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
 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                  * p9_client_lock_dotl overwrites flock.client_id with the
 209                  * server message, free and reuse the client name
 210                  */
 211                 if (flock.client_id != fid->clnt->name) {
 212                         kfree(flock.client_id);
 213                         flock.client_id = fid->clnt->name;
 214                 }
 215         }
 216
 217         /* map 9p status to VFS status */
 218         switch (status) {
 219         case P9_LOCK_SUCCESS:
 220                 res = 0;
 221                 break;
 222         case P9_LOCK_BLOCKED:
 223                 res = -EAGAIN;
 224                 break;
 225         default:
 226                 WARN_ONCE(1, "unknown lock status code: %d\n", status);
 227                 /* fallthough */
 228         case P9_LOCK_ERROR:
 229         case P9_LOCK_GRACE:
 230                 res = -ENOLCK;
 231                 break;
 232         }
 233
 234 out_unlock:
 235         /*
 236          * incase server returned error for lock request, revert
 237          * it locally
 238          */
 239         if (res < 0 && fl->fl_type != F_UNLCK) {
 240                 fl_type = fl->fl_type;
 241                 fl->fl_type = F_UNLCK;
 242                 /* Even if this fails we want to return the remote error */
 243                 locks_lock_file_wait(filp, fl);
 244                 fl->fl_type = fl_type;
 245         }
 246         if (flock.client_id != fid->clnt->name)
 247                 kfree(flock.client_id);
 248 out:
 249         return res;
 250 }
 251
 252 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
 253 {
 254         struct p9_getlock glock;
 255         struct p9_fid *fid;
 256         int res = 0;
 257
 258         fid = filp->private_data;
 259         BUG_ON(fid == NULL);
 260
 261         posix_test_lock(filp, fl);
 262         /*
 263          * if we have a conflicting lock locally, no need to validate
 264          * with server
 265          */
 266         if (fl->fl_type != F_UNLCK)
 267                 return res;
 268
 269         /* convert posix lock to p9 tgetlock args */
 270         memset(&glock, 0, sizeof(glock));
 271         glock.type  = P9_LOCK_TYPE_UNLCK;
 272         glock.start = fl->fl_start;
 273         if (fl->fl_end == OFFSET_MAX)
 274                 glock.length = 0;
 275         else
 276                 glock.length = fl->fl_end - fl->fl_start + 1;
 277         glock.proc_id = fl->fl_pid;
 278         glock.client_id = fid->clnt->name;
 279
 280         res = p9_client_getlock_dotl(fid, &glock);
 281         if (res < 0)
 282                 goto out;
 283         /* map 9p lock type to os lock type */
 284         switch (glock.type) {
 285         case P9_LOCK_TYPE_RDLCK:
 286                 fl->fl_type = F_RDLCK;
 287                 break;
 288         case P9_LOCK_TYPE_WRLCK:
 289                 fl->fl_type = F_WRLCK;
 290                 break;
 291         case P9_LOCK_TYPE_UNLCK:
 292                 fl->fl_type = F_UNLCK;
 293                 break;
 294         }
 295         if (glock.type != P9_LOCK_TYPE_UNLCK) {
 296                 fl->fl_start = glock.start;
 297                 if (glock.length == 0)
 298                         fl->fl_end = OFFSET_MAX;
 299                 else
 300                         fl->fl_end = glock.start + glock.length - 1;
 301                 fl->fl_pid = glock.proc_id;
 302         }
 303 out:
 304         if (glock.client_id != fid->clnt->name)
 305                 kfree(glock.client_id);
 306         return res;
 307 }
 308
 309 /**
 310  * v9fs_file_lock_dotl - lock a file (or directory)
 311  * @filp: file to be locked
 312  * @cmd: lock command
 313  * @fl: file lock structure
 314  *
 315  */
 316
 317 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
 318 {
 319         struct inode *inode = file_inode(filp);
 320         int ret = -ENOLCK;
 321
 322         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 323                  filp, cmd, fl, filp);
 324
 325         /* No mandatory locks */
 326         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 327                 goto out_err;
 328
 329         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 330                 filemap_write_and_wait(inode->i_mapping);
 331                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 332         }
 333
 334         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
 335                 ret = v9fs_file_do_lock(filp, cmd, fl);
 336         else if (IS_GETLK(cmd))
 337                 ret = v9fs_file_getlock(filp, fl);
 338         else
 339                 ret = -EINVAL;
 340 out_err:
 341         return ret;
 342 }
 343
 344 /**
 345  * v9fs_file_flock_dotl - lock a file
 346  * @filp: file to be locked
 347  * @cmd: lock command
 348  * @fl: file lock structure
 349  *
 350  */
 351
 352 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
 353         struct file_lock *fl)
 354 {
 355         struct inode *inode = file_inode(filp);
 356         int ret = -ENOLCK;
 357
 358         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 359                  filp, cmd, fl, filp);
 360
 361         /* No mandatory locks */
 362         if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
 363                 goto out_err;
 364
 365         if (!(fl->fl_flags & FL_FLOCK))
 366                 goto out_err;
 367
 368         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 369                 filemap_write_and_wait(inode->i_mapping);
 370                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 371         }
 372         /* Convert flock to posix lock */
 373         fl->fl_flags |= FL_POSIX;
 374         fl->fl_flags ^= FL_FLOCK;
 375
 376         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
 377                 ret = v9fs_file_do_lock(filp, cmd, fl);
 378         else
 379                 ret = -EINVAL;
 380 out_err:
 381         return ret;
 382 }
 383
 384 /**
 385  * v9fs_file_read - read from a file
 386  * @filp: file pointer to read
 387  * @udata: user data buffer to read data into
 388  * @count: size of buffer
 389  * @offset: offset at which to read data
 390  *
 391  */
 392
 393 static ssize_t
 394 v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 395 {
 396         struct p9_fid *fid = iocb->ki_filp->private_data;
 397         int ret, err = 0;
 398
 399         p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
 400                  iov_iter_count(to), iocb->ki_pos);
 401
 402         ret = p9_client_read(fid, iocb->ki_pos, to, &err);
 403         if (!ret)
 404                 return err;
 405
 406         iocb->ki_pos += ret;
 407         return ret;
 408 }
 409
 410 /**
 411  * v9fs_file_write - write to a file
 412  * @filp: file pointer to write
 413  * @data: data buffer to write data from
 414  * @count: size of buffer
 415  * @offset: offset at which to write data
 416  *
 417  */
 418 static ssize_t
 419 v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 420 {
 421         struct file *file = iocb->ki_filp;
 422         ssize_t retval;
 423         loff_t origin;
 424         int err = 0;
 425
 426         retval = generic_write_checks(iocb, from);
 427         if (retval <= 0)
 428                 return retval;
 429
 430         origin = iocb->ki_pos;
 431         retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
 432         if (retval > 0) {
 433                 struct inode *inode = file_inode(file);
 434                 loff_t i_size;
 435                 unsigned long pg_start, pg_end;
 436                 pg_start = origin >> PAGE_SHIFT;
 437                 pg_end = (origin + retval - 1) >> PAGE_SHIFT;
 438                 if (inode->i_mapping && inode->i_mapping->nrpages)
 439                         invalidate_inode_pages2_range(inode->i_mapping,
 440                                                       pg_start, pg_end);
 441                 iocb->ki_pos += retval;
 442                 i_size = i_size_read(inode);
 443                 if (iocb->ki_pos > i_size) {
 444                         inode_add_bytes(inode, iocb->ki_pos - i_size);
 445                         i_size_write(inode, iocb->ki_pos);
 446                 }
 447                 return retval;
 448         }
 449         return err;
 450 }
 451
 452 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
 453                            int datasync)
 454 {
 455         struct p9_fid *fid;
 456         struct inode *inode = filp->f_mapping->host;
 457         struct p9_wstat wstat;
 458         int retval;
 459
 460         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 461         if (retval)
 462                 return retval;
 463
 464         inode_lock(inode);
 465         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 466
 467         fid = filp->private_data;
 468         v9fs_blank_wstat(&wstat);
 469
 470         retval = p9_client_wstat(fid, &wstat);
 471         inode_unlock(inode);
 472
 473         return retval;
 474 }
 475
 476 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
 477                          int datasync)
 478 {
 479         struct p9_fid *fid;
 480         struct inode *inode = filp->f_mapping->host;
 481         int retval;
 482
 483         retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
 484         if (retval)
 485                 return retval;
 486
 487         inode_lock(inode);
 488         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
 489
 490         fid = filp->private_data;
 491
 492         retval = p9_client_fsync(fid, datasync);
 493         inode_unlock(inode);
 494
 495         return retval;
 496 }
 497
 498 static int
 499 v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
 500 {
 501         int retval;
 502
 503
 504         retval = generic_file_mmap(filp, vma);
 505         if (!retval)
 506                 vma->vm_ops = &v9fs_file_vm_ops;
 507
 508         return retval;
 509 }
 510
 511 static int
 512 v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
 513 {
 514         int retval;
 515         struct inode *inode;
 516         struct v9fs_inode *v9inode;
 517         struct p9_fid *fid;
 518
 519         inode = file_inode(filp);
 520         v9inode = V9FS_I(inode);
 521         mutex_lock(&v9inode->v_mutex);
 522         if (!v9inode->writeback_fid &&
 523             (vma->vm_flags & VM_WRITE)) {
 524                 /*
 525                  * clone a fid and add it to writeback_fid
 526                  * we do it during mmap instead of
 527                  * page dirty time via write_begin/page_mkwrite
 528                  * because we want write after unlink usecase
 529                  * to work.
 530                  */
 531                 fid = v9fs_writeback_fid(file_dentry(filp));
 532                 if (IS_ERR(fid)) {
 533                         retval = PTR_ERR(fid);
 534                         mutex_unlock(&v9inode->v_mutex);
 535                         return retval;
 536                 }
 537                 v9inode->writeback_fid = (void *) fid;
 538         }
 539         mutex_unlock(&v9inode->v_mutex);
 540
 541         retval = generic_file_mmap(filp, vma);
 542         if (!retval)
 543                 vma->vm_ops = &v9fs_mmap_file_vm_ops;
 544
 545         return retval;
 546 }
 547
 548 static int
 549 v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 550 {
 551         struct v9fs_inode *v9inode;
 552         struct page *page = vmf->page;
 553         struct file *filp = vma->vm_file;
 554         struct inode *inode = file_inode(filp);
 555
 556
 557         p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
 558                  page, (unsigned long)filp->private_data);
 559
 560         /* Update file times before taking page lock */
 561         file_update_time(filp);
 562
 563         v9inode = V9FS_I(inode);
 564         /* make sure the cache has finished storing the page */
 565         v9fs_fscache_wait_on_page_write(inode, page);
 566         BUG_ON(!v9inode->writeback_fid);
 567         lock_page(page);
 568         if (page->mapping != inode->i_mapping)
 569                 goto out_unlock;
 570         wait_for_stable_page(page);
 571
 572         return VM_FAULT_LOCKED;
 573 out_unlock:
 574         unlock_page(page);
 575         return VM_FAULT_NOPAGE;
 576 }
 577
 578 /**
 579  * v9fs_mmap_file_read - read from a file
 580  * @filp: file pointer to read
 581  * @data: user data buffer to read data into
 582  * @count: size of buffer
 583  * @offset: offset at which to read data
 584  *
 585  */
 586 static ssize_t
 587 v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 588 {
 589         /* TODO: Check if there are dirty pages */
 590         return v9fs_file_read_iter(iocb, to);
 591 }
 592
 593 /**
 594  * v9fs_mmap_file_write - write to a file
 595  * @filp: file pointer to write
 596  * @data: data buffer to write data from
 597  * @count: size of buffer
 598  * @offset: offset at which to write data
 599  *
 600  */
 601 static ssize_t
 602 v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 603 {
 604         /*
 605          * TODO: invalidate mmaps on filp's inode between
 606          * offset and offset+count
 607          */
 608         return v9fs_file_write_iter(iocb, from);
 609 }
 610
 611 static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
 612 {
 613         struct inode *inode;
 614
 615         struct writeback_control wbc = {
 616                 .nr_to_write = LONG_MAX,
 617                 .sync_mode = WB_SYNC_ALL,
 618                 .range_start = vma->vm_pgoff * PAGE_SIZE,
 619                  /* absolute end, byte at end included */
 620                 .range_end = vma->vm_pgoff * PAGE_SIZE +
 621                         (vma->vm_end - vma->vm_start - 1),
 622         };
 623
 624
 625         p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
 626
 627         inode = file_inode(vma->vm_file);
 628
 629         if (!mapping_cap_writeback_dirty(inode->i_mapping))
 630                 wbc.nr_to_write = 0;
 631
 632         might_sleep();
 633         sync_inode(inode, &wbc);
 634 }
 635
 636
 637 static const struct vm_operations_struct v9fs_file_vm_ops = {
 638         .fault = filemap_fault,
 639         .map_pages = filemap_map_pages,
 640         .page_mkwrite = v9fs_vm_page_mkwrite,
 641 };
 642
 643 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
 644         .close = v9fs_mmap_vm_close,
 645         .fault = filemap_fault,
 646         .map_pages = filemap_map_pages,
 647         .page_mkwrite = v9fs_vm_page_mkwrite,
 648 };
 649
 650
 651 const struct file_operations v9fs_cached_file_operations = {
 652         .llseek = generic_file_llseek,
 653         .read_iter = generic_file_read_iter,
 654         .write_iter = generic_file_write_iter,
 655         .open = v9fs_file_open,
 656         .release = v9fs_dir_release,
 657         .lock = v9fs_file_lock,
 658         .mmap = v9fs_file_mmap,
 659         .fsync = v9fs_file_fsync,
 660 };
 661
 662 const struct file_operations v9fs_cached_file_operations_dotl = {
 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_dotl,
 669         .flock = v9fs_file_flock_dotl,
 670         .mmap = v9fs_file_mmap,
 671         .fsync = v9fs_file_fsync_dotl,
 672 };
 673
 674 const struct file_operations v9fs_file_operations = {
 675         .llseek = generic_file_llseek,
 676         .read_iter = v9fs_file_read_iter,
 677         .write_iter = v9fs_file_write_iter,
 678         .open = v9fs_file_open,
 679         .release = v9fs_dir_release,
 680         .lock = v9fs_file_lock,
 681         .mmap = generic_file_readonly_mmap,
 682         .fsync = v9fs_file_fsync,
 683 };
 684
 685 const struct file_operations v9fs_file_operations_dotl = {
 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_dotl,
 692         .flock = v9fs_file_flock_dotl,
 693         .mmap = generic_file_readonly_mmap,
 694         .fsync = v9fs_file_fsync_dotl,
 695 };
 696
 697 const struct file_operations v9fs_mmap_file_operations = {
 698         .llseek = generic_file_llseek,
 699         .read_iter = v9fs_mmap_file_read_iter,
 700         .write_iter = v9fs_mmap_file_write_iter,
 701         .open = v9fs_file_open,
 702         .release = v9fs_dir_release,
 703         .lock = v9fs_file_lock,
 704         .mmap = v9fs_mmap_file_mmap,
 705         .fsync = v9fs_file_fsync,
 706 };
 707
 708 const struct file_operations v9fs_mmap_file_operations_dotl = {
 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_dotl,
 715         .flock = v9fs_file_flock_dotl,
 716         .mmap = v9fs_mmap_file_mmap,
 717         .fsync = v9fs_file_fsync_dotl,
 718 };