fs/9p/vfs_file.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/fs/9p/vfs_file.c
   4  *
   5  * This file contians vfs file ops for 9P2000.
   6  *
   7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/fs.h>
  14 #include <linux/sched.h>
  15 #include <linux/file.h>
  16 #include <linux/stat.h>
  17 #include <linux/string.h>
  18 #include <linux/inet.h>
  19 #include <linux/list.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/utsname.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/idr.h>
  24 #include <linux/uio.h>
  25 #include <linux/slab.h>
  26 #include <net/9p/9p.h>
  27 #include <net/9p/client.h>
  28
  29 #include "v9fs.h"
  30 #include "v9fs_vfs.h"
  31 #include "fid.h"
  32 #include "cache.h"
  33
  34 static const struct vm_operations_struct v9fs_file_vm_ops;
  35 static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
  36
  37 /**
  38  * v9fs_file_open - open a file (or directory)
  39  * @inode: inode to be opened
  40  * @file: file being opened
  41  *
  42  */
  43
  44 int v9fs_file_open(struct inode *inode, struct file *file)
  45 {
  46         int err;
  47         struct v9fs_inode *v9inode;
  48         struct v9fs_session_info *v9ses;
  49         struct p9_fid *fid, *writeback_fid;
  50         int omode;
  51
  52         p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
  53         v9inode = V9FS_I(inode);
  54         v9ses = v9fs_inode2v9ses(inode);
  55         if (v9fs_proto_dotl(v9ses))
  56                 omode = v9fs_open_to_dotl_flags(file->f_flags);
  57         else
  58                 omode = v9fs_uflags2omode(file->f_flags,
  59                                         v9fs_proto_dotu(v9ses));
  60         fid = file->private_data;
  61         if (!fid) {
  62                 fid = v9fs_fid_clone(file_dentry(file));
  63                 if (IS_ERR(fid))
  64                         return PTR_ERR(fid);
  65
  66                 err = p9_client_open(fid, omode);
  67                 if (err < 0) {
  68                         p9_client_clunk(fid);
  69                         return err;
  70                 }
  71                 if ((file->f_flags & O_APPEND) &&
  72                         (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
  73                         generic_file_llseek(file, 0, SEEK_END);
  74         }
  75
  76         file->private_data = fid;
  77         mutex_lock(&v9inode->v_mutex);
  78         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
  79             !v9inode->writeback_fid &&
  80             ((file->f_flags & O_ACCMODE) != O_RDONLY)) {
  81                 /*
  82                  * clone a fid and add it to writeback_fid
  83                  * we do it during open time instead of
  84                  * page dirty time via write_begin/page_mkwrite
  85                  * because we want write after unlink usecase
  86                  * to work.
  87                  */
  88                 writeback_fid = v9fs_writeback_fid(file_dentry(file));
  89                 if (IS_ERR(writeback_fid)) {
  90                         err = PTR_ERR(writeback_fid);
  91                         mutex_unlock(&v9inode->v_mutex);
  92                         goto out_error;
  93                 }
  94                 v9inode->writeback_fid = (void *) writeback_fid;
  95         }
  96         mutex_unlock(&v9inode->v_mutex);
  97         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
  98                 v9fs_cache_inode_set_cookie(inode, file);
  99         v9fs_open_fid_add(inode, fid);
 100         return 0;
 101 out_error:
 102         p9_client_clunk(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         int res = 0;
 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 res;
 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         if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
 145                 BUG();
 146
 147         res = locks_lock_file_wait(filp, fl);
 148         if (res < 0)
 149                 goto out;
 150
 151         /* convert posix lock to p9 tlock args */
 152         memset(&flock, 0, sizeof(flock));
 153         /* map the lock type */
 154         switch (fl->fl_type) {
 155         case F_RDLCK:
 156                 flock.type = P9_LOCK_TYPE_RDLCK;
 157                 break;
 158         case F_WRLCK:
 159                 flock.type = P9_LOCK_TYPE_WRLCK;
 160                 break;
 161         case F_UNLCK:
 162                 flock.type = P9_LOCK_TYPE_UNLCK;
 163                 break;
 164         }
 165         flock.start = fl->fl_start;
 166         if (fl->fl_end == OFFSET_MAX)
 167                 flock.length = 0;
 168         else
 169                 flock.length = fl->fl_end - fl->fl_start + 1;
 170         flock.proc_id = fl->fl_pid;
 171         flock.client_id = fid->clnt->name;
 172         if (IS_SETLKW(cmd))
 173                 flock.flags = P9_LOCK_FLAGS_BLOCK;
 174
 175         v9ses = v9fs_inode2v9ses(file_inode(filp));
 176
 177         /*
 178          * if its a blocked request and we get P9_LOCK_BLOCKED as the status
 179          * for lock request, keep on trying
 180          */
 181         for (;;) {
 182                 res = p9_client_lock_dotl(fid, &flock, &status);
 183                 if (res < 0)
 184                         goto out_unlock;
 185
 186                 if (status != P9_LOCK_BLOCKED)
 187                         break;
 188                 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
 189                         break;
 190                 if (schedule_timeout_interruptible(v9ses->session_lock_timeout)
 191                                 != 0)
 192                         break;
 193                 /*
 194                  * p9_client_lock_dotl overwrites flock.client_id with the
 195                  * server message, free and reuse the client name
 196                  */
 197                 if (flock.client_id != fid->clnt->name) {
 198                         kfree(flock.client_id);
 199                         flock.client_id = fid->clnt->name;
 200                 }
 201         }
 202
 203         /* map 9p status to VFS status */
 204         switch (status) {
 205         case P9_LOCK_SUCCESS:
 206                 res = 0;
 207                 break;
 208         case P9_LOCK_BLOCKED:
 209                 res = -EAGAIN;
 210                 break;
 211         default:
 212                 WARN_ONCE(1, "unknown lock status code: %d\n", status);
 213                 fallthrough;
 214         case P9_LOCK_ERROR:
 215         case P9_LOCK_GRACE:
 216                 res = -ENOLCK;
 217                 break;
 218         }
 219
 220 out_unlock:
 221         /*
 222          * incase server returned error for lock request, revert
 223          * it locally
 224          */
 225         if (res < 0 && fl->fl_type != F_UNLCK) {
 226                 fl_type = fl->fl_type;
 227                 fl->fl_type = F_UNLCK;
 228                 /* Even if this fails we want to return the remote error */
 229                 locks_lock_file_wait(filp, fl);
 230                 fl->fl_type = fl_type;
 231         }
 232         if (flock.client_id != fid->clnt->name)
 233                 kfree(flock.client_id);
 234 out:
 235         return res;
 236 }
 237
 238 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
 239 {
 240         struct p9_getlock glock;
 241         struct p9_fid *fid;
 242         int res = 0;
 243
 244         fid = filp->private_data;
 245         BUG_ON(fid == NULL);
 246
 247         posix_test_lock(filp, fl);
 248         /*
 249          * if we have a conflicting lock locally, no need to validate
 250          * with server
 251          */
 252         if (fl->fl_type != F_UNLCK)
 253                 return res;
 254
 255         /* convert posix lock to p9 tgetlock args */
 256         memset(&glock, 0, sizeof(glock));
 257         glock.type  = P9_LOCK_TYPE_UNLCK;
 258         glock.start = fl->fl_start;
 259         if (fl->fl_end == OFFSET_MAX)
 260                 glock.length = 0;
 261         else
 262                 glock.length = fl->fl_end - fl->fl_start + 1;
 263         glock.proc_id = fl->fl_pid;
 264         glock.client_id = fid->clnt->name;
 265
 266         res = p9_client_getlock_dotl(fid, &glock);
 267         if (res < 0)
 268                 goto out;
 269         /* map 9p lock type to os lock type */
 270         switch (glock.type) {
 271         case P9_LOCK_TYPE_RDLCK:
 272                 fl->fl_type = F_RDLCK;
 273                 break;
 274         case P9_LOCK_TYPE_WRLCK:
 275                 fl->fl_type = F_WRLCK;
 276                 break;
 277         case P9_LOCK_TYPE_UNLCK:
 278                 fl->fl_type = F_UNLCK;
 279                 break;
 280         }
 281         if (glock.type != P9_LOCK_TYPE_UNLCK) {
 282                 fl->fl_start = glock.start;
 283                 if (glock.length == 0)
 284                         fl->fl_end = OFFSET_MAX;
 285                 else
 286                         fl->fl_end = glock.start + glock.length - 1;
 287                 fl->fl_pid = -glock.proc_id;
 288         }
 289 out:
 290         if (glock.client_id != fid->clnt->name)
 291                 kfree(glock.client_id);
 292         return res;
 293 }
 294
 295 /**
 296  * v9fs_file_lock_dotl - lock a file (or directory)
 297  * @filp: file to be locked
 298  * @cmd: lock command
 299  * @fl: file lock structure
 300  *
 301  */
 302
 303 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
 304 {
 305         struct inode *inode = file_inode(filp);
 306         int ret = -ENOLCK;
 307
 308         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 309                  filp, cmd, fl, filp);
 310
 311         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 312                 filemap_write_and_wait(inode->i_mapping);
 313                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 314         }
 315
 316         if (IS_SETLK(cmd) || IS_SETLKW(cmd))
 317                 ret = v9fs_file_do_lock(filp, cmd, fl);
 318         else if (IS_GETLK(cmd))
 319                 ret = v9fs_file_getlock(filp, fl);
 320         else
 321                 ret = -EINVAL;
 322         return ret;
 323 }
 324
 325 /**
 326  * v9fs_file_flock_dotl - lock a file
 327  * @filp: file to be locked
 328  * @cmd: lock command
 329  * @fl: file lock structure
 330  *
 331  */
 332
 333 static int v9fs_file_flock_dotl(struct file *filp, int cmd,
 334         struct file_lock *fl)
 335 {
 336         struct inode *inode = file_inode(filp);
 337         int ret = -ENOLCK;
 338
 339         p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
 340                  filp, cmd, fl, filp);
 341
 342         if (!(fl->fl_flags & FL_FLOCK))
 343                 goto out_err;
 344
 345         if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
 346                 filemap_write_and_wait(inode->i_mapping);
 347                 invalidate_mapping_pages(&inode->i_data, 0, -1);
 348         }
 349         /* Convert flock to posix lock */
 350         fl->fl_flags |= FL_POSIX;
 351         fl->fl_flags ^= FL_FLOCK;
 352
 353         if (IS_SETLK(cmd) | IS_SETLKW(cmd))
 354                 ret = v9fs_file_do_lock(filp, cmd, fl);
 355         else
 356                 ret = -EINVAL;
 357 out_err:
 358         return ret;
 359 }
 360
 361 /**
 362  * v9fs_file_read_iter - read from a file
 363  * @iocb: The operation parameters
 364  * @to: The buffer to read into
 365  *
 366  */
 367 static ssize_t
 368 v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 369 {
 370         struct p9_fid *fid = iocb->ki_filp->private_data;
 371         int ret, err = 0;
 372
 373         p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
 374                  iov_iter_count(to), iocb->ki_pos);
 375
 376         if (iocb->ki_filp->f_flags & O_NONBLOCK)
 377                 ret = p9_client_read_once(fid, iocb->ki_pos, to, &err);
 378         else
 379                 ret = p9_client_read(fid, iocb->ki_pos, to, &err);
 380         if (!ret)
 381                 return err;
 382
 383         iocb->ki_pos += ret;
 384         return ret;
 385 }
 386
 387 /**
 388  * v9fs_file_write_iter - write to a file
 389  * @iocb: The operation parameters
 390  * @from: The data to write
 391  *
 392  */
 393 static ssize_t
 394 v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 395 {
 396         struct file *file = iocb->ki_filp;
 397         ssize_t retval;
 398         loff_t origin;
 399         int err = 0;
 400
 401         retval = generic_write_checks(iocb, from);
 402         if (retval <= 0)
 403                 return retval;
 404
 405         origin = iocb->ki_pos;
 406         retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
 407         if (retval > 0) {
 408                 struct inode *inode = file_inode(file);
 409                 loff_t i_size;
 410                 unsigned long pg_start, pg_end;
 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 page *page = 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, "page %p fid %lx\n",
 538                  page, (unsigned long)filp->private_data);
 539
 540         /* Update file times before taking page lock */
 541         file_update_time(filp);
 542
 543         v9inode = V9FS_I(inode);
 544         /* make sure the cache has finished storing the page */
 545         v9fs_fscache_wait_on_page_write(inode, page);
 546         BUG_ON(!v9inode->writeback_fid);
 547         lock_page(page);
 548         if (page->mapping != inode->i_mapping)
 549                 goto out_unlock;
 550         wait_for_stable_page(page);
 551
 552         return VM_FAULT_LOCKED;
 553 out_unlock:
 554         unlock_page(page);
 555         return VM_FAULT_NOPAGE;
 556 }
 557
 558 /**
 559  * v9fs_mmap_file_read_iter - read from a file
 560  * @iocb: The operation parameters
 561  * @to: The buffer to read into
 562  *
 563  */
 564 static ssize_t
 565 v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
 566 {
 567         /* TODO: Check if there are dirty pages */
 568         return v9fs_file_read_iter(iocb, to);
 569 }
 570
 571 /**
 572  * v9fs_mmap_file_write_iter - write to a file
 573  * @iocb: The operation parameters
 574  * @from: The data to write
 575  *
 576  */
 577 static ssize_t
 578 v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 579 {
 580         /*
 581          * TODO: invalidate mmaps on filp's inode between
 582          * offset and offset+count
 583          */
 584         return v9fs_file_write_iter(iocb, from);
 585 }
 586
 587 static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
 588 {
 589         struct inode *inode;
 590
 591         struct writeback_control wbc = {
 592                 .nr_to_write = LONG_MAX,
 593                 .sync_mode = WB_SYNC_ALL,
 594                 .range_start = (loff_t)vma->vm_pgoff * PAGE_SIZE,
 595                  /* absolute end, byte at end included */
 596                 .range_end = (loff_t)vma->vm_pgoff * PAGE_SIZE +
 597                         (vma->vm_end - vma->vm_start - 1),
 598         };
 599
 600         if (!(vma->vm_flags & VM_SHARED))
 601                 return;
 602
 603         p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
 604
 605         inode = file_inode(vma->vm_file);
 606         filemap_fdatawrite_wbc(inode->i_mapping, &wbc);
 607 }
 608
 609
 610 static const struct vm_operations_struct v9fs_file_vm_ops = {
 611         .fault = filemap_fault,
 612         .map_pages = filemap_map_pages,
 613         .page_mkwrite = v9fs_vm_page_mkwrite,
 614 };
 615
 616 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
 617         .close = v9fs_mmap_vm_close,
 618         .fault = filemap_fault,
 619         .map_pages = filemap_map_pages,
 620         .page_mkwrite = v9fs_vm_page_mkwrite,
 621 };
 622
 623
 624 const struct file_operations v9fs_cached_file_operations = {
 625         .llseek = generic_file_llseek,
 626         .read_iter = generic_file_read_iter,
 627         .write_iter = generic_file_write_iter,
 628         .open = v9fs_file_open,
 629         .release = v9fs_dir_release,
 630         .lock = v9fs_file_lock,
 631         .mmap = v9fs_file_mmap,
 632         .splice_read = generic_file_splice_read,
 633         .splice_write = iter_file_splice_write,
 634         .fsync = v9fs_file_fsync,
 635 };
 636
 637 const struct file_operations v9fs_cached_file_operations_dotl = {
 638         .llseek = generic_file_llseek,
 639         .read_iter = generic_file_read_iter,
 640         .write_iter = generic_file_write_iter,
 641         .open = v9fs_file_open,
 642         .release = v9fs_dir_release,
 643         .lock = v9fs_file_lock_dotl,
 644         .flock = v9fs_file_flock_dotl,
 645         .mmap = v9fs_file_mmap,
 646         .splice_read = generic_file_splice_read,
 647         .splice_write = iter_file_splice_write,
 648         .fsync = v9fs_file_fsync_dotl,
 649 };
 650
 651 const struct file_operations v9fs_file_operations = {
 652         .llseek = generic_file_llseek,
 653         .read_iter = v9fs_file_read_iter,
 654         .write_iter = v9fs_file_write_iter,
 655         .open = v9fs_file_open,
 656         .release = v9fs_dir_release,
 657         .lock = v9fs_file_lock,
 658         .mmap = generic_file_readonly_mmap,
 659         .splice_read = generic_file_splice_read,
 660         .splice_write = iter_file_splice_write,
 661         .fsync = v9fs_file_fsync,
 662 };
 663
 664 const struct file_operations v9fs_file_operations_dotl = {
 665         .llseek = generic_file_llseek,
 666         .read_iter = v9fs_file_read_iter,
 667         .write_iter = v9fs_file_write_iter,
 668         .open = v9fs_file_open,
 669         .release = v9fs_dir_release,
 670         .lock = v9fs_file_lock_dotl,
 671         .flock = v9fs_file_flock_dotl,
 672         .mmap = generic_file_readonly_mmap,
 673         .splice_read = generic_file_splice_read,
 674         .splice_write = iter_file_splice_write,
 675         .fsync = v9fs_file_fsync_dotl,
 676 };
 677
 678 const struct file_operations v9fs_mmap_file_operations = {
 679         .llseek = generic_file_llseek,
 680         .read_iter = v9fs_mmap_file_read_iter,
 681         .write_iter = v9fs_mmap_file_write_iter,
 682         .open = v9fs_file_open,
 683         .release = v9fs_dir_release,
 684         .lock = v9fs_file_lock,
 685         .mmap = v9fs_mmap_file_mmap,
 686         .splice_read = generic_file_splice_read,
 687         .splice_write = iter_file_splice_write,
 688         .fsync = v9fs_file_fsync,
 689 };
 690
 691 const struct file_operations v9fs_mmap_file_operations_dotl = {
 692         .llseek = generic_file_llseek,
 693         .read_iter = v9fs_mmap_file_read_iter,
 694         .write_iter = v9fs_mmap_file_write_iter,
 695         .open = v9fs_file_open,
 696         .release = v9fs_dir_release,
 697         .lock = v9fs_file_lock_dotl,
 698         .flock = v9fs_file_flock_dotl,
 699         .mmap = v9fs_mmap_file_mmap,
 700         .splice_read = generic_file_splice_read,
 701         .splice_write = iter_file_splice_write,
 702         .fsync = v9fs_file_fsync_dotl,
 703 };