UNLCK) {
 286                 fl->fl_start = glock.start;
 287                 if (glock.length == 0)
 288                         fl->fl_end = OFFSET_MAX;
 289                 else
 290                         fl->fl_end = glock.start + glock.length - 1;
 291                 fl->fl_pid = glock.proc_id;
 292         }
 293         kfree(glock.client_id);
 294         return res;
 295 }
 296
 297 /**
 298  * v9fs_file_lock_dotl - lock a file (or directory)
 299  * @filp: file to be locked
 300  * @cmd: lock command
 301  * @fl: file lock structure
 302  *
 303  */
 304
 305 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
 306 {
 307         struct inode *inode = file_inode(filp);
 308         int ret = -ENOLCK;
 309
 310         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 311                  filp, cmd, fl, filp);
 312
 313         /* No mandatory locks */
 314         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 315                 goto out_err;
 316
 317         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 318                 filemap_write_and_wait(inode->i_mapping);
 319                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 320         }
 321
 322         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
 323                 ret = v9fs_file_do_lock(filp, cmd, fl);
 324         else if (IS_GETLK(cmd))
 325                 ret = v9fs_file_getlock(filp, fl);
 326         else
 327                 ret = -EINVAL;
 328 out_err:
 329         return ret;
 330 }
 331
 332 /**
 333  * v9fs_file_flock_dotl - lock a file
 334  * @filp: file to be locked
 335  * @cmd: lock command
 336  * @fl: file lock structure
 337  *
 338  */
 339
 340 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
 341         struct file_lock *fl)
 342 {
 343         struct inode *inode = file_inode(filp);
 344         int ret = -ENOLCK;
 345
 346         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 347                  filp, cmd, fl, filp);
 348
 349         /* No mandatory locks */
 350         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 351                 goto out_err;
 352
 353         if (!(fl->fl_flags & FL_FLOCK))
 354                 goto out_err;
 355
 356         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 357                 filemap_write_and_wait(inode->i_mapping);
 358                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 359         }
 360         /* Convert flock to posix lock */
 361         fl->fl_flags |= FL_POSIX;
 362         fl->fl_flags ^= FL_FLOCK;
 363
 364         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
 365                 ret = v9fs_file_do_lock(filp, cmd, fl);
 366         else
 367                 ret = -EINVAL;
 368 out_err:
 369         return ret;
 370 }
 371
 372 /**
 373  * v9fs_file_read - read from a file
 374  * @filp: file pointer to read
 375  * @udata: user data buffer to read data into
 376  * @count: size of buffer
 377  * @offset: offset at which to read data
 378  *
 379  */
 380
 381 static ssize_t
 382 v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 383 {
 384         struct p9_fid *fid = iocb->ki_filp->private_data;
 385         int ret, err = 0;
 386
 387         p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
 388                  iov_iter_count(to), iocb->ki_pos);
 389
 390         ret = p9_client_read(fid, iocb->ki_pos, to, &err);
 391         if (!ret)
 392                 return err;
 393
 394         iocb->ki_pos += ret;
 395         return ret;
 396 }
 397
 398 /**
 399  * v9fs_file_write - write to a file
 400  * @filp: file pointer to write
 401  * @data: data buffer to write data from
 402  * @count: size of buffer
 403  * @offset: offset at which to write data
 404  *
 405  */
 406 static ssize_t
 407 v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 408 {
 409         struct file *file = iocb->ki_filp;
 410         ssize_t retval;
 411         loff_t origin;
 412         int err = 0;
 413
 414         retval = generic_write_checks(iocb, from);
 415         if (retval <= 0)
 416                 return retval;
 417
 418         origin = iocb->ki_pos;
 419         retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
 420         if (retval > 0) {
 421                 struct inode *inode = file_inode(file);
 422                 loff_t i_size;
 423                 unsigned long pg_start, pg_end;
 424                 pg_start = origin >> PAGE_SHIFT;
 425                 pg_end = (origin + retval - 1) >> PAGE_SHIFT;
 426                 if (inode->i_mapping && inode->i_mapping->nrpages)
 427                         invalidate_inode_pages2_range(inode->i_mapping,
 428                                                       pg_start, pg_end);
 429                 iocb->ki_pos += retval;
 430                 i_size = i_size_read(inode);
 431                 if (iocb->ki_pos > i_size) {
 432                         inode_add_bytes(inode, iocb->ki_pos - i_size);
 433                         i_size_write(inode, iocb->ki_pos);
 434                 }
 435                 return retval;
 436         }
 437         return err;
 438 }
 439
 440 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
 441                            int datasync)
 442 {
 443         struct p9_fid *fid;
 444         struct inode *inode = filp->f_mapping->host;
 445         struct p9_wstat wstat;
 446         int retval;
 447
 448         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 449         if (retval)
 450                 return retval;
 451
 452         inode_lock(inode);
 453         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 454
 455         fid = filp->private_data;
 456         v9fs_blank_wstat(&wstat);
 457
 458         retval = p9_client_wstat(fid, &wstat);
 459         inode_unlock(inode);
 460
 461         return retval;
 462 }
 463
 464 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 465                          int datasync)
 466 {
 467         struct p9_fid *fid;
 468         struct inode *inode = filp->f_mapping->host;
 469         int retval;
 470
 471         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 472         if (retval)
 473                 return retval;
 474
 475         inode_lock(inode);
 476         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 477
 478         fid = filp->private_data;
 479
 480         retval = p9_client_fsync(fid, datasync);
 481         inode_unlock(inode);
 482
 483         return retval;
 484 }
 485
 486 static int
 487 v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
 488 {
 489         int retval;
 490
 491
 492         retval = generic_file_mmap(filp, vma);
 493         if (!retval)
 494                 vma->vm_ops = &v9fs_file_vm_ops;
 495
 496         return retval;
 497 }
 498
 499 static int
 500 v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
 501 {
 502         int retval;
 503         struct inode *inode;
 504         struct v9fs_inode *v9inode;
 505         struct p9_fid *fid;
 506
 507         inode = file_inode(filp);
 508         v9inode = V9FS_I(inode);
 509         mutex_lock(&v9inode->v_mutex);
 510         if (!v9inode->writeback_fid &&
 511             (vma->vm_flags & VM_WRITE)) {
 512                 /*
 513                  * clone a fid and add it to writeback_fid
 514                  * we do it during mmap instead of
 515                  * page dirty time via write_begin/page_mkwrite
 516                  * because we want write after unlink usecase
 517                  * to work.
 518                  */
 519                 fid = v9fs_writeback_fid(file_dentry(filp));
 520                 if (IS_ERR(fid)) {
 521                         retval = PTR_ERR(fid);
 522                         mutex_unlock(&v9inode->v_mutex);
 523                         return retval;
 524                 }
 525                 v9inode->writeback_fid = (void *) fid;
 526         }
 527         mutex_unlock(&v9inode->v_mutex);
 528
 529         retval = generic_file_mmap(filp, vma);
 530         if (!retval)
 531                 vma->vm_ops = &v9fs_mmap_file_vm_ops;
 532
 533         return retval;
 534 }
 535
 536 static int
 537 v9fs_vm_page_mkwrite(struct vm_fault *vmf)
 538 {
 539         struct v9fs_inode *v9inode;
 540         struct page *page = vmf->page;
 541         struct file *filp = vmf->vma->vm_file;
 542         struct inode *inode = file_inode(filp);
 543
 544
 545         p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
 546                  page, (unsigned long)filp->private_data);
 547
 548         /* Update file times before taking page lock */
 549         file_update_time(filp);
 550
 551         v9inode = V9FS_I(inode);
 552         /* make sure the cache has finished storing the page */
 553         v9fs_fscache_wait_on_page_write(inode, page);
 554         BUG_ON(!v9inode->writeback_fid);
 555         lock_page(page);
 556         if (page->mapping != inode->i_mapping)
 557                 goto out_unlock;
 558         wait_for_stable_page(page);
 559
 560         return VM_FAULT_LOCKED;
 561 out_unlock:
 562         unlock_page(page);
 563         return VM_FAULT_NOPAGE;
 564 }
 565
 566 /**
 567  * v9fs_mmap_file_read - read from a file
 568  * @filp: file pointer to read
 569  * @data: user data buffer to read data into
 570  * @count: size of buffer
 571  * @offset: offset at which to read data
 572  *
 573  */
 574 static ssize_t
 575 v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 576 {
 577         /* TODO: Check if there are dirty pages */
 578         return v9fs_file_read_iter(iocb, to);
 579 }
 580
 581 /**
 582  * v9fs_mmap_file_write - write to a file
 583  * @filp: file pointer to write
 584  * @data: data buffer to write data from
 585  * @count: size of buffer
 586  * @offset: offset at which to write data
 587  *
 588  */
 589 static ssize_t
 590 v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 591 {
 592         /*
 593          * TODO: invalidate mmaps on filp's inode between
 594          * offset and offset+count
 595          */
 596         return v9fs_file_write_iter(iocb, from);
 597 }
 598
 599 static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
 600 {
 601         struct inode *inode;
 602
 603         struct writeback_control wbc = {
 604                 .nr_to_write = LONG_MAX,
 605                 .sync_mode = WB_SYNC_ALL,
 606                 .range_start = vma->vm_pgoff * PAGE_SIZE,
 607                  /* absolute end, byte at end included */
 608                 .range_end = vma->vm_pgoff * PAGE_SIZE +
 609                         (vma->vm_end - vma->vm_start - 1),
 610         };
 611
 612
 613         p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
 614
 615         inode = file_inode(vma->vm_file);
 616
 617         if (!mapping_cap_writeback_dirty(inode->i_mapping))
 618                 wbc.nr_to_write = 0;
 619
 620         might_sleep();
 621         sync_inode(inode, &wbc);
 622 }
 623
 624
 625 static const struct vm_operations_struct v9fs_file_vm_ops = {
 626         .fault = filemap_fault,
 627         .map_pages = filemap_map_pages,
 628         .page_mkwrite = v9fs_vm_page_mkwrite,
 629 };
 630
 631 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
 632         .close = v9fs_mmap_vm_close,
 633         .fault = filemap_fault,
 634         .map_pages = filemap_map_pages,
 635         .page_mkwrite = v9fs_vm_page_mkwrite,
 636 };
 637
 638
 639 const struct file_operations v9fs_cached_file_operations = {
 640         .llseek = generic_file_llseek,
 641         .read_iter = generic_file_read_iter,
 642         .write_iter = generic_file_write_iter,
 643         .open = v9fs_file_open,
 644         .release = v9fs_dir_release,
 645         .lock = v9fs_file_lock,
 646         .mmap = v9fs_file_mmap,
 647         .fsync = v9fs_file_fsync,
 648 };
 649
 650 const struct file_operations v9fs_cached_file_operations_dotl = {
 651         .llseek = generic_file_llseek,
 652         .read_iter = generic_file_read_iter,
 653         .write_iter = generic_file_write_iter,
 654         .open = v9fs_file_open,
 655         .release = v9fs_dir_release,
 656         .lock = v9fs_file_lock_dotl,
 657         .flock = v9fs_file_flock_dotl,
 658         .mmap = v9fs_file_mmap,
 659         .fsync = v9fs_file_fsync_dotl,
 660 };
 661
 662 const struct file_operations v9fs_file_operations = {
 663         .llseek = generic_file_llseek,
 664         .read_iter = v9fs_file_read_iter,
 665         .write_iter = v9fs_file_write_iter,
 666         .open = v9fs_file_open,
 667         .release = v9fs_dir_release,
 668         .lock = v9fs_file_lock,
 669         .mmap = generic_file_readonly_mmap,
 670         .fsync = v9fs_file_fsync,
 671 };
 672
 673 const struct file_operations v9fs_file_operations_dotl = {
 674         .llseek = generic_file_llseek,
 675         .read_iter = v9fs_file_read_iter,
 676         .write_iter = v9fs_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 = generic_file_readonly_mmap,
 682         .fsync = v9fs_file_fsync_dotl,
 683 };
 684
 685 const struct file_operations v9fs_mmap_file_operations = {
 686         .llseek = generic_file_llseek,
 687         .read_iter = v9fs_mmap_file_read_iter,
 688         .write_iter = v9fs_mmap_file_write_iter,
 689         .open = v9fs_file_open,
 690         .release = v9fs_dir_release,
 691         .lock = v9fs_file_lock,
 692         .mmap = v9fs_mmap_file_mmap,
 693         .fsync = v9fs_file_fsync,
 694 };
 695
 696 const struct file_operations v9fs_mmap_file_operations_dotl = {
 697         .llseek = generic_file_llseek,
 698         .read_iter = v9fs_mmap_file_read_iter,
 699         .write_iter = v9fs_mmap_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 = v9fs_mmap_file_mmap,
 705         .fsync = v9fs_file_fsync_dotl,
 706 };