kernel/file.c

   1 /*
   2   FUSE: Filesystem in Userspace
   3   Copyright (C) 2001-2005  Miklos Szeredi <miklos@szeredi.hu>
   4
   5   This program can be distributed under the terms of the GNU GPL.
   6   See the file COPYING.
   7 */
   8
   9 #include "fuse_i.h"
  10
  11 #include <linux/pagemap.h>
  12 #include <linux/slab.h>
  13 #include <linux/kernel.h>
  14
  15 #ifndef KERNEL_2_6
  16 #define PageUptodate(page) Page_Uptodate(page)
  17 #define clear_page_dirty(page)  ClearPageDirty(page)
  18 #endif
  19 static struct file_operations fuse_direct_io_file_operations;
  20
  21 int fuse_open_common(struct inode *inode, struct file *file, int isdir)
  22 {
  23         struct fuse_conn *fc = get_fuse_conn(inode);
  24         struct fuse_req *req;
  25         struct fuse_open_in inarg;
  26         struct fuse_open_out outarg;
  27         struct fuse_file *ff;
  28         int err;
  29
  30         /* VFS checks this, but only _after_ ->open() */
  31         if (file->f_flags & O_DIRECT)
  32                 return -EINVAL;
  33
  34         err = generic_file_open(inode, file);
  35         if (err)
  36                 return err;
  37
  38         /* If opening the root node, no lookup has been performed on
  39            it, so the attributes must be refreshed */
  40         if (get_node_id(inode) == FUSE_ROOT_ID) {
  41                 int err = fuse_do_getattr(inode);
  42                 if (err)
  43                         return err;
  44         }
  45
  46         req = fuse_get_request(fc);
  47         if (!req)
  48                 return -EINTR;
  49
  50         err = -ENOMEM;
  51         ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
  52         if (!ff)
  53                 goto out_put_request;
  54
  55         ff->release_req = fuse_request_alloc();
  56         if (!ff->release_req) {
  57                 kfree(ff);
  58                 goto out_put_request;
  59         }
  60
  61         memset(&inarg, 0, sizeof(inarg));
  62         inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
  63         req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
  64         req->in.h.nodeid = get_node_id(inode);
  65         req->inode = inode;
  66         req->in.numargs = 1;
  67         req->in.args[0].size = sizeof(inarg);
  68         req->in.args[0].value = &inarg;
  69         req->out.numargs = 1;
  70         req->out.args[0].size = sizeof(outarg);
  71         req->out.args[0].value = &outarg;
  72         request_send(fc, req);
  73         err = req->out.h.error;
  74         if (err) {
  75                 fuse_request_free(ff->release_req);
  76                 kfree(ff);
  77         } else {
  78                 if (!isdir && (outarg.open_flags & FOPEN_DIRECT_IO))
  79                         file->f_op = &fuse_direct_io_file_operations;
  80                 if (!(outarg.open_flags & FOPEN_KEEP_CACHE))
  81 #ifdef KERNEL_2_6
  82                         invalidate_inode_pages(inode->i_mapping);
  83 #else
  84                         invalidate_inode_pages(inode);
  85 #endif
  86                 ff->fh = outarg.fh;
  87                 file->private_data = ff;
  88         }
  89
  90  out_put_request:
  91         fuse_put_request(fc, req);
  92         return err;
  93 }
  94
  95 int fuse_release_common(struct inode *inode, struct file *file, int isdir)
  96 {
  97         struct fuse_conn *fc = get_fuse_conn(inode);
  98         struct fuse_file *ff = file->private_data;
  99         struct fuse_req *req = ff->release_req;
 100         struct fuse_release_in *inarg = &req->misc.release_in;
 101
 102         inarg->fh = ff->fh;
 103         inarg->flags = file->f_flags & ~O_EXCL;
 104         req->in.h.opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
 105         req->in.h.nodeid = get_node_id(inode);
 106         req->inode = inode;
 107         req->in.numargs = 1;
 108         req->in.args[0].size = sizeof(struct fuse_release_in);
 109         req->in.args[0].value = inarg;
 110         request_send_background(fc, req);
 111         kfree(ff);
 112
 113         /* Return value is ignored by VFS */
 114         return 0;
 115 }
 116
 117 static int fuse_open(struct inode *inode, struct file *file)
 118 {
 119         return fuse_open_common(inode, file, 0);
 120 }
 121
 122 static int fuse_release(struct inode *inode, struct file *file)
 123 {
 124         return fuse_release_common(inode, file, 0);
 125 }
 126
 127 static int fuse_flush(struct file *file)
 128 {
 129         struct inode *inode = file->f_dentry->d_inode;
 130         struct fuse_conn *fc = get_fuse_conn(inode);
 131         struct fuse_file *ff = file->private_data;
 132         struct fuse_req *req;
 133         struct fuse_flush_in inarg;
 134         int err;
 135
 136         if (fc->no_flush)
 137                 return 0;
 138
 139         req = fuse_get_request(fc);
 140         if (!req)
 141                 return -EINTR;
 142
 143         memset(&inarg, 0, sizeof(inarg));
 144         inarg.fh = ff->fh;
 145         req->in.h.opcode = FUSE_FLUSH;
 146         req->in.h.nodeid = get_node_id(inode);
 147         req->inode = inode;
 148         req->file = file;
 149         req->in.numargs = 1;
 150         req->in.args[0].size = sizeof(inarg);
 151         req->in.args[0].value = &inarg;
 152         request_send(fc, req);
 153         err = req->out.h.error;
 154         fuse_put_request(fc, req);
 155         if (err == -ENOSYS) {
 156                 fc->no_flush = 1;
 157                 err = 0;
 158         }
 159         return err;
 160 }
 161
 162 int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
 163                       int isdir)
 164 {
 165         struct inode *inode = de->d_inode;
 166         struct fuse_conn *fc = get_fuse_conn(inode);
 167         struct fuse_file *ff = file->private_data;
 168         struct fuse_req *req;
 169         struct fuse_fsync_in inarg;
 170         int err;
 171
 172         if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
 173                 return 0;
 174
 175         req = fuse_get_request(fc);
 176         if (!req)
 177                 return -EINTR;
 178
 179         memset(&inarg, 0, sizeof(inarg));
 180         inarg.fh = ff->fh;
 181         inarg.fsync_flags = datasync ? 1 : 0;
 182         req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
 183         req->in.h.nodeid = get_node_id(inode);
 184         req->inode = inode;
 185         req->file = file;
 186         req->in.numargs = 1;
 187         req->in.args[0].size = sizeof(inarg);
 188         req->in.args[0].value = &inarg;
 189         request_send(fc, req);
 190         err = req->out.h.error;
 191         fuse_put_request(fc, req);
 192         if (err == -ENOSYS) {
 193                 if (isdir)
 194                         fc->no_fsyncdir = 1;
 195                 else
 196                         fc->no_fsync = 1;
 197                 err = 0;
 198         }
 199         return err;
 200 }
 201
 202 static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
 203 {
 204         return fuse_fsync_common(file, de, datasync, 0);
 205 }
 206
 207 size_t fuse_send_read_common(struct fuse_req *req, struct file *file,
 208                              struct inode *inode, loff_t pos, size_t count,
 209                              int isdir)
 210 {
 211         struct fuse_conn *fc = get_fuse_conn(inode);
 212         struct fuse_file *ff = file->private_data;
 213         struct fuse_read_in inarg;
 214
 215         memset(&inarg, 0, sizeof(struct fuse_read_in));
 216         inarg.fh = ff->fh;
 217         inarg.offset = pos;
 218         inarg.size = count;
 219         req->in.h.opcode = isdir ? FUSE_READDIR : FUSE_READ;
 220         req->in.h.nodeid = get_node_id(inode);
 221         req->inode = inode;
 222         req->file = file;
 223         req->in.numargs = 1;
 224         req->in.args[0].size = sizeof(struct fuse_read_in);
 225         req->in.args[0].value = &inarg;
 226         req->out.argpages = 1;
 227         req->out.argvar = 1;
 228         req->out.numargs = 1;
 229         req->out.args[0].size = count;
 230         request_send(fc, req);
 231         return req->out.args[0].size;
 232 }
 233
 234 static inline size_t fuse_send_read(struct fuse_req *req, struct file *file,
 235                                     struct inode *inode, loff_t pos,
 236                                     size_t count)
 237 {
 238         return fuse_send_read_common(req, file, inode, pos, count, 0);
 239 }
 240
 241 static int fuse_readpage(struct file *file, struct page *page)
 242 {
 243         struct inode *inode = page->mapping->host;
 244         struct fuse_conn *fc = get_fuse_conn(inode);
 245         loff_t pos = (loff_t) page->index << PAGE_CACHE_SHIFT;
 246         struct fuse_req *req = fuse_get_request(fc);
 247         int err = -EINTR;
 248         if (!req)
 249                 goto out;
 250
 251         req->out.page_zeroing = 1;
 252         req->num_pages = 1;
 253         req->pages[0] = page;
 254         fuse_send_read(req, file, inode, pos, PAGE_CACHE_SIZE);
 255         err = req->out.h.error;
 256         fuse_put_request(fc, req);
 257         if (!err)
 258                 SetPageUptodate(page);
 259         fuse_invalidate_attr(inode); /* atime changed */
 260  out:
 261         unlock_page(page);
 262         return err;
 263 }
 264
 265 #ifdef KERNEL_2_6
 266 static int fuse_send_readpages(struct fuse_req *req, struct file *file,
 267                                struct inode *inode)
 268 {
 269         loff_t pos = (loff_t) req->pages[0]->index << PAGE_CACHE_SHIFT;
 270         size_t count = req->num_pages << PAGE_CACHE_SHIFT;
 271         unsigned i;
 272         req->out.page_zeroing = 1;
 273         fuse_send_read(req, file, inode, pos, count);
 274         for (i = 0; i < req->num_pages; i++) {
 275                 struct page *page = req->pages[i];
 276                 if (!req->out.h.error)
 277                         SetPageUptodate(page);
 278                 unlock_page(page);
 279         }
 280         return req->out.h.error;
 281 }
 282
 283 struct fuse_readpages_data {
 284         struct fuse_req *req;
 285         struct file *file;
 286         struct inode *inode;
 287 };
 288
 289 static int fuse_readpages_fill(void *_data, struct page *page)
 290 {
 291         struct fuse_readpages_data *data = _data;
 292         struct fuse_req *req = data->req;
 293         struct inode *inode = data->inode;
 294         struct fuse_conn *fc = get_fuse_conn(inode);
 295
 296         if (req->num_pages &&
 297             (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
 298              (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
 299              req->pages[req->num_pages - 1]->index + 1 != page->index)) {
 300                 int err = fuse_send_readpages(req, data->file, inode);
 301                 if (err) {
 302                         unlock_page(page);
 303                         return err;
 304                 }
 305                 fuse_reset_request(req);
 306         }
 307         req->pages[req->num_pages] = page;
 308         req->num_pages ++;
 309         return 0;
 310 }
 311
 312 static int fuse_readpages(struct file *file, struct address_space *mapping,
 313                           struct list_head *pages, unsigned nr_pages)
 314 {
 315         struct inode *inode = mapping->host;
 316         struct fuse_conn *fc = get_fuse_conn(inode);
 317         struct fuse_readpages_data data;
 318         int err;
 319         data.file = file;
 320         data.inode = inode;
 321         data.req = fuse_get_request(fc);
 322         if (!data.req)
 323                 return -EINTR;
 324
 325         err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
 326         if (!err && data.req->num_pages)
 327                 err = fuse_send_readpages(data.req, file, inode);
 328         fuse_put_request(fc, data.req);
 329         fuse_invalidate_attr(inode); /* atime changed */
 330         return err;
 331 }
 332 #else /* KERNEL_2_6 */
 333 #define FUSE_BLOCK_SHIFT 16
 334 #define FUSE_BLOCK_SIZE (1UL << FUSE_BLOCK_SHIFT)
 335 #define FUSE_BLOCK_MASK (~(FUSE_BLOCK_SIZE-1))
 336 #if (1UL << (FUSE_BLOCK_SHIFT - PAGE_CACHE_SHIFT)) > FUSE_MAX_PAGES_PER_REQ
 337 #error FUSE_BLOCK_SHIFT too large
 338 #endif
 339
 340 static int fuse_is_block_uptodate(struct inode *inode, unsigned start,
 341                                   unsigned end)
 342 {
 343         int index;
 344
 345         for (index = start; index < end; index++) {
 346                 struct page *page = find_get_page(inode->i_mapping, index);
 347                 if (!page)
 348                         return 0;
 349                 if (!PageUptodate(page)) {
 350                         page_cache_release(page);
 351                         return 0;
 352                 }
 353                 page_cache_release(page);
 354         }
 355         return 1;
 356 }
 357
 358 static int fuse_file_read_block(struct fuse_req *req, struct file *file,
 359                                 struct inode *inode, unsigned start,
 360                                 unsigned end)
 361 {
 362         loff_t pos;
 363         size_t count;
 364         int index;
 365         int err = -EBUSY;
 366         int i;
 367
 368         for (index = start; index < end; index++) {
 369                 struct page *page = grab_cache_page(inode->i_mapping, index);
 370                 if (!page)
 371                         goto out;
 372                 if (PageUptodate(page)) {
 373                         unlock_page(page);
 374                         page_cache_release(page);
 375                         page = NULL;
 376                 }
 377                 req->pages[req->num_pages++] = page;
 378         }
 379         pos = (loff_t) start << PAGE_CACHE_SHIFT;
 380         count = req->num_pages << PAGE_CACHE_SHIFT;
 381         fuse_send_read(req, file, inode, pos, count);
 382         err = req->out.h.error;
 383  out:
 384         for (i = 0; i < req->num_pages; i++) {
 385                 struct page *page = req->pages[i];
 386                 if (page) {
 387                         if (!err)
 388                                 SetPageUptodate(page);
 389                         unlock_page(page);
 390                         page_cache_release(page);
 391                 }
 392         }
 393         return err;
 394 }
 395
 396 static int fuse_file_bigread(struct file *file, struct inode *inode,
 397                              loff_t pos, size_t count)
 398 {
 399         struct fuse_conn *fc = get_fuse_conn(inode);
 400         unsigned starti;
 401         unsigned endi;
 402         unsigned nexti;
 403         struct fuse_req *req;
 404         loff_t size = i_size_read(inode);
 405         loff_t end = (pos + count + FUSE_BLOCK_SIZE - 1) & FUSE_BLOCK_MASK;
 406         end = min(end, size);
 407         if (end <= pos)
 408                 return 0;
 409
 410         starti = (pos & FUSE_BLOCK_MASK) >> PAGE_CACHE_SHIFT;
 411         endi = (end + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 412
 413         req = fuse_get_request(fc);
 414         if (!req)
 415                 return -EINTR;
 416
 417         for (; starti < endi; starti = nexti) {
 418                 nexti = starti + (FUSE_BLOCK_SIZE >> PAGE_CACHE_SHIFT);
 419                 nexti = min(nexti, endi);
 420                 if (!fuse_is_block_uptodate(inode, starti, nexti)) {
 421                         if (fuse_file_read_block(req, file, inode, starti, nexti))
 422                                 break;
 423
 424                         fuse_reset_request(req);
 425                 }
 426         }
 427         fuse_put_request(fc, req);
 428         return 0;
 429 }
 430 #endif /* KERNEL_2_6 */
 431
 432 static size_t fuse_send_write(struct fuse_req *req, struct file *file,
 433                               struct inode *inode, loff_t pos, size_t count)
 434 {
 435         struct fuse_conn *fc = get_fuse_conn(inode);
 436         struct fuse_file *ff = file->private_data;
 437         struct fuse_write_in inarg;
 438         struct fuse_write_out outarg;
 439
 440         memset(&inarg, 0, sizeof(struct fuse_write_in));
 441         inarg.fh = ff->fh;
 442         inarg.offset = pos;
 443         inarg.size = count;
 444         req->in.h.opcode = FUSE_WRITE;
 445         req->in.h.nodeid = get_node_id(inode);
 446         req->inode = inode;
 447         req->file = file;
 448         req->in.argpages = 1;
 449         req->in.numargs = 2;
 450         req->in.args[0].size = sizeof(struct fuse_write_in);
 451         req->in.args[0].value = &inarg;
 452         req->in.args[1].size = count;
 453         req->out.numargs = 1;
 454         req->out.args[0].size = sizeof(struct fuse_write_out);
 455         req->out.args[0].value = &outarg;
 456         request_send(fc, req);
 457         return outarg.size;
 458 }
 459
 460 static int fuse_prepare_write(struct file *file, struct page *page,
 461                               unsigned offset, unsigned to)
 462 {
 463         /* No op */
 464         return 0;
 465 }
 466
 467 static int fuse_commit_write(struct file *file, struct page *page,
 468                              unsigned offset, unsigned to)
 469 {
 470         int err;
 471         size_t nres;
 472         unsigned count = to - offset;
 473         struct inode *inode = page->mapping->host;
 474         struct fuse_conn *fc = get_fuse_conn(inode);
 475         loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + offset;
 476         struct fuse_req *req = fuse_get_request(fc);
 477         if (!req)
 478                 return -EINTR;
 479
 480         req->num_pages = 1;
 481         req->pages[0] = page;
 482         req->page_offset = offset;
 483         nres = fuse_send_write(req, file, inode, pos, count);
 484         err = req->out.h.error;
 485         fuse_put_request(fc, req);
 486         if (!err && nres != count)
 487                 err = -EIO;
 488         if (!err) {
 489                 pos += count;
 490                 if (pos > i_size_read(inode))
 491                         i_size_write(inode, pos);
 492
 493                 if (offset == 0 && to == PAGE_CACHE_SIZE) {
 494                         clear_page_dirty(page);
 495                         SetPageUptodate(page);
 496                 }
 497         }
 498         fuse_invalidate_attr(inode);
 499         return err;
 500 }
 501
 502 static void fuse_release_user_pages(struct fuse_req *req, int write)
 503 {
 504         unsigned i;
 505
 506         for (i = 0; i < req->num_pages; i++) {
 507                 struct page *page = req->pages[i];
 508                 if (write)
 509                         set_page_dirty_lock(page);
 510                 put_page(page);
 511         }
 512 }
 513
 514 static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
 515                                unsigned nbytes, int write)
 516 {
 517         unsigned long user_addr = (unsigned long) buf;
 518         unsigned offset = user_addr & ~PAGE_MASK;
 519         int npages;
 520
 521         /* This doesn't work with nfsd */
 522         if (!current->mm)
 523                 return -EPERM;
 524
 525         nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
 526         npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
 527         npages = min(npages, FUSE_MAX_PAGES_PER_REQ);
 528         down_read(&current->mm->mmap_sem);
 529         npages = get_user_pages(current, current->mm, user_addr, npages, write,
 530                                 0, req->pages, NULL);
 531         up_read(&current->mm->mmap_sem);
 532         if (npages < 0)
 533                 return npages;
 534
 535         req->num_pages = npages;
 536         req->page_offset = offset;
 537         return 0;
 538 }
 539
 540 static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
 541                               size_t count, loff_t *ppos, int write)
 542 {
 543         struct inode *inode = file->f_dentry->d_inode;
 544         struct fuse_conn *fc = get_fuse_conn(inode);
 545         size_t nmax = write ? fc->max_write : fc->max_read;
 546         loff_t pos = *ppos;
 547         ssize_t res = 0;
 548         struct fuse_req *req = fuse_get_request(fc);
 549         if (!req)
 550                 return -EINTR;
 551
 552         while (count) {
 553                 size_t tmp;
 554                 size_t nres;
 555                 size_t nbytes = min(count, nmax);
 556                 int err = fuse_get_user_pages(req, buf, nbytes, !write);
 557                 if (err) {
 558                         res = err;
 559                         break;
 560                 }
 561                 tmp = (req->num_pages << PAGE_SHIFT) - req->page_offset;
 562                 nbytes = min(nbytes, tmp);
 563                 if (write)
 564                         nres = fuse_send_write(req, file, inode, pos, nbytes);
 565                 else
 566                         nres = fuse_send_read(req, file, inode, pos, nbytes);
 567                 fuse_release_user_pages(req, !write);
 568                 if (req->out.h.error) {
 569                         if (!res)
 570                                 res = req->out.h.error;
 571                         break;
 572                 } else if (nres > nbytes) {
 573                         res = -EIO;
 574                         break;
 575                 }
 576                 count -= nres;
 577                 res += nres;
 578                 pos += nres;
 579                 buf += nres;
 580                 if (nres != nbytes)
 581                         break;
 582                 if (count)
 583                         fuse_reset_request(req);
 584         }
 585         fuse_put_request(fc, req);
 586         if (res > 0) {
 587                 if (write && pos > i_size_read(inode))
 588                         i_size_write(inode, pos);
 589                 *ppos = pos;
 590         }
 591         fuse_invalidate_attr(inode);
 592
 593         return res;
 594 }
 595
 596 static ssize_t fuse_direct_read(struct file *file, char __user *buf,
 597                                      size_t count, loff_t *ppos)
 598 {
 599         return fuse_direct_io(file, buf, count, ppos, 0);
 600 }
 601
 602 static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
 603                                  size_t count, loff_t *ppos)
 604 {
 605         struct inode *inode = file->f_dentry->d_inode;
 606         ssize_t res;
 607         /* Don't allow parallel writes to the same file */
 608         down(&inode->i_sem);
 609         res = fuse_direct_io(file, buf, count, ppos, 1);
 610         up(&inode->i_sem);
 611         return res;
 612 }
 613
 614 #ifndef KERNEL_2_6
 615 static ssize_t fuse_file_read(struct file *file, char __user *buf,
 616                               size_t count, loff_t *ppos)
 617 {
 618         struct inode *inode = file->f_dentry->d_inode;
 619         struct fuse_conn *fc = get_fuse_conn(inode);
 620
 621         if (fc->flags & FUSE_LARGE_READ) {
 622                 int res;
 623                 down(&inode->i_sem);
 624                 res = fuse_file_bigread(file, inode, *ppos, count);
 625                 up(&inode->i_sem);
 626                 if (res)
 627                         return res;
 628         }
 629         return generic_file_read(file, buf, count, ppos);
 630 }
 631 #endif
 632 static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
 633 {
 634         if ((vma->vm_flags & VM_SHARED)) {
 635                 if ((vma->vm_flags & VM_WRITE))
 636                         return -ENODEV;
 637                 else
 638                         vma->vm_flags &= ~VM_MAYWRITE;
 639         }
 640         return generic_file_mmap(file, vma);
 641 }
 642
 643 #ifdef KERNEL_2_6
 644 static int fuse_set_page_dirty(struct page *page)
 645 {
 646         printk("fuse_set_page_dirty: should not happen\n");
 647         dump_stack();
 648         return 0;
 649 }
 650 #endif
 651
 652 static struct file_operations fuse_file_operations = {
 653         .llseek         = generic_file_llseek,
 654 #ifdef KERNEL_2_6
 655         .read           = generic_file_read,
 656 #else
 657         .read           = fuse_file_read,
 658 #endif
 659         .write          = generic_file_write,
 660         .mmap           = fuse_file_mmap,
 661         .open           = fuse_open,
 662         .flush          = fuse_flush,
 663         .release        = fuse_release,
 664         .fsync          = fuse_fsync,
 665 #ifdef KERNEL_2_6
 666         .sendfile       = generic_file_sendfile,
 667 #endif
 668 };
 669
 670 static struct file_operations fuse_direct_io_file_operations = {
 671         .llseek         = generic_file_llseek,
 672         .read           = fuse_direct_read,
 673         .write          = fuse_direct_write,
 674         .open           = fuse_open,
 675         .flush          = fuse_flush,
 676         .release        = fuse_release,
 677         .fsync          = fuse_fsync,
 678         /* no mmap and sendfile */
 679 };
 680
 681 static struct address_space_operations fuse_file_aops  = {
 682         .readpage       = fuse_readpage,
 683         .prepare_write  = fuse_prepare_write,
 684         .commit_write   = fuse_commit_write,
 685 #ifdef KERNEL_2_6
 686         .readpages      = fuse_readpages,
 687         .set_page_dirty = fuse_set_page_dirty,
 688 #endif
 689 };
 690
 691 void fuse_init_file_inode(struct inode *inode)
 692 {
 693         inode->i_fop = &fuse_file_operations;
 694         inode->i_data.a_ops = &fuse_file_aops;
 695 }