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