1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/pagemap.h> 15 #include <linux/uio.h> 16 #include <linux/blkdev.h> 17 #include <linux/mm.h> 18 #include <linux/mount.h> 19 #include <linux/fs.h> 20 #include <linux/gfs2_ondisk.h> 21 #include <linux/ext2_fs.h> 22 #include <linux/crc32.h> 23 #include <linux/writeback.h> 24 #include <asm/uaccess.h> 25 #include <linux/dlm.h> 26 #include <linux/dlm_plock.h> 27 28 #include "gfs2.h" 29 #include "incore.h" 30 #include "bmap.h" 31 #include "dir.h" 32 #include "glock.h" 33 #include "glops.h" 34 #include "inode.h" 35 #include "log.h" 36 #include "meta_io.h" 37 #include "quota.h" 38 #include "rgrp.h" 39 #include "trans.h" 40 #include "util.h" 41 42 /** 43 * gfs2_llseek - seek to a location in a file 44 * @file: the file 45 * @offset: the offset 46 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) 47 * 48 * SEEK_END requires the glock for the file because it references the 49 * file's size. 50 * 51 * Returns: The new offset, or errno 52 */ 53 54 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) 55 { 56 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 57 struct gfs2_holder i_gh; 58 loff_t error; 59 60 if (origin == 2) { 61 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, 62 &i_gh); 63 if (!error) { 64 error = generic_file_llseek_unlocked(file, offset, origin); 65 gfs2_glock_dq_uninit(&i_gh); 66 } 67 } else 68 error = generic_file_llseek_unlocked(file, offset, origin); 69 70 return error; 71 } 72 73 /** 74 * gfs2_readdir - Read directory entries from a directory 75 * @file: The directory to read from 76 * @dirent: Buffer for dirents 77 * @filldir: Function used to do the copying 78 * 79 * Returns: errno 80 */ 81 82 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) 83 { 84 struct inode *dir = file->f_mapping->host; 85 struct gfs2_inode *dip = GFS2_I(dir); 86 struct gfs2_holder d_gh; 87 u64 offset = file->f_pos; 88 int error; 89 90 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 91 error = gfs2_glock_nq(&d_gh); 92 if (error) { 93 gfs2_holder_uninit(&d_gh); 94 return error; 95 } 96 97 error = gfs2_dir_read(dir, &offset, dirent, filldir); 98 99 gfs2_glock_dq_uninit(&d_gh); 100 101 file->f_pos = offset; 102 103 return error; 104 } 105 106 /** 107 * fsflags_cvt 108 * @table: A table of 32 u32 flags 109 * @val: a 32 bit value to convert 110 * 111 * This function can be used to convert between fsflags values and 112 * GFS2's own flags values. 113 * 114 * Returns: the converted flags 115 */ 116 static u32 fsflags_cvt(const u32 *table, u32 val) 117 { 118 u32 res = 0; 119 while(val) { 120 if (val & 1) 121 res |= *table; 122 table++; 123 val >>= 1; 124 } 125 return res; 126 } 127 128 static const u32 fsflags_to_gfs2[32] = { 129 [3] = GFS2_DIF_SYNC, 130 [4] = GFS2_DIF_IMMUTABLE, 131 [5] = GFS2_DIF_APPENDONLY, 132 [7] = GFS2_DIF_NOATIME, 133 [12] = GFS2_DIF_EXHASH, 134 [14] = GFS2_DIF_INHERIT_JDATA, 135 }; 136 137 static const u32 gfs2_to_fsflags[32] = { 138 [gfs2fl_Sync] = FS_SYNC_FL, 139 [gfs2fl_Immutable] = FS_IMMUTABLE_FL, 140 [gfs2fl_AppendOnly] = FS_APPEND_FL, 141 [gfs2fl_NoAtime] = FS_NOATIME_FL, 142 [gfs2fl_ExHash] = FS_INDEX_FL, 143 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, 144 }; 145 146 static int gfs2_get_flags(struct file *filp, u32 __user *ptr) 147 { 148 struct inode *inode = filp->f_path.dentry->d_inode; 149 struct gfs2_inode *ip = GFS2_I(inode); 150 struct gfs2_holder gh; 151 int error; 152 u32 fsflags; 153 154 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 155 error = gfs2_glock_nq(&gh); 156 if (error) 157 return error; 158 159 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); 160 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) 161 fsflags |= FS_JOURNAL_DATA_FL; 162 if (put_user(fsflags, ptr)) 163 error = -EFAULT; 164 165 gfs2_glock_dq(&gh); 166 gfs2_holder_uninit(&gh); 167 return error; 168 } 169 170 void gfs2_set_inode_flags(struct inode *inode) 171 { 172 struct gfs2_inode *ip = GFS2_I(inode); 173 unsigned int flags = inode->i_flags; 174 175 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 176 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) 177 flags |= S_IMMUTABLE; 178 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) 179 flags |= S_APPEND; 180 if (ip->i_diskflags & GFS2_DIF_NOATIME) 181 flags |= S_NOATIME; 182 if (ip->i_diskflags & GFS2_DIF_SYNC) 183 flags |= S_SYNC; 184 inode->i_flags = flags; 185 } 186 187 /* Flags that can be set by user space */ 188 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ 189 GFS2_DIF_IMMUTABLE| \ 190 GFS2_DIF_APPENDONLY| \ 191 GFS2_DIF_NOATIME| \ 192 GFS2_DIF_SYNC| \ 193 GFS2_DIF_SYSTEM| \ 194 GFS2_DIF_INHERIT_JDATA) 195 196 /** 197 * gfs2_set_flags - set flags on an inode 198 * @inode: The inode 199 * @flags: The flags to set 200 * @mask: Indicates which flags are valid 201 * 202 */ 203 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) 204 { 205 struct inode *inode = filp->f_path.dentry->d_inode; 206 struct gfs2_inode *ip = GFS2_I(inode); 207 struct gfs2_sbd *sdp = GFS2_SB(inode); 208 struct buffer_head *bh; 209 struct gfs2_holder gh; 210 int error; 211 u32 new_flags, flags; 212 213 error = mnt_want_write(filp->f_path.mnt); 214 if (error) 215 return error; 216 217 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 218 if (error) 219 goto out_drop_write; 220 221 flags = ip->i_diskflags; 222 new_flags = (flags & ~mask) | (reqflags & mask); 223 if ((new_flags ^ flags) == 0) 224 goto out; 225 226 error = -EINVAL; 227 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) 228 goto out; 229 230 error = -EPERM; 231 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) 232 goto out; 233 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) 234 goto out; 235 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && 236 !capable(CAP_LINUX_IMMUTABLE)) 237 goto out; 238 if (!IS_IMMUTABLE(inode)) { 239 error = gfs2_permission(inode, MAY_WRITE); 240 if (error) 241 goto out; 242 } 243 if ((flags ^ new_flags) & GFS2_DIF_JDATA) { 244 if (flags & GFS2_DIF_JDATA) 245 gfs2_log_flush(sdp, ip->i_gl); 246 error = filemap_fdatawrite(inode->i_mapping); 247 if (error) 248 goto out; 249 error = filemap_fdatawait(inode->i_mapping); 250 if (error) 251 goto out; 252 } 253 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 254 if (error) 255 goto out; 256 error = gfs2_meta_inode_buffer(ip, &bh); 257 if (error) 258 goto out_trans_end; 259 gfs2_trans_add_bh(ip->i_gl, bh, 1); 260 ip->i_diskflags = new_flags; 261 gfs2_dinode_out(ip, bh->b_data); 262 brelse(bh); 263 gfs2_set_inode_flags(inode); 264 gfs2_set_aops(inode); 265 out_trans_end: 266 gfs2_trans_end(sdp); 267 out: 268 gfs2_glock_dq_uninit(&gh); 269 out_drop_write: 270 mnt_drop_write(filp->f_path.mnt); 271 return error; 272 } 273 274 static int gfs2_set_flags(struct file *filp, u32 __user *ptr) 275 { 276 struct inode *inode = filp->f_path.dentry->d_inode; 277 u32 fsflags, gfsflags; 278 if (get_user(fsflags, ptr)) 279 return -EFAULT; 280 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); 281 if (!S_ISDIR(inode->i_mode)) { 282 if (gfsflags & GFS2_DIF_INHERIT_JDATA) 283 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); 284 return do_gfs2_set_flags(filp, gfsflags, ~0); 285 } 286 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); 287 } 288 289 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 290 { 291 switch(cmd) { 292 case FS_IOC_GETFLAGS: 293 return gfs2_get_flags(filp, (u32 __user *)arg); 294 case FS_IOC_SETFLAGS: 295 return gfs2_set_flags(filp, (u32 __user *)arg); 296 } 297 return -ENOTTY; 298 } 299 300 /** 301 * gfs2_allocate_page_backing - Use bmap to allocate blocks 302 * @page: The (locked) page to allocate backing for 303 * 304 * We try to allocate all the blocks required for the page in 305 * one go. This might fail for various reasons, so we keep 306 * trying until all the blocks to back this page are allocated. 307 * If some of the blocks are already allocated, thats ok too. 308 */ 309 310 static int gfs2_allocate_page_backing(struct page *page) 311 { 312 struct inode *inode = page->mapping->host; 313 struct buffer_head bh; 314 unsigned long size = PAGE_CACHE_SIZE; 315 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); 316 317 do { 318 bh.b_state = 0; 319 bh.b_size = size; 320 gfs2_block_map(inode, lblock, &bh, 1); 321 if (!buffer_mapped(&bh)) 322 return -EIO; 323 size -= bh.b_size; 324 lblock += (bh.b_size >> inode->i_blkbits); 325 } while(size > 0); 326 return 0; 327 } 328 329 /** 330 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable 331 * @vma: The virtual memory area 332 * @page: The page which is about to become writable 333 * 334 * When the page becomes writable, we need to ensure that we have 335 * blocks allocated on disk to back that page. 336 */ 337 338 static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 339 { 340 struct page *page = vmf->page; 341 struct inode *inode = vma->vm_file->f_path.dentry->d_inode; 342 struct gfs2_inode *ip = GFS2_I(inode); 343 struct gfs2_sbd *sdp = GFS2_SB(inode); 344 unsigned long last_index; 345 u64 pos = page->index << PAGE_CACHE_SHIFT; 346 unsigned int data_blocks, ind_blocks, rblocks; 347 int alloc_required = 0; 348 struct gfs2_holder gh; 349 struct gfs2_alloc *al; 350 int ret; 351 352 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 353 ret = gfs2_glock_nq(&gh); 354 if (ret) 355 goto out; 356 357 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); 358 set_bit(GIF_SW_PAGED, &ip->i_flags); 359 360 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); 361 if (ret || !alloc_required) 362 goto out_unlock; 363 ret = -ENOMEM; 364 al = gfs2_alloc_get(ip); 365 if (al == NULL) 366 goto out_unlock; 367 368 ret = gfs2_quota_lock_check(ip); 369 if (ret) 370 goto out_alloc_put; 371 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); 372 al->al_requested = data_blocks + ind_blocks; 373 ret = gfs2_inplace_reserve(ip); 374 if (ret) 375 goto out_quota_unlock; 376 377 rblocks = RES_DINODE + ind_blocks; 378 if (gfs2_is_jdata(ip)) 379 rblocks += data_blocks ? data_blocks : 1; 380 if (ind_blocks || data_blocks) 381 rblocks += RES_STATFS + RES_QUOTA; 382 ret = gfs2_trans_begin(sdp, rblocks, 0); 383 if (ret) 384 goto out_trans_fail; 385 386 lock_page(page); 387 ret = -EINVAL; 388 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; 389 if (page->index > last_index) 390 goto out_unlock_page; 391 ret = 0; 392 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) 393 goto out_unlock_page; 394 if (gfs2_is_stuffed(ip)) { 395 ret = gfs2_unstuff_dinode(ip, page); 396 if (ret) 397 goto out_unlock_page; 398 } 399 ret = gfs2_allocate_page_backing(page); 400 401 out_unlock_page: 402 unlock_page(page); 403 gfs2_trans_end(sdp); 404 out_trans_fail: 405 gfs2_inplace_release(ip); 406 out_quota_unlock: 407 gfs2_quota_unlock(ip); 408 out_alloc_put: 409 gfs2_alloc_put(ip); 410 out_unlock: 411 gfs2_glock_dq(&gh); 412 out: 413 gfs2_holder_uninit(&gh); 414 if (ret == -ENOMEM) 415 ret = VM_FAULT_OOM; 416 else if (ret) 417 ret = VM_FAULT_SIGBUS; 418 return ret; 419 } 420 421 static const struct vm_operations_struct gfs2_vm_ops = { 422 .fault = filemap_fault, 423 .page_mkwrite = gfs2_page_mkwrite, 424 }; 425 426 /** 427 * gfs2_mmap - 428 * @file: The file to map 429 * @vma: The VMA which described the mapping 430 * 431 * There is no need to get a lock here unless we should be updating 432 * atime. We ignore any locking errors since the only consequence is 433 * a missed atime update (which will just be deferred until later). 434 * 435 * Returns: 0 436 */ 437 438 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) 439 { 440 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 441 442 if (!(file->f_flags & O_NOATIME)) { 443 struct gfs2_holder i_gh; 444 int error; 445 446 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 447 error = gfs2_glock_nq(&i_gh); 448 file_accessed(file); 449 if (error == 0) 450 gfs2_glock_dq_uninit(&i_gh); 451 } 452 vma->vm_ops = &gfs2_vm_ops; 453 vma->vm_flags |= VM_CAN_NONLINEAR; 454 455 return 0; 456 } 457 458 /** 459 * gfs2_open - open a file 460 * @inode: the inode to open 461 * @file: the struct file for this opening 462 * 463 * Returns: errno 464 */ 465 466 static int gfs2_open(struct inode *inode, struct file *file) 467 { 468 struct gfs2_inode *ip = GFS2_I(inode); 469 struct gfs2_holder i_gh; 470 struct gfs2_file *fp; 471 int error; 472 473 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); 474 if (!fp) 475 return -ENOMEM; 476 477 mutex_init(&fp->f_fl_mutex); 478 479 gfs2_assert_warn(GFS2_SB(inode), !file->private_data); 480 file->private_data = fp; 481 482 if (S_ISREG(ip->i_inode.i_mode)) { 483 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, 484 &i_gh); 485 if (error) 486 goto fail; 487 488 if (!(file->f_flags & O_LARGEFILE) && 489 ip->i_disksize > MAX_NON_LFS) { 490 error = -EOVERFLOW; 491 goto fail_gunlock; 492 } 493 494 gfs2_glock_dq_uninit(&i_gh); 495 } 496 497 return 0; 498 499 fail_gunlock: 500 gfs2_glock_dq_uninit(&i_gh); 501 fail: 502 file->private_data = NULL; 503 kfree(fp); 504 return error; 505 } 506 507 /** 508 * gfs2_close - called to close a struct file 509 * @inode: the inode the struct file belongs to 510 * @file: the struct file being closed 511 * 512 * Returns: errno 513 */ 514 515 static int gfs2_close(struct inode *inode, struct file *file) 516 { 517 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 518 struct gfs2_file *fp; 519 520 fp = file->private_data; 521 file->private_data = NULL; 522 523 if (gfs2_assert_warn(sdp, fp)) 524 return -EIO; 525 526 kfree(fp); 527 528 return 0; 529 } 530 531 /** 532 * gfs2_fsync - sync the dirty data for a file (across the cluster) 533 * @file: the file that points to the dentry (we ignore this) 534 * @dentry: the dentry that points to the inode to sync 535 * 536 * The VFS will flush "normal" data for us. We only need to worry 537 * about metadata here. For journaled data, we just do a log flush 538 * as we can't avoid it. Otherwise we can just bale out if datasync 539 * is set. For stuffed inodes we must flush the log in order to 540 * ensure that all data is on disk. 541 * 542 * The call to write_inode_now() is there to write back metadata and 543 * the inode itself. It does also try and write the data, but thats 544 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() 545 * for us. 546 * 547 * Returns: errno 548 */ 549 550 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) 551 { 552 struct inode *inode = dentry->d_inode; 553 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); 554 int ret = 0; 555 556 if (gfs2_is_jdata(GFS2_I(inode))) { 557 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); 558 return 0; 559 } 560 561 if (sync_state != 0) { 562 if (!datasync) 563 ret = write_inode_now(inode, 0); 564 565 if (gfs2_is_stuffed(GFS2_I(inode))) 566 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); 567 } 568 569 return ret; 570 } 571 572 /** 573 * gfs2_file_aio_write - Perform a write to a file 574 * @iocb: The io context 575 * @iov: The data to write 576 * @nr_segs: Number of @iov segments 577 * @pos: The file position 578 * 579 * We have to do a lock/unlock here to refresh the inode size for 580 * O_APPEND writes, otherwise we can land up writing at the wrong 581 * offset. There is still a race, but provided the app is using its 582 * own file locking, this will make O_APPEND work as expected. 583 * 584 */ 585 586 static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, 587 unsigned long nr_segs, loff_t pos) 588 { 589 struct file *file = iocb->ki_filp; 590 591 if (file->f_flags & O_APPEND) { 592 struct dentry *dentry = file->f_dentry; 593 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 594 struct gfs2_holder gh; 595 int ret; 596 597 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 598 if (ret) 599 return ret; 600 gfs2_glock_dq_uninit(&gh); 601 } 602 603 return generic_file_aio_write(iocb, iov, nr_segs, pos); 604 } 605 606 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 607 608 /** 609 * gfs2_setlease - acquire/release a file lease 610 * @file: the file pointer 611 * @arg: lease type 612 * @fl: file lock 613 * 614 * We don't currently have a way to enforce a lease across the whole 615 * cluster; until we do, disable leases (by just returning -EINVAL), 616 * unless the administrator has requested purely local locking. 617 * 618 * Returns: errno 619 */ 620 621 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) 622 { 623 return -EINVAL; 624 } 625 626 /** 627 * gfs2_lock - acquire/release a posix lock on a file 628 * @file: the file pointer 629 * @cmd: either modify or retrieve lock state, possibly wait 630 * @fl: type and range of lock 631 * 632 * Returns: errno 633 */ 634 635 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) 636 { 637 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 638 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); 639 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 640 641 if (!(fl->fl_flags & FL_POSIX)) 642 return -ENOLCK; 643 if (__mandatory_lock(&ip->i_inode)) 644 return -ENOLCK; 645 646 if (cmd == F_CANCELLK) { 647 /* Hack: */ 648 cmd = F_SETLK; 649 fl->fl_type = F_UNLCK; 650 } 651 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 652 return -EIO; 653 if (IS_GETLK(cmd)) 654 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); 655 else if (fl->fl_type == F_UNLCK) 656 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); 657 else 658 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); 659 } 660 661 static int do_flock(struct file *file, int cmd, struct file_lock *fl) 662 { 663 struct gfs2_file *fp = file->private_data; 664 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 665 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); 666 struct gfs2_glock *gl; 667 unsigned int state; 668 int flags; 669 int error = 0; 670 671 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; 672 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; 673 674 mutex_lock(&fp->f_fl_mutex); 675 676 gl = fl_gh->gh_gl; 677 if (gl) { 678 if (fl_gh->gh_state == state) 679 goto out; 680 flock_lock_file_wait(file, 681 &(struct file_lock){.fl_type = F_UNLCK}); 682 gfs2_glock_dq_wait(fl_gh); 683 gfs2_holder_reinit(state, flags, fl_gh); 684 } else { 685 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, 686 &gfs2_flock_glops, CREATE, &gl); 687 if (error) 688 goto out; 689 gfs2_holder_init(gl, state, flags, fl_gh); 690 gfs2_glock_put(gl); 691 } 692 error = gfs2_glock_nq(fl_gh); 693 if (error) { 694 gfs2_holder_uninit(fl_gh); 695 if (error == GLR_TRYFAILED) 696 error = -EAGAIN; 697 } else { 698 error = flock_lock_file_wait(file, fl); 699 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 700 } 701 702 out: 703 mutex_unlock(&fp->f_fl_mutex); 704 return error; 705 } 706 707 static void do_unflock(struct file *file, struct file_lock *fl) 708 { 709 struct gfs2_file *fp = file->private_data; 710 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 711 712 mutex_lock(&fp->f_fl_mutex); 713 flock_lock_file_wait(file, fl); 714 if (fl_gh->gh_gl) 715 gfs2_glock_dq_uninit(fl_gh); 716 mutex_unlock(&fp->f_fl_mutex); 717 } 718 719 /** 720 * gfs2_flock - acquire/release a flock lock on a file 721 * @file: the file pointer 722 * @cmd: either modify or retrieve lock state, possibly wait 723 * @fl: type and range of lock 724 * 725 * Returns: errno 726 */ 727 728 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) 729 { 730 if (!(fl->fl_flags & FL_FLOCK)) 731 return -ENOLCK; 732 if (fl->fl_type & LOCK_MAND) 733 return -EOPNOTSUPP; 734 735 if (fl->fl_type == F_UNLCK) { 736 do_unflock(file, fl); 737 return 0; 738 } else { 739 return do_flock(file, cmd, fl); 740 } 741 } 742 743 const struct file_operations gfs2_file_fops = { 744 .llseek = gfs2_llseek, 745 .read = do_sync_read, 746 .aio_read = generic_file_aio_read, 747 .write = do_sync_write, 748 .aio_write = gfs2_file_aio_write, 749 .unlocked_ioctl = gfs2_ioctl, 750 .mmap = gfs2_mmap, 751 .open = gfs2_open, 752 .release = gfs2_close, 753 .fsync = gfs2_fsync, 754 .lock = gfs2_lock, 755 .flock = gfs2_flock, 756 .splice_read = generic_file_splice_read, 757 .splice_write = generic_file_splice_write, 758 .setlease = gfs2_setlease, 759 }; 760 761 const struct file_operations gfs2_dir_fops = { 762 .readdir = gfs2_readdir, 763 .unlocked_ioctl = gfs2_ioctl, 764 .open = gfs2_open, 765 .release = gfs2_close, 766 .fsync = gfs2_fsync, 767 .lock = gfs2_lock, 768 .flock = gfs2_flock, 769 }; 770 771 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ 772 773 const struct file_operations gfs2_file_fops_nolock = { 774 .llseek = gfs2_llseek, 775 .read = do_sync_read, 776 .aio_read = generic_file_aio_read, 777 .write = do_sync_write, 778 .aio_write = gfs2_file_aio_write, 779 .unlocked_ioctl = gfs2_ioctl, 780 .mmap = gfs2_mmap, 781 .open = gfs2_open, 782 .release = gfs2_close, 783 .fsync = gfs2_fsync, 784 .splice_read = generic_file_splice_read, 785 .splice_write = generic_file_splice_write, 786 .setlease = generic_setlease, 787 }; 788 789 const struct file_operations gfs2_dir_fops_nolock = { 790 .readdir = gfs2_readdir, 791 .unlocked_ioctl = gfs2_ioctl, 792 .open = gfs2_open, 793 .release = gfs2_close, 794 .fsync = gfs2_fsync, 795 }; 796 797