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   1 /*
   2   FUSE: Filesystem in Userspace
   3   Copyright (C) 2001-2006  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 #include <linux/sched.h>
  15
  16 static const struct file_operations fuse_direct_io_file_operations;
  17
  18 static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
  19                           struct fuse_open_out *outargp)
  20 {
  21         struct fuse_conn *fc = get_fuse_conn(inode);
  22         struct fuse_open_in inarg;
  23         struct fuse_req *req;
  24         int err;
  25
  26         req = fuse_get_req(fc);
  27         if (IS_ERR(req))
  28                 return PTR_ERR(req);
  29
  30         memset(&inarg, 0, sizeof(inarg));
  31         inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
  32         req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
  33         req->in.h.nodeid = get_node_id(inode);
  34         req->in.numargs = 1;
  35         req->in.args[0].size = sizeof(inarg);
  36         req->in.args[0].value = &inarg;
  37         req->out.numargs = 1;
  38         req->out.args[0].size = sizeof(*outargp);
  39         req->out.args[0].value = outargp;
  40         request_send(fc, req);
  41         err = req->out.h.error;
  42         fuse_put_request(fc, req);
  43
  44         return err;
  45 }
  46
  47 struct fuse_file *fuse_file_alloc(void)
  48 {
  49         struct fuse_file *ff;
  50         ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
  51         if (ff) {
  52                 ff->reserved_req = fuse_request_alloc();
  53                 if (!ff->reserved_req) {
  54                         kfree(ff);
  55                         ff = NULL;
  56                 }
  57                 atomic_set(&ff->count, 0);
  58         }
  59         return ff;
  60 }
  61
  62 void fuse_file_free(struct fuse_file *ff)
  63 {
  64         fuse_request_free(ff->reserved_req);
  65         kfree(ff);
  66 }
  67
  68 static struct fuse_file *fuse_file_get(struct fuse_file *ff)
  69 {
  70         atomic_inc(&ff->count);
  71         return ff;
  72 }
  73
  74 static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
  75 {
  76         dput(req->dentry);
  77         mntput(req->vfsmount);
  78         fuse_put_request(fc, req);
  79 }
  80
  81 static void fuse_file_put(struct fuse_file *ff)
  82 {
  83         if (atomic_dec_and_test(&ff->count)) {
  84                 struct fuse_req *req = ff->reserved_req;
  85                 struct fuse_conn *fc = get_fuse_conn(req->dentry->d_inode);
  86                 req->end = fuse_release_end;
  87                 request_send_background(fc, req);
  88                 kfree(ff);
  89         }
  90 }
  91
  92 void fuse_finish_open(struct inode *inode, struct file *file,
  93                       struct fuse_file *ff, struct fuse_open_out *outarg)
  94 {
  95         if (outarg->open_flags & FOPEN_DIRECT_IO)
  96                 file->f_op = &fuse_direct_io_file_operations;
  97         if (!(outarg->open_flags & FOPEN_KEEP_CACHE))
  98                 invalidate_inode_pages2(inode->i_mapping);
  99         ff->fh = outarg->fh;
 100         file->private_data = fuse_file_get(ff);
 101 }
 102
 103 int fuse_open_common(struct inode *inode, struct file *file, int isdir)
 104 {
 105         struct fuse_open_out outarg;
 106         struct fuse_file *ff;
 107         int err;
 108
 109         /* VFS checks this, but only _after_ ->open() */
 110         if (file->f_flags & O_DIRECT)
 111                 return -EINVAL;
 112
 113         err = generic_file_open(inode, file);
 114         if (err)
 115                 return err;
 116
 117         ff = fuse_file_alloc();
 118         if (!ff)
 119                 return -ENOMEM;
 120
 121         err = fuse_send_open(inode, file, isdir, &outarg);
 122         if (err)
 123                 fuse_file_free(ff);
 124         else {
 125                 if (isdir)
 126                         outarg.open_flags &= ~FOPEN_DIRECT_IO;
 127                 fuse_finish_open(inode, file, ff, &outarg);
 128         }
 129
 130         return err;
 131 }
 132
 133 void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode)
 134 {
 135         struct fuse_req *req = ff->reserved_req;
 136         struct fuse_release_in *inarg = &req->misc.release_in;
 137
 138         inarg->fh = ff->fh;
 139         inarg->flags = flags;
 140         req->in.h.opcode = opcode;
 141         req->in.h.nodeid = nodeid;
 142         req->in.numargs = 1;
 143         req->in.args[0].size = sizeof(struct fuse_release_in);
 144         req->in.args[0].value = inarg;
 145 }
 146
 147 int fuse_release_common(struct inode *inode, struct file *file, int isdir)
 148 {
 149         struct fuse_file *ff = file->private_data;
 150         if (ff) {
 151                 fuse_release_fill(ff, get_node_id(inode), file->f_flags,
 152                                   isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);
 153
 154                 /* Hold vfsmount and dentry until release is finished */
 155                 ff->reserved_req->vfsmount = mntget(file->f_path.mnt);
 156                 ff->reserved_req->dentry = dget(file->f_path.dentry);
 157                 /*
 158                  * Normally this will send the RELEASE request,
 159                  * however if some asynchronous READ or WRITE requests
 160                  * are outstanding, the sending will be delayed
 161                  */
 162                 fuse_file_put(ff);
 163         }
 164
 165         /* Return value is ignored by VFS */
 166         return 0;
 167 }
 168
 169 static int fuse_open(struct inode *inode, struct file *file)
 170 {
 171         return fuse_open_common(inode, file, 0);
 172 }
 173
 174 static int fuse_release(struct inode *inode, struct file *file)
 175 {
 176         return fuse_release_common(inode, file, 0);
 177 }
 178
 179 /*
 180  * Scramble the ID space with XTEA, so that the value of the files_struct
 181  * pointer is not exposed to userspace.
 182  */
 183 static u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
 184 {
 185         u32 *k = fc->scramble_key;
 186         u64 v = (unsigned long) id;
 187         u32 v0 = v;
 188         u32 v1 = v >> 32;
 189         u32 sum = 0;
 190         int i;
 191
 192         for (i = 0; i < 32; i++) {
 193                 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
 194                 sum += 0x9E3779B9;
 195                 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
 196         }
 197
 198         return (u64) v0 + ((u64) v1 << 32);
 199 }
 200
 201 static int fuse_flush(struct file *file, fl_owner_t id)
 202 {
 203         struct inode *inode = file->f_path.dentry->d_inode;
 204         struct fuse_conn *fc = get_fuse_conn(inode);
 205         struct fuse_file *ff = file->private_data;
 206         struct fuse_req *req;
 207         struct fuse_flush_in inarg;
 208         int err;
 209
 210         if (is_bad_inode(inode))
 211                 return -EIO;
 212
 213         if (fc->no_flush)
 214                 return 0;
 215
 216         req = fuse_get_req_nofail(fc, file);
 217         memset(&inarg, 0, sizeof(inarg));
 218         inarg.fh = ff->fh;
 219         inarg.lock_owner = fuse_lock_owner_id(fc, id);
 220         req->in.h.opcode = FUSE_FLUSH;
 221         req->in.h.nodeid = get_node_id(inode);
 222         req->in.numargs = 1;
 223         req->in.args[0].size = sizeof(inarg);
 224         req->in.args[0].value = &inarg;
 225         req->force = 1;
 226         request_send(fc, req);
 227         err = req->out.h.error;
 228         fuse_put_request(fc, req);
 229         if (err == -ENOSYS) {
 230                 fc->no_flush = 1;
 231                 err = 0;
 232         }
 233         return err;
 234 }
 235
 236 int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
 237                       int isdir)
 238 {
 239         struct inode *inode = de->d_inode;
 240         struct fuse_conn *fc = get_fuse_conn(inode);
 241         struct fuse_file *ff = file->private_data;
 242         struct fuse_req *req;
 243         struct fuse_fsync_in inarg;
 244         int err;
 245
 246         if (is_bad_inode(inode))
 247                 return -EIO;
 248
 249         if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
 250                 return 0;
 251
 252         req = fuse_get_req(fc);
 253         if (IS_ERR(req))
 254                 return PTR_ERR(req);
 255
 256         memset(&inarg, 0, sizeof(inarg));
 257         inarg.fh = ff->fh;
 258         inarg.fsync_flags = datasync ? 1 : 0;
 259         req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
 260         req->in.h.nodeid = get_node_id(inode);
 261         req->in.numargs = 1;
 262         req->in.args[0].size = sizeof(inarg);
 263         req->in.args[0].value = &inarg;
 264         request_send(fc, req);
 265         err = req->out.h.error;
 266         fuse_put_request(fc, req);
 267         if (err == -ENOSYS) {
 268                 if (isdir)
 269                         fc->no_fsyncdir = 1;
 270                 else
 271                         fc->no_fsync = 1;
 272                 err = 0;
 273         }
 274         return err;
 275 }
 276
 277 static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
 278 {
 279         return fuse_fsync_common(file, de, datasync, 0);
 280 }
 281
 282 void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff,
 283                     struct inode *inode, loff_t pos, size_t count, int opcode)
 284 {
 285         struct fuse_read_in *inarg = &req->misc.read_in;
 286
 287         inarg->fh = ff->fh;
 288         inarg->offset = pos;
 289         inarg->size = count;
 290         req->in.h.opcode = opcode;
 291         req->in.h.nodeid = get_node_id(inode);
 292         req->in.numargs = 1;
 293         req->in.args[0].size = sizeof(struct fuse_read_in);
 294         req->in.args[0].value = inarg;
 295         req->out.argpages = 1;
 296         req->out.argvar = 1;
 297         req->out.numargs = 1;
 298         req->out.args[0].size = count;
 299 }
 300
 301 static size_t fuse_send_read(struct fuse_req *req, struct file *file,
 302                              struct inode *inode, loff_t pos, size_t count)
 303 {
 304         struct fuse_conn *fc = get_fuse_conn(inode);
 305         struct fuse_file *ff = file->private_data;
 306         fuse_read_fill(req, ff, inode, pos, count, FUSE_READ);
 307         request_send(fc, req);
 308         return req->out.args[0].size;
 309 }
 310
 311 static int fuse_readpage(struct file *file, struct page *page)
 312 {
 313         struct inode *inode = page->mapping->host;
 314         struct fuse_conn *fc = get_fuse_conn(inode);
 315         struct fuse_req *req;
 316         int err;
 317
 318         err = -EIO;
 319         if (is_bad_inode(inode))
 320                 goto out;
 321
 322         req = fuse_get_req(fc);
 323         err = PTR_ERR(req);
 324         if (IS_ERR(req))
 325                 goto out;
 326
 327         req->out.page_zeroing = 1;
 328         req->num_pages = 1;
 329         req->pages[0] = page;
 330         fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);
 331         err = req->out.h.error;
 332         fuse_put_request(fc, req);
 333         if (!err)
 334                 SetPageUptodate(page);
 335         fuse_invalidate_attr(inode); /* atime changed */
 336  out:
 337         unlock_page(page);
 338         return err;
 339 }
 340
 341 static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
 342 {
 343         int i;
 344
 345         fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */
 346
 347         for (i = 0; i < req->num_pages; i++) {
 348                 struct page *page = req->pages[i];
 349                 if (!req->out.h.error)
 350                         SetPageUptodate(page);
 351                 else
 352                         SetPageError(page);
 353                 unlock_page(page);
 354         }
 355         if (req->ff)
 356                 fuse_file_put(req->ff);
 357         fuse_put_request(fc, req);
 358 }
 359
 360 static void fuse_send_readpages(struct fuse_req *req, struct fuse_file *ff,
 361                                 struct inode *inode)
 362 {
 363         struct fuse_conn *fc = get_fuse_conn(inode);
 364         loff_t pos = page_offset(req->pages[0]);
 365         size_t count = req->num_pages << PAGE_CACHE_SHIFT;
 366         req->out.page_zeroing = 1;
 367         fuse_read_fill(req, ff, inode, pos, count, FUSE_READ);
 368         if (fc->async_read) {
 369                 req->ff = fuse_file_get(ff);
 370                 req->end = fuse_readpages_end;
 371                 request_send_background(fc, req);
 372         } else {
 373                 request_send(fc, req);
 374                 fuse_readpages_end(fc, req);
 375         }
 376 }
 377
 378 struct fuse_fill_data {
 379         struct fuse_req *req;
 380         struct fuse_file *ff;
 381         struct inode *inode;
 382 };
 383
 384 static int fuse_readpages_fill(void *_data, struct page *page)
 385 {
 386         struct fuse_fill_data *data = _data;
 387         struct fuse_req *req = data->req;
 388         struct inode *inode = data->inode;
 389         struct fuse_conn *fc = get_fuse_conn(inode);
 390
 391         if (req->num_pages &&
 392             (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
 393              (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
 394              req->pages[req->num_pages - 1]->index + 1 != page->index)) {
 395                 fuse_send_readpages(req, data->ff, inode);
 396                 data->req = req = fuse_get_req(fc);
 397                 if (IS_ERR(req)) {
 398                         unlock_page(page);
 399                         return PTR_ERR(req);
 400                 }
 401         }
 402         req->pages[req->num_pages] = page;
 403         req->num_pages ++;
 404         return 0;
 405 }
 406
 407 static int fuse_readpages(struct file *file, struct address_space *mapping,
 408                           struct list_head *pages, unsigned nr_pages)
 409 {
 410         struct inode *inode = mapping->host;
 411         struct fuse_conn *fc = get_fuse_conn(inode);
 412         struct fuse_fill_data data;
 413         int err;
 414
 415         err = -EIO;
 416         if (is_bad_inode(inode))
 417                 goto out;
 418
 419         data.ff = file->private_data;
 420         data.inode = inode;
 421         data.req = fuse_get_req(fc);
 422         err = PTR_ERR(data.req);
 423         if (IS_ERR(data.req))
 424                 goto out;
 425
 426         err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
 427         if (!err) {
 428                 if (data.req->num_pages)
 429                         fuse_send_readpages(data.req, data.ff, inode);
 430                 else
 431                         fuse_put_request(fc, data.req);
 432         }
 433 out:
 434         return err;
 435 }
 436
 437 static size_t fuse_send_write(struct fuse_req *req, struct file *file,
 438                               struct inode *inode, loff_t pos, size_t count)
 439 {
 440         struct fuse_conn *fc = get_fuse_conn(inode);
 441         struct fuse_file *ff = file->private_data;
 442         struct fuse_write_in inarg;
 443         struct fuse_write_out outarg;
 444
 445         memset(&inarg, 0, sizeof(struct fuse_write_in));
 446         inarg.fh = ff->fh;
 447         inarg.offset = pos;
 448         inarg.size = count;
 449         req->in.h.opcode = FUSE_WRITE;
 450         req->in.h.nodeid = get_node_id(inode);
 451         req->in.argpages = 1;
 452         req->in.numargs = 2;
 453         req->in.args[0].size = sizeof(struct fuse_write_in);
 454         req->in.args[0].value = &inarg;
 455         req->in.args[1].size = count;
 456         req->out.numargs = 1;
 457         req->out.args[0].size = sizeof(struct fuse_write_out);
 458         req->out.args[0].value = &outarg;
 459         request_send(fc, req);
 460         return outarg.size;
 461 }
 462
 463 static int fuse_write_begin(struct file *file, struct address_space *mapping,
 464                         loff_t pos, unsigned len, unsigned flags,
 465                         struct page **pagep, void **fsdata)
 466 {
 467         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 468
 469         *pagep = __grab_cache_page(mapping, index);
 470         if (!*pagep)
 471                 return -ENOMEM;
 472         return 0;
 473 }
 474
 475 static int fuse_buffered_write(struct file *file, struct inode *inode,
 476                                loff_t pos, unsigned count, struct page *page)
 477 {
 478         int err;
 479         size_t nres;
 480         struct fuse_conn *fc = get_fuse_conn(inode);
 481         struct fuse_inode *fi = get_fuse_inode(inode);
 482         unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
 483         struct fuse_req *req;
 484
 485         if (is_bad_inode(inode))
 486                 return -EIO;
 487
 488         req = fuse_get_req(fc);
 489         if (IS_ERR(req))
 490                 return PTR_ERR(req);
 491
 492         req->num_pages = 1;
 493         req->pages[0] = page;
 494         req->page_offset = offset;
 495         nres = fuse_send_write(req, file, inode, pos, count);
 496         err = req->out.h.error;
 497         fuse_put_request(fc, req);
 498         if (!err && !nres)
 499                 err = -EIO;
 500         if (!err) {
 501                 pos += nres;
 502                 spin_lock(&fc->lock);
 503                 fi->attr_version = ++fc->attr_version;
 504                 if (pos > inode->i_size)
 505                         i_size_write(inode, pos);
 506                 spin_unlock(&fc->lock);
 507
 508                 if (count == PAGE_CACHE_SIZE)
 509                         SetPageUptodate(page);
 510         }
 511         fuse_invalidate_attr(inode);
 512         return err ? err : nres;
 513 }
 514
 515 static int fuse_write_end(struct file *file, struct address_space *mapping,
 516                         loff_t pos, unsigned len, unsigned copied,
 517                         struct page *page, void *fsdata)
 518 {
 519         struct inode *inode = mapping->host;
 520         int res = 0;
 521
 522         if (copied)
 523                 res = fuse_buffered_write(file, inode, pos, copied, page);
 524
 525         unlock_page(page);
 526         page_cache_release(page);
 527         return res;
 528 }
 529
 530 static void fuse_release_user_pages(struct fuse_req *req, int write)
 531 {
 532         unsigned i;
 533
 534         for (i = 0; i < req->num_pages; i++) {
 535                 struct page *page = req->pages[i];
 536                 if (write)
 537                         set_page_dirty_lock(page);
 538                 put_page(page);
 539         }
 540 }
 541
 542 static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
 543                                unsigned nbytes, int write)
 544 {
 545         unsigned long user_addr = (unsigned long) buf;
 546         unsigned offset = user_addr & ~PAGE_MASK;
 547         int npages;
 548
 549         /* This doesn't work with nfsd */
 550         if (!current->mm)
 551                 return -EPERM;
 552
 553         nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
 554         npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
 555         npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ);
 556         down_read(&current->mm->mmap_sem);
 557         npages = get_user_pages(current, current->mm, user_addr, npages, write,
 558                                 0, req->pages, NULL);
 559         up_read(&current->mm->mmap_sem);
 560         if (npages < 0)
 561                 return npages;
 562
 563         req->num_pages = npages;
 564         req->page_offset = offset;
 565         return 0;
 566 }
 567
 568 static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
 569                               size_t count, loff_t *ppos, int write)
 570 {
 571         struct inode *inode = file->f_path.dentry->d_inode;
 572         struct fuse_conn *fc = get_fuse_conn(inode);
 573         size_t nmax = write ? fc->max_write : fc->max_read;
 574         loff_t pos = *ppos;
 575         ssize_t res = 0;
 576         struct fuse_req *req;
 577
 578         if (is_bad_inode(inode))
 579                 return -EIO;
 580
 581         req = fuse_get_req(fc);
 582         if (IS_ERR(req))
 583                 return PTR_ERR(req);
 584
 585         while (count) {
 586                 size_t nres;
 587                 size_t nbytes = min(count, nmax);
 588                 int err = fuse_get_user_pages(req, buf, nbytes, !write);
 589                 if (err) {
 590                         res = err;
 591                         break;
 592                 }
 593                 nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
 594                 nbytes = min(count, nbytes);
 595                 if (write)
 596                         nres = fuse_send_write(req, file, inode, pos, nbytes);
 597                 else
 598                         nres = fuse_send_read(req, file, inode, pos, nbytes);
 599                 fuse_release_user_pages(req, !write);
 600                 if (req->out.h.error) {
 601                         if (!res)
 602                                 res = req->out.h.error;
 603                         break;
 604                 } else if (nres > nbytes) {
 605                         res = -EIO;
 606                         break;
 607                 }
 608                 count -= nres;
 609                 res += nres;
 610                 pos += nres;
 611                 buf += nres;
 612                 if (nres != nbytes)
 613                         break;
 614                 if (count) {
 615                         fuse_put_request(fc, req);
 616                         req = fuse_get_req(fc);
 617                         if (IS_ERR(req))
 618                                 break;
 619                 }
 620         }
 621         fuse_put_request(fc, req);
 622         if (res > 0) {
 623                 if (write) {
 624                         spin_lock(&fc->lock);
 625                         if (pos > inode->i_size)
 626                                 i_size_write(inode, pos);
 627                         spin_unlock(&fc->lock);
 628                 }
 629                 *ppos = pos;
 630         }
 631         fuse_invalidate_attr(inode);
 632
 633         return res;
 634 }
 635
 636 static ssize_t fuse_direct_read(struct file *file, char __user *buf,
 637                                      size_t count, loff_t *ppos)
 638 {
 639         return fuse_direct_io(file, buf, count, ppos, 0);
 640 }
 641
 642 static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
 643                                  size_t count, loff_t *ppos)
 644 {
 645         struct inode *inode = file->f_path.dentry->d_inode;
 646         ssize_t res;
 647         /* Don't allow parallel writes to the same file */
 648         mutex_lock(&inode->i_mutex);
 649         res = generic_write_checks(file, ppos, &count, 0);
 650         if (!res)
 651                 res = fuse_direct_io(file, buf, count, ppos, 1);
 652         mutex_unlock(&inode->i_mutex);
 653         return res;
 654 }
 655
 656 static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
 657 {
 658         if ((vma->vm_flags & VM_SHARED)) {
 659                 if ((vma->vm_flags & VM_WRITE))
 660                         return -ENODEV;
 661                 else
 662                         vma->vm_flags &= ~VM_MAYWRITE;
 663         }
 664         return generic_file_mmap(file, vma);
 665 }
 666
 667 static int fuse_set_page_dirty(struct page *page)
 668 {
 669         printk("fuse_set_page_dirty: should not happen\n");
 670         dump_stack();
 671         return 0;
 672 }
 673
 674 static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
 675                                   struct file_lock *fl)
 676 {
 677         switch (ffl->type) {
 678         case F_UNLCK:
 679                 break;
 680
 681         case F_RDLCK:
 682         case F_WRLCK:
 683                 if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
 684                     ffl->end < ffl->start)
 685                         return -EIO;
 686
 687                 fl->fl_start = ffl->start;
 688                 fl->fl_end = ffl->end;
 689                 fl->fl_pid = ffl->pid;
 690                 break;
 691
 692         default:
 693                 return -EIO;
 694         }
 695         fl->fl_type = ffl->type;
 696         return 0;
 697 }
 698
 699 static void fuse_lk_fill(struct fuse_req *req, struct file *file,
 700                          const struct file_lock *fl, int opcode, pid_t pid)
 701 {
 702         struct inode *inode = file->f_path.dentry->d_inode;
 703         struct fuse_conn *fc = get_fuse_conn(inode);
 704         struct fuse_file *ff = file->private_data;
 705         struct fuse_lk_in *arg = &req->misc.lk_in;
 706
 707         arg->fh = ff->fh;
 708         arg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
 709         arg->lk.start = fl->fl_start;
 710         arg->lk.end = fl->fl_end;
 711         arg->lk.type = fl->fl_type;
 712         arg->lk.pid = pid;
 713         req->in.h.opcode = opcode;
 714         req->in.h.nodeid = get_node_id(inode);
 715         req->in.numargs = 1;
 716         req->in.args[0].size = sizeof(*arg);
 717         req->in.args[0].value = arg;
 718 }
 719
 720 static int fuse_getlk(struct file *file, struct file_lock *fl)
 721 {
 722         struct inode *inode = file->f_path.dentry->d_inode;
 723         struct fuse_conn *fc = get_fuse_conn(inode);
 724         struct fuse_req *req;
 725         struct fuse_lk_out outarg;
 726         int err;
 727
 728         req = fuse_get_req(fc);
 729         if (IS_ERR(req))
 730                 return PTR_ERR(req);
 731
 732         fuse_lk_fill(req, file, fl, FUSE_GETLK, 0);
 733         req->out.numargs = 1;
 734         req->out.args[0].size = sizeof(outarg);
 735         req->out.args[0].value = &outarg;
 736         request_send(fc, req);
 737         err = req->out.h.error;
 738         fuse_put_request(fc, req);
 739         if (!err)
 740                 err = convert_fuse_file_lock(&outarg.lk, fl);
 741
 742         return err;
 743 }
 744
 745 static int fuse_setlk(struct file *file, struct file_lock *fl)
 746 {
 747         struct inode *inode = file->f_path.dentry->d_inode;
 748         struct fuse_conn *fc = get_fuse_conn(inode);
 749         struct fuse_req *req;
 750         int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
 751         pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
 752         int err;
 753
 754         /* Unlock on close is handled by the flush method */
 755         if (fl->fl_flags & FL_CLOSE)
 756                 return 0;
 757
 758         req = fuse_get_req(fc);
 759         if (IS_ERR(req))
 760                 return PTR_ERR(req);
 761
 762         fuse_lk_fill(req, file, fl, opcode, pid);
 763         request_send(fc, req);
 764         err = req->out.h.error;
 765         /* locking is restartable */
 766         if (err == -EINTR)
 767                 err = -ERESTARTSYS;
 768         fuse_put_request(fc, req);
 769         return err;
 770 }
 771
 772 static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
 773 {
 774         struct inode *inode = file->f_path.dentry->d_inode;
 775         struct fuse_conn *fc = get_fuse_conn(inode);
 776         int err;
 777
 778         if (cmd == F_GETLK) {
 779                 if (fc->no_lock) {
 780                         posix_test_lock(file, fl);
 781                         err = 0;
 782                 } else
 783                         err = fuse_getlk(file, fl);
 784         } else {
 785                 if (fc->no_lock)
 786                         err = posix_lock_file_wait(file, fl);
 787                 else
 788                         err = fuse_setlk(file, fl);
 789         }
 790         return err;
 791 }
 792
 793 static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
 794 {
 795         struct inode *inode = mapping->host;
 796         struct fuse_conn *fc = get_fuse_conn(inode);
 797         struct fuse_req *req;
 798         struct fuse_bmap_in inarg;
 799         struct fuse_bmap_out outarg;
 800         int err;
 801
 802         if (!inode->i_sb->s_bdev || fc->no_bmap)
 803                 return 0;
 804
 805         req = fuse_get_req(fc);
 806         if (IS_ERR(req))
 807                 return 0;
 808
 809         memset(&inarg, 0, sizeof(inarg));
 810         inarg.block = block;
 811         inarg.blocksize = inode->i_sb->s_blocksize;
 812         req->in.h.opcode = FUSE_BMAP;
 813         req->in.h.nodeid = get_node_id(inode);
 814         req->in.numargs = 1;
 815         req->in.args[0].size = sizeof(inarg);
 816         req->in.args[0].value = &inarg;
 817         req->out.numargs = 1;
 818         req->out.args[0].size = sizeof(outarg);
 819         req->out.args[0].value = &outarg;
 820         request_send(fc, req);
 821         err = req->out.h.error;
 822         fuse_put_request(fc, req);
 823         if (err == -ENOSYS)
 824                 fc->no_bmap = 1;
 825
 826         return err ? 0 : outarg.block;
 827 }
 828
 829 static const struct file_operations fuse_file_operations = {
 830         .llseek         = generic_file_llseek,
 831         .read           = do_sync_read,
 832         .aio_read       = generic_file_aio_read,
 833         .write          = do_sync_write,
 834         .aio_write      = generic_file_aio_write,
 835         .mmap           = fuse_file_mmap,
 836         .open           = fuse_open,
 837         .flush          = fuse_flush,
 838         .release        = fuse_release,
 839         .fsync          = fuse_fsync,
 840         .lock           = fuse_file_lock,
 841         .splice_read    = generic_file_splice_read,
 842 };
 843
 844 static const struct file_operations fuse_direct_io_file_operations = {
 845         .llseek         = generic_file_llseek,
 846         .read           = fuse_direct_read,
 847         .write          = fuse_direct_write,
 848         .open           = fuse_open,
 849         .flush          = fuse_flush,
 850         .release        = fuse_release,
 851         .fsync          = fuse_fsync,
 852         .lock           = fuse_file_lock,
 853         /* no mmap and splice_read */
 854 };
 855
 856 static const struct address_space_operations fuse_file_aops  = {
 857         .readpage       = fuse_readpage,
 858         .write_begin    = fuse_write_begin,
 859         .write_end      = fuse_write_end,
 860         .readpages      = fuse_readpages,
 861         .set_page_dirty = fuse_set_page_dirty,
 862         .bmap           = fuse_bmap,
 863 };
 864
 865 void fuse_init_file_inode(struct inode *inode)
 866 {
 867         inode->i_fop = &fuse_file_operations;
 868         inode->i_data.a_ops = &fuse_file_aops;
 869 }