fs/fuse/file.c

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