1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 */ 6 7#include <linux/slab.h> 8#include <linux/spinlock.h> 9#include <linux/compat.h> 10#include <linux/completion.h> 11#include <linux/buffer_head.h> 12#include <linux/pagemap.h> 13#include <linux/uio.h> 14#include <linux/blkdev.h> 15#include <linux/mm.h> 16#include <linux/mount.h> 17#include <linux/fs.h> 18#include <linux/filelock.h> 19#include <linux/gfs2_ondisk.h> 20#include <linux/falloc.h> 21#include <linux/swap.h> 22#include <linux/crc32.h> 23#include <linux/writeback.h> 24#include <linux/uaccess.h> 25#include <linux/dlm.h> 26#include <linux/dlm_plock.h> 27#include <linux/delay.h> 28#include <linux/backing-dev.h> 29#include <linux/fileattr.h> 30 31#include "gfs2.h" 32#include "incore.h" 33#include "bmap.h" 34#include "aops.h" 35#include "dir.h" 36#include "glock.h" 37#include "glops.h" 38#include "inode.h" 39#include "log.h" 40#include "meta_io.h" 41#include "quota.h" 42#include "rgrp.h" 43#include "trans.h" 44#include "util.h" 45 46/** 47 * gfs2_llseek - seek to a location in a file 48 * @file: the file 49 * @offset: the offset 50 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) 51 * 52 * SEEK_END requires the glock for the file because it references the 53 * file's size. 54 * 55 * Returns: The new offset, or errno 56 */ 57 58static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence) 59{ 60 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 61 struct gfs2_holder i_gh; 62 loff_t error; 63 64 switch (whence) { 65 case SEEK_END: 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, whence); 70 gfs2_glock_dq_uninit(&i_gh); 71 } 72 break; 73 74 case SEEK_DATA: 75 error = gfs2_seek_data(file, offset); 76 break; 77 78 case SEEK_HOLE: 79 error = gfs2_seek_hole(file, offset); 80 break; 81 82 case SEEK_CUR: 83 case SEEK_SET: 84 /* 85 * These don't reference inode->i_size and don't depend on the 86 * block mapping, so we don't need the glock. 87 */ 88 error = generic_file_llseek(file, offset, whence); 89 break; 90 default: 91 error = -EINVAL; 92 } 93 94 return error; 95} 96 97/** 98 * gfs2_readdir - Iterator for a directory 99 * @file: The directory to read from 100 * @ctx: What to feed directory entries to 101 * 102 * Returns: errno 103 */ 104 105static int gfs2_readdir(struct file *file, struct dir_context *ctx) 106{ 107 struct inode *dir = file->f_mapping->host; 108 struct gfs2_inode *dip = GFS2_I(dir); 109 struct gfs2_holder d_gh; 110 int error; 111 112 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); 113 if (error) 114 return error; 115 116 error = gfs2_dir_read(dir, ctx, &file->f_ra); 117 118 gfs2_glock_dq_uninit(&d_gh); 119 120 return error; 121} 122 123/* 124 * struct fsflag_gfs2flag 125 * 126 * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories, 127 * and to GFS2_DIF_JDATA for non-directories. 128 */ 129static struct { 130 u32 fsflag; 131 u32 gfsflag; 132} fsflag_gfs2flag[] = { 133 {FS_SYNC_FL, GFS2_DIF_SYNC}, 134 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE}, 135 {FS_APPEND_FL, GFS2_DIF_APPENDONLY}, 136 {FS_NOATIME_FL, GFS2_DIF_NOATIME}, 137 {FS_INDEX_FL, GFS2_DIF_EXHASH}, 138 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR}, 139 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA}, 140}; 141 142static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags) 143{ 144 int i; 145 u32 fsflags = 0; 146 147 if (S_ISDIR(inode->i_mode)) 148 gfsflags &= ~GFS2_DIF_JDATA; 149 else 150 gfsflags &= ~GFS2_DIF_INHERIT_JDATA; 151 152 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) 153 if (gfsflags & fsflag_gfs2flag[i].gfsflag) 154 fsflags |= fsflag_gfs2flag[i].fsflag; 155 return fsflags; 156} 157 158int gfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa) 159{ 160 struct inode *inode = d_inode(dentry); 161 struct gfs2_inode *ip = GFS2_I(inode); 162 struct gfs2_holder gh; 163 int error; 164 u32 fsflags; 165 166 if (d_is_special(dentry)) 167 return -ENOTTY; 168 169 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 170 error = gfs2_glock_nq(&gh); 171 if (error) 172 goto out_uninit; 173 174 fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); 175 176 fileattr_fill_flags(fa, fsflags); 177 178 gfs2_glock_dq(&gh); 179out_uninit: 180 gfs2_holder_uninit(&gh); 181 return error; 182} 183 184void gfs2_set_inode_flags(struct inode *inode) 185{ 186 struct gfs2_inode *ip = GFS2_I(inode); 187 unsigned int flags = inode->i_flags; 188 189 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC); 190 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode)) 191 flags |= S_NOSEC; 192 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) 193 flags |= S_IMMUTABLE; 194 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) 195 flags |= S_APPEND; 196 if (ip->i_diskflags & GFS2_DIF_NOATIME) 197 flags |= S_NOATIME; 198 if (ip->i_diskflags & GFS2_DIF_SYNC) 199 flags |= S_SYNC; 200 inode->i_flags = flags; 201} 202 203/* Flags that can be set by user space */ 204#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ 205 GFS2_DIF_IMMUTABLE| \ 206 GFS2_DIF_APPENDONLY| \ 207 GFS2_DIF_NOATIME| \ 208 GFS2_DIF_SYNC| \ 209 GFS2_DIF_TOPDIR| \ 210 GFS2_DIF_INHERIT_JDATA) 211 212/** 213 * do_gfs2_set_flags - set flags on an inode 214 * @inode: The inode 215 * @reqflags: The flags to set 216 * @mask: Indicates which flags are valid 217 * 218 */ 219static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask) 220{ 221 struct gfs2_inode *ip = GFS2_I(inode); 222 struct gfs2_sbd *sdp = GFS2_SB(inode); 223 struct buffer_head *bh; 224 struct gfs2_holder gh; 225 int error; 226 u32 new_flags, flags; 227 228 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 229 if (error) 230 return error; 231 232 error = 0; 233 flags = ip->i_diskflags; 234 new_flags = (flags & ~mask) | (reqflags & mask); 235 if ((new_flags ^ flags) == 0) 236 goto out; 237 238 if (!IS_IMMUTABLE(inode)) { 239 error = gfs2_permission(&nop_mnt_idmap, inode, MAY_WRITE); 240 if (error) 241 goto out; 242 } 243 if ((flags ^ new_flags) & GFS2_DIF_JDATA) { 244 if (new_flags & GFS2_DIF_JDATA) 245 gfs2_log_flush(sdp, ip->i_gl, 246 GFS2_LOG_HEAD_FLUSH_NORMAL | 247 GFS2_LFC_SET_FLAGS); 248 error = filemap_fdatawrite(inode->i_mapping); 249 if (error) 250 goto out; 251 error = filemap_fdatawait(inode->i_mapping); 252 if (error) 253 goto out; 254 if (new_flags & GFS2_DIF_JDATA) 255 gfs2_ordered_del_inode(ip); 256 } 257 error = gfs2_trans_begin(sdp, RES_DINODE, 0); 258 if (error) 259 goto out; 260 error = gfs2_meta_inode_buffer(ip, &bh); 261 if (error) 262 goto out_trans_end; 263 inode_set_ctime_current(inode); 264 gfs2_trans_add_meta(ip->i_gl, bh); 265 ip->i_diskflags = new_flags; 266 gfs2_dinode_out(ip, bh->b_data); 267 brelse(bh); 268 gfs2_set_inode_flags(inode); 269 gfs2_set_aops(inode); 270out_trans_end: 271 gfs2_trans_end(sdp); 272out: 273 gfs2_glock_dq_uninit(&gh); 274 return error; 275} 276 277int gfs2_fileattr_set(struct mnt_idmap *idmap, 278 struct dentry *dentry, struct fileattr *fa) 279{ 280 struct inode *inode = d_inode(dentry); 281 u32 fsflags = fa->flags, gfsflags = 0; 282 u32 mask; 283 int i; 284 285 if (d_is_special(dentry)) 286 return -ENOTTY; 287 288 if (fileattr_has_fsx(fa)) 289 return -EOPNOTSUPP; 290 291 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) { 292 if (fsflags & fsflag_gfs2flag[i].fsflag) { 293 fsflags &= ~fsflag_gfs2flag[i].fsflag; 294 gfsflags |= fsflag_gfs2flag[i].gfsflag; 295 } 296 } 297 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET) 298 return -EINVAL; 299 300 mask = GFS2_FLAGS_USER_SET; 301 if (S_ISDIR(inode->i_mode)) { 302 mask &= ~GFS2_DIF_JDATA; 303 } else { 304 /* The GFS2_DIF_TOPDIR flag is only valid for directories. */ 305 if (gfsflags & GFS2_DIF_TOPDIR) 306 return -EINVAL; 307 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA); 308 } 309 310 return do_gfs2_set_flags(inode, gfsflags, mask); 311} 312 313static int gfs2_getlabel(struct file *filp, char __user *label) 314{ 315 struct inode *inode = file_inode(filp); 316 struct gfs2_sbd *sdp = GFS2_SB(inode); 317 318 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN)) 319 return -EFAULT; 320 321 return 0; 322} 323 324static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 325{ 326 switch(cmd) { 327 case FITRIM: 328 return gfs2_fitrim(filp, (void __user *)arg); 329 case FS_IOC_GETFSLABEL: 330 return gfs2_getlabel(filp, (char __user *)arg); 331 } 332 333 return -ENOTTY; 334} 335 336#ifdef CONFIG_COMPAT 337static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 338{ 339 switch(cmd) { 340 /* Keep this list in sync with gfs2_ioctl */ 341 case FITRIM: 342 case FS_IOC_GETFSLABEL: 343 break; 344 default: 345 return -ENOIOCTLCMD; 346 } 347 348 return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); 349} 350#else 351#define gfs2_compat_ioctl NULL 352#endif 353 354/** 355 * gfs2_size_hint - Give a hint to the size of a write request 356 * @filep: The struct file 357 * @offset: The file offset of the write 358 * @size: The length of the write 359 * 360 * When we are about to do a write, this function records the total 361 * write size in order to provide a suitable hint to the lower layers 362 * about how many blocks will be required. 363 * 364 */ 365 366static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size) 367{ 368 struct inode *inode = file_inode(filep); 369 struct gfs2_sbd *sdp = GFS2_SB(inode); 370 struct gfs2_inode *ip = GFS2_I(inode); 371 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift; 372 int hint = min_t(size_t, INT_MAX, blks); 373 374 if (hint > atomic_read(&ip->i_sizehint)) 375 atomic_set(&ip->i_sizehint, hint); 376} 377 378/** 379 * gfs2_allocate_page_backing - Allocate blocks for a write fault 380 * @page: The (locked) page to allocate backing for 381 * @length: Size of the allocation 382 * 383 * We try to allocate all the blocks required for the page in one go. This 384 * might fail for various reasons, so we keep trying until all the blocks to 385 * back this page are allocated. If some of the blocks are already allocated, 386 * that is ok too. 387 */ 388static int gfs2_allocate_page_backing(struct page *page, unsigned int length) 389{ 390 u64 pos = page_offset(page); 391 392 do { 393 struct iomap iomap = { }; 394 395 if (gfs2_iomap_alloc(page->mapping->host, pos, length, &iomap)) 396 return -EIO; 397 398 if (length < iomap.length) 399 iomap.length = length; 400 length -= iomap.length; 401 pos += iomap.length; 402 } while (length > 0); 403 404 return 0; 405} 406 407/** 408 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable 409 * @vmf: The virtual memory fault containing the page to become writable 410 * 411 * When the page becomes writable, we need to ensure that we have 412 * blocks allocated on disk to back that page. 413 */ 414 415static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf) 416{ 417 struct page *page = vmf->page; 418 struct inode *inode = file_inode(vmf->vma->vm_file); 419 struct gfs2_inode *ip = GFS2_I(inode); 420 struct gfs2_sbd *sdp = GFS2_SB(inode); 421 struct gfs2_alloc_parms ap = {}; 422 u64 offset = page_offset(page); 423 unsigned int data_blocks, ind_blocks, rblocks; 424 vm_fault_t ret = VM_FAULT_LOCKED; 425 struct gfs2_holder gh; 426 unsigned int length; 427 loff_t size; 428 int err; 429 430 sb_start_pagefault(inode->i_sb); 431 432 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 433 err = gfs2_glock_nq(&gh); 434 if (err) { 435 ret = vmf_fs_error(err); 436 goto out_uninit; 437 } 438 439 /* Check page index against inode size */ 440 size = i_size_read(inode); 441 if (offset >= size) { 442 ret = VM_FAULT_SIGBUS; 443 goto out_unlock; 444 } 445 446 /* Update file times before taking page lock */ 447 file_update_time(vmf->vma->vm_file); 448 449 /* page is wholly or partially inside EOF */ 450 if (size - offset < PAGE_SIZE) 451 length = size - offset; 452 else 453 length = PAGE_SIZE; 454 455 gfs2_size_hint(vmf->vma->vm_file, offset, length); 456 457 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); 458 set_bit(GIF_SW_PAGED, &ip->i_flags); 459 460 /* 461 * iomap_writepage / iomap_writepages currently don't support inline 462 * files, so always unstuff here. 463 */ 464 465 if (!gfs2_is_stuffed(ip) && 466 !gfs2_write_alloc_required(ip, offset, length)) { 467 lock_page(page); 468 if (!PageUptodate(page) || page->mapping != inode->i_mapping) { 469 ret = VM_FAULT_NOPAGE; 470 unlock_page(page); 471 } 472 goto out_unlock; 473 } 474 475 err = gfs2_rindex_update(sdp); 476 if (err) { 477 ret = vmf_fs_error(err); 478 goto out_unlock; 479 } 480 481 gfs2_write_calc_reserv(ip, length, &data_blocks, &ind_blocks); 482 ap.target = data_blocks + ind_blocks; 483 err = gfs2_quota_lock_check(ip, &ap); 484 if (err) { 485 ret = vmf_fs_error(err); 486 goto out_unlock; 487 } 488 err = gfs2_inplace_reserve(ip, &ap); 489 if (err) { 490 ret = vmf_fs_error(err); 491 goto out_quota_unlock; 492 } 493 494 rblocks = RES_DINODE + ind_blocks; 495 if (gfs2_is_jdata(ip)) 496 rblocks += data_blocks ? data_blocks : 1; 497 if (ind_blocks || data_blocks) { 498 rblocks += RES_STATFS + RES_QUOTA; 499 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks); 500 } 501 err = gfs2_trans_begin(sdp, rblocks, 0); 502 if (err) { 503 ret = vmf_fs_error(err); 504 goto out_trans_fail; 505 } 506 507 /* Unstuff, if required, and allocate backing blocks for page */ 508 if (gfs2_is_stuffed(ip)) { 509 err = gfs2_unstuff_dinode(ip); 510 if (err) { 511 ret = vmf_fs_error(err); 512 goto out_trans_end; 513 } 514 } 515 516 lock_page(page); 517 /* If truncated, we must retry the operation, we may have raced 518 * with the glock demotion code. 519 */ 520 if (!PageUptodate(page) || page->mapping != inode->i_mapping) { 521 ret = VM_FAULT_NOPAGE; 522 goto out_page_locked; 523 } 524 525 err = gfs2_allocate_page_backing(page, length); 526 if (err) 527 ret = vmf_fs_error(err); 528 529out_page_locked: 530 if (ret != VM_FAULT_LOCKED) 531 unlock_page(page); 532out_trans_end: 533 gfs2_trans_end(sdp); 534out_trans_fail: 535 gfs2_inplace_release(ip); 536out_quota_unlock: 537 gfs2_quota_unlock(ip); 538out_unlock: 539 gfs2_glock_dq(&gh); 540out_uninit: 541 gfs2_holder_uninit(&gh); 542 if (ret == VM_FAULT_LOCKED) { 543 set_page_dirty(page); 544 wait_for_stable_page(page); 545 } 546 sb_end_pagefault(inode->i_sb); 547 return ret; 548} 549 550static vm_fault_t gfs2_fault(struct vm_fault *vmf) 551{ 552 struct inode *inode = file_inode(vmf->vma->vm_file); 553 struct gfs2_inode *ip = GFS2_I(inode); 554 struct gfs2_holder gh; 555 vm_fault_t ret; 556 int err; 557 558 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 559 err = gfs2_glock_nq(&gh); 560 if (err) { 561 ret = vmf_fs_error(err); 562 goto out_uninit; 563 } 564 ret = filemap_fault(vmf); 565 gfs2_glock_dq(&gh); 566out_uninit: 567 gfs2_holder_uninit(&gh); 568 return ret; 569} 570 571static const struct vm_operations_struct gfs2_vm_ops = { 572 .fault = gfs2_fault, 573 .map_pages = filemap_map_pages, 574 .page_mkwrite = gfs2_page_mkwrite, 575}; 576 577/** 578 * gfs2_mmap 579 * @file: The file to map 580 * @vma: The VMA which described the mapping 581 * 582 * There is no need to get a lock here unless we should be updating 583 * atime. We ignore any locking errors since the only consequence is 584 * a missed atime update (which will just be deferred until later). 585 * 586 * Returns: 0 587 */ 588 589static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) 590{ 591 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 592 593 if (!(file->f_flags & O_NOATIME) && 594 !IS_NOATIME(&ip->i_inode)) { 595 struct gfs2_holder i_gh; 596 int error; 597 598 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, 599 &i_gh); 600 if (error) 601 return error; 602 /* grab lock to update inode */ 603 gfs2_glock_dq_uninit(&i_gh); 604 file_accessed(file); 605 } 606 vma->vm_ops = &gfs2_vm_ops; 607 608 return 0; 609} 610 611/** 612 * gfs2_open_common - This is common to open and atomic_open 613 * @inode: The inode being opened 614 * @file: The file being opened 615 * 616 * This maybe called under a glock or not depending upon how it has 617 * been called. We must always be called under a glock for regular 618 * files, however. For other file types, it does not matter whether 619 * we hold the glock or not. 620 * 621 * Returns: Error code or 0 for success 622 */ 623 624int gfs2_open_common(struct inode *inode, struct file *file) 625{ 626 struct gfs2_file *fp; 627 int ret; 628 629 if (S_ISREG(inode->i_mode)) { 630 ret = generic_file_open(inode, file); 631 if (ret) 632 return ret; 633 634 if (!gfs2_is_jdata(GFS2_I(inode))) 635 file->f_mode |= FMODE_CAN_ODIRECT; 636 } 637 638 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS); 639 if (!fp) 640 return -ENOMEM; 641 642 mutex_init(&fp->f_fl_mutex); 643 644 gfs2_assert_warn(GFS2_SB(inode), !file->private_data); 645 file->private_data = fp; 646 if (file->f_mode & FMODE_WRITE) { 647 ret = gfs2_qa_get(GFS2_I(inode)); 648 if (ret) 649 goto fail; 650 } 651 return 0; 652 653fail: 654 kfree(file->private_data); 655 file->private_data = NULL; 656 return ret; 657} 658 659/** 660 * gfs2_open - open a file 661 * @inode: the inode to open 662 * @file: the struct file for this opening 663 * 664 * After atomic_open, this function is only used for opening files 665 * which are already cached. We must still get the glock for regular 666 * files to ensure that we have the file size uptodate for the large 667 * file check which is in the common code. That is only an issue for 668 * regular files though. 669 * 670 * Returns: errno 671 */ 672 673static int gfs2_open(struct inode *inode, struct file *file) 674{ 675 struct gfs2_inode *ip = GFS2_I(inode); 676 struct gfs2_holder i_gh; 677 int error; 678 bool need_unlock = false; 679 680 if (S_ISREG(ip->i_inode.i_mode)) { 681 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, 682 &i_gh); 683 if (error) 684 return error; 685 need_unlock = true; 686 } 687 688 error = gfs2_open_common(inode, file); 689 690 if (need_unlock) 691 gfs2_glock_dq_uninit(&i_gh); 692 693 return error; 694} 695 696/** 697 * gfs2_release - called to close a struct file 698 * @inode: the inode the struct file belongs to 699 * @file: the struct file being closed 700 * 701 * Returns: errno 702 */ 703 704static int gfs2_release(struct inode *inode, struct file *file) 705{ 706 struct gfs2_inode *ip = GFS2_I(inode); 707 708 kfree(file->private_data); 709 file->private_data = NULL; 710 711 if (file->f_mode & FMODE_WRITE) { 712 if (gfs2_rs_active(&ip->i_res)) 713 gfs2_rs_delete(ip); 714 gfs2_qa_put(ip); 715 } 716 return 0; 717} 718 719/** 720 * gfs2_fsync - sync the dirty data for a file (across the cluster) 721 * @file: the file that points to the dentry 722 * @start: the start position in the file to sync 723 * @end: the end position in the file to sync 724 * @datasync: set if we can ignore timestamp changes 725 * 726 * We split the data flushing here so that we don't wait for the data 727 * until after we've also sent the metadata to disk. Note that for 728 * data=ordered, we will write & wait for the data at the log flush 729 * stage anyway, so this is unlikely to make much of a difference 730 * except in the data=writeback case. 731 * 732 * If the fdatawrite fails due to any reason except -EIO, we will 733 * continue the remainder of the fsync, although we'll still report 734 * the error at the end. This is to match filemap_write_and_wait_range() 735 * behaviour. 736 * 737 * Returns: errno 738 */ 739 740static int gfs2_fsync(struct file *file, loff_t start, loff_t end, 741 int datasync) 742{ 743 struct address_space *mapping = file->f_mapping; 744 struct inode *inode = mapping->host; 745 int sync_state = inode->i_state & I_DIRTY; 746 struct gfs2_inode *ip = GFS2_I(inode); 747 int ret = 0, ret1 = 0; 748 749 if (mapping->nrpages) { 750 ret1 = filemap_fdatawrite_range(mapping, start, end); 751 if (ret1 == -EIO) 752 return ret1; 753 } 754 755 if (!gfs2_is_jdata(ip)) 756 sync_state &= ~I_DIRTY_PAGES; 757 if (datasync) 758 sync_state &= ~I_DIRTY_SYNC; 759 760 if (sync_state) { 761 ret = sync_inode_metadata(inode, 1); 762 if (ret) 763 return ret; 764 if (gfs2_is_jdata(ip)) 765 ret = file_write_and_wait(file); 766 if (ret) 767 return ret; 768 gfs2_ail_flush(ip->i_gl, 1); 769 } 770 771 if (mapping->nrpages) 772 ret = file_fdatawait_range(file, start, end); 773 774 return ret ? ret : ret1; 775} 776 777static inline bool should_fault_in_pages(struct iov_iter *i, 778 struct kiocb *iocb, 779 size_t *prev_count, 780 size_t *window_size) 781{ 782 size_t count = iov_iter_count(i); 783 size_t size, offs; 784 785 if (!count) 786 return false; 787 if (!user_backed_iter(i)) 788 return false; 789 790 /* 791 * Try to fault in multiple pages initially. When that doesn't result 792 * in any progress, fall back to a single page. 793 */ 794 size = PAGE_SIZE; 795 offs = offset_in_page(iocb->ki_pos); 796 if (*prev_count != count) { 797 size_t nr_dirtied; 798 799 nr_dirtied = max(current->nr_dirtied_pause - 800 current->nr_dirtied, 8); 801 size = min_t(size_t, SZ_1M, nr_dirtied << PAGE_SHIFT); 802 } 803 804 *prev_count = count; 805 *window_size = size - offs; 806 return true; 807} 808 809static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to, 810 struct gfs2_holder *gh) 811{ 812 struct file *file = iocb->ki_filp; 813 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 814 size_t prev_count = 0, window_size = 0; 815 size_t read = 0; 816 ssize_t ret; 817 818 /* 819 * In this function, we disable page faults when we're holding the 820 * inode glock while doing I/O. If a page fault occurs, we indicate 821 * that the inode glock may be dropped, fault in the pages manually, 822 * and retry. 823 * 824 * Unlike generic_file_read_iter, for reads, iomap_dio_rw can trigger 825 * physical as well as manual page faults, and we need to disable both 826 * kinds. 827 * 828 * For direct I/O, gfs2 takes the inode glock in deferred mode. This 829 * locking mode is compatible with other deferred holders, so multiple 830 * processes and nodes can do direct I/O to a file at the same time. 831 * There's no guarantee that reads or writes will be atomic. Any 832 * coordination among readers and writers needs to happen externally. 833 */ 834 835 if (!iov_iter_count(to)) 836 return 0; /* skip atime */ 837 838 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh); 839retry: 840 ret = gfs2_glock_nq(gh); 841 if (ret) 842 goto out_uninit; 843 pagefault_disable(); 844 to->nofault = true; 845 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL, 846 IOMAP_DIO_PARTIAL, NULL, read); 847 to->nofault = false; 848 pagefault_enable(); 849 if (ret <= 0 && ret != -EFAULT) 850 goto out_unlock; 851 /* No increment (+=) because iomap_dio_rw returns a cumulative value. */ 852 if (ret > 0) 853 read = ret; 854 855 if (should_fault_in_pages(to, iocb, &prev_count, &window_size)) { 856 gfs2_glock_dq(gh); 857 window_size -= fault_in_iov_iter_writeable(to, window_size); 858 if (window_size) 859 goto retry; 860 } 861out_unlock: 862 if (gfs2_holder_queued(gh)) 863 gfs2_glock_dq(gh); 864out_uninit: 865 gfs2_holder_uninit(gh); 866 /* User space doesn't expect partial success. */ 867 if (ret < 0) 868 return ret; 869 return read; 870} 871 872static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from, 873 struct gfs2_holder *gh) 874{ 875 struct file *file = iocb->ki_filp; 876 struct inode *inode = file->f_mapping->host; 877 struct gfs2_inode *ip = GFS2_I(inode); 878 size_t prev_count = 0, window_size = 0; 879 size_t written = 0; 880 bool enough_retries; 881 ssize_t ret; 882 883 /* 884 * In this function, we disable page faults when we're holding the 885 * inode glock while doing I/O. If a page fault occurs, we indicate 886 * that the inode glock may be dropped, fault in the pages manually, 887 * and retry. 888 * 889 * For writes, iomap_dio_rw only triggers manual page faults, so we 890 * don't need to disable physical ones. 891 */ 892 893 /* 894 * Deferred lock, even if its a write, since we do no allocation on 895 * this path. All we need to change is the atime, and this lock mode 896 * ensures that other nodes have flushed their buffered read caches 897 * (i.e. their page cache entries for this inode). We do not, 898 * unfortunately, have the option of only flushing a range like the 899 * VFS does. 900 */ 901 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, gh); 902retry: 903 ret = gfs2_glock_nq(gh); 904 if (ret) 905 goto out_uninit; 906 /* Silently fall back to buffered I/O when writing beyond EOF */ 907 if (iocb->ki_pos + iov_iter_count(from) > i_size_read(&ip->i_inode)) 908 goto out_unlock; 909 910 from->nofault = true; 911 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL, 912 IOMAP_DIO_PARTIAL, NULL, written); 913 from->nofault = false; 914 if (ret <= 0) { 915 if (ret == -ENOTBLK) 916 ret = 0; 917 if (ret != -EFAULT) 918 goto out_unlock; 919 } 920 /* No increment (+=) because iomap_dio_rw returns a cumulative value. */ 921 if (ret > 0) 922 written = ret; 923 924 enough_retries = prev_count == iov_iter_count(from) && 925 window_size <= PAGE_SIZE; 926 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) { 927 gfs2_glock_dq(gh); 928 window_size -= fault_in_iov_iter_readable(from, window_size); 929 if (window_size) { 930 if (!enough_retries) 931 goto retry; 932 /* fall back to buffered I/O */ 933 ret = 0; 934 } 935 } 936out_unlock: 937 if (gfs2_holder_queued(gh)) 938 gfs2_glock_dq(gh); 939out_uninit: 940 gfs2_holder_uninit(gh); 941 /* User space doesn't expect partial success. */ 942 if (ret < 0) 943 return ret; 944 return written; 945} 946 947static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to) 948{ 949 struct gfs2_inode *ip; 950 struct gfs2_holder gh; 951 size_t prev_count = 0, window_size = 0; 952 size_t read = 0; 953 ssize_t ret; 954 955 /* 956 * In this function, we disable page faults when we're holding the 957 * inode glock while doing I/O. If a page fault occurs, we indicate 958 * that the inode glock may be dropped, fault in the pages manually, 959 * and retry. 960 */ 961 962 if (iocb->ki_flags & IOCB_DIRECT) 963 return gfs2_file_direct_read(iocb, to, &gh); 964 965 pagefault_disable(); 966 iocb->ki_flags |= IOCB_NOIO; 967 ret = generic_file_read_iter(iocb, to); 968 iocb->ki_flags &= ~IOCB_NOIO; 969 pagefault_enable(); 970 if (ret >= 0) { 971 if (!iov_iter_count(to)) 972 return ret; 973 read = ret; 974 } else if (ret != -EFAULT) { 975 if (ret != -EAGAIN) 976 return ret; 977 if (iocb->ki_flags & IOCB_NOWAIT) 978 return ret; 979 } 980 ip = GFS2_I(iocb->ki_filp->f_mapping->host); 981 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 982retry: 983 ret = gfs2_glock_nq(&gh); 984 if (ret) 985 goto out_uninit; 986 pagefault_disable(); 987 ret = generic_file_read_iter(iocb, to); 988 pagefault_enable(); 989 if (ret <= 0 && ret != -EFAULT) 990 goto out_unlock; 991 if (ret > 0) 992 read += ret; 993 994 if (should_fault_in_pages(to, iocb, &prev_count, &window_size)) { 995 gfs2_glock_dq(&gh); 996 window_size -= fault_in_iov_iter_writeable(to, window_size); 997 if (window_size) 998 goto retry; 999 } 1000out_unlock: 1001 if (gfs2_holder_queued(&gh)) 1002 gfs2_glock_dq(&gh); 1003out_uninit: 1004 gfs2_holder_uninit(&gh); 1005 return read ? read : ret; 1006} 1007 1008static ssize_t gfs2_file_buffered_write(struct kiocb *iocb, 1009 struct iov_iter *from, 1010 struct gfs2_holder *gh) 1011{ 1012 struct file *file = iocb->ki_filp; 1013 struct inode *inode = file_inode(file); 1014 struct gfs2_inode *ip = GFS2_I(inode); 1015 struct gfs2_sbd *sdp = GFS2_SB(inode); 1016 struct gfs2_holder *statfs_gh = NULL; 1017 size_t prev_count = 0, window_size = 0; 1018 size_t orig_count = iov_iter_count(from); 1019 size_t written = 0; 1020 ssize_t ret; 1021 1022 /* 1023 * In this function, we disable page faults when we're holding the 1024 * inode glock while doing I/O. If a page fault occurs, we indicate 1025 * that the inode glock may be dropped, fault in the pages manually, 1026 * and retry. 1027 */ 1028 1029 if (inode == sdp->sd_rindex) { 1030 statfs_gh = kmalloc(sizeof(*statfs_gh), GFP_NOFS); 1031 if (!statfs_gh) 1032 return -ENOMEM; 1033 } 1034 1035 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, gh); 1036 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) { 1037retry: 1038 window_size -= fault_in_iov_iter_readable(from, window_size); 1039 if (!window_size) { 1040 ret = -EFAULT; 1041 goto out_uninit; 1042 } 1043 from->count = min(from->count, window_size); 1044 } 1045 ret = gfs2_glock_nq(gh); 1046 if (ret) 1047 goto out_uninit; 1048 1049 if (inode == sdp->sd_rindex) { 1050 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 1051 1052 ret = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 1053 GL_NOCACHE, statfs_gh); 1054 if (ret) 1055 goto out_unlock; 1056 } 1057 1058 pagefault_disable(); 1059 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops); 1060 pagefault_enable(); 1061 if (ret > 0) 1062 written += ret; 1063 1064 if (inode == sdp->sd_rindex) 1065 gfs2_glock_dq_uninit(statfs_gh); 1066 1067 if (ret <= 0 && ret != -EFAULT) 1068 goto out_unlock; 1069 1070 from->count = orig_count - written; 1071 if (should_fault_in_pages(from, iocb, &prev_count, &window_size)) { 1072 gfs2_glock_dq(gh); 1073 goto retry; 1074 } 1075out_unlock: 1076 if (gfs2_holder_queued(gh)) 1077 gfs2_glock_dq(gh); 1078out_uninit: 1079 gfs2_holder_uninit(gh); 1080 kfree(statfs_gh); 1081 from->count = orig_count - written; 1082 return written ? written : ret; 1083} 1084 1085/** 1086 * gfs2_file_write_iter - Perform a write to a file 1087 * @iocb: The io context 1088 * @from: The data to write 1089 * 1090 * We have to do a lock/unlock here to refresh the inode size for 1091 * O_APPEND writes, otherwise we can land up writing at the wrong 1092 * offset. There is still a race, but provided the app is using its 1093 * own file locking, this will make O_APPEND work as expected. 1094 * 1095 */ 1096 1097static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from) 1098{ 1099 struct file *file = iocb->ki_filp; 1100 struct inode *inode = file_inode(file); 1101 struct gfs2_inode *ip = GFS2_I(inode); 1102 struct gfs2_holder gh; 1103 ssize_t ret; 1104 1105 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from)); 1106 1107 if (iocb->ki_flags & IOCB_APPEND) { 1108 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); 1109 if (ret) 1110 return ret; 1111 gfs2_glock_dq_uninit(&gh); 1112 } 1113 1114 inode_lock(inode); 1115 ret = generic_write_checks(iocb, from); 1116 if (ret <= 0) 1117 goto out_unlock; 1118 1119 ret = file_remove_privs(file); 1120 if (ret) 1121 goto out_unlock; 1122 1123 if (iocb->ki_flags & IOCB_DIRECT) { 1124 struct address_space *mapping = file->f_mapping; 1125 ssize_t buffered, ret2; 1126 1127 /* 1128 * Note that under direct I/O, we don't allow and inode 1129 * timestamp updates, so we're not calling file_update_time() 1130 * here. 1131 */ 1132 1133 ret = gfs2_file_direct_write(iocb, from, &gh); 1134 if (ret < 0 || !iov_iter_count(from)) 1135 goto out_unlock; 1136 1137 iocb->ki_flags |= IOCB_DSYNC; 1138 buffered = gfs2_file_buffered_write(iocb, from, &gh); 1139 if (unlikely(buffered <= 0)) { 1140 if (!ret) 1141 ret = buffered; 1142 goto out_unlock; 1143 } 1144 1145 /* 1146 * We need to ensure that the page cache pages are written to 1147 * disk and invalidated to preserve the expected O_DIRECT 1148 * semantics. If the writeback or invalidate fails, only report 1149 * the direct I/O range as we don't know if the buffered pages 1150 * made it to disk. 1151 */ 1152 ret2 = generic_write_sync(iocb, buffered); 1153 invalidate_mapping_pages(mapping, 1154 (iocb->ki_pos - buffered) >> PAGE_SHIFT, 1155 (iocb->ki_pos - 1) >> PAGE_SHIFT); 1156 if (!ret || ret2 > 0) 1157 ret += ret2; 1158 } else { 1159 ret = file_update_time(file); 1160 if (ret) 1161 goto out_unlock; 1162 1163 ret = gfs2_file_buffered_write(iocb, from, &gh); 1164 if (likely(ret > 0)) 1165 ret = generic_write_sync(iocb, ret); 1166 } 1167 1168out_unlock: 1169 inode_unlock(inode); 1170 return ret; 1171} 1172 1173static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len, 1174 int mode) 1175{ 1176 struct super_block *sb = inode->i_sb; 1177 struct gfs2_inode *ip = GFS2_I(inode); 1178 loff_t end = offset + len; 1179 struct buffer_head *dibh; 1180 int error; 1181 1182 error = gfs2_meta_inode_buffer(ip, &dibh); 1183 if (unlikely(error)) 1184 return error; 1185 1186 gfs2_trans_add_meta(ip->i_gl, dibh); 1187 1188 if (gfs2_is_stuffed(ip)) { 1189 error = gfs2_unstuff_dinode(ip); 1190 if (unlikely(error)) 1191 goto out; 1192 } 1193 1194 while (offset < end) { 1195 struct iomap iomap = { }; 1196 1197 error = gfs2_iomap_alloc(inode, offset, end - offset, &iomap); 1198 if (error) 1199 goto out; 1200 offset = iomap.offset + iomap.length; 1201 if (!(iomap.flags & IOMAP_F_NEW)) 1202 continue; 1203 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits, 1204 iomap.length >> inode->i_blkbits, 1205 GFP_NOFS); 1206 if (error) { 1207 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n"); 1208 goto out; 1209 } 1210 } 1211out: 1212 brelse(dibh); 1213 return error; 1214} 1215 1216/** 1217 * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of 1218 * blocks, determine how many bytes can be written. 1219 * @ip: The inode in question. 1220 * @len: Max cap of bytes. What we return in *len must be <= this. 1221 * @data_blocks: Compute and return the number of data blocks needed 1222 * @ind_blocks: Compute and return the number of indirect blocks needed 1223 * @max_blocks: The total blocks available to work with. 1224 * 1225 * Returns: void, but @len, @data_blocks and @ind_blocks are filled in. 1226 */ 1227static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len, 1228 unsigned int *data_blocks, unsigned int *ind_blocks, 1229 unsigned int max_blocks) 1230{ 1231 loff_t max = *len; 1232 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1233 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1); 1234 1235 for (tmp = max_data; tmp > sdp->sd_diptrs;) { 1236 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); 1237 max_data -= tmp; 1238 } 1239 1240 *data_blocks = max_data; 1241 *ind_blocks = max_blocks - max_data; 1242 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift; 1243 if (*len > max) { 1244 *len = max; 1245 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks); 1246 } 1247} 1248 1249static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len) 1250{ 1251 struct inode *inode = file_inode(file); 1252 struct gfs2_sbd *sdp = GFS2_SB(inode); 1253 struct gfs2_inode *ip = GFS2_I(inode); 1254 struct gfs2_alloc_parms ap = {}; 1255 unsigned int data_blocks = 0, ind_blocks = 0, rblocks; 1256 loff_t bytes, max_bytes, max_blks; 1257 int error; 1258 const loff_t pos = offset; 1259 const loff_t count = len; 1260 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1); 1261 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift; 1262 loff_t max_chunk_size = UINT_MAX & bsize_mask; 1263 1264 next = (next + 1) << sdp->sd_sb.sb_bsize_shift; 1265 1266 offset &= bsize_mask; 1267 1268 len = next - offset; 1269 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2; 1270 if (!bytes) 1271 bytes = UINT_MAX; 1272 bytes &= bsize_mask; 1273 if (bytes == 0) 1274 bytes = sdp->sd_sb.sb_bsize; 1275 1276 gfs2_size_hint(file, offset, len); 1277 1278 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks); 1279 ap.min_target = data_blocks + ind_blocks; 1280 1281 while (len > 0) { 1282 if (len < bytes) 1283 bytes = len; 1284 if (!gfs2_write_alloc_required(ip, offset, bytes)) { 1285 len -= bytes; 1286 offset += bytes; 1287 continue; 1288 } 1289 1290 /* We need to determine how many bytes we can actually 1291 * fallocate without exceeding quota or going over the 1292 * end of the fs. We start off optimistically by assuming 1293 * we can write max_bytes */ 1294 max_bytes = (len > max_chunk_size) ? max_chunk_size : len; 1295 1296 /* Since max_bytes is most likely a theoretical max, we 1297 * calculate a more realistic 'bytes' to serve as a good 1298 * starting point for the number of bytes we may be able 1299 * to write */ 1300 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks); 1301 ap.target = data_blocks + ind_blocks; 1302 1303 error = gfs2_quota_lock_check(ip, &ap); 1304 if (error) 1305 return error; 1306 /* ap.allowed tells us how many blocks quota will allow 1307 * us to write. Check if this reduces max_blks */ 1308 max_blks = UINT_MAX; 1309 if (ap.allowed) 1310 max_blks = ap.allowed; 1311 1312 error = gfs2_inplace_reserve(ip, &ap); 1313 if (error) 1314 goto out_qunlock; 1315 1316 /* check if the selected rgrp limits our max_blks further */ 1317 if (ip->i_res.rs_reserved < max_blks) 1318 max_blks = ip->i_res.rs_reserved; 1319 1320 /* Almost done. Calculate bytes that can be written using 1321 * max_blks. We also recompute max_bytes, data_blocks and 1322 * ind_blocks */ 1323 calc_max_reserv(ip, &max_bytes, &data_blocks, 1324 &ind_blocks, max_blks); 1325 1326 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA + 1327 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks); 1328 if (gfs2_is_jdata(ip)) 1329 rblocks += data_blocks ? data_blocks : 1; 1330 1331 error = gfs2_trans_begin(sdp, rblocks, 1332 PAGE_SIZE >> inode->i_blkbits); 1333 if (error) 1334 goto out_trans_fail; 1335 1336 error = fallocate_chunk(inode, offset, max_bytes, mode); 1337 gfs2_trans_end(sdp); 1338 1339 if (error) 1340 goto out_trans_fail; 1341 1342 len -= max_bytes; 1343 offset += max_bytes; 1344 gfs2_inplace_release(ip); 1345 gfs2_quota_unlock(ip); 1346 } 1347 1348 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) 1349 i_size_write(inode, pos + count); 1350 file_update_time(file); 1351 mark_inode_dirty(inode); 1352 1353 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) 1354 return vfs_fsync_range(file, pos, pos + count - 1, 1355 (file->f_flags & __O_SYNC) ? 0 : 1); 1356 return 0; 1357 1358out_trans_fail: 1359 gfs2_inplace_release(ip); 1360out_qunlock: 1361 gfs2_quota_unlock(ip); 1362 return error; 1363} 1364 1365static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len) 1366{ 1367 struct inode *inode = file_inode(file); 1368 struct gfs2_sbd *sdp = GFS2_SB(inode); 1369 struct gfs2_inode *ip = GFS2_I(inode); 1370 struct gfs2_holder gh; 1371 int ret; 1372 1373 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)) 1374 return -EOPNOTSUPP; 1375 /* fallocate is needed by gfs2_grow to reserve space in the rindex */ 1376 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex) 1377 return -EOPNOTSUPP; 1378 1379 inode_lock(inode); 1380 1381 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 1382 ret = gfs2_glock_nq(&gh); 1383 if (ret) 1384 goto out_uninit; 1385 1386 if (!(mode & FALLOC_FL_KEEP_SIZE) && 1387 (offset + len) > inode->i_size) { 1388 ret = inode_newsize_ok(inode, offset + len); 1389 if (ret) 1390 goto out_unlock; 1391 } 1392 1393 ret = get_write_access(inode); 1394 if (ret) 1395 goto out_unlock; 1396 1397 if (mode & FALLOC_FL_PUNCH_HOLE) { 1398 ret = __gfs2_punch_hole(file, offset, len); 1399 } else { 1400 ret = __gfs2_fallocate(file, mode, offset, len); 1401 if (ret) 1402 gfs2_rs_deltree(&ip->i_res); 1403 } 1404 1405 put_write_access(inode); 1406out_unlock: 1407 gfs2_glock_dq(&gh); 1408out_uninit: 1409 gfs2_holder_uninit(&gh); 1410 inode_unlock(inode); 1411 return ret; 1412} 1413 1414static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe, 1415 struct file *out, loff_t *ppos, 1416 size_t len, unsigned int flags) 1417{ 1418 ssize_t ret; 1419 1420 gfs2_size_hint(out, *ppos, len); 1421 1422 ret = iter_file_splice_write(pipe, out, ppos, len, flags); 1423 return ret; 1424} 1425 1426#ifdef CONFIG_GFS2_FS_LOCKING_DLM 1427 1428/** 1429 * gfs2_lock - acquire/release a posix lock on a file 1430 * @file: the file pointer 1431 * @cmd: either modify or retrieve lock state, possibly wait 1432 * @fl: type and range of lock 1433 * 1434 * Returns: errno 1435 */ 1436 1437static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) 1438{ 1439 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); 1440 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); 1441 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 1442 1443 if (!(fl->c.flc_flags & FL_POSIX)) 1444 return -ENOLCK; 1445 if (gfs2_withdrawing_or_withdrawn(sdp)) { 1446 if (lock_is_unlock(fl)) 1447 locks_lock_file_wait(file, fl); 1448 return -EIO; 1449 } 1450 if (cmd == F_CANCELLK) 1451 return dlm_posix_cancel(ls->ls_dlm, ip->i_no_addr, file, fl); 1452 else if (IS_GETLK(cmd)) 1453 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); 1454 else if (lock_is_unlock(fl)) 1455 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); 1456 else 1457 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); 1458} 1459 1460static void __flock_holder_uninit(struct file *file, struct gfs2_holder *fl_gh) 1461{ 1462 struct gfs2_glock *gl = gfs2_glock_hold(fl_gh->gh_gl); 1463 1464 /* 1465 * Make sure gfs2_glock_put() won't sleep under the file->f_lock 1466 * spinlock. 1467 */ 1468 1469 spin_lock(&file->f_lock); 1470 gfs2_holder_uninit(fl_gh); 1471 spin_unlock(&file->f_lock); 1472 gfs2_glock_put(gl); 1473} 1474 1475static int do_flock(struct file *file, int cmd, struct file_lock *fl) 1476{ 1477 struct gfs2_file *fp = file->private_data; 1478 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 1479 struct gfs2_inode *ip = GFS2_I(file_inode(file)); 1480 struct gfs2_glock *gl; 1481 unsigned int state; 1482 u16 flags; 1483 int error = 0; 1484 int sleeptime; 1485 1486 state = lock_is_write(fl) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; 1487 flags = GL_EXACT | GL_NOPID; 1488 if (!IS_SETLKW(cmd)) 1489 flags |= LM_FLAG_TRY_1CB; 1490 1491 mutex_lock(&fp->f_fl_mutex); 1492 1493 if (gfs2_holder_initialized(fl_gh)) { 1494 struct file_lock request; 1495 if (fl_gh->gh_state == state) 1496 goto out; 1497 locks_init_lock(&request); 1498 request.c.flc_type = F_UNLCK; 1499 request.c.flc_flags = FL_FLOCK; 1500 locks_lock_file_wait(file, &request); 1501 gfs2_glock_dq(fl_gh); 1502 gfs2_holder_reinit(state, flags, fl_gh); 1503 } else { 1504 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, 1505 &gfs2_flock_glops, CREATE, &gl); 1506 if (error) 1507 goto out; 1508 spin_lock(&file->f_lock); 1509 gfs2_holder_init(gl, state, flags, fl_gh); 1510 spin_unlock(&file->f_lock); 1511 gfs2_glock_put(gl); 1512 } 1513 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) { 1514 error = gfs2_glock_nq(fl_gh); 1515 if (error != GLR_TRYFAILED) 1516 break; 1517 fl_gh->gh_flags &= ~LM_FLAG_TRY_1CB; 1518 fl_gh->gh_flags |= LM_FLAG_TRY; 1519 msleep(sleeptime); 1520 } 1521 if (error) { 1522 __flock_holder_uninit(file, fl_gh); 1523 if (error == GLR_TRYFAILED) 1524 error = -EAGAIN; 1525 } else { 1526 error = locks_lock_file_wait(file, fl); 1527 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); 1528 } 1529 1530out: 1531 mutex_unlock(&fp->f_fl_mutex); 1532 return error; 1533} 1534 1535static void do_unflock(struct file *file, struct file_lock *fl) 1536{ 1537 struct gfs2_file *fp = file->private_data; 1538 struct gfs2_holder *fl_gh = &fp->f_fl_gh; 1539 1540 mutex_lock(&fp->f_fl_mutex); 1541 locks_lock_file_wait(file, fl); 1542 if (gfs2_holder_initialized(fl_gh)) { 1543 gfs2_glock_dq(fl_gh); 1544 __flock_holder_uninit(file, fl_gh); 1545 } 1546 mutex_unlock(&fp->f_fl_mutex); 1547} 1548 1549/** 1550 * gfs2_flock - acquire/release a flock lock on a file 1551 * @file: the file pointer 1552 * @cmd: either modify or retrieve lock state, possibly wait 1553 * @fl: type and range of lock 1554 * 1555 * Returns: errno 1556 */ 1557 1558static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) 1559{ 1560 if (!(fl->c.flc_flags & FL_FLOCK)) 1561 return -ENOLCK; 1562 1563 if (lock_is_unlock(fl)) { 1564 do_unflock(file, fl); 1565 return 0; 1566 } else { 1567 return do_flock(file, cmd, fl); 1568 } 1569} 1570 1571const struct file_operations gfs2_file_fops = { 1572 .llseek = gfs2_llseek, 1573 .read_iter = gfs2_file_read_iter, 1574 .write_iter = gfs2_file_write_iter, 1575 .iopoll = iocb_bio_iopoll, 1576 .unlocked_ioctl = gfs2_ioctl, 1577 .compat_ioctl = gfs2_compat_ioctl, 1578 .mmap = gfs2_mmap, 1579 .open = gfs2_open, 1580 .release = gfs2_release, 1581 .fsync = gfs2_fsync, 1582 .lock = gfs2_lock, 1583 .flock = gfs2_flock, 1584 .splice_read = copy_splice_read, 1585 .splice_write = gfs2_file_splice_write, 1586 .setlease = simple_nosetlease, 1587 .fallocate = gfs2_fallocate, 1588}; 1589 1590const struct file_operations gfs2_dir_fops = { 1591 .iterate_shared = gfs2_readdir, 1592 .unlocked_ioctl = gfs2_ioctl, 1593 .compat_ioctl = gfs2_compat_ioctl, 1594 .open = gfs2_open, 1595 .release = gfs2_release, 1596 .fsync = gfs2_fsync, 1597 .lock = gfs2_lock, 1598 .flock = gfs2_flock, 1599 .llseek = default_llseek, 1600}; 1601 1602#endif /* CONFIG_GFS2_FS_LOCKING_DLM */ 1603 1604const struct file_operations gfs2_file_fops_nolock = { 1605 .llseek = gfs2_llseek, 1606 .read_iter = gfs2_file_read_iter, 1607 .write_iter = gfs2_file_write_iter, 1608 .iopoll = iocb_bio_iopoll, 1609 .unlocked_ioctl = gfs2_ioctl, 1610 .compat_ioctl = gfs2_compat_ioctl, 1611 .mmap = gfs2_mmap, 1612 .open = gfs2_open, 1613 .release = gfs2_release, 1614 .fsync = gfs2_fsync, 1615 .splice_read = copy_splice_read, 1616 .splice_write = gfs2_file_splice_write, 1617 .setlease = generic_setlease, 1618 .fallocate = gfs2_fallocate, 1619}; 1620 1621const struct file_operations gfs2_dir_fops_nolock = { 1622 .iterate_shared = gfs2_readdir, 1623 .unlocked_ioctl = gfs2_ioctl, 1624 .compat_ioctl = gfs2_compat_ioctl, 1625 .open = gfs2_open, 1626 .release = gfs2_release, 1627 .fsync = gfs2_fsync, 1628 .llseek = default_llseek, 1629}; 1630 1631