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/falloc.h> 23 #include <linux/swap.h> 24 #include <linux/crc32.h> 25 #include <linux/writeback.h> 26 #include <asm/uaccess.h> 27 #include <linux/dlm.h> 28 #include <linux/dlm_plock.h> 29 30 #include "gfs2.h" 31 #include "incore.h" 32 #include "bmap.h" 33 #include "dir.h" 34 #include "glock.h" 35 #include "glops.h" 36 #include "inode.h" 37 #include "log.h" 38 #include "meta_io.h" 39 #include "quota.h" 40 #include "rgrp.h" 41 #include "trans.h" 42 #include "util.h" 43 44 /** 45 * gfs2_llseek - seek to a location in a file 46 * @file: the file 47 * @offset: the offset 48 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) 49 * 50 * SEEK_END requires the glock for the file because it references the 51 * file's size. 52 * 53 * Returns: The new offset, or errno 54 */ 55 56 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) 57 { 58 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 59 struct gfs2_holder i_gh; 60 loff_t error; 61 62 switch (origin) { 63 case SEEK_END: /* These reference inode->i_size */ 64 case SEEK_DATA: 65 case SEEK_HOLE: 66 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, 67 &i_gh); 68 if (!error) { 69 error = generic_file_llseek(file, offset, origin); 70 gfs2_glock_dq_uninit(&i_gh); 71 } 72 break; 73 case SEEK_CUR: 74 case SEEK_SET: 75 error = generic_file_llseek(file, offset, origin); 76 break; 77 default: 78 error = -EINVAL; 79 } 80 81 return error; 82 } 83 84 /** 85 * gfs2_readdir - Read directory entries from a directory 86 * @file: The directory to read from 87 * @dirent: Buffer for dirents 88 * @filldir: Function used to do the copying 89 * 90 * Returns: errno 91 */ 92 93 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) 94 { 95 struct inode *dir = file->f_mapping->host; 96 struct gfs2_inode *dip = GFS2_I(dir); 97 struct gfs2_holder d_gh; 98 u64 offset = file->f_pos; 99 int error; 100 101 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 102 error = gfs2_glock_nq(&d_gh); 103 if (error) { 104 gfs2_holder_uninit(&d_gh); 105 return error; 106 } 107 108 error = gfs2_dir_read(dir, &offset, dirent, filldir); 109 110 gfs2_glock_dq_uninit(&d_gh); 111 112 file->f_pos = offset; 113 114 return error; 115 } 116 117 /** 118 * fsflags_cvt 119 * @table: A table of 32 u32 flags 120 * @val: a 32 bit value to convert 121 * 122 * This function can be used to convert between fsflags values and 123 * GFS2's own flags values. 124 * 125 * Returns: the converted flags 126 */ 127 static u32 fsflags_cvt(const u32 *table, u32 val) 128 { 129 u32 res = 0; 130 while(val) { 131 if (val & 1) 132 res |= *table; 133 table++; 134 val >>= 1; 135 } 136 return res; 137 } 138 139 static const u32 fsflags_to_gfs2[32] = { 140 [3] = GFS2_DIF_SYNC, 141 [4] = GFS2_DIF_IMMUTABLE, 142 [5] = GFS2_DIF_APPENDONLY, 143 [7] = GFS2_DIF_NOATIME, 144 [12] = GFS2_DIF_EXHASH, 145 [14] = GFS2_DIF_INHERIT_JDATA, 146 }; 147 148 static const u32 gfs2_to_fsflags[32] = { 149 [gfs2fl_Sync] = FS_SYNC_FL, 150 [gfs2fl_Immutable] = FS_IMMUTABLE_FL, 151 [gfs2fl_AppendOnly] = FS_APPEND_FL, 152 [gfs2fl_NoAtime] = FS_NOATIME_FL, 153 [gfs2fl_ExHash] = FS_INDEX_FL, 154 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, 155 }; 156 157 static int gfs2_get_flags(struct file *filp, u32 __user *ptr) 158 { 159 struct inode *inode = filp->f_path.dentry->d_inode; 160 struct gfs2_inode *ip = GFS2_I(inode); 161 struct gfs2_holder gh; 162 int error; 163 u32 fsflags; 164 165 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 166 error = gfs2_glock_nq(&gh); 167 if (error) 168 return error; 169 170 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); 171 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) 172 fsflags |= FS_JOURNAL_DATA_FL; 173 if (put_user(fsflags, ptr)) 174 error = -EFAULT; 175 176 gfs2_glock_dq(&gh); 177 gfs2_holder_uninit(&gh); 178 return error; 179 } 180 181 void gfs2_set_inode_flags(struct inode *inode) 182 { 183 struct gfs2_inode *ip = GFS2_I(inode); 184 unsigned int flags = inode->i_flags; 185 186 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC); 187 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode)) 188 inode->i_flags |= S_NOSEC; 189 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) 190 flags |= S_IMMUTABLE; 191 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) 192 flags |= S_APPEND; 193 if (ip->i_diskflags & GFS2_DIF_NOATIME) 194 flags |= S_NOATIME; 195 if (ip->i_diskflags & GFS2_DIF_SYNC) 196 flags |= S_SYNC; 197 inode->i_flags = flags; 198 } 199 200 /* Flags that can be set by user space */ 201 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ 202 GFS2_DIF_IMMUTABLE| \ 203 GFS2_DIF_APPENDONLY| \ 204 GFS2_DIF_NOATIME| \ 205 GFS2_DIF_SYNC| \ 206 GFS2_DIF_SYSTEM| \ 207 GFS2_DIF_INHERIT_JDATA) 208 209 /** 210 * gfs2_set_flags - set flags on an inode 211 * @inode: The inode 212 * @flags: The flags to set 213 * @mask: Indicates which flags are valid 214 * 215 */ 216 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) 217 { 218 struct inode *inode = filp->f_path.dentry->d_inode; 219 struct gfs2_inode *ip = GFS2_I(inode); 220 struct gfs2_sbd *sdp = GFS2_SB(inode); 221 struct buffer_head *bh; 222 struct gfs2_holder gh; 223 int error; 224 u32 new_flags, flags; 225 226 error = mnt_want_write(filp->f_path.mnt); 227 if (error) 228 return error; 229 230 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 231 if (error) 232 goto out_drop_write; 233 234 error = -EACCES; 235 if (!inode_owner_or_capable(inode)) 236 goto out; 237 238 error = 0; 239 flags = ip->i_diskflags; 240 new_flags = (flags & ~mask) | (reqflags & mask); 241 if ((new_flags ^ flags) == 0) 242 goto out; 243 244 error = -EINVAL; 245 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) 246 goto out; 247 248 error = -EPERM; 249 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) 250 goto out; 251 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) 252 goto out; 253 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && 254 !capable(CAP_LINUX_IMMUTABLE)) 255 goto out; 256 if (!IS_IMMUTABLE(inode)) { 257 error = gfs2_permission(inode, MAY_WRITE); 258 if (error) 259 goto out; 260 } 261 if ((flags ^ new_flags) & GFS2_DIF_JDATA) { 262 if (flags & GFS2_DIF_JDATA) 263 gfs2_log_flush(sdp, ip->i_gl); 264 error = filemap_fdatawrite(inode->i_mapping); 265 if (error) 266 goto out; 267 error = filemap_fdatawait(inode->i_mapping); 268 if (error) 269 goto out; 270 } 271 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 272 if (error) 273 goto out; 274 error = gfs2_meta_inode_buffer(ip, &bh); 275 if (error) 276 goto out_trans_end; 277 gfs2_trans_add_bh(ip->i_gl, bh, 1); 278 ip->i_diskflags = new_flags; 279 gfs2_dinode_out(ip, bh->b_data); 280 brelse(bh); 281 gfs2_set_inode_flags(inode); 282 gfs2_set_aops(inode); 283 out_trans_end: 284 gfs2_trans_end(sdp); 285 out: 286 gfs2_glock_dq_uninit(&gh); 287 out_drop_write: 288 mnt_drop_write(filp->f_path.mnt); 289 return error; 290 } 291 292 static int gfs2_set_flags(struct file *filp, u32 __user *ptr) 293 { 294 struct inode *inode = filp->f_path.dentry->d_inode; 295 u32 fsflags, gfsflags; 296 297 if (get_user(fsflags, ptr)) 298 return -EFAULT; 299 300 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); 301 if (!S_ISDIR(inode->i_mode)) { 302 if (gfsflags & GFS2_DIF_INHERIT_JDATA) 303 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); 304 return do_gfs2_set_flags(filp, gfsflags, ~0); 305 } 306 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); 307 } 308 309 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 310 { 311 switch(cmd) { 312 case FS_IOC_GETFLAGS: 313 return gfs2_get_flags(filp, (u32 __user *)arg); 314 case FS_IOC_SETFLAGS: 315 return gfs2_set_flags(filp, (u32 __user *)arg); 316 } 317 return -ENOTTY; 318 } 319 320 /** 321 * gfs2_allocate_page_backing - Use bmap to allocate blocks 322 * @page: The (locked) page to allocate backing for 323 * 324 * We try to allocate all the blocks required for the page in 325 * one go. This might fail for various reasons, so we keep 326 * trying until all the blocks to back this page are allocated. 327 * If some of the blocks are already allocated, thats ok too. 328 */ 329 330 static int gfs2_allocate_page_backing(struct page *page) 331 { 332 struct inode *inode = page->mapping->host; 333 struct buffer_head bh; 334 unsigned long size = PAGE_CACHE_SIZE; 335 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); 336 337 do { 338 bh.b_state = 0; 339 bh.b_size = size; 340 gfs2_block_map(inode, lblock, &bh, 1); 341 if (!buffer_mapped(&bh)) 342 return -EIO; 343 size -= bh.b_size; 344 lblock += (bh.b_size >> inode->i_blkbits); 345 } while(size > 0); 346 return 0; 347 } 348 349 /** 350 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable 351 * @vma: The virtual memory area 352 * @page: The page which is about to become writable 353 * 354 * When the page becomes writable, we need to ensure that we have 355 * blocks allocated on disk to back that page. 356 */ 357 358 static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 359 { 360 struct page *page = vmf->page; 361 struct inode *inode = vma->vm_file->f_path.dentry->d_inode; 362 struct gfs2_inode *ip = GFS2_I(inode); 363 struct gfs2_sbd *sdp = GFS2_SB(inode); 364 unsigned long last_index; 365 u64 pos = page->index << PAGE_CACHE_SHIFT; 366 unsigned int data_blocks, ind_blocks, rblocks; 367 struct gfs2_holder gh; 368 struct gfs2_alloc *al; 369 loff_t size; 370 int ret; 371 372 /* Wait if fs is frozen. This is racy so we check again later on 373 * and retry if the fs has been frozen after the page lock has 374 * been acquired 375 */ 376 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); 377 378 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 379 ret = gfs2_glock_nq(&gh); 380 if (ret) 381 goto out; 382 383 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); 384 set_bit(GIF_SW_PAGED, &ip->i_flags); 385 386 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) { 387 lock_page(page); 388 if (!PageUptodate(page) || page->mapping != inode->i_mapping) { 389 ret = -EAGAIN; 390 unlock_page(page); 391 } 392 goto out_unlock; 393 } 394 395 ret = -ENOMEM; 396 al = gfs2_alloc_get(ip); 397 if (al == NULL) 398 goto out_unlock; 399 400 ret = gfs2_quota_lock_check(ip); 401 if (ret) 402 goto out_alloc_put; 403 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); 404 al->al_requested = data_blocks + ind_blocks; 405 ret = gfs2_inplace_reserve(ip); 406 if (ret) 407 goto out_quota_unlock; 408 409 rblocks = RES_DINODE + ind_blocks; 410 if (gfs2_is_jdata(ip)) 411 rblocks += data_blocks ? data_blocks : 1; 412 if (ind_blocks || data_blocks) { 413 rblocks += RES_STATFS + RES_QUOTA; 414 rblocks += gfs2_rg_blocks(ip); 415 } 416 ret = gfs2_trans_begin(sdp, rblocks, 0); 417 if (ret) 418 goto out_trans_fail; 419 420 lock_page(page); 421 ret = -EINVAL; 422 size = i_size_read(inode); 423 last_index = (size - 1) >> PAGE_CACHE_SHIFT; 424 /* Check page index against inode size */ 425 if (size == 0 || (page->index > last_index)) 426 goto out_trans_end; 427 428 ret = -EAGAIN; 429 /* If truncated, we must retry the operation, we may have raced 430 * with the glock demotion code. 431 */ 432 if (!PageUptodate(page) || page->mapping != inode->i_mapping) 433 goto out_trans_end; 434 435 /* Unstuff, if required, and allocate backing blocks for page */ 436 ret = 0; 437 if (gfs2_is_stuffed(ip)) 438 ret = gfs2_unstuff_dinode(ip, page); 439 if (ret == 0) 440 ret = gfs2_allocate_page_backing(page); 441 442 out_trans_end: 443 if (ret) 444 unlock_page(page); 445 gfs2_trans_end(sdp); 446 out_trans_fail: 447 gfs2_inplace_release(ip); 448 out_quota_unlock: 449 gfs2_quota_unlock(ip); 450 out_alloc_put: 451 gfs2_alloc_put(ip); 452 out_unlock: 453 gfs2_glock_dq(&gh); 454 out: 455 gfs2_holder_uninit(&gh); 456 if (ret == 0) { 457 set_page_dirty(page); 458 /* This check must be post dropping of transaction lock */ 459 if (inode->i_sb->s_frozen == SB_UNFROZEN) { 460 wait_on_page_writeback(page); 461 } else { 462 ret = -EAGAIN; 463 unlock_page(page); 464 } 465 } 466 return block_page_mkwrite_return(ret); 467 } 468 469 static const struct vm_operations_struct gfs2_vm_ops = { 470 .fault = filemap_fault, 471 .page_mkwrite = gfs2_page_mkwrite, 472 }; 473 474 /** 475 * gfs2_mmap - 476 * @file: The file to map 477 * @vma: The VMA which described the mapping 478 * 479 * There is no need to get a lock here unless we should be updating 480 * atime. We ignore any locking errors since the only consequence is 481 * a missed atime update (which will just be deferred until later). 482 * 483 * Returns: 0 484 */ 485 486 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) 487 { 488 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 489 490 if (!(file->f_flags & O_NOATIME) && 491 !IS_NOATIME(&ip->i_inode)) { 492 struct gfs2_holder i_gh; 493 int error; 494 495 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 496 error = gfs2_glock_nq(&i_gh); 497 if (error == 0) { 498 file_accessed(file); 499 gfs2_glock_dq(&i_gh); 500 } 501 gfs2_holder_uninit(&i_gh); 502 if (error) 503 return error; 504 } 505 vma->vm_ops = &gfs2_vm_ops; 506 vma->vm_flags |= VM_CAN_NONLINEAR; 507 508 return 0; 509 } 510 511 /** 512 * gfs2_open - open a file 513 * @inode: the inode to open 514 * @file: the struct file for this opening 515 * 516 * Returns: errno 517 */ 518 519 static int gfs2_open(struct inode *inode, struct file *file) 520 { 521 struct gfs2_inode *ip = GFS2_I(inode); 522 struct gfs2_holder i_gh; 523 struct gfs2_file *fp; 524 int error; 525 526 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); 527 if (!fp) 528 return -ENOMEM; 529 530 mutex_init(&fp->f_fl_mutex); 531 532 gfs2_assert_warn(GFS2_SB(inode), !file->private_data); 533 file->private_data = fp; 534 535 if (S_ISREG(ip->i_inode.i_mode)) { 536 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, 537 &i_gh); 538 if (error) 539 goto fail; 540 541 if (!(file->f_flags & O_LARGEFILE) && 542 i_size_read(inode) > MAX_NON_LFS) { 543 error = -EOVERFLOW; 544 goto fail_gunlock; 545 } 546 547 gfs2_glock_dq_uninit(&i_gh); 548 } 549 550 return 0; 551 552 fail_gunlock: 553 gfs2_glock_dq_uninit(&i_gh); 554 fail: 555 file->private_data = NULL; 556 kfree(fp); 557 return error; 558 } 559 560 /** 561 * gfs2_close - called to close a struct file 562 * @inode: the inode the struct file belongs to 563 * @file: the struct file being closed 564 * 565 * Returns: errno 566 */ 567 568 static int gfs2_close(struct inode *inode, struct file *file) 569 { 570 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 571 struct gfs2_file *fp; 572 573 fp = file->private_data; 574 file->private_data = NULL; 575 576 if (gfs2_assert_warn(sdp, fp)) 577 return -EIO; 578 579 kfree(fp); 580 581 return 0; 582 } 583 584 /** 585 * gfs2_fsync - sync the dirty data for a file (across the cluster) 586 * @file: the file that points to the dentry 587 * @start: the start position in the file to sync 588 * @end: the end position in the file to sync 589 * @datasync: set if we can ignore timestamp changes 590 * 591 * We split the data flushing here so that we don't wait for the data 592 * until after we've also sent the metadata to disk. Note that for 593 * data=ordered, we will write & wait for the data at the log flush 594 * stage anyway, so this is unlikely to make much of a difference 595 * except in the data=writeback case. 596 * 597 * If the fdatawrite fails due to any reason except -EIO, we will 598 * continue the remainder of the fsync, although we'll still report 599 * the error at the end. This is to match filemap_write_and_wait_range() 600 * behaviour. 601 * 602 * Returns: errno 603 */ 604 605 static int gfs2_fsync(struct file *file, loff_t start, loff_t end, 606 int datasync) 607 { 608 struct address_space *mapping = file->f_mapping; 609 struct inode *inode = mapping->host; 610 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); 611 struct gfs2_inode *ip = GFS2_I(inode); 612 int ret, ret1 = 0; 613 614 if (mapping->nrpages) { 615 ret1 = filemap_fdatawrite_range(mapping, start, end); 616 if (ret1 == -EIO) 617 return ret1; 618 } 619 620 if (datasync) 621 sync_state &= ~I_DIRTY_SYNC; 622 623 if (sync_state) { 624 ret = sync_inode_metadata(inode, 1); 625 if (ret) 626 return ret; 627 if (gfs2_is_jdata(ip)) 628 filemap_write_and_wait(mapping); 629 gfs2_ail_flush(ip->i_gl, 1); 630 } 631 632 if (mapping->nrpages) 633 ret = filemap_fdatawait_range(mapping, start, end); 634 635 return ret ? ret : ret1; 636 } 637 638 /** 639 * gfs2_file_aio_write - Perform a write to a file 640 * @iocb: The io context 641 * @iov: The data to write 642 * @nr_segs: Number of @iov segments 643 * @pos: The file position 644 * 645 * We have to do a lock/unlock here to refresh the inode size for 646 * O_APPEND writes, otherwise we can land up writing at the wrong 647 * offset. There is still a race, but provided the app is using its 648 * own file locking, this will make O_APPEND work as expected. 649 * 650 */ 651 652 static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, 653 unsigned long nr_segs, loff_t pos) 654 { 655 struct file *file = iocb->ki_filp; 656 657 if (file->f_flags & O_APPEND) { 658 struct dentry *dentry = file->f_dentry; 659 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 660 struct gfs2_holder gh; 661 int ret; 662 663 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 664 if (ret) 665 return ret; 666 gfs2_glock_dq_uninit(&gh); 667 } 668 669 return generic_file_aio_write(iocb, iov, nr_segs, pos); 670 } 671 672 static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, 673 int mode) 674 { 675 struct gfs2_inode *ip = GFS2_I(inode); 676 struct buffer_head *dibh; 677 int error; 678 unsigned int nr_blks; 679 sector_t lblock = offset >> inode->i_blkbits; 680 681 error = gfs2_meta_inode_buffer(ip, &dibh); 682 if (unlikely(error)) 683 return error; 684 685 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 686 687 if (gfs2_is_stuffed(ip)) { 688 error = gfs2_unstuff_dinode(ip, NULL); 689 if (unlikely(error)) 690 goto out; 691 } 692 693 while (len) { 694 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 695 bh_map.b_size = len; 696 set_buffer_zeronew(&bh_map); 697 698 error = gfs2_block_map(inode, lblock, &bh_map, 1); 699 if (unlikely(error)) 700 goto out; 701 len -= bh_map.b_size; 702 nr_blks = bh_map.b_size >> inode->i_blkbits; 703 lblock += nr_blks; 704 if (!buffer_new(&bh_map)) 705 continue; 706 if (unlikely(!buffer_zeronew(&bh_map))) { 707 error = -EIO; 708 goto out; 709 } 710 } 711 if (offset + len > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE)) 712 i_size_write(inode, offset + len); 713 714 mark_inode_dirty(inode); 715 716 out: 717 brelse(dibh); 718 return error; 719 } 720 721 static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len, 722 unsigned int *data_blocks, unsigned int *ind_blocks) 723 { 724 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 725 unsigned int max_blocks = ip->i_rgd->rd_free_clone; 726 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); 727 728 for (tmp = max_data; tmp > sdp->sd_diptrs;) { 729 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); 730 max_data -= tmp; 731 } 732 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve, 733 so it might end up with fewer data blocks */ 734 if (max_data <= *data_blocks) 735 return; 736 *data_blocks = max_data; 737 *ind_blocks = max_blocks - max_data; 738 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; 739 if (*len > max) { 740 *len = max; 741 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); 742 } 743 } 744 745 static long gfs2_fallocate(struct file *file, int mode, loff_t offset, 746 loff_t len) 747 { 748 struct inode *inode = file->f_path.dentry->d_inode; 749 struct gfs2_sbd *sdp = GFS2_SB(inode); 750 struct gfs2_inode *ip = GFS2_I(inode); 751 unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 752 loff_t bytes, max_bytes; 753 struct gfs2_alloc *al; 754 int error; 755 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); 756 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; 757 loff_t max_chunk_size = UINT_MAX & bsize_mask; 758 next = (next + 1) << sdp->sd_sb.sb_bsize_shift; 759 760 /* We only support the FALLOC_FL_KEEP_SIZE mode */ 761 if (mode & ~FALLOC_FL_KEEP_SIZE) 762 return -EOPNOTSUPP; 763 764 offset &= bsize_mask; 765 766 len = next - offset; 767 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; 768 if (!bytes) 769 bytes = UINT_MAX; 770 bytes &= bsize_mask; 771 if (bytes == 0) 772 bytes = sdp->sd_sb.sb_bsize; 773 774 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 775 error = gfs2_glock_nq(&ip->i_gh); 776 if (unlikely(error)) 777 goto out_uninit; 778 779 if (!gfs2_write_alloc_required(ip, offset, len)) 780 goto out_unlock; 781 782 while (len > 0) { 783 if (len < bytes) 784 bytes = len; 785 al = gfs2_alloc_get(ip); 786 if (!al) { 787 error = -ENOMEM; 788 goto out_unlock; 789 } 790 791 error = gfs2_quota_lock_check(ip); 792 if (error) 793 goto out_alloc_put; 794 795 retry: 796 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); 797 798 al->al_requested = data_blocks + ind_blocks; 799 error = gfs2_inplace_reserve(ip); 800 if (error) { 801 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) { 802 bytes >>= 1; 803 bytes &= bsize_mask; 804 if (bytes == 0) 805 bytes = sdp->sd_sb.sb_bsize; 806 goto retry; 807 } 808 goto out_qunlock; 809 } 810 max_bytes = bytes; 811 calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len, 812 &max_bytes, &data_blocks, &ind_blocks); 813 al->al_requested = data_blocks + ind_blocks; 814 815 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + 816 RES_RG_HDR + gfs2_rg_blocks(ip); 817 if (gfs2_is_jdata(ip)) 818 rblocks += data_blocks ? data_blocks : 1; 819 820 error = gfs2_trans_begin(sdp, rblocks, 821 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); 822 if (error) 823 goto out_trans_fail; 824 825 error = fallocate_chunk(inode, offset, max_bytes, mode); 826 gfs2_trans_end(sdp); 827 828 if (error) 829 goto out_trans_fail; 830 831 len -= max_bytes; 832 offset += max_bytes; 833 gfs2_inplace_release(ip); 834 gfs2_quota_unlock(ip); 835 gfs2_alloc_put(ip); 836 } 837 goto out_unlock; 838 839 out_trans_fail: 840 gfs2_inplace_release(ip); 841 out_qunlock: 842 gfs2_quota_unlock(ip); 843 out_alloc_put: 844 gfs2_alloc_put(ip); 845 out_unlock: 846 gfs2_glock_dq(&ip->i_gh); 847 out_uninit: 848 gfs2_holder_uninit(&ip->i_gh); 849 return error; 850 } 851 852 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 853 854 /** 855 * gfs2_setlease - acquire/release a file lease 856 * @file: the file pointer 857 * @arg: lease type 858 * @fl: file lock 859 * 860 * We don't currently have a way to enforce a lease across the whole 861 * cluster; until we do, disable leases (by just returning -EINVAL), 862 * unless the administrator has requested purely local locking. 863 * 864 * Locking: called under lock_flocks 865 * 866 * Returns: errno 867 */ 868 869 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) 870 { 871 return -EINVAL; 872 } 873 874 /** 875 * gfs2_lock - acquire/release a posix lock on a file 876 * @file: the file pointer 877 * @cmd: either modify or retrieve lock state, possibly wait 878 * @fl: type and range of lock 879 * 880 * Returns: errno 881 */ 882 883 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) 884 { 885 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 886 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); 887 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 888 889 if (!(fl->fl_flags & FL_POSIX)) 890 return -ENOLCK; 891 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) 892 return -ENOLCK; 893 894 if (cmd == F_CANCELLK) { 895 /* Hack: */ 896 cmd = F_SETLK; 897 fl->fl_type = F_UNLCK; 898 } 899 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 900 return -EIO; 901 if (IS_GETLK(cmd)) 902 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); 903 else if (fl->fl_type == F_UNLCK) 904 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); 905 else 906 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); 907 } 908 909 static int do_flock(struct file *file, int cmd, struct file_lock *fl) 910 { 911 struct gfs2_file *fp = file->private_data; 912 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 913 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); 914 struct gfs2_glock *gl; 915 unsigned int state; 916 int flags; 917 int error = 0; 918 919 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; 920 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; 921 922 mutex_lock(&fp->f_fl_mutex); 923 924 gl = fl_gh->gh_gl; 925 if (gl) { 926 if (fl_gh->gh_state == state) 927 goto out; 928 flock_lock_file_wait(file, 929 &(struct file_lock){.fl_type = F_UNLCK}); 930 gfs2_glock_dq_wait(fl_gh); 931 gfs2_holder_reinit(state, flags, fl_gh); 932 } else { 933 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, 934 &gfs2_flock_glops, CREATE, &gl); 935 if (error) 936 goto out; 937 gfs2_holder_init(gl, state, flags, fl_gh); 938 gfs2_glock_put(gl); 939 } 940 error = gfs2_glock_nq(fl_gh); 941 if (error) { 942 gfs2_holder_uninit(fl_gh); 943 if (error == GLR_TRYFAILED) 944 error = -EAGAIN; 945 } else { 946 error = flock_lock_file_wait(file, fl); 947 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 948 } 949 950 out: 951 mutex_unlock(&fp->f_fl_mutex); 952 return error; 953 } 954 955 static void do_unflock(struct file *file, struct file_lock *fl) 956 { 957 struct gfs2_file *fp = file->private_data; 958 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 959 960 mutex_lock(&fp->f_fl_mutex); 961 flock_lock_file_wait(file, fl); 962 if (fl_gh->gh_gl) { 963 gfs2_glock_dq_wait(fl_gh); 964 gfs2_holder_uninit(fl_gh); 965 } 966 mutex_unlock(&fp->f_fl_mutex); 967 } 968 969 /** 970 * gfs2_flock - acquire/release a flock lock on a file 971 * @file: the file pointer 972 * @cmd: either modify or retrieve lock state, possibly wait 973 * @fl: type and range of lock 974 * 975 * Returns: errno 976 */ 977 978 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) 979 { 980 if (!(fl->fl_flags & FL_FLOCK)) 981 return -ENOLCK; 982 if (fl->fl_type & LOCK_MAND) 983 return -EOPNOTSUPP; 984 985 if (fl->fl_type == F_UNLCK) { 986 do_unflock(file, fl); 987 return 0; 988 } else { 989 return do_flock(file, cmd, fl); 990 } 991 } 992 993 const struct file_operations gfs2_file_fops = { 994 .llseek = gfs2_llseek, 995 .read = do_sync_read, 996 .aio_read = generic_file_aio_read, 997 .write = do_sync_write, 998 .aio_write = gfs2_file_aio_write, 999 .unlocked_ioctl = gfs2_ioctl, 1000 .mmap = gfs2_mmap, 1001 .open = gfs2_open, 1002 .release = gfs2_close, 1003 .fsync = gfs2_fsync, 1004 .lock = gfs2_lock, 1005 .flock = gfs2_flock, 1006 .splice_read = generic_file_splice_read, 1007 .splice_write = generic_file_splice_write, 1008 .setlease = gfs2_setlease, 1009 .fallocate = gfs2_fallocate, 1010 }; 1011 1012 const struct file_operations gfs2_dir_fops = { 1013 .readdir = gfs2_readdir, 1014 .unlocked_ioctl = gfs2_ioctl, 1015 .open = gfs2_open, 1016 .release = gfs2_close, 1017 .fsync = gfs2_fsync, 1018 .lock = gfs2_lock, 1019 .flock = gfs2_flock, 1020 .llseek = default_llseek, 1021 }; 1022 1023 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ 1024 1025 const struct file_operations gfs2_file_fops_nolock = { 1026 .llseek = gfs2_llseek, 1027 .read = do_sync_read, 1028 .aio_read = generic_file_aio_read, 1029 .write = do_sync_write, 1030 .aio_write = gfs2_file_aio_write, 1031 .unlocked_ioctl = gfs2_ioctl, 1032 .mmap = gfs2_mmap, 1033 .open = gfs2_open, 1034 .release = gfs2_close, 1035 .fsync = gfs2_fsync, 1036 .splice_read = generic_file_splice_read, 1037 .splice_write = generic_file_splice_write, 1038 .setlease = generic_setlease, 1039 .fallocate = gfs2_fallocate, 1040 }; 1041 1042 const struct file_operations gfs2_dir_fops_nolock = { 1043 .readdir = gfs2_readdir, 1044 .unlocked_ioctl = gfs2_ioctl, 1045 .open = gfs2_open, 1046 .release = gfs2_close, 1047 .fsync = gfs2_fsync, 1048 .llseek = default_llseek, 1049 }; 1050 1051