xref: /openbmc/linux/fs/9p/vfs_file.c (revision 3703bd54)
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/filelock.h>
13  #include <linux/sched.h>
14  #include <linux/file.h>
15  #include <linux/stat.h>
16  #include <linux/string.h>
17  #include <linux/inet.h>
18  #include <linux/list.h>
19  #include <linux/pagemap.h>
20  #include <linux/utsname.h>
21  #include <linux/uaccess.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) && !v9inode->writeback_fid &&
78  	    ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
79  		/*
80  		 * clone a fid and add it to writeback_fid
81  		 * we do it during open time instead of
82  		 * page dirty time via write_begin/page_mkwrite
83  		 * because we want write after unlink usecase
84  		 * to work.
85  		 */
86  		writeback_fid = v9fs_writeback_fid(file_dentry(file));
87  		if (IS_ERR(writeback_fid)) {
88  			err = PTR_ERR(writeback_fid);
89  			mutex_unlock(&v9inode->v_mutex);
90  			goto out_error;
91  		}
92  		v9inode->writeback_fid = (void *) writeback_fid;
93  	}
94  	mutex_unlock(&v9inode->v_mutex);
95  #ifdef CONFIG_9P_FSCACHE
96  	if (v9ses->cache == CACHE_FSCACHE)
97  		fscache_use_cookie(v9fs_inode_cookie(v9inode),
98  				   file->f_mode & FMODE_WRITE);
99  #endif
100  	v9fs_open_fid_add(inode, &fid);
101  	return 0;
102  out_error:
103  	p9_fid_put(file->private_data);
104  	file->private_data = NULL;
105  	return err;
106  }
107  
108  /**
109   * v9fs_file_lock - lock a file (or directory)
110   * @filp: file to be locked
111   * @cmd: lock command
112   * @fl: file lock structure
113   *
114   * Bugs: this looks like a local only lock, we should extend into 9P
115   *       by using open exclusive
116   */
117  
118  static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
119  {
120  	struct inode *inode = file_inode(filp);
121  
122  	p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
123  
124  	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
125  		filemap_write_and_wait(inode->i_mapping);
126  		invalidate_mapping_pages(&inode->i_data, 0, -1);
127  	}
128  
129  	return 0;
130  }
131  
132  static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
133  {
134  	struct p9_flock flock;
135  	struct p9_fid *fid;
136  	uint8_t status = P9_LOCK_ERROR;
137  	int res = 0;
138  	unsigned char fl_type;
139  	struct v9fs_session_info *v9ses;
140  
141  	fid = filp->private_data;
142  	BUG_ON(fid == NULL);
143  
144  	BUG_ON((fl->fl_flags & FL_POSIX) != FL_POSIX);
145  
146  	res = locks_lock_file_wait(filp, fl);
147  	if (res < 0)
148  		goto out;
149  
150  	/* convert posix lock to p9 tlock args */
151  	memset(&flock, 0, sizeof(flock));
152  	/* map the lock type */
153  	switch (fl->fl_type) {
154  	case F_RDLCK:
155  		flock.type = P9_LOCK_TYPE_RDLCK;
156  		break;
157  	case F_WRLCK:
158  		flock.type = P9_LOCK_TYPE_WRLCK;
159  		break;
160  	case F_UNLCK:
161  		flock.type = P9_LOCK_TYPE_UNLCK;
162  		break;
163  	}
164  	flock.start = fl->fl_start;
165  	if (fl->fl_end == OFFSET_MAX)
166  		flock.length = 0;
167  	else
168  		flock.length = fl->fl_end - fl->fl_start + 1;
169  	flock.proc_id = fl->fl_pid;
170  	flock.client_id = fid->clnt->name;
171  	if (IS_SETLKW(cmd))
172  		flock.flags = P9_LOCK_FLAGS_BLOCK;
173  
174  	v9ses = v9fs_inode2v9ses(file_inode(filp));
175  
176  	/*
177  	 * if its a blocked request and we get P9_LOCK_BLOCKED as the status
178  	 * for lock request, keep on trying
179  	 */
180  	for (;;) {
181  		res = p9_client_lock_dotl(fid, &flock, &status);
182  		if (res < 0)
183  			goto out_unlock;
184  
185  		if (status != P9_LOCK_BLOCKED)
186  			break;
187  		if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
188  			break;
189  		if (schedule_timeout_interruptible(v9ses->session_lock_timeout)
190  				!= 0)
191  			break;
192  		/*
193  		 * p9_client_lock_dotl overwrites flock.client_id with the
194  		 * server message, free and reuse the client name
195  		 */
196  		if (flock.client_id != fid->clnt->name) {
197  			kfree(flock.client_id);
198  			flock.client_id = fid->clnt->name;
199  		}
200  	}
201  
202  	/* map 9p status to VFS status */
203  	switch (status) {
204  	case P9_LOCK_SUCCESS:
205  		res = 0;
206  		break;
207  	case P9_LOCK_BLOCKED:
208  		res = -EAGAIN;
209  		break;
210  	default:
211  		WARN_ONCE(1, "unknown lock status code: %d\n", status);
212  		fallthrough;
213  	case P9_LOCK_ERROR:
214  	case P9_LOCK_GRACE:
215  		res = -ENOLCK;
216  		break;
217  	}
218  
219  out_unlock:
220  	/*
221  	 * incase server returned error for lock request, revert
222  	 * it locally
223  	 */
224  	if (res < 0 && fl->fl_type != F_UNLCK) {
225  		fl_type = fl->fl_type;
226  		fl->fl_type = F_UNLCK;
227  		/* Even if this fails we want to return the remote error */
228  		locks_lock_file_wait(filp, fl);
229  		fl->fl_type = fl_type;
230  	}
231  	if (flock.client_id != fid->clnt->name)
232  		kfree(flock.client_id);
233  out:
234  	return res;
235  }
236  
237  static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
238  {
239  	struct p9_getlock glock;
240  	struct p9_fid *fid;
241  	int res = 0;
242  
243  	fid = filp->private_data;
244  	BUG_ON(fid == NULL);
245  
246  	posix_test_lock(filp, fl);
247  	/*
248  	 * if we have a conflicting lock locally, no need to validate
249  	 * with server
250  	 */
251  	if (fl->fl_type != F_UNLCK)
252  		return res;
253  
254  	/* convert posix lock to p9 tgetlock args */
255  	memset(&glock, 0, sizeof(glock));
256  	glock.type  = P9_LOCK_TYPE_UNLCK;
257  	glock.start = fl->fl_start;
258  	if (fl->fl_end == OFFSET_MAX)
259  		glock.length = 0;
260  	else
261  		glock.length = fl->fl_end - fl->fl_start + 1;
262  	glock.proc_id = fl->fl_pid;
263  	glock.client_id = fid->clnt->name;
264  
265  	res = p9_client_getlock_dotl(fid, &glock);
266  	if (res < 0)
267  		goto out;
268  	/* map 9p lock type to os lock type */
269  	switch (glock.type) {
270  	case P9_LOCK_TYPE_RDLCK:
271  		fl->fl_type = F_RDLCK;
272  		break;
273  	case P9_LOCK_TYPE_WRLCK:
274  		fl->fl_type = F_WRLCK;
275  		break;
276  	case P9_LOCK_TYPE_UNLCK:
277  		fl->fl_type = F_UNLCK;
278  		break;
279  	}
280  	if (glock.type != P9_LOCK_TYPE_UNLCK) {
281  		fl->fl_start = glock.start;
282  		if (glock.length == 0)
283  			fl->fl_end = OFFSET_MAX;
284  		else
285  			fl->fl_end = glock.start + glock.length - 1;
286  		fl->fl_pid = -glock.proc_id;
287  	}
288  out:
289  	if (glock.client_id != fid->clnt->name)
290  		kfree(glock.client_id);
291  	return res;
292  }
293  
294  /**
295   * v9fs_file_lock_dotl - lock a file (or directory)
296   * @filp: file to be locked
297   * @cmd: lock command
298   * @fl: file lock structure
299   *
300   */
301  
302  static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
303  {
304  	struct inode *inode = file_inode(filp);
305  	int ret = -ENOLCK;
306  
307  	p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
308  		 filp, cmd, fl, filp);
309  
310  	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
311  		filemap_write_and_wait(inode->i_mapping);
312  		invalidate_mapping_pages(&inode->i_data, 0, -1);
313  	}
314  
315  	if (IS_SETLK(cmd) || IS_SETLKW(cmd))
316  		ret = v9fs_file_do_lock(filp, cmd, fl);
317  	else if (IS_GETLK(cmd))
318  		ret = v9fs_file_getlock(filp, fl);
319  	else
320  		ret = -EINVAL;
321  	return ret;
322  }
323  
324  /**
325   * v9fs_file_flock_dotl - lock a file
326   * @filp: file to be locked
327   * @cmd: lock command
328   * @fl: file lock structure
329   *
330   */
331  
332  static int v9fs_file_flock_dotl(struct file *filp, int cmd,
333  	struct file_lock *fl)
334  {
335  	struct inode *inode = file_inode(filp);
336  	int ret = -ENOLCK;
337  
338  	p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
339  		 filp, cmd, fl, filp);
340  
341  	if (!(fl->fl_flags & FL_FLOCK))
342  		goto out_err;
343  
344  	if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
345  		filemap_write_and_wait(inode->i_mapping);
346  		invalidate_mapping_pages(&inode->i_data, 0, -1);
347  	}
348  	/* Convert flock to posix lock */
349  	fl->fl_flags |= FL_POSIX;
350  	fl->fl_flags ^= FL_FLOCK;
351  
352  	if (IS_SETLK(cmd) | IS_SETLKW(cmd))
353  		ret = v9fs_file_do_lock(filp, cmd, fl);
354  	else
355  		ret = -EINVAL;
356  out_err:
357  	return ret;
358  }
359  
360  /**
361   * v9fs_file_read_iter - read from a file
362   * @iocb: The operation parameters
363   * @to: The buffer to read into
364   *
365   */
366  static ssize_t
367  v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
368  {
369  	struct p9_fid *fid = iocb->ki_filp->private_data;
370  	int ret, err = 0;
371  
372  	p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
373  		 iov_iter_count(to), iocb->ki_pos);
374  
375  	if (iocb->ki_filp->f_flags & O_NONBLOCK)
376  		ret = p9_client_read_once(fid, iocb->ki_pos, to, &err);
377  	else
378  		ret = p9_client_read(fid, iocb->ki_pos, to, &err);
379  	if (!ret)
380  		return err;
381  
382  	iocb->ki_pos += ret;
383  	return ret;
384  }
385  
386  /**
387   * v9fs_file_write_iter - write to a file
388   * @iocb: The operation parameters
389   * @from: The data to write
390   *
391   */
392  static ssize_t
393  v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
394  {
395  	struct file *file = iocb->ki_filp;
396  	ssize_t retval;
397  	loff_t origin;
398  	int err = 0;
399  
400  	retval = generic_write_checks(iocb, from);
401  	if (retval <= 0)
402  		return retval;
403  
404  	origin = iocb->ki_pos;
405  	retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
406  	if (retval > 0) {
407  		struct inode *inode = file_inode(file);
408  		loff_t i_size;
409  		unsigned long pg_start, pg_end;
410  
411  		pg_start = origin >> PAGE_SHIFT;
412  		pg_end = (origin + retval - 1) >> PAGE_SHIFT;
413  		if (inode->i_mapping && inode->i_mapping->nrpages)
414  			invalidate_inode_pages2_range(inode->i_mapping,
415  						      pg_start, pg_end);
416  		iocb->ki_pos += retval;
417  		i_size = i_size_read(inode);
418  		if (iocb->ki_pos > i_size) {
419  			inode_add_bytes(inode, iocb->ki_pos - i_size);
420  			/*
421  			 * Need to serialize against i_size_write() in
422  			 * v9fs_stat2inode()
423  			 */
424  			v9fs_i_size_write(inode, iocb->ki_pos);
425  		}
426  		return retval;
427  	}
428  	return err;
429  }
430  
431  static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
432  			   int datasync)
433  {
434  	struct p9_fid *fid;
435  	struct inode *inode = filp->f_mapping->host;
436  	struct p9_wstat wstat;
437  	int retval;
438  
439  	retval = file_write_and_wait_range(filp, start, end);
440  	if (retval)
441  		return retval;
442  
443  	inode_lock(inode);
444  	p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
445  
446  	fid = filp->private_data;
447  	v9fs_blank_wstat(&wstat);
448  
449  	retval = p9_client_wstat(fid, &wstat);
450  	inode_unlock(inode);
451  
452  	return retval;
453  }
454  
455  int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
456  			 int datasync)
457  {
458  	struct p9_fid *fid;
459  	struct inode *inode = filp->f_mapping->host;
460  	int retval;
461  
462  	retval = file_write_and_wait_range(filp, start, end);
463  	if (retval)
464  		return retval;
465  
466  	inode_lock(inode);
467  	p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
468  
469  	fid = filp->private_data;
470  
471  	retval = p9_client_fsync(fid, datasync);
472  	inode_unlock(inode);
473  
474  	return retval;
475  }
476  
477  static int
478  v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
479  {
480  	int retval;
481  
482  
483  	retval = generic_file_mmap(filp, vma);
484  	if (!retval)
485  		vma->vm_ops = &v9fs_file_vm_ops;
486  
487  	return retval;
488  }
489  
490  static int
491  v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
492  {
493  	int retval;
494  	struct inode *inode;
495  	struct v9fs_inode *v9inode;
496  	struct p9_fid *fid;
497  
498  	inode = file_inode(filp);
499  	v9inode = V9FS_I(inode);
500  	mutex_lock(&v9inode->v_mutex);
501  	if (!v9inode->writeback_fid &&
502  	    (vma->vm_flags & VM_SHARED) &&
503  	    (vma->vm_flags & VM_WRITE)) {
504  		/*
505  		 * clone a fid and add it to writeback_fid
506  		 * we do it during mmap instead of
507  		 * page dirty time via write_begin/page_mkwrite
508  		 * because we want write after unlink usecase
509  		 * to work.
510  		 */
511  		fid = v9fs_writeback_fid(file_dentry(filp));
512  		if (IS_ERR(fid)) {
513  			retval = PTR_ERR(fid);
514  			mutex_unlock(&v9inode->v_mutex);
515  			return retval;
516  		}
517  		v9inode->writeback_fid = (void *) fid;
518  	}
519  	mutex_unlock(&v9inode->v_mutex);
520  
521  	retval = generic_file_mmap(filp, vma);
522  	if (!retval)
523  		vma->vm_ops = &v9fs_mmap_file_vm_ops;
524  
525  	return retval;
526  }
527  
528  static vm_fault_t
529  v9fs_vm_page_mkwrite(struct vm_fault *vmf)
530  {
531  	struct v9fs_inode *v9inode;
532  	struct folio *folio = page_folio(vmf->page);
533  	struct file *filp = vmf->vma->vm_file;
534  	struct inode *inode = file_inode(filp);
535  
536  
537  	p9_debug(P9_DEBUG_VFS, "folio %p fid %lx\n",
538  		 folio, (unsigned long)filp->private_data);
539  
540  	v9inode = V9FS_I(inode);
541  
542  	/* Wait for the page to be written to the cache before we allow it to
543  	 * be modified.  We then assume the entire page will need writing back.
544  	 */
545  #ifdef CONFIG_9P_FSCACHE
546  	if (folio_test_fscache(folio) &&
547  	    folio_wait_fscache_killable(folio) < 0)
548  		return VM_FAULT_NOPAGE;
549  #endif
550  
551  	/* Update file times before taking page lock */
552  	file_update_time(filp);
553  
554  	BUG_ON(!v9inode->writeback_fid);
555  	if (folio_lock_killable(folio) < 0)
556  		return VM_FAULT_RETRY;
557  	if (folio_mapping(folio) != inode->i_mapping)
558  		goto out_unlock;
559  	folio_wait_stable(folio);
560  
561  	return VM_FAULT_LOCKED;
562  out_unlock:
563  	folio_unlock(folio);
564  	return VM_FAULT_NOPAGE;
565  }
566  
567  /**
568   * v9fs_mmap_file_read_iter - read from a file
569   * @iocb: The operation parameters
570   * @to: The buffer to read into
571   *
572   */
573  static ssize_t
574  v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
575  {
576  	/* TODO: Check if there are dirty pages */
577  	return v9fs_file_read_iter(iocb, to);
578  }
579  
580  /**
581   * v9fs_mmap_file_write_iter - write to a file
582   * @iocb: The operation parameters
583   * @from: The data to write
584   *
585   */
586  static ssize_t
587  v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
588  {
589  	/*
590  	 * TODO: invalidate mmaps on filp's inode between
591  	 * offset and offset+count
592  	 */
593  	return v9fs_file_write_iter(iocb, from);
594  }
595  
596  static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
597  {
598  	struct inode *inode;
599  
600  	struct writeback_control wbc = {
601  		.nr_to_write = LONG_MAX,
602  		.sync_mode = WB_SYNC_ALL,
603  		.range_start = (loff_t)vma->vm_pgoff * PAGE_SIZE,
604  		 /* absolute end, byte at end included */
605  		.range_end = (loff_t)vma->vm_pgoff * PAGE_SIZE +
606  			(vma->vm_end - vma->vm_start - 1),
607  	};
608  
609  	if (!(vma->vm_flags & VM_SHARED))
610  		return;
611  
612  	p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
613  
614  	inode = file_inode(vma->vm_file);
615  	filemap_fdatawrite_wbc(inode->i_mapping, &wbc);
616  }
617  
618  
619  static const struct vm_operations_struct v9fs_file_vm_ops = {
620  	.fault = filemap_fault,
621  	.map_pages = filemap_map_pages,
622  	.page_mkwrite = v9fs_vm_page_mkwrite,
623  };
624  
625  static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
626  	.close = v9fs_mmap_vm_close,
627  	.fault = filemap_fault,
628  	.map_pages = filemap_map_pages,
629  	.page_mkwrite = v9fs_vm_page_mkwrite,
630  };
631  
632  
633  const struct file_operations v9fs_cached_file_operations = {
634  	.llseek = generic_file_llseek,
635  	.read_iter = generic_file_read_iter,
636  	.write_iter = generic_file_write_iter,
637  	.open = v9fs_file_open,
638  	.release = v9fs_dir_release,
639  	.lock = v9fs_file_lock,
640  	.mmap = v9fs_file_mmap,
641  	.splice_read = generic_file_splice_read,
642  	.splice_write = iter_file_splice_write,
643  	.fsync = v9fs_file_fsync,
644  };
645  
646  const struct file_operations v9fs_cached_file_operations_dotl = {
647  	.llseek = generic_file_llseek,
648  	.read_iter = generic_file_read_iter,
649  	.write_iter = generic_file_write_iter,
650  	.open = v9fs_file_open,
651  	.release = v9fs_dir_release,
652  	.lock = v9fs_file_lock_dotl,
653  	.flock = v9fs_file_flock_dotl,
654  	.mmap = v9fs_file_mmap,
655  	.splice_read = generic_file_splice_read,
656  	.splice_write = iter_file_splice_write,
657  	.fsync = v9fs_file_fsync_dotl,
658  };
659  
660  const struct file_operations v9fs_file_operations = {
661  	.llseek = generic_file_llseek,
662  	.read_iter = v9fs_file_read_iter,
663  	.write_iter = v9fs_file_write_iter,
664  	.open = v9fs_file_open,
665  	.release = v9fs_dir_release,
666  	.lock = v9fs_file_lock,
667  	.mmap = generic_file_readonly_mmap,
668  	.splice_read = generic_file_splice_read,
669  	.splice_write = iter_file_splice_write,
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  	.splice_read = generic_file_splice_read,
683  	.splice_write = iter_file_splice_write,
684  	.fsync = v9fs_file_fsync_dotl,
685  };
686  
687  const struct file_operations v9fs_mmap_file_operations = {
688  	.llseek = generic_file_llseek,
689  	.read_iter = v9fs_mmap_file_read_iter,
690  	.write_iter = v9fs_mmap_file_write_iter,
691  	.open = v9fs_file_open,
692  	.release = v9fs_dir_release,
693  	.lock = v9fs_file_lock,
694  	.mmap = v9fs_mmap_file_mmap,
695  	.splice_read = generic_file_splice_read,
696  	.splice_write = iter_file_splice_write,
697  	.fsync = v9fs_file_fsync,
698  };
699  
700  const struct file_operations v9fs_mmap_file_operations_dotl = {
701  	.llseek = generic_file_llseek,
702  	.read_iter = v9fs_mmap_file_read_iter,
703  	.write_iter = v9fs_mmap_file_write_iter,
704  	.open = v9fs_file_open,
705  	.release = v9fs_dir_release,
706  	.lock = v9fs_file_lock_dotl,
707  	.flock = v9fs_file_flock_dotl,
708  	.mmap = v9fs_mmap_file_mmap,
709  	.splice_read = generic_file_splice_read,
710  	.splice_write = iter_file_splice_write,
711  	.fsync = v9fs_file_fsync_dotl,
712  };
713