aec43ba83799255caa41d69d7671234f26be1003
[releases.git] / vfs_file.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * This file contians vfs file ops for 9P2000.
4  *
5  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7  */
8
9 #include <linux/module.h>
10 #include <linux/errno.h>
11 #include <linux/fs.h>
12 #include <linux/sched.h>
13 #include <linux/file.h>
14 #include <linux/stat.h>
15 #include <linux/string.h>
16 #include <linux/inet.h>
17 #include <linux/list.h>
18 #include <linux/pagemap.h>
19 #include <linux/utsname.h>
20 #include <linux/uaccess.h>
21 #include <linux/idr.h>
22 #include <linux/uio.h>
23 #include <linux/slab.h>
24 #include <net/9p/9p.h>
25 #include <net/9p/client.h>
26
27 #include "v9fs.h"
28 #include "v9fs_vfs.h"
29 #include "fid.h"
30 #include "cache.h"
31
32 static const struct vm_operations_struct v9fs_file_vm_ops;
33 static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
34
35 /**
36  * v9fs_file_open - open a file (or directory)
37  * @inode: inode to be opened
38  * @file: file being opened
39  *
40  */
41
42 int v9fs_file_open(struct inode *inode, struct file *file)
43 {
44         int err;
45         struct v9fs_inode *v9inode;
46         struct v9fs_session_info *v9ses;
47         struct p9_fid *fid, *writeback_fid;
48         int omode;
49
50         p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
51         v9inode = V9FS_I(inode);
52         v9ses = v9fs_inode2v9ses(inode);
53         if (v9fs_proto_dotl(v9ses))
54                 omode = v9fs_open_to_dotl_flags(file->f_flags);
55         else
56                 omode = v9fs_uflags2omode(file->f_flags,
57                                         v9fs_proto_dotu(v9ses));
58         fid = file->private_data;
59         if (!fid) {
60                 fid = v9fs_fid_clone(file_dentry(file));
61                 if (IS_ERR(fid))
62                         return PTR_ERR(fid);
63
64                 err = p9_client_open(fid, omode);
65                 if (err < 0) {
66                         p9_fid_put(fid);
67                         return err;
68                 }
69                 if ((file->f_flags & O_APPEND) &&
70                         (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
71                         generic_file_llseek(file, 0, SEEK_END);
72
73                 file->private_data = fid;
74         }
75
76         mutex_lock(&v9inode->v_mutex);
77         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
78             !v9inode->writeback_fid &&
79             ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
80                 /*
81                  * clone a fid and add it to writeback_fid
82                  * we do it during open time instead of
83                  * page dirty time via write_begin/page_mkwrite
84                  * because we want write after unlink usecase
85                  * to work.
86                  */
87                 writeback_fid = v9fs_writeback_fid(file_dentry(file));
88                 if (IS_ERR(writeback_fid)) {
89                         err = PTR_ERR(writeback_fid);
90                         mutex_unlock(&v9inode->v_mutex);
91                         goto out_error;
92                 }
93                 v9inode->writeback_fid = (void *) writeback_fid;
94         }
95         mutex_unlock(&v9inode->v_mutex);
96         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
97                 fscache_use_cookie(v9fs_inode_cookie(v9inode),
98                                    file->f_mode & FMODE_WRITE);
99         v9fs_open_fid_add(inode, &fid);
100         return 0;
101 out_error:
102         p9_fid_put(file->private_data);
103         file->private_data = NULL;
104         return err;
105 }
106
107 /**
108  * v9fs_file_lock - lock a file (or directory)
109  * @filp: file to be locked
110  * @cmd: lock command
111  * @fl: file lock structure
112  *
113  * Bugs: this looks like a local only lock, we should extend into 9P
114  *       by using open exclusive
115  */
116
117 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
118 {
119         struct inode *inode = file_inode(filp);
120
121         p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
122
123         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
124                 filemap_write_and_wait(inode->i_mapping);
125                 invalidate_mapping_pages(&inode->i_data, 0, -1);
126         }
127
128         return 0;
129 }
130
131 static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
132 {
133         struct p9_flock flock;
134         struct p9_fid *fid;
135         uint8_t status = P9_LOCK_ERROR;
136         int res = 0;
137         unsigned char fl_type;
138         struct v9fs_session_info *v9ses;
139
140         fid = filp->private_data;
141         BUG_ON(fid == NULL);
142
143         BUG_ON((fl->fl_flags & FL_POSIX) != FL_POSIX);
144
145         res = locks_lock_file_wait(filp, fl);
146         if (res < 0)
147                 goto out;
148
149         /* convert posix lock to p9 tlock args */
150         memset(&flock, 0, sizeof(flock));
151         /* map the lock type */
152         switch (fl->fl_type) {
153         case F_RDLCK:
154                 flock.type = P9_LOCK_TYPE_RDLCK;
155                 break;
156         case F_WRLCK:
157                 flock.type = P9_LOCK_TYPE_WRLCK;
158                 break;
159         case F_UNLCK:
160                 flock.type = P9_LOCK_TYPE_UNLCK;
161                 break;
162         }
163         flock.start = fl->fl_start;
164         if (fl->fl_end == OFFSET_MAX)
165                 flock.length = 0;
166         else
167                 flock.length = fl->fl_end - fl->fl_start + 1;
168         flock.proc_id = fl->fl_pid;
169         flock.client_id = fid->clnt->name;
170         if (IS_SETLKW(cmd))
171                 flock.flags = P9_LOCK_FLAGS_BLOCK;
172
173         v9ses = v9fs_inode2v9ses(file_inode(filp));
174
175         /*
176          * if its a blocked request and we get P9_LOCK_BLOCKED as the status
177          * for lock request, keep on trying
178          */
179         for (;;) {
180                 res = p9_client_lock_dotl(fid, &flock, &status);
181                 if (res < 0)
182                         goto out_unlock;
183
184                 if (status != P9_LOCK_BLOCKED)
185                         break;
186                 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
187                         break;
188                 if (schedule_timeout_interruptible(v9ses->session_lock_timeout)
189                                 != 0)
190                         break;
191                 /*
192                  * p9_client_lock_dotl overwrites flock.client_id with the
193                  * server message, free and reuse the client name
194                  */
195                 if (flock.client_id != fid->clnt->name) {
196                         kfree(flock.client_id);
197                         flock.client_id = fid->clnt->name;
198                 }
199         }
200
201         /* map 9p status to VFS status */
202         switch (status) {
203         case P9_LOCK_SUCCESS:
204                 res = 0;
205                 break;
206         case P9_LOCK_BLOCKED:
207                 res = -EAGAIN;
208                 break;
209         default:
210                 WARN_ONCE(1, "unknown lock status code: %d\n", status);
211                 fallthrough;
212         case P9_LOCK_ERROR:
213         case P9_LOCK_GRACE:
214                 res = -ENOLCK;
215                 break;
216         }
217
218 out_unlock:
219         /*
220          * incase server returned error for lock request, revert
221          * it locally
222          */
223         if (res < 0 && fl->fl_type != F_UNLCK) {
224                 fl_type = fl->fl_type;
225                 fl->fl_type = F_UNLCK;
226                 /* Even if this fails we want to return the remote error */
227                 locks_lock_file_wait(filp, fl);
228                 fl->fl_type = fl_type;
229         }
230         if (flock.client_id != fid->clnt->name)
231                 kfree(flock.client_id);
232 out:
233         return res;
234 }
235
236 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
237 {
238         struct p9_getlock glock;
239         struct p9_fid *fid;
240         int res = 0;
241
242         fid = filp->private_data;
243         BUG_ON(fid == NULL);
244
245         posix_test_lock(filp, fl);
246         /*
247          * if we have a conflicting lock locally, no need to validate
248          * with server
249          */
250         if (fl->fl_type != F_UNLCK)
251                 return res;
252
253         /* convert posix lock to p9 tgetlock args */
254         memset(&glock, 0, sizeof(glock));
255         glock.type  = P9_LOCK_TYPE_UNLCK;
256         glock.start = fl->fl_start;
257         if (fl->fl_end == OFFSET_MAX)
258                 glock.length = 0;
259         else
260                 glock.length = fl->fl_end - fl->fl_start + 1;
261         glock.proc_id = fl->fl_pid;
262         glock.client_id = fid->clnt->name;
263
264         res = p9_client_getlock_dotl(fid, &glock);
265         if (res < 0)
266                 goto out;
267         /* map 9p lock type to os lock type */
268         switch (glock.type) {
269         case P9_LOCK_TYPE_RDLCK:
270                 fl->fl_type = F_RDLCK;
271                 break;
272         case P9_LOCK_TYPE_WRLCK:
273                 fl->fl_type = F_WRLCK;
274                 break;
275         case P9_LOCK_TYPE_UNLCK:
276                 fl->fl_type = F_UNLCK;
277                 break;
278         }
279         if (glock.type != P9_LOCK_TYPE_UNLCK) {
280                 fl->fl_start = glock.start;
281                 if (glock.length == 0)
282                         fl->fl_end = OFFSET_MAX;
283                 else
284                         fl->fl_end = glock.start + glock.length - 1;
285                 fl->fl_pid = -glock.proc_id;
286         }
287 out:
288         if (glock.client_id != fid->clnt->name)
289                 kfree(glock.client_id);
290         return res;
291 }
292
293 /**
294  * v9fs_file_lock_dotl - lock a file (or directory)
295  * @filp: file to be locked
296  * @cmd: lock command
297  * @fl: file lock structure
298  *
299  */
300
301 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
302 {
303         struct inode *inode = file_inode(filp);
304         int ret = -ENOLCK;
305
306         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
307                  filp, cmd, fl, filp);
308
309         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
310                 filemap_write_and_wait(inode->i_mapping);
311                 invalidate_mapping_pages(&inode->i_data, 0, -1);
312         }
313
314         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
315                 ret = v9fs_file_do_lock(filp, cmd, fl);
316         else if (IS_GETLK(cmd))
317                 ret = v9fs_file_getlock(filp, fl);
318         else
319                 ret = -EINVAL;
320         return ret;
321 }
322
323 /**
324  * v9fs_file_flock_dotl - lock a file
325  * @filp: file to be locked
326  * @cmd: lock command
327  * @fl: file lock structure
328  *
329  */
330
331 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
332         struct file_lock *fl)
333 {
334         struct inode *inode = file_inode(filp);
335         int ret = -ENOLCK;
336
337         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
338                  filp, cmd, fl, filp);
339
340         if (!(fl->fl_flags & FL_FLOCK))
341                 goto out_err;
342
343         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
344                 filemap_write_and_wait(inode->i_mapping);
345                 invalidate_mapping_pages(&inode->i_data, 0, -1);
346         }
347         /* Convert flock to posix lock */
348         fl->fl_flags |= FL_POSIX;
349         fl->fl_flags ^= FL_FLOCK;
350
351         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
352                 ret = v9fs_file_do_lock(filp, cmd, fl);
353         else
354                 ret = -EINVAL;
355 out_err:
356         return ret;
357 }
358
359 /**
360  * v9fs_file_read_iter - read from a file
361  * @iocb: The operation parameters
362  * @to: The buffer to read into
363  *
364  */
365 static ssize_t
366 v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
367 {
368         struct p9_fid *fid = iocb->ki_filp->private_data;
369         int ret, err = 0;
370
371         p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
372                  iov_iter_count(to), iocb->ki_pos);
373
374         if (iocb->ki_filp->f_flags & O_NONBLOCK)
375                 ret = p9_client_read_once(fid, iocb->ki_pos, to, &err);
376         else
377                 ret = p9_client_read(fid, iocb->ki_pos, to, &err);
378         if (!ret)
379                 return err;
380
381         iocb->ki_pos += ret;
382         return ret;
383 }
384
385 /**
386  * v9fs_file_write_iter - write to a file
387  * @iocb: The operation parameters
388  * @from: The data to write
389  *
390  */
391 static ssize_t
392 v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
393 {
394         struct file *file = iocb->ki_filp;
395         ssize_t retval;
396         loff_t origin;
397         int err = 0;
398
399         retval = generic_write_checks(iocb, from);
400         if (retval <= 0)
401                 return retval;
402
403         origin = iocb->ki_pos;
404         retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
405         if (retval > 0) {
406                 struct inode *inode = file_inode(file);
407                 loff_t i_size;
408                 unsigned long pg_start, pg_end;
409
410                 pg_start = origin >> PAGE_SHIFT;
411                 pg_end = (origin + retval - 1) >> PAGE_SHIFT;
412                 if (inode->i_mapping && inode->i_mapping->nrpages)
413                         invalidate_inode_pages2_range(inode->i_mapping,
414                                                       pg_start, pg_end);
415                 iocb->ki_pos += retval;
416                 i_size = i_size_read(inode);
417                 if (iocb->ki_pos > i_size) {
418                         inode_add_bytes(inode, iocb->ki_pos - i_size);
419                         /*
420                          * Need to serialize against i_size_write() in
421                          * v9fs_stat2inode()
422                          */
423                         v9fs_i_size_write(inode, iocb->ki_pos);
424                 }
425                 return retval;
426         }
427         return err;
428 }
429
430 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
431                            int datasync)
432 {
433         struct p9_fid *fid;
434         struct inode *inode = filp->f_mapping->host;
435         struct p9_wstat wstat;
436         int retval;
437
438         retval = file_write_and_wait_range(filp, start, end);
439         if (retval)
440                 return retval;
441
442         inode_lock(inode);
443         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
444
445         fid = filp->private_data;
446         v9fs_blank_wstat(&wstat);
447
448         retval = p9_client_wstat(fid, &wstat);
449         inode_unlock(inode);
450
451         return retval;
452 }
453
454 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
455                          int datasync)
456 {
457         struct p9_fid *fid;
458         struct inode *inode = filp->f_mapping->host;
459         int retval;
460
461         retval = file_write_and_wait_range(filp, start, end);
462         if (retval)
463                 return retval;
464
465         inode_lock(inode);
466         p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
467
468         fid = filp->private_data;
469
470         retval = p9_client_fsync(fid, datasync);
471         inode_unlock(inode);
472
473         return retval;
474 }
475
476 static int
477 v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
478 {
479         int retval;
480
481
482         retval = generic_file_mmap(filp, vma);
483         if (!retval)
484                 vma->vm_ops = &v9fs_file_vm_ops;
485
486         return retval;
487 }
488
489 static int
490 v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
491 {
492         int retval;
493         struct inode *inode;
494         struct v9fs_inode *v9inode;
495         struct p9_fid *fid;
496
497         inode = file_inode(filp);
498         v9inode = V9FS_I(inode);
499         mutex_lock(&v9inode->v_mutex);
500         if (!v9inode->writeback_fid &&
501             (vma->vm_flags & VM_SHARED) &&
502             (vma->vm_flags & VM_WRITE)) {
503                 /*
504                  * clone a fid and add it to writeback_fid
505                  * we do it during mmap instead of
506                  * page dirty time via write_begin/page_mkwrite
507                  * because we want write after unlink usecase
508                  * to work.
509                  */
510                 fid = v9fs_writeback_fid(file_dentry(filp));
511                 if (IS_ERR(fid)) {
512                         retval = PTR_ERR(fid);
513                         mutex_unlock(&v9inode->v_mutex);
514                         return retval;
515                 }
516                 v9inode->writeback_fid = (void *) fid;
517         }
518         mutex_unlock(&v9inode->v_mutex);
519
520         retval = generic_file_mmap(filp, vma);
521         if (!retval)
522                 vma->vm_ops = &v9fs_mmap_file_vm_ops;
523
524         return retval;
525 }
526
527 static vm_fault_t
528 v9fs_vm_page_mkwrite(struct vm_fault *vmf)
529 {
530         struct v9fs_inode *v9inode;
531         struct folio *folio = page_folio(vmf->page);
532         struct file *filp = vmf->vma->vm_file;
533         struct inode *inode = file_inode(filp);
534
535
536         p9_debug(P9_DEBUG_VFS, "folio %p fid %lx\n",
537                  folio, (unsigned long)filp->private_data);
538
539         v9inode = V9FS_I(inode);
540
541         /* Wait for the page to be written to the cache before we allow it to
542          * be modified.  We then assume the entire page will need writing back.
543          */
544 #ifdef CONFIG_9P_FSCACHE
545         if (folio_test_fscache(folio) &&
546             folio_wait_fscache_killable(folio) < 0)
547                 return VM_FAULT_NOPAGE;
548 #endif
549
550         /* Update file times before taking page lock */
551         file_update_time(filp);
552
553         BUG_ON(!v9inode->writeback_fid);
554         if (folio_lock_killable(folio) < 0)
555                 return VM_FAULT_RETRY;
556         if (folio_mapping(folio) != inode->i_mapping)
557                 goto out_unlock;
558         folio_wait_stable(folio);
559
560         return VM_FAULT_LOCKED;
561 out_unlock:
562         folio_unlock(folio);
563         return VM_FAULT_NOPAGE;
564 }
565
566 /**
567  * v9fs_mmap_file_read_iter - read from a file
568  * @iocb: The operation parameters
569  * @to: The buffer to read into
570  *
571  */
572 static ssize_t
573 v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
574 {
575         /* TODO: Check if there are dirty pages */
576         return v9fs_file_read_iter(iocb, to);
577 }
578
579 /**
580  * v9fs_mmap_file_write_iter - write to a file
581  * @iocb: The operation parameters
582  * @from: The data to write
583  *
584  */
585 static ssize_t
586 v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
587 {
588         /*
589          * TODO: invalidate mmaps on filp's inode between
590          * offset and offset+count
591          */
592         return v9fs_file_write_iter(iocb, from);
593 }
594
595 static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
596 {
597         struct inode *inode;
598
599         struct writeback_control wbc = {
600                 .nr_to_write = LONG_MAX,
601                 .sync_mode = WB_SYNC_ALL,
602                 .range_start = (loff_t)vma->vm_pgoff * PAGE_SIZE,
603                  /* absolute end, byte at end included */
604                 .range_end = (loff_t)vma->vm_pgoff * PAGE_SIZE +
605                         (vma->vm_end - vma->vm_start - 1),
606         };
607
608         if (!(vma->vm_flags & VM_SHARED))
609                 return;
610
611         p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
612
613         inode = file_inode(vma->vm_file);
614         filemap_fdatawrite_wbc(inode->i_mapping, &wbc);
615 }
616
617
618 static const struct vm_operations_struct v9fs_file_vm_ops = {
619         .fault = filemap_fault,
620         .map_pages = filemap_map_pages,
621         .page_mkwrite = v9fs_vm_page_mkwrite,
622 };
623
624 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
625         .close = v9fs_mmap_vm_close,
626         .fault = filemap_fault,
627         .map_pages = filemap_map_pages,
628         .page_mkwrite = v9fs_vm_page_mkwrite,
629 };
630
631
632 const struct file_operations v9fs_cached_file_operations = {
633         .llseek = generic_file_llseek,
634         .read_iter = generic_file_read_iter,
635         .write_iter = generic_file_write_iter,
636         .open = v9fs_file_open,
637         .release = v9fs_dir_release,
638         .lock = v9fs_file_lock,
639         .mmap = v9fs_file_mmap,
640         .splice_read = generic_file_splice_read,
641         .splice_write = iter_file_splice_write,
642         .fsync = v9fs_file_fsync,
643 };
644
645 const struct file_operations v9fs_cached_file_operations_dotl = {
646         .llseek = generic_file_llseek,
647         .read_iter = generic_file_read_iter,
648         .write_iter = generic_file_write_iter,
649         .open = v9fs_file_open,
650         .release = v9fs_dir_release,
651         .lock = v9fs_file_lock_dotl,
652         .flock = v9fs_file_flock_dotl,
653         .mmap = v9fs_file_mmap,
654         .splice_read = generic_file_splice_read,
655         .splice_write = iter_file_splice_write,
656         .fsync = v9fs_file_fsync_dotl,
657 };
658
659 const struct file_operations v9fs_file_operations = {
660         .llseek = generic_file_llseek,
661         .read_iter = v9fs_file_read_iter,
662         .write_iter = v9fs_file_write_iter,
663         .open = v9fs_file_open,
664         .release = v9fs_dir_release,
665         .lock = v9fs_file_lock,
666         .mmap = generic_file_readonly_mmap,
667         .splice_read = generic_file_splice_read,
668         .splice_write = iter_file_splice_write,
669         .fsync = v9fs_file_fsync,
670 };
671
672 const struct file_operations v9fs_file_operations_dotl = {
673         .llseek = generic_file_llseek,
674         .read_iter = v9fs_file_read_iter,
675         .write_iter = v9fs_file_write_iter,
676         .open = v9fs_file_open,
677         .release = v9fs_dir_release,
678         .lock = v9fs_file_lock_dotl,
679         .flock = v9fs_file_flock_dotl,
680         .mmap = generic_file_readonly_mmap,
681         .splice_read = generic_file_splice_read,
682         .splice_write = iter_file_splice_write,
683         .fsync = v9fs_file_fsync_dotl,
684 };
685
686 const struct file_operations v9fs_mmap_file_operations = {
687         .llseek = generic_file_llseek,
688         .read_iter = v9fs_mmap_file_read_iter,
689         .write_iter = v9fs_mmap_file_write_iter,
690         .open = v9fs_file_open,
691         .release = v9fs_dir_release,
692         .lock = v9fs_file_lock,
693         .mmap = v9fs_mmap_file_mmap,
694         .splice_read = generic_file_splice_read,
695         .splice_write = iter_file_splice_write,
696         .fsync = v9fs_file_fsync,
697 };
698
699 const struct file_operations v9fs_mmap_file_operations_dotl = {
700         .llseek = generic_file_llseek,
701         .read_iter = v9fs_mmap_file_read_iter,
702         .write_iter = v9fs_mmap_file_write_iter,
703         .open = v9fs_file_open,
704         .release = v9fs_dir_release,
705         .lock = v9fs_file_lock_dotl,
706         .flock = v9fs_file_flock_dotl,
707         .mmap = v9fs_mmap_file_mmap,
708         .splice_read = generic_file_splice_read,
709         .splice_write = iter_file_splice_write,
710         .fsync = v9fs_file_fsync_dotl,
711 };