1 /* 2 * linux/fs/nfs/file.c 3 * 4 * Copyright (C) 1992 Rick Sladkey 5 * 6 * Changes Copyright (C) 1994 by Florian La Roche 7 * - Do not copy data too often around in the kernel. 8 * - In nfs_file_read the return value of kmalloc wasn't checked. 9 * - Put in a better version of read look-ahead buffering. Original idea 10 * and implementation by Wai S Kok elekokws@ee.nus.sg. 11 * 12 * Expire cache on write to a file by Wai S Kok (Oct 1994). 13 * 14 * Total rewrite of read side for new NFS buffer cache.. Linus. 15 * 16 * nfs regular file handling functions 17 */ 18 19 #include <linux/time.h> 20 #include <linux/kernel.h> 21 #include <linux/errno.h> 22 #include <linux/fcntl.h> 23 #include <linux/stat.h> 24 #include <linux/nfs_fs.h> 25 #include <linux/nfs_mount.h> 26 #include <linux/mm.h> 27 #include <linux/slab.h> 28 #include <linux/pagemap.h> 29 #include <linux/smp_lock.h> 30 #include <linux/aio.h> 31 32 #include <asm/uaccess.h> 33 #include <asm/system.h> 34 35 #include "delegation.h" 36 #include "internal.h" 37 #include "iostat.h" 38 39 #define NFSDBG_FACILITY NFSDBG_FILE 40 41 static int nfs_file_open(struct inode *, struct file *); 42 static int nfs_file_release(struct inode *, struct file *); 43 static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); 44 static int nfs_file_mmap(struct file *, struct vm_area_struct *); 45 static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, 46 struct pipe_inode_info *pipe, 47 size_t count, unsigned int flags); 48 static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, 49 unsigned long nr_segs, loff_t pos); 50 static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, 51 unsigned long nr_segs, loff_t pos); 52 static int nfs_file_flush(struct file *, fl_owner_t id); 53 static int nfs_file_fsync(struct file *, struct dentry *dentry, int datasync); 54 static int nfs_check_flags(int flags); 55 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); 56 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); 57 static int nfs_setlease(struct file *file, long arg, struct file_lock **fl); 58 59 static struct vm_operations_struct nfs_file_vm_ops; 60 61 const struct file_operations nfs_file_operations = { 62 .llseek = nfs_file_llseek, 63 .read = do_sync_read, 64 .write = do_sync_write, 65 .aio_read = nfs_file_read, 66 .aio_write = nfs_file_write, 67 #ifdef CONFIG_MMU 68 .mmap = nfs_file_mmap, 69 #else 70 .mmap = generic_file_mmap, 71 #endif 72 .open = nfs_file_open, 73 .flush = nfs_file_flush, 74 .release = nfs_file_release, 75 .fsync = nfs_file_fsync, 76 .lock = nfs_lock, 77 .flock = nfs_flock, 78 .splice_read = nfs_file_splice_read, 79 .check_flags = nfs_check_flags, 80 .setlease = nfs_setlease, 81 }; 82 83 const struct inode_operations nfs_file_inode_operations = { 84 .permission = nfs_permission, 85 .getattr = nfs_getattr, 86 .setattr = nfs_setattr, 87 }; 88 89 #ifdef CONFIG_NFS_V3 90 const struct inode_operations nfs3_file_inode_operations = { 91 .permission = nfs_permission, 92 .getattr = nfs_getattr, 93 .setattr = nfs_setattr, 94 .listxattr = nfs3_listxattr, 95 .getxattr = nfs3_getxattr, 96 .setxattr = nfs3_setxattr, 97 .removexattr = nfs3_removexattr, 98 }; 99 #endif /* CONFIG_NFS_v3 */ 100 101 /* Hack for future NFS swap support */ 102 #ifndef IS_SWAPFILE 103 # define IS_SWAPFILE(inode) (0) 104 #endif 105 106 static int nfs_check_flags(int flags) 107 { 108 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) 109 return -EINVAL; 110 111 return 0; 112 } 113 114 /* 115 * Open file 116 */ 117 static int 118 nfs_file_open(struct inode *inode, struct file *filp) 119 { 120 int res; 121 122 dprintk("NFS: open file(%s/%s)\n", 123 filp->f_path.dentry->d_parent->d_name.name, 124 filp->f_path.dentry->d_name.name); 125 126 res = nfs_check_flags(filp->f_flags); 127 if (res) 128 return res; 129 130 nfs_inc_stats(inode, NFSIOS_VFSOPEN); 131 res = nfs_open(inode, filp); 132 return res; 133 } 134 135 static int 136 nfs_file_release(struct inode *inode, struct file *filp) 137 { 138 struct dentry *dentry = filp->f_path.dentry; 139 140 dprintk("NFS: release(%s/%s)\n", 141 dentry->d_parent->d_name.name, 142 dentry->d_name.name); 143 144 /* Ensure that dirty pages are flushed out with the right creds */ 145 if (filp->f_mode & FMODE_WRITE) 146 nfs_wb_all(dentry->d_inode); 147 nfs_inc_stats(inode, NFSIOS_VFSRELEASE); 148 return nfs_release(inode, filp); 149 } 150 151 /** 152 * nfs_revalidate_size - Revalidate the file size 153 * @inode - pointer to inode struct 154 * @file - pointer to struct file 155 * 156 * Revalidates the file length. This is basically a wrapper around 157 * nfs_revalidate_inode() that takes into account the fact that we may 158 * have cached writes (in which case we don't care about the server's 159 * idea of what the file length is), or O_DIRECT (in which case we 160 * shouldn't trust the cache). 161 */ 162 static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) 163 { 164 struct nfs_server *server = NFS_SERVER(inode); 165 struct nfs_inode *nfsi = NFS_I(inode); 166 167 if (server->flags & NFS_MOUNT_NOAC) 168 goto force_reval; 169 if (filp->f_flags & O_DIRECT) 170 goto force_reval; 171 if (nfsi->npages != 0) 172 return 0; 173 if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) 174 return 0; 175 force_reval: 176 return __nfs_revalidate_inode(server, inode); 177 } 178 179 static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) 180 { 181 loff_t loff; 182 183 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", 184 filp->f_path.dentry->d_parent->d_name.name, 185 filp->f_path.dentry->d_name.name, 186 offset, origin); 187 188 /* origin == SEEK_END => we must revalidate the cached file length */ 189 if (origin == SEEK_END) { 190 struct inode *inode = filp->f_mapping->host; 191 192 int retval = nfs_revalidate_file_size(inode, filp); 193 if (retval < 0) 194 return (loff_t)retval; 195 196 spin_lock(&inode->i_lock); 197 loff = generic_file_llseek_unlocked(filp, offset, origin); 198 spin_unlock(&inode->i_lock); 199 } else 200 loff = generic_file_llseek_unlocked(filp, offset, origin); 201 return loff; 202 } 203 204 /* 205 * Helper for nfs_file_flush() and nfs_file_fsync() 206 * 207 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to 208 * disk, but it retrieves and clears ctx->error after synching, despite 209 * the two being set at the same time in nfs_context_set_write_error(). 210 * This is because the former is used to notify the _next_ call to 211 * nfs_file_write() that a write error occured, and hence cause it to 212 * fall back to doing a synchronous write. 213 */ 214 static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) 215 { 216 int have_error, status; 217 int ret = 0; 218 219 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 220 status = nfs_wb_all(inode); 221 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 222 if (have_error) 223 ret = xchg(&ctx->error, 0); 224 if (!ret) 225 ret = status; 226 return ret; 227 } 228 229 /* 230 * Flush all dirty pages, and check for write errors. 231 */ 232 static int 233 nfs_file_flush(struct file *file, fl_owner_t id) 234 { 235 struct nfs_open_context *ctx = nfs_file_open_context(file); 236 struct dentry *dentry = file->f_path.dentry; 237 struct inode *inode = dentry->d_inode; 238 int status; 239 240 dprintk("NFS: flush(%s/%s)\n", 241 dentry->d_parent->d_name.name, 242 dentry->d_name.name); 243 244 if ((file->f_mode & FMODE_WRITE) == 0) 245 return 0; 246 nfs_inc_stats(inode, NFSIOS_VFSFLUSH); 247 248 /* Ensure that data+attribute caches are up to date after close() */ 249 status = nfs_do_fsync(ctx, inode); 250 if (!status) 251 nfs_revalidate_inode(NFS_SERVER(inode), inode); 252 return status; 253 } 254 255 static ssize_t 256 nfs_file_read(struct kiocb *iocb, const struct iovec *iov, 257 unsigned long nr_segs, loff_t pos) 258 { 259 struct dentry * dentry = iocb->ki_filp->f_path.dentry; 260 struct inode * inode = dentry->d_inode; 261 ssize_t result; 262 size_t count = iov_length(iov, nr_segs); 263 264 if (iocb->ki_filp->f_flags & O_DIRECT) 265 return nfs_file_direct_read(iocb, iov, nr_segs, pos); 266 267 dprintk("NFS: read(%s/%s, %lu@%lu)\n", 268 dentry->d_parent->d_name.name, dentry->d_name.name, 269 (unsigned long) count, (unsigned long) pos); 270 271 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); 272 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); 273 if (!result) 274 result = generic_file_aio_read(iocb, iov, nr_segs, pos); 275 return result; 276 } 277 278 static ssize_t 279 nfs_file_splice_read(struct file *filp, loff_t *ppos, 280 struct pipe_inode_info *pipe, size_t count, 281 unsigned int flags) 282 { 283 struct dentry *dentry = filp->f_path.dentry; 284 struct inode *inode = dentry->d_inode; 285 ssize_t res; 286 287 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", 288 dentry->d_parent->d_name.name, dentry->d_name.name, 289 (unsigned long) count, (unsigned long long) *ppos); 290 291 res = nfs_revalidate_mapping(inode, filp->f_mapping); 292 if (!res) 293 res = generic_file_splice_read(filp, ppos, pipe, count, flags); 294 return res; 295 } 296 297 static int 298 nfs_file_mmap(struct file * file, struct vm_area_struct * vma) 299 { 300 struct dentry *dentry = file->f_path.dentry; 301 struct inode *inode = dentry->d_inode; 302 int status; 303 304 dprintk("NFS: mmap(%s/%s)\n", 305 dentry->d_parent->d_name.name, dentry->d_name.name); 306 307 status = nfs_revalidate_mapping(inode, file->f_mapping); 308 if (!status) { 309 vma->vm_ops = &nfs_file_vm_ops; 310 vma->vm_flags |= VM_CAN_NONLINEAR; 311 file_accessed(file); 312 } 313 return status; 314 } 315 316 /* 317 * Flush any dirty pages for this process, and check for write errors. 318 * The return status from this call provides a reliable indication of 319 * whether any write errors occurred for this process. 320 */ 321 static int 322 nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) 323 { 324 struct nfs_open_context *ctx = nfs_file_open_context(file); 325 struct inode *inode = dentry->d_inode; 326 327 dprintk("NFS: fsync file(%s/%s) datasync %d\n", 328 dentry->d_parent->d_name.name, dentry->d_name.name, 329 datasync); 330 331 nfs_inc_stats(inode, NFSIOS_VFSFSYNC); 332 return nfs_do_fsync(ctx, inode); 333 } 334 335 /* 336 * This does the "real" work of the write. We must allocate and lock the 337 * page to be sent back to the generic routine, which then copies the 338 * data from user space. 339 * 340 * If the writer ends up delaying the write, the writer needs to 341 * increment the page use counts until he is done with the page. 342 */ 343 static int nfs_write_begin(struct file *file, struct address_space *mapping, 344 loff_t pos, unsigned len, unsigned flags, 345 struct page **pagep, void **fsdata) 346 { 347 int ret; 348 pgoff_t index; 349 struct page *page; 350 index = pos >> PAGE_CACHE_SHIFT; 351 352 dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", 353 file->f_path.dentry->d_parent->d_name.name, 354 file->f_path.dentry->d_name.name, 355 mapping->host->i_ino, len, (long long) pos); 356 357 page = __grab_cache_page(mapping, index); 358 if (!page) 359 return -ENOMEM; 360 *pagep = page; 361 362 ret = nfs_flush_incompatible(file, page); 363 if (ret) { 364 unlock_page(page); 365 page_cache_release(page); 366 } 367 return ret; 368 } 369 370 static int nfs_write_end(struct file *file, struct address_space *mapping, 371 loff_t pos, unsigned len, unsigned copied, 372 struct page *page, void *fsdata) 373 { 374 unsigned offset = pos & (PAGE_CACHE_SIZE - 1); 375 int status; 376 377 dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", 378 file->f_path.dentry->d_parent->d_name.name, 379 file->f_path.dentry->d_name.name, 380 mapping->host->i_ino, len, (long long) pos); 381 382 /* 383 * Zero any uninitialised parts of the page, and then mark the page 384 * as up to date if it turns out that we're extending the file. 385 */ 386 if (!PageUptodate(page)) { 387 unsigned pglen = nfs_page_length(page); 388 unsigned end = offset + len; 389 390 if (pglen == 0) { 391 zero_user_segments(page, 0, offset, 392 end, PAGE_CACHE_SIZE); 393 SetPageUptodate(page); 394 } else if (end >= pglen) { 395 zero_user_segment(page, end, PAGE_CACHE_SIZE); 396 if (offset == 0) 397 SetPageUptodate(page); 398 } else 399 zero_user_segment(page, pglen, PAGE_CACHE_SIZE); 400 } 401 402 status = nfs_updatepage(file, page, offset, copied); 403 404 unlock_page(page); 405 page_cache_release(page); 406 407 if (status < 0) 408 return status; 409 return copied; 410 } 411 412 static void nfs_invalidate_page(struct page *page, unsigned long offset) 413 { 414 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); 415 416 if (offset != 0) 417 return; 418 /* Cancel any unstarted writes on this page */ 419 nfs_wb_page_cancel(page->mapping->host, page); 420 } 421 422 static int nfs_release_page(struct page *page, gfp_t gfp) 423 { 424 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); 425 426 /* If PagePrivate() is set, then the page is not freeable */ 427 return 0; 428 } 429 430 static int nfs_launder_page(struct page *page) 431 { 432 struct inode *inode = page->mapping->host; 433 434 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", 435 inode->i_ino, (long long)page_offset(page)); 436 437 return nfs_wb_page(inode, page); 438 } 439 440 const struct address_space_operations nfs_file_aops = { 441 .readpage = nfs_readpage, 442 .readpages = nfs_readpages, 443 .set_page_dirty = __set_page_dirty_nobuffers, 444 .writepage = nfs_writepage, 445 .writepages = nfs_writepages, 446 .write_begin = nfs_write_begin, 447 .write_end = nfs_write_end, 448 .invalidatepage = nfs_invalidate_page, 449 .releasepage = nfs_release_page, 450 .direct_IO = nfs_direct_IO, 451 .launder_page = nfs_launder_page, 452 }; 453 454 static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) 455 { 456 struct file *filp = vma->vm_file; 457 struct dentry *dentry = filp->f_path.dentry; 458 unsigned pagelen; 459 int ret = -EINVAL; 460 struct address_space *mapping; 461 462 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", 463 dentry->d_parent->d_name.name, dentry->d_name.name, 464 filp->f_mapping->host->i_ino, 465 (long long)page_offset(page)); 466 467 lock_page(page); 468 mapping = page->mapping; 469 if (mapping != dentry->d_inode->i_mapping) 470 goto out_unlock; 471 472 ret = 0; 473 pagelen = nfs_page_length(page); 474 if (pagelen == 0) 475 goto out_unlock; 476 477 ret = nfs_flush_incompatible(filp, page); 478 if (ret != 0) 479 goto out_unlock; 480 481 ret = nfs_updatepage(filp, page, 0, pagelen); 482 if (ret == 0) 483 ret = pagelen; 484 out_unlock: 485 unlock_page(page); 486 return ret; 487 } 488 489 static struct vm_operations_struct nfs_file_vm_ops = { 490 .fault = filemap_fault, 491 .page_mkwrite = nfs_vm_page_mkwrite, 492 }; 493 494 static int nfs_need_sync_write(struct file *filp, struct inode *inode) 495 { 496 struct nfs_open_context *ctx; 497 498 if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) 499 return 1; 500 ctx = nfs_file_open_context(filp); 501 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) 502 return 1; 503 return 0; 504 } 505 506 static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, 507 unsigned long nr_segs, loff_t pos) 508 { 509 struct dentry * dentry = iocb->ki_filp->f_path.dentry; 510 struct inode * inode = dentry->d_inode; 511 ssize_t result; 512 size_t count = iov_length(iov, nr_segs); 513 514 if (iocb->ki_filp->f_flags & O_DIRECT) 515 return nfs_file_direct_write(iocb, iov, nr_segs, pos); 516 517 dprintk("NFS: write(%s/%s, %lu@%Ld)\n", 518 dentry->d_parent->d_name.name, dentry->d_name.name, 519 (unsigned long) count, (long long) pos); 520 521 result = -EBUSY; 522 if (IS_SWAPFILE(inode)) 523 goto out_swapfile; 524 /* 525 * O_APPEND implies that we must revalidate the file length. 526 */ 527 if (iocb->ki_filp->f_flags & O_APPEND) { 528 result = nfs_revalidate_file_size(inode, iocb->ki_filp); 529 if (result) 530 goto out; 531 } 532 533 result = count; 534 if (!count) 535 goto out; 536 537 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); 538 result = generic_file_aio_write(iocb, iov, nr_segs, pos); 539 /* Return error values for O_SYNC and IS_SYNC() */ 540 if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { 541 int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); 542 if (err < 0) 543 result = err; 544 } 545 out: 546 return result; 547 548 out_swapfile: 549 printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); 550 goto out; 551 } 552 553 static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) 554 { 555 struct inode *inode = filp->f_mapping->host; 556 int status = 0; 557 558 lock_kernel(); 559 /* Try local locking first */ 560 posix_test_lock(filp, fl); 561 if (fl->fl_type != F_UNLCK) { 562 /* found a conflict */ 563 goto out; 564 } 565 566 if (nfs_have_delegation(inode, FMODE_READ)) 567 goto out_noconflict; 568 569 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) 570 goto out_noconflict; 571 572 status = NFS_PROTO(inode)->lock(filp, cmd, fl); 573 out: 574 unlock_kernel(); 575 return status; 576 out_noconflict: 577 fl->fl_type = F_UNLCK; 578 goto out; 579 } 580 581 static int do_vfs_lock(struct file *file, struct file_lock *fl) 582 { 583 int res = 0; 584 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 585 case FL_POSIX: 586 res = posix_lock_file_wait(file, fl); 587 break; 588 case FL_FLOCK: 589 res = flock_lock_file_wait(file, fl); 590 break; 591 default: 592 BUG(); 593 } 594 if (res < 0) 595 dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" 596 " - error %d!\n", 597 __func__, res); 598 return res; 599 } 600 601 static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) 602 { 603 struct inode *inode = filp->f_mapping->host; 604 int status; 605 606 /* 607 * Flush all pending writes before doing anything 608 * with locks.. 609 */ 610 nfs_sync_mapping(filp->f_mapping); 611 612 /* NOTE: special case 613 * If we're signalled while cleaning up locks on process exit, we 614 * still need to complete the unlock. 615 */ 616 lock_kernel(); 617 /* Use local locking if mounted with "-onolock" */ 618 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) 619 status = NFS_PROTO(inode)->lock(filp, cmd, fl); 620 else 621 status = do_vfs_lock(filp, fl); 622 unlock_kernel(); 623 return status; 624 } 625 626 static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) 627 { 628 struct inode *inode = filp->f_mapping->host; 629 int status; 630 631 /* 632 * Flush all pending writes before doing anything 633 * with locks.. 634 */ 635 status = nfs_sync_mapping(filp->f_mapping); 636 if (status != 0) 637 goto out; 638 639 lock_kernel(); 640 /* Use local locking if mounted with "-onolock" */ 641 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) 642 status = NFS_PROTO(inode)->lock(filp, cmd, fl); 643 else 644 status = do_vfs_lock(filp, fl); 645 unlock_kernel(); 646 if (status < 0) 647 goto out; 648 /* 649 * Make sure we clear the cache whenever we try to get the lock. 650 * This makes locking act as a cache coherency point. 651 */ 652 nfs_sync_mapping(filp->f_mapping); 653 if (!nfs_have_delegation(inode, FMODE_READ)) 654 nfs_zap_caches(inode); 655 out: 656 return status; 657 } 658 659 /* 660 * Lock a (portion of) a file 661 */ 662 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) 663 { 664 struct inode *inode = filp->f_mapping->host; 665 int ret = -ENOLCK; 666 667 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", 668 filp->f_path.dentry->d_parent->d_name.name, 669 filp->f_path.dentry->d_name.name, 670 fl->fl_type, fl->fl_flags, 671 (long long)fl->fl_start, (long long)fl->fl_end); 672 673 nfs_inc_stats(inode, NFSIOS_VFSLOCK); 674 675 /* No mandatory locks over NFS */ 676 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) 677 goto out_err; 678 679 if (NFS_PROTO(inode)->lock_check_bounds != NULL) { 680 ret = NFS_PROTO(inode)->lock_check_bounds(fl); 681 if (ret < 0) 682 goto out_err; 683 } 684 685 if (IS_GETLK(cmd)) 686 ret = do_getlk(filp, cmd, fl); 687 else if (fl->fl_type == F_UNLCK) 688 ret = do_unlk(filp, cmd, fl); 689 else 690 ret = do_setlk(filp, cmd, fl); 691 out_err: 692 return ret; 693 } 694 695 /* 696 * Lock a (portion of) a file 697 */ 698 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) 699 { 700 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", 701 filp->f_path.dentry->d_parent->d_name.name, 702 filp->f_path.dentry->d_name.name, 703 fl->fl_type, fl->fl_flags); 704 705 if (!(fl->fl_flags & FL_FLOCK)) 706 return -ENOLCK; 707 708 /* We're simulating flock() locks using posix locks on the server */ 709 fl->fl_owner = (fl_owner_t)filp; 710 fl->fl_start = 0; 711 fl->fl_end = OFFSET_MAX; 712 713 if (fl->fl_type == F_UNLCK) 714 return do_unlk(filp, cmd, fl); 715 return do_setlk(filp, cmd, fl); 716 } 717 718 /* 719 * There is no protocol support for leases, so we have no way to implement 720 * them correctly in the face of opens by other clients. 721 */ 722 static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) 723 { 724 dprintk("NFS: setlease(%s/%s, arg=%ld)\n", 725 file->f_path.dentry->d_parent->d_name.name, 726 file->f_path.dentry->d_name.name, arg); 727 728 return -EINVAL; 729 } 730