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Linux/fs/9p/vfs_file.c

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  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 = file_write_and_wait_range(filp, 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 = file_write_and_wait_range(filp, 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 };
707 

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