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, &file->f_ra); 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_file(filp); 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_file(filp); 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 case FITRIM: 317 return gfs2_fitrim(filp, (void __user *)arg); 318 } 319 return -ENOTTY; 320 } 321 322 /** 323 * gfs2_allocate_page_backing - Use bmap to allocate blocks 324 * @page: The (locked) page to allocate backing for 325 * 326 * We try to allocate all the blocks required for the page in 327 * one go. This might fail for various reasons, so we keep 328 * trying until all the blocks to back this page are allocated. 329 * If some of the blocks are already allocated, thats ok too. 330 */ 331 332 static int gfs2_allocate_page_backing(struct page *page) 333 { 334 struct inode *inode = page->mapping->host; 335 struct buffer_head bh; 336 unsigned long size = PAGE_CACHE_SIZE; 337 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); 338 339 do { 340 bh.b_state = 0; 341 bh.b_size = size; 342 gfs2_block_map(inode, lblock, &bh, 1); 343 if (!buffer_mapped(&bh)) 344 return -EIO; 345 size -= bh.b_size; 346 lblock += (bh.b_size >> inode->i_blkbits); 347 } while(size > 0); 348 return 0; 349 } 350 351 /** 352 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable 353 * @vma: The virtual memory area 354 * @page: The page which is about to become writable 355 * 356 * When the page becomes writable, we need to ensure that we have 357 * blocks allocated on disk to back that page. 358 */ 359 360 static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 361 { 362 struct page *page = vmf->page; 363 struct inode *inode = vma->vm_file->f_path.dentry->d_inode; 364 struct gfs2_inode *ip = GFS2_I(inode); 365 struct gfs2_sbd *sdp = GFS2_SB(inode); 366 unsigned long last_index; 367 u64 pos = page->index << PAGE_CACHE_SHIFT; 368 unsigned int data_blocks, ind_blocks, rblocks; 369 struct gfs2_holder gh; 370 struct gfs2_qadata *qa; 371 loff_t size; 372 int ret; 373 374 /* Wait if fs is frozen. This is racy so we check again later on 375 * and retry if the fs has been frozen after the page lock has 376 * been acquired 377 */ 378 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); 379 380 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 381 ret = gfs2_glock_nq(&gh); 382 if (ret) 383 goto out; 384 385 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); 386 set_bit(GIF_SW_PAGED, &ip->i_flags); 387 388 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) { 389 lock_page(page); 390 if (!PageUptodate(page) || page->mapping != inode->i_mapping) { 391 ret = -EAGAIN; 392 unlock_page(page); 393 } 394 goto out_unlock; 395 } 396 397 ret = -ENOMEM; 398 qa = gfs2_qadata_get(ip); 399 if (qa == NULL) 400 goto out_unlock; 401 402 ret = gfs2_quota_lock_check(ip); 403 if (ret) 404 goto out_alloc_put; 405 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); 406 ret = gfs2_inplace_reserve(ip, data_blocks + ind_blocks); 407 if (ret) 408 goto out_quota_unlock; 409 410 rblocks = RES_DINODE + ind_blocks; 411 if (gfs2_is_jdata(ip)) 412 rblocks += data_blocks ? data_blocks : 1; 413 if (ind_blocks || data_blocks) { 414 rblocks += RES_STATFS + RES_QUOTA; 415 rblocks += gfs2_rg_blocks(ip); 416 } 417 ret = gfs2_trans_begin(sdp, rblocks, 0); 418 if (ret) 419 goto out_trans_fail; 420 421 lock_page(page); 422 ret = -EINVAL; 423 size = i_size_read(inode); 424 last_index = (size - 1) >> PAGE_CACHE_SHIFT; 425 /* Check page index against inode size */ 426 if (size == 0 || (page->index > last_index)) 427 goto out_trans_end; 428 429 ret = -EAGAIN; 430 /* If truncated, we must retry the operation, we may have raced 431 * with the glock demotion code. 432 */ 433 if (!PageUptodate(page) || page->mapping != inode->i_mapping) 434 goto out_trans_end; 435 436 /* Unstuff, if required, and allocate backing blocks for page */ 437 ret = 0; 438 if (gfs2_is_stuffed(ip)) 439 ret = gfs2_unstuff_dinode(ip, page); 440 if (ret == 0) 441 ret = gfs2_allocate_page_backing(page); 442 443 out_trans_end: 444 if (ret) 445 unlock_page(page); 446 gfs2_trans_end(sdp); 447 out_trans_fail: 448 gfs2_inplace_release(ip); 449 out_quota_unlock: 450 gfs2_quota_unlock(ip); 451 out_alloc_put: 452 gfs2_qadata_put(ip); 453 out_unlock: 454 gfs2_glock_dq(&gh); 455 out: 456 gfs2_holder_uninit(&gh); 457 if (ret == 0) { 458 set_page_dirty(page); 459 /* This check must be post dropping of transaction lock */ 460 if (inode->i_sb->s_frozen == SB_UNFROZEN) { 461 wait_on_page_writeback(page); 462 } else { 463 ret = -EAGAIN; 464 unlock_page(page); 465 } 466 } 467 return block_page_mkwrite_return(ret); 468 } 469 470 static const struct vm_operations_struct gfs2_vm_ops = { 471 .fault = filemap_fault, 472 .page_mkwrite = gfs2_page_mkwrite, 473 }; 474 475 /** 476 * gfs2_mmap - 477 * @file: The file to map 478 * @vma: The VMA which described the mapping 479 * 480 * There is no need to get a lock here unless we should be updating 481 * atime. We ignore any locking errors since the only consequence is 482 * a missed atime update (which will just be deferred until later). 483 * 484 * Returns: 0 485 */ 486 487 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) 488 { 489 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 490 491 if (!(file->f_flags & O_NOATIME) && 492 !IS_NOATIME(&ip->i_inode)) { 493 struct gfs2_holder i_gh; 494 int error; 495 496 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); 497 error = gfs2_glock_nq(&i_gh); 498 if (error == 0) { 499 file_accessed(file); 500 gfs2_glock_dq(&i_gh); 501 } 502 gfs2_holder_uninit(&i_gh); 503 if (error) 504 return error; 505 } 506 vma->vm_ops = &gfs2_vm_ops; 507 vma->vm_flags |= VM_CAN_NONLINEAR; 508 509 return 0; 510 } 511 512 /** 513 * gfs2_open - open a file 514 * @inode: the inode to open 515 * @file: the struct file for this opening 516 * 517 * Returns: errno 518 */ 519 520 static int gfs2_open(struct inode *inode, struct file *file) 521 { 522 struct gfs2_inode *ip = GFS2_I(inode); 523 struct gfs2_holder i_gh; 524 struct gfs2_file *fp; 525 int error; 526 527 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); 528 if (!fp) 529 return -ENOMEM; 530 531 mutex_init(&fp->f_fl_mutex); 532 533 gfs2_assert_warn(GFS2_SB(inode), !file->private_data); 534 file->private_data = fp; 535 536 if (S_ISREG(ip->i_inode.i_mode)) { 537 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, 538 &i_gh); 539 if (error) 540 goto fail; 541 542 if (!(file->f_flags & O_LARGEFILE) && 543 i_size_read(inode) > MAX_NON_LFS) { 544 error = -EOVERFLOW; 545 goto fail_gunlock; 546 } 547 548 gfs2_glock_dq_uninit(&i_gh); 549 } 550 551 return 0; 552 553 fail_gunlock: 554 gfs2_glock_dq_uninit(&i_gh); 555 fail: 556 file->private_data = NULL; 557 kfree(fp); 558 return error; 559 } 560 561 /** 562 * gfs2_close - called to close a struct file 563 * @inode: the inode the struct file belongs to 564 * @file: the struct file being closed 565 * 566 * Returns: errno 567 */ 568 569 static int gfs2_close(struct inode *inode, struct file *file) 570 { 571 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; 572 struct gfs2_file *fp; 573 574 fp = file->private_data; 575 file->private_data = NULL; 576 577 if (gfs2_assert_warn(sdp, fp)) 578 return -EIO; 579 580 kfree(fp); 581 582 return 0; 583 } 584 585 /** 586 * gfs2_fsync - sync the dirty data for a file (across the cluster) 587 * @file: the file that points to the dentry 588 * @start: the start position in the file to sync 589 * @end: the end position in the file to sync 590 * @datasync: set if we can ignore timestamp changes 591 * 592 * We split the data flushing here so that we don't wait for the data 593 * until after we've also sent the metadata to disk. Note that for 594 * data=ordered, we will write & wait for the data at the log flush 595 * stage anyway, so this is unlikely to make much of a difference 596 * except in the data=writeback case. 597 * 598 * If the fdatawrite fails due to any reason except -EIO, we will 599 * continue the remainder of the fsync, although we'll still report 600 * the error at the end. This is to match filemap_write_and_wait_range() 601 * behaviour. 602 * 603 * Returns: errno 604 */ 605 606 static int gfs2_fsync(struct file *file, loff_t start, loff_t end, 607 int datasync) 608 { 609 struct address_space *mapping = file->f_mapping; 610 struct inode *inode = mapping->host; 611 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); 612 struct gfs2_inode *ip = GFS2_I(inode); 613 int ret = 0, ret1 = 0; 614 615 if (mapping->nrpages) { 616 ret1 = filemap_fdatawrite_range(mapping, start, end); 617 if (ret1 == -EIO) 618 return ret1; 619 } 620 621 if (datasync) 622 sync_state &= ~I_DIRTY_SYNC; 623 624 if (sync_state) { 625 ret = sync_inode_metadata(inode, 1); 626 if (ret) 627 return ret; 628 if (gfs2_is_jdata(ip)) 629 filemap_write_and_wait(mapping); 630 gfs2_ail_flush(ip->i_gl, 1); 631 } 632 633 if (mapping->nrpages) 634 ret = filemap_fdatawait_range(mapping, start, end); 635 636 return ret ? ret : ret1; 637 } 638 639 /** 640 * gfs2_file_aio_write - Perform a write to a file 641 * @iocb: The io context 642 * @iov: The data to write 643 * @nr_segs: Number of @iov segments 644 * @pos: The file position 645 * 646 * We have to do a lock/unlock here to refresh the inode size for 647 * O_APPEND writes, otherwise we can land up writing at the wrong 648 * offset. There is still a race, but provided the app is using its 649 * own file locking, this will make O_APPEND work as expected. 650 * 651 */ 652 653 static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, 654 unsigned long nr_segs, loff_t pos) 655 { 656 struct file *file = iocb->ki_filp; 657 658 if (file->f_flags & O_APPEND) { 659 struct dentry *dentry = file->f_dentry; 660 struct gfs2_inode *ip = GFS2_I(dentry->d_inode); 661 struct gfs2_holder gh; 662 int ret; 663 664 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 665 if (ret) 666 return ret; 667 gfs2_glock_dq_uninit(&gh); 668 } 669 670 return generic_file_aio_write(iocb, iov, nr_segs, pos); 671 } 672 673 static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, 674 int mode) 675 { 676 struct gfs2_inode *ip = GFS2_I(inode); 677 struct buffer_head *dibh; 678 int error; 679 loff_t size = len; 680 unsigned int nr_blks; 681 sector_t lblock = offset >> inode->i_blkbits; 682 683 error = gfs2_meta_inode_buffer(ip, &dibh); 684 if (unlikely(error)) 685 return error; 686 687 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 688 689 if (gfs2_is_stuffed(ip)) { 690 error = gfs2_unstuff_dinode(ip, NULL); 691 if (unlikely(error)) 692 goto out; 693 } 694 695 while (len) { 696 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 697 bh_map.b_size = len; 698 set_buffer_zeronew(&bh_map); 699 700 error = gfs2_block_map(inode, lblock, &bh_map, 1); 701 if (unlikely(error)) 702 goto out; 703 len -= bh_map.b_size; 704 nr_blks = bh_map.b_size >> inode->i_blkbits; 705 lblock += nr_blks; 706 if (!buffer_new(&bh_map)) 707 continue; 708 if (unlikely(!buffer_zeronew(&bh_map))) { 709 error = -EIO; 710 goto out; 711 } 712 } 713 if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE)) 714 i_size_write(inode, offset + size); 715 716 mark_inode_dirty(inode); 717 718 out: 719 brelse(dibh); 720 return error; 721 } 722 723 static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len, 724 unsigned int *data_blocks, unsigned int *ind_blocks) 725 { 726 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 727 unsigned int max_blocks = ip->i_rgd->rd_free_clone; 728 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); 729 730 for (tmp = max_data; tmp > sdp->sd_diptrs;) { 731 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); 732 max_data -= tmp; 733 } 734 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve, 735 so it might end up with fewer data blocks */ 736 if (max_data <= *data_blocks) 737 return; 738 *data_blocks = max_data; 739 *ind_blocks = max_blocks - max_data; 740 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; 741 if (*len > max) { 742 *len = max; 743 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); 744 } 745 } 746 747 static long gfs2_fallocate(struct file *file, int mode, loff_t offset, 748 loff_t len) 749 { 750 struct inode *inode = file->f_path.dentry->d_inode; 751 struct gfs2_sbd *sdp = GFS2_SB(inode); 752 struct gfs2_inode *ip = GFS2_I(inode); 753 unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 754 loff_t bytes, max_bytes; 755 struct gfs2_qadata *qa; 756 int error; 757 const loff_t pos = offset; 758 const loff_t count = len; 759 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); 760 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; 761 loff_t max_chunk_size = UINT_MAX & bsize_mask; 762 next = (next + 1) << sdp->sd_sb.sb_bsize_shift; 763 764 /* We only support the FALLOC_FL_KEEP_SIZE mode */ 765 if (mode & ~FALLOC_FL_KEEP_SIZE) 766 return -EOPNOTSUPP; 767 768 offset &= bsize_mask; 769 770 len = next - offset; 771 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; 772 if (!bytes) 773 bytes = UINT_MAX; 774 bytes &= bsize_mask; 775 if (bytes == 0) 776 bytes = sdp->sd_sb.sb_bsize; 777 778 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh); 779 error = gfs2_glock_nq(&ip->i_gh); 780 if (unlikely(error)) 781 goto out_uninit; 782 783 while (len > 0) { 784 if (len < bytes) 785 bytes = len; 786 if (!gfs2_write_alloc_required(ip, offset, bytes)) { 787 len -= bytes; 788 offset += bytes; 789 continue; 790 } 791 qa = gfs2_qadata_get(ip); 792 if (!qa) { 793 error = -ENOMEM; 794 goto out_unlock; 795 } 796 797 error = gfs2_quota_lock_check(ip); 798 if (error) 799 goto out_alloc_put; 800 801 retry: 802 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); 803 804 error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks); 805 if (error) { 806 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) { 807 bytes >>= 1; 808 bytes &= bsize_mask; 809 if (bytes == 0) 810 bytes = sdp->sd_sb.sb_bsize; 811 goto retry; 812 } 813 goto out_qunlock; 814 } 815 max_bytes = bytes; 816 calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len, 817 &max_bytes, &data_blocks, &ind_blocks); 818 819 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + 820 RES_RG_HDR + gfs2_rg_blocks(ip); 821 if (gfs2_is_jdata(ip)) 822 rblocks += data_blocks ? data_blocks : 1; 823 824 error = gfs2_trans_begin(sdp, rblocks, 825 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize); 826 if (error) 827 goto out_trans_fail; 828 829 error = fallocate_chunk(inode, offset, max_bytes, mode); 830 gfs2_trans_end(sdp); 831 832 if (error) 833 goto out_trans_fail; 834 835 len -= max_bytes; 836 offset += max_bytes; 837 gfs2_inplace_release(ip); 838 gfs2_quota_unlock(ip); 839 gfs2_qadata_put(ip); 840 } 841 842 if (error == 0) 843 error = generic_write_sync(file, pos, count); 844 goto out_unlock; 845 846 out_trans_fail: 847 gfs2_inplace_release(ip); 848 out_qunlock: 849 gfs2_quota_unlock(ip); 850 out_alloc_put: 851 gfs2_qadata_put(ip); 852 out_unlock: 853 gfs2_glock_dq(&ip->i_gh); 854 out_uninit: 855 gfs2_holder_uninit(&ip->i_gh); 856 return error; 857 } 858 859 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 860 861 /** 862 * gfs2_setlease - acquire/release a file lease 863 * @file: the file pointer 864 * @arg: lease type 865 * @fl: file lock 866 * 867 * We don't currently have a way to enforce a lease across the whole 868 * cluster; until we do, disable leases (by just returning -EINVAL), 869 * unless the administrator has requested purely local locking. 870 * 871 * Locking: called under lock_flocks 872 * 873 * Returns: errno 874 */ 875 876 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) 877 { 878 return -EINVAL; 879 } 880 881 /** 882 * gfs2_lock - acquire/release a posix lock on a file 883 * @file: the file pointer 884 * @cmd: either modify or retrieve lock state, possibly wait 885 * @fl: type and range of lock 886 * 887 * Returns: errno 888 */ 889 890 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) 891 { 892 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 893 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); 894 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 895 896 if (!(fl->fl_flags & FL_POSIX)) 897 return -ENOLCK; 898 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) 899 return -ENOLCK; 900 901 if (cmd == F_CANCELLK) { 902 /* Hack: */ 903 cmd = F_SETLK; 904 fl->fl_type = F_UNLCK; 905 } 906 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 907 return -EIO; 908 if (IS_GETLK(cmd)) 909 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); 910 else if (fl->fl_type == F_UNLCK) 911 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); 912 else 913 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); 914 } 915 916 static int do_flock(struct file *file, int cmd, struct file_lock *fl) 917 { 918 struct gfs2_file *fp = file->private_data; 919 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 920 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); 921 struct gfs2_glock *gl; 922 unsigned int state; 923 int flags; 924 int error = 0; 925 926 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; 927 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; 928 929 mutex_lock(&fp->f_fl_mutex); 930 931 gl = fl_gh->gh_gl; 932 if (gl) { 933 if (fl_gh->gh_state == state) 934 goto out; 935 flock_lock_file_wait(file, 936 &(struct file_lock){.fl_type = F_UNLCK}); 937 gfs2_glock_dq_wait(fl_gh); 938 gfs2_holder_reinit(state, flags, fl_gh); 939 } else { 940 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, 941 &gfs2_flock_glops, CREATE, &gl); 942 if (error) 943 goto out; 944 gfs2_holder_init(gl, state, flags, fl_gh); 945 gfs2_glock_put(gl); 946 } 947 error = gfs2_glock_nq(fl_gh); 948 if (error) { 949 gfs2_holder_uninit(fl_gh); 950 if (error == GLR_TRYFAILED) 951 error = -EAGAIN; 952 } else { 953 error = flock_lock_file_wait(file, fl); 954 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 955 } 956 957 out: 958 mutex_unlock(&fp->f_fl_mutex); 959 return error; 960 } 961 962 static void do_unflock(struct file *file, struct file_lock *fl) 963 { 964 struct gfs2_file *fp = file->private_data; 965 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 966 967 mutex_lock(&fp->f_fl_mutex); 968 flock_lock_file_wait(file, fl); 969 if (fl_gh->gh_gl) { 970 gfs2_glock_dq_wait(fl_gh); 971 gfs2_holder_uninit(fl_gh); 972 } 973 mutex_unlock(&fp->f_fl_mutex); 974 } 975 976 /** 977 * gfs2_flock - acquire/release a flock lock on a file 978 * @file: the file pointer 979 * @cmd: either modify or retrieve lock state, possibly wait 980 * @fl: type and range of lock 981 * 982 * Returns: errno 983 */ 984 985 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) 986 { 987 if (!(fl->fl_flags & FL_FLOCK)) 988 return -ENOLCK; 989 if (fl->fl_type & LOCK_MAND) 990 return -EOPNOTSUPP; 991 992 if (fl->fl_type == F_UNLCK) { 993 do_unflock(file, fl); 994 return 0; 995 } else { 996 return do_flock(file, cmd, fl); 997 } 998 } 999 1000 const struct file_operations gfs2_file_fops = { 1001 .llseek = gfs2_llseek, 1002 .read = do_sync_read, 1003 .aio_read = generic_file_aio_read, 1004 .write = do_sync_write, 1005 .aio_write = gfs2_file_aio_write, 1006 .unlocked_ioctl = gfs2_ioctl, 1007 .mmap = gfs2_mmap, 1008 .open = gfs2_open, 1009 .release = gfs2_close, 1010 .fsync = gfs2_fsync, 1011 .lock = gfs2_lock, 1012 .flock = gfs2_flock, 1013 .splice_read = generic_file_splice_read, 1014 .splice_write = generic_file_splice_write, 1015 .setlease = gfs2_setlease, 1016 .fallocate = gfs2_fallocate, 1017 }; 1018 1019 const struct file_operations gfs2_dir_fops = { 1020 .readdir = gfs2_readdir, 1021 .unlocked_ioctl = gfs2_ioctl, 1022 .open = gfs2_open, 1023 .release = gfs2_close, 1024 .fsync = gfs2_fsync, 1025 .lock = gfs2_lock, 1026 .flock = gfs2_flock, 1027 .llseek = default_llseek, 1028 }; 1029 1030 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ 1031 1032 const struct file_operations gfs2_file_fops_nolock = { 1033 .llseek = gfs2_llseek, 1034 .read = do_sync_read, 1035 .aio_read = generic_file_aio_read, 1036 .write = do_sync_write, 1037 .aio_write = gfs2_file_aio_write, 1038 .unlocked_ioctl = gfs2_ioctl, 1039 .mmap = gfs2_mmap, 1040 .open = gfs2_open, 1041 .release = gfs2_close, 1042 .fsync = gfs2_fsync, 1043 .splice_read = generic_file_splice_read, 1044 .splice_write = generic_file_splice_write, 1045 .setlease = generic_setlease, 1046 .fallocate = gfs2_fallocate, 1047 }; 1048 1049 const struct file_operations gfs2_dir_fops_nolock = { 1050 .readdir = gfs2_readdir, 1051 .unlocked_ioctl = gfs2_ioctl, 1052 .open = gfs2_open, 1053 .release = gfs2_close, 1054 .fsync = gfs2_fsync, 1055 .llseek = default_llseek, 1056 }; 1057 1058