1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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>
16 #include <linux/mount.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/falloc.h>
20 #include <linux/swap.h>
21 #include <linux/crc32.h>
22 #include <linux/writeback.h>
23 #include <linux/uaccess.h>
24 #include <linux/dlm.h>
25 #include <linux/dlm_plock.h>
26 #include <linux/delay.h>
27 #include <linux/backing-dev.h>
45 * gfs2_llseek - seek to a location in a file
48 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
50 * SEEK_END requires the glock for the file because it references the
53 * Returns: The new offset, or errno
56 static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
58 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
59 struct gfs2_holder i_gh;
64 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
67 error = generic_file_llseek(file, offset, whence);
68 gfs2_glock_dq_uninit(&i_gh);
73 error = gfs2_seek_data(file, offset);
77 error = gfs2_seek_hole(file, offset);
83 * These don't reference inode->i_size and don't depend on the
84 * block mapping, so we don't need the glock.
86 error = generic_file_llseek(file, offset, whence);
96 * gfs2_readdir - Iterator for a directory
97 * @file: The directory to read from
98 * @ctx: What to feed directory entries to
103 static int gfs2_readdir(struct file *file, struct dir_context *ctx)
105 struct inode *dir = file->f_mapping->host;
106 struct gfs2_inode *dip = GFS2_I(dir);
107 struct gfs2_holder d_gh;
110 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
114 error = gfs2_dir_read(dir, ctx, &file->f_ra);
116 gfs2_glock_dq_uninit(&d_gh);
124 * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories,
125 * and to GFS2_DIF_JDATA for non-directories.
130 } fsflag_gfs2flag[] = {
131 {FS_SYNC_FL, GFS2_DIF_SYNC},
132 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
133 {FS_APPEND_FL, GFS2_DIF_APPENDONLY},
134 {FS_NOATIME_FL, GFS2_DIF_NOATIME},
135 {FS_INDEX_FL, GFS2_DIF_EXHASH},
136 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
137 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
140 static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags)
145 if (S_ISDIR(inode->i_mode))
146 gfsflags &= ~GFS2_DIF_JDATA;
148 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
150 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
151 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
152 fsflags |= fsflag_gfs2flag[i].fsflag;
156 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
158 struct inode *inode = file_inode(filp);
159 struct gfs2_inode *ip = GFS2_I(inode);
160 struct gfs2_holder gh;
164 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
165 error = gfs2_glock_nq(&gh);
169 fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
171 if (put_user(fsflags, ptr))
176 gfs2_holder_uninit(&gh);
180 void gfs2_set_inode_flags(struct inode *inode)
182 struct gfs2_inode *ip = GFS2_I(inode);
183 unsigned int flags = inode->i_flags;
185 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
186 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
188 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
189 flags |= S_IMMUTABLE;
190 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
192 if (ip->i_diskflags & GFS2_DIF_NOATIME)
194 if (ip->i_diskflags & GFS2_DIF_SYNC)
196 inode->i_flags = flags;
199 /* Flags that can be set by user space */
200 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
201 GFS2_DIF_IMMUTABLE| \
202 GFS2_DIF_APPENDONLY| \
206 GFS2_DIF_INHERIT_JDATA)
209 * do_gfs2_set_flags - set flags on an inode
210 * @filp: file pointer
211 * @reqflags: The flags to set
212 * @mask: Indicates which flags are valid
213 * @fsflags: The FS_* inode flags passed in
216 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
219 struct inode *inode = file_inode(filp);
220 struct gfs2_inode *ip = GFS2_I(inode);
221 struct gfs2_sbd *sdp = GFS2_SB(inode);
222 struct buffer_head *bh;
223 struct gfs2_holder gh;
225 u32 new_flags, flags, oldflags;
227 error = mnt_want_write_file(filp);
231 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
235 oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
236 error = vfs_ioc_setflags_prepare(inode, oldflags, fsflags);
241 if (!inode_owner_or_capable(inode))
245 flags = ip->i_diskflags;
246 new_flags = (flags & ~mask) | (reqflags & mask);
247 if ((new_flags ^ flags) == 0)
251 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
253 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
255 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
256 !capable(CAP_LINUX_IMMUTABLE))
258 if (!IS_IMMUTABLE(inode)) {
259 error = gfs2_permission(inode, MAY_WRITE);
263 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
264 if (new_flags & GFS2_DIF_JDATA)
265 gfs2_log_flush(sdp, ip->i_gl,
266 GFS2_LOG_HEAD_FLUSH_NORMAL |
268 error = filemap_fdatawrite(inode->i_mapping);
271 error = filemap_fdatawait(inode->i_mapping);
274 if (new_flags & GFS2_DIF_JDATA)
275 gfs2_ordered_del_inode(ip);
277 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
280 error = gfs2_meta_inode_buffer(ip, &bh);
283 inode->i_ctime = current_time(inode);
284 gfs2_trans_add_meta(ip->i_gl, bh);
285 ip->i_diskflags = new_flags;
286 gfs2_dinode_out(ip, bh->b_data);
288 gfs2_set_inode_flags(inode);
289 gfs2_set_aops(inode);
293 gfs2_glock_dq_uninit(&gh);
295 mnt_drop_write_file(filp);
299 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
301 struct inode *inode = file_inode(filp);
302 u32 fsflags, gfsflags = 0;
306 if (get_user(fsflags, ptr))
309 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
310 if (fsflags & fsflag_gfs2flag[i].fsflag) {
311 fsflags &= ~fsflag_gfs2flag[i].fsflag;
312 gfsflags |= fsflag_gfs2flag[i].gfsflag;
315 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
318 mask = GFS2_FLAGS_USER_SET;
319 if (S_ISDIR(inode->i_mode)) {
320 mask &= ~GFS2_DIF_JDATA;
322 /* The GFS2_DIF_TOPDIR flag is only valid for directories. */
323 if (gfsflags & GFS2_DIF_TOPDIR)
325 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
328 return do_gfs2_set_flags(filp, gfsflags, mask, fsflags);
331 static int gfs2_getlabel(struct file *filp, char __user *label)
333 struct inode *inode = file_inode(filp);
334 struct gfs2_sbd *sdp = GFS2_SB(inode);
336 if (copy_to_user(label, sdp->sd_sb.sb_locktable, GFS2_LOCKNAME_LEN))
342 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
345 case FS_IOC_GETFLAGS:
346 return gfs2_get_flags(filp, (u32 __user *)arg);
347 case FS_IOC_SETFLAGS:
348 return gfs2_set_flags(filp, (u32 __user *)arg);
350 return gfs2_fitrim(filp, (void __user *)arg);
351 case FS_IOC_GETFSLABEL:
352 return gfs2_getlabel(filp, (char __user *)arg);
359 static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
362 /* These are just misnamed, they actually get/put from/to user an int */
363 case FS_IOC32_GETFLAGS:
364 cmd = FS_IOC_GETFLAGS;
366 case FS_IOC32_SETFLAGS:
367 cmd = FS_IOC_SETFLAGS;
369 /* Keep this list in sync with gfs2_ioctl */
371 case FS_IOC_GETFSLABEL:
377 return gfs2_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
380 #define gfs2_compat_ioctl NULL
384 * gfs2_size_hint - Give a hint to the size of a write request
385 * @filep: The struct file
386 * @offset: The file offset of the write
387 * @size: The length of the write
389 * When we are about to do a write, this function records the total
390 * write size in order to provide a suitable hint to the lower layers
391 * about how many blocks will be required.
395 static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
397 struct inode *inode = file_inode(filep);
398 struct gfs2_sbd *sdp = GFS2_SB(inode);
399 struct gfs2_inode *ip = GFS2_I(inode);
400 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
401 int hint = min_t(size_t, INT_MAX, blks);
403 if (hint > atomic_read(&ip->i_sizehint))
404 atomic_set(&ip->i_sizehint, hint);
408 * gfs2_allocate_page_backing - Allocate blocks for a write fault
409 * @page: The (locked) page to allocate backing for
411 * We try to allocate all the blocks required for the page in one go. This
412 * might fail for various reasons, so we keep trying until all the blocks to
413 * back this page are allocated. If some of the blocks are already allocated,
416 static int gfs2_allocate_page_backing(struct page *page)
418 u64 pos = page_offset(page);
419 u64 size = PAGE_SIZE;
422 struct iomap iomap = { };
424 if (gfs2_iomap_get_alloc(page->mapping->host, pos, 1, &iomap))
427 iomap.length = min(iomap.length, size);
428 size -= iomap.length;
436 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
437 * @vma: The virtual memory area
438 * @vmf: The virtual memory fault containing the page to become writable
440 * When the page becomes writable, we need to ensure that we have
441 * blocks allocated on disk to back that page.
444 static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
446 struct page *page = vmf->page;
447 struct inode *inode = file_inode(vmf->vma->vm_file);
448 struct gfs2_inode *ip = GFS2_I(inode);
449 struct gfs2_sbd *sdp = GFS2_SB(inode);
450 struct gfs2_alloc_parms ap = { .aflags = 0, };
451 unsigned long last_index;
452 u64 pos = page_offset(page);
453 unsigned int data_blocks, ind_blocks, rblocks;
454 struct gfs2_holder gh;
458 sb_start_pagefault(inode->i_sb);
460 ret = gfs2_rsqa_alloc(ip);
464 gfs2_size_hint(vmf->vma->vm_file, pos, PAGE_SIZE);
466 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
467 ret = gfs2_glock_nq(&gh);
471 /* Update file times before taking page lock */
472 file_update_time(vmf->vma->vm_file);
474 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
475 set_bit(GIF_SW_PAGED, &ip->i_flags);
477 if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) {
479 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
486 ret = gfs2_rindex_update(sdp);
490 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
491 ap.target = data_blocks + ind_blocks;
492 ret = gfs2_quota_lock_check(ip, &ap);
495 ret = gfs2_inplace_reserve(ip, &ap);
497 goto out_quota_unlock;
499 rblocks = RES_DINODE + ind_blocks;
500 if (gfs2_is_jdata(ip))
501 rblocks += data_blocks ? data_blocks : 1;
502 if (ind_blocks || data_blocks) {
503 rblocks += RES_STATFS + RES_QUOTA;
504 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
506 ret = gfs2_trans_begin(sdp, rblocks, 0);
512 size = i_size_read(inode);
513 last_index = (size - 1) >> PAGE_SHIFT;
514 /* Check page index against inode size */
515 if (size == 0 || (page->index > last_index))
519 /* If truncated, we must retry the operation, we may have raced
520 * with the glock demotion code.
522 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
525 /* Unstuff, if required, and allocate backing blocks for page */
527 if (gfs2_is_stuffed(ip))
528 ret = gfs2_unstuff_dinode(ip, page);
530 ret = gfs2_allocate_page_backing(page);
537 gfs2_inplace_release(ip);
539 gfs2_quota_unlock(ip);
543 gfs2_holder_uninit(&gh);
545 set_page_dirty(page);
546 wait_for_stable_page(page);
549 sb_end_pagefault(inode->i_sb);
550 return block_page_mkwrite_return(ret);
553 static const struct vm_operations_struct gfs2_vm_ops = {
554 .fault = filemap_fault,
555 .map_pages = filemap_map_pages,
556 .page_mkwrite = gfs2_page_mkwrite,
561 * @file: The file to map
562 * @vma: The VMA which described the mapping
564 * There is no need to get a lock here unless we should be updating
565 * atime. We ignore any locking errors since the only consequence is
566 * a missed atime update (which will just be deferred until later).
571 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
573 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
575 if (!(file->f_flags & O_NOATIME) &&
576 !IS_NOATIME(&ip->i_inode)) {
577 struct gfs2_holder i_gh;
580 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
584 /* grab lock to update inode */
585 gfs2_glock_dq_uninit(&i_gh);
588 vma->vm_ops = &gfs2_vm_ops;
594 * gfs2_open_common - This is common to open and atomic_open
595 * @inode: The inode being opened
596 * @file: The file being opened
598 * This maybe called under a glock or not depending upon how it has
599 * been called. We must always be called under a glock for regular
600 * files, however. For other file types, it does not matter whether
601 * we hold the glock or not.
603 * Returns: Error code or 0 for success
606 int gfs2_open_common(struct inode *inode, struct file *file)
608 struct gfs2_file *fp;
611 if (S_ISREG(inode->i_mode)) {
612 ret = generic_file_open(inode, file);
617 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
621 mutex_init(&fp->f_fl_mutex);
623 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
624 file->private_data = fp;
629 * gfs2_open - open a file
630 * @inode: the inode to open
631 * @file: the struct file for this opening
633 * After atomic_open, this function is only used for opening files
634 * which are already cached. We must still get the glock for regular
635 * files to ensure that we have the file size uptodate for the large
636 * file check which is in the common code. That is only an issue for
637 * regular files though.
642 static int gfs2_open(struct inode *inode, struct file *file)
644 struct gfs2_inode *ip = GFS2_I(inode);
645 struct gfs2_holder i_gh;
647 bool need_unlock = false;
649 if (S_ISREG(ip->i_inode.i_mode)) {
650 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
657 error = gfs2_open_common(inode, file);
660 gfs2_glock_dq_uninit(&i_gh);
666 * gfs2_release - called to close a struct file
667 * @inode: the inode the struct file belongs to
668 * @file: the struct file being closed
673 static int gfs2_release(struct inode *inode, struct file *file)
675 struct gfs2_inode *ip = GFS2_I(inode);
677 kfree(file->private_data);
678 file->private_data = NULL;
680 if (!(file->f_mode & FMODE_WRITE))
683 gfs2_rsqa_delete(ip, &inode->i_writecount);
688 * gfs2_fsync - sync the dirty data for a file (across the cluster)
689 * @file: the file that points to the dentry
690 * @start: the start position in the file to sync
691 * @end: the end position in the file to sync
692 * @datasync: set if we can ignore timestamp changes
694 * We split the data flushing here so that we don't wait for the data
695 * until after we've also sent the metadata to disk. Note that for
696 * data=ordered, we will write & wait for the data at the log flush
697 * stage anyway, so this is unlikely to make much of a difference
698 * except in the data=writeback case.
700 * If the fdatawrite fails due to any reason except -EIO, we will
701 * continue the remainder of the fsync, although we'll still report
702 * the error at the end. This is to match filemap_write_and_wait_range()
708 static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
711 struct address_space *mapping = file->f_mapping;
712 struct inode *inode = mapping->host;
713 int sync_state = inode->i_state & I_DIRTY_ALL;
714 struct gfs2_inode *ip = GFS2_I(inode);
715 int ret = 0, ret1 = 0;
717 if (mapping->nrpages) {
718 ret1 = filemap_fdatawrite_range(mapping, start, end);
723 if (!gfs2_is_jdata(ip))
724 sync_state &= ~I_DIRTY_PAGES;
726 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
729 ret = sync_inode_metadata(inode, 1);
732 if (gfs2_is_jdata(ip))
733 ret = file_write_and_wait(file);
736 gfs2_ail_flush(ip->i_gl, 1);
739 if (mapping->nrpages)
740 ret = file_fdatawait_range(file, start, end);
742 return ret ? ret : ret1;
745 static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
747 struct file *file = iocb->ki_filp;
748 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
749 size_t count = iov_iter_count(to);
750 struct gfs2_holder gh;
754 return 0; /* skip atime */
756 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
757 ret = gfs2_glock_nq(&gh);
761 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL,
762 is_sync_kiocb(iocb));
766 gfs2_holder_uninit(&gh);
770 static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
772 struct file *file = iocb->ki_filp;
773 struct inode *inode = file->f_mapping->host;
774 struct gfs2_inode *ip = GFS2_I(inode);
775 size_t len = iov_iter_count(from);
776 loff_t offset = iocb->ki_pos;
777 struct gfs2_holder gh;
781 * Deferred lock, even if its a write, since we do no allocation on
782 * this path. All we need to change is the atime, and this lock mode
783 * ensures that other nodes have flushed their buffered read caches
784 * (i.e. their page cache entries for this inode). We do not,
785 * unfortunately, have the option of only flushing a range like the
788 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
789 ret = gfs2_glock_nq(&gh);
793 /* Silently fall back to buffered I/O when writing beyond EOF */
794 if (offset + len > i_size_read(&ip->i_inode))
797 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL,
798 is_sync_kiocb(iocb));
803 gfs2_holder_uninit(&gh);
807 static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
811 if (iocb->ki_flags & IOCB_DIRECT) {
812 ret = gfs2_file_direct_read(iocb, to);
813 if (likely(ret != -ENOTBLK))
815 iocb->ki_flags &= ~IOCB_DIRECT;
817 return generic_file_read_iter(iocb, to);
821 * gfs2_file_write_iter - Perform a write to a file
822 * @iocb: The io context
823 * @from: The data to write
825 * We have to do a lock/unlock here to refresh the inode size for
826 * O_APPEND writes, otherwise we can land up writing at the wrong
827 * offset. There is still a race, but provided the app is using its
828 * own file locking, this will make O_APPEND work as expected.
832 static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
834 struct file *file = iocb->ki_filp;
835 struct inode *inode = file_inode(file);
836 struct gfs2_inode *ip = GFS2_I(inode);
837 ssize_t written = 0, ret;
839 ret = gfs2_rsqa_alloc(ip);
843 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
845 if (iocb->ki_flags & IOCB_APPEND) {
846 struct gfs2_holder gh;
848 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
851 gfs2_glock_dq_uninit(&gh);
855 ret = generic_write_checks(iocb, from);
859 /* We can write back this queue in page reclaim */
860 current->backing_dev_info = inode_to_bdi(inode);
862 ret = file_remove_privs(file);
866 ret = file_update_time(file);
870 if (iocb->ki_flags & IOCB_DIRECT) {
871 struct address_space *mapping = file->f_mapping;
875 written = gfs2_file_direct_write(iocb, from);
876 if (written < 0 || !iov_iter_count(from))
879 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
880 if (unlikely(ret < 0))
885 * We need to ensure that the page cache pages are written to
886 * disk and invalidated to preserve the expected O_DIRECT
890 endbyte = pos + buffered - 1;
891 ret = filemap_write_and_wait_range(mapping, pos, endbyte);
893 iocb->ki_pos += buffered;
895 invalidate_mapping_pages(mapping,
897 endbyte >> PAGE_SHIFT);
900 * We don't know how much we wrote, so just return
901 * the number of bytes which were direct-written
905 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
911 current->backing_dev_info = NULL;
914 if (likely(ret > 0)) {
915 /* Handle various SYNC-type writes */
916 ret = generic_write_sync(iocb, ret);
918 return written ? written : ret;
921 static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
924 struct super_block *sb = inode->i_sb;
925 struct gfs2_inode *ip = GFS2_I(inode);
926 loff_t end = offset + len;
927 struct buffer_head *dibh;
930 error = gfs2_meta_inode_buffer(ip, &dibh);
934 gfs2_trans_add_meta(ip->i_gl, dibh);
936 if (gfs2_is_stuffed(ip)) {
937 error = gfs2_unstuff_dinode(ip, NULL);
942 while (offset < end) {
943 struct iomap iomap = { };
945 error = gfs2_iomap_get_alloc(inode, offset, end - offset,
949 offset = iomap.offset + iomap.length;
950 if (!(iomap.flags & IOMAP_F_NEW))
952 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
953 iomap.length >> inode->i_blkbits,
956 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
965 * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
966 * blocks, determine how many bytes can be written.
967 * @ip: The inode in question.
968 * @len: Max cap of bytes. What we return in *len must be <= this.
969 * @data_blocks: Compute and return the number of data blocks needed
970 * @ind_blocks: Compute and return the number of indirect blocks needed
971 * @max_blocks: The total blocks available to work with.
973 * Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
975 static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
976 unsigned int *data_blocks, unsigned int *ind_blocks,
977 unsigned int max_blocks)
980 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
981 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
983 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
984 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
988 *data_blocks = max_data;
989 *ind_blocks = max_blocks - max_data;
990 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
993 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
997 static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
999 struct inode *inode = file_inode(file);
1000 struct gfs2_sbd *sdp = GFS2_SB(inode);
1001 struct gfs2_inode *ip = GFS2_I(inode);
1002 struct gfs2_alloc_parms ap = { .aflags = 0, };
1003 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
1004 loff_t bytes, max_bytes, max_blks;
1006 const loff_t pos = offset;
1007 const loff_t count = len;
1008 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
1009 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
1010 loff_t max_chunk_size = UINT_MAX & bsize_mask;
1012 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
1014 offset &= bsize_mask;
1016 len = next - offset;
1017 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
1020 bytes &= bsize_mask;
1022 bytes = sdp->sd_sb.sb_bsize;
1024 gfs2_size_hint(file, offset, len);
1026 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
1027 ap.min_target = data_blocks + ind_blocks;
1032 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
1038 /* We need to determine how many bytes we can actually
1039 * fallocate without exceeding quota or going over the
1040 * end of the fs. We start off optimistically by assuming
1041 * we can write max_bytes */
1042 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
1044 /* Since max_bytes is most likely a theoretical max, we
1045 * calculate a more realistic 'bytes' to serve as a good
1046 * starting point for the number of bytes we may be able
1048 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1049 ap.target = data_blocks + ind_blocks;
1051 error = gfs2_quota_lock_check(ip, &ap);
1054 /* ap.allowed tells us how many blocks quota will allow
1055 * us to write. Check if this reduces max_blks */
1056 max_blks = UINT_MAX;
1058 max_blks = ap.allowed;
1060 error = gfs2_inplace_reserve(ip, &ap);
1064 /* check if the selected rgrp limits our max_blks further */
1065 if (ap.allowed && ap.allowed < max_blks)
1066 max_blks = ap.allowed;
1068 /* Almost done. Calculate bytes that can be written using
1069 * max_blks. We also recompute max_bytes, data_blocks and
1071 calc_max_reserv(ip, &max_bytes, &data_blocks,
1072 &ind_blocks, max_blks);
1074 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1075 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
1076 if (gfs2_is_jdata(ip))
1077 rblocks += data_blocks ? data_blocks : 1;
1079 error = gfs2_trans_begin(sdp, rblocks,
1080 PAGE_SIZE >> inode->i_blkbits);
1082 goto out_trans_fail;
1084 error = fallocate_chunk(inode, offset, max_bytes, mode);
1085 gfs2_trans_end(sdp);
1088 goto out_trans_fail;
1091 offset += max_bytes;
1092 gfs2_inplace_release(ip);
1093 gfs2_quota_unlock(ip);
1096 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size)
1097 i_size_write(inode, pos + count);
1098 file_update_time(file);
1099 mark_inode_dirty(inode);
1101 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1102 return vfs_fsync_range(file, pos, pos + count - 1,
1103 (file->f_flags & __O_SYNC) ? 0 : 1);
1107 gfs2_inplace_release(ip);
1109 gfs2_quota_unlock(ip);
1113 static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1115 struct inode *inode = file_inode(file);
1116 struct gfs2_sbd *sdp = GFS2_SB(inode);
1117 struct gfs2_inode *ip = GFS2_I(inode);
1118 struct gfs2_holder gh;
1121 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
1123 /* fallocate is needed by gfs2_grow to reserve space in the rindex */
1124 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
1129 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1130 ret = gfs2_glock_nq(&gh);
1134 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1135 (offset + len) > inode->i_size) {
1136 ret = inode_newsize_ok(inode, offset + len);
1141 ret = get_write_access(inode);
1145 if (mode & FALLOC_FL_PUNCH_HOLE) {
1146 ret = __gfs2_punch_hole(file, offset, len);
1148 ret = gfs2_rsqa_alloc(ip);
1152 ret = __gfs2_fallocate(file, mode, offset, len);
1155 gfs2_rs_deltree(&ip->i_res);
1159 put_write_access(inode);
1163 gfs2_holder_uninit(&gh);
1164 inode_unlock(inode);
1168 static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1169 struct file *out, loff_t *ppos,
1170 size_t len, unsigned int flags)
1173 struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
1175 error = gfs2_rsqa_alloc(ip);
1177 return (ssize_t)error;
1179 gfs2_size_hint(out, *ppos, len);
1181 return iter_file_splice_write(pipe, out, ppos, len, flags);
1184 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1187 * gfs2_lock - acquire/release a posix lock on a file
1188 * @file: the file pointer
1189 * @cmd: either modify or retrieve lock state, possibly wait
1190 * @fl: type and range of lock
1195 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1197 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1198 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
1199 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1201 if (!(fl->fl_flags & FL_POSIX))
1203 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
1206 if (cmd == F_CANCELLK) {
1209 fl->fl_type = F_UNLCK;
1211 if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) {
1212 if (fl->fl_type == F_UNLCK)
1213 locks_lock_file_wait(file, fl);
1217 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
1218 else if (fl->fl_type == F_UNLCK)
1219 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
1221 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
1224 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1226 struct gfs2_file *fp = file->private_data;
1227 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1228 struct gfs2_inode *ip = GFS2_I(file_inode(file));
1229 struct gfs2_glock *gl;
1235 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
1236 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
1238 mutex_lock(&fp->f_fl_mutex);
1240 if (gfs2_holder_initialized(fl_gh)) {
1241 struct file_lock request;
1242 if (fl_gh->gh_state == state)
1244 locks_init_lock(&request);
1245 request.fl_type = F_UNLCK;
1246 request.fl_flags = FL_FLOCK;
1247 locks_lock_file_wait(file, &request);
1248 gfs2_glock_dq(fl_gh);
1249 gfs2_holder_reinit(state, flags, fl_gh);
1251 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1252 &gfs2_flock_glops, CREATE, &gl);
1255 gfs2_holder_init(gl, state, flags, fl_gh);
1258 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1259 error = gfs2_glock_nq(fl_gh);
1260 if (error != GLR_TRYFAILED)
1262 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1263 fl_gh->gh_error = 0;
1267 gfs2_holder_uninit(fl_gh);
1268 if (error == GLR_TRYFAILED)
1271 error = locks_lock_file_wait(file, fl);
1272 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1276 mutex_unlock(&fp->f_fl_mutex);
1280 static void do_unflock(struct file *file, struct file_lock *fl)
1282 struct gfs2_file *fp = file->private_data;
1283 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1285 mutex_lock(&fp->f_fl_mutex);
1286 locks_lock_file_wait(file, fl);
1287 if (gfs2_holder_initialized(fl_gh)) {
1288 gfs2_glock_dq(fl_gh);
1289 gfs2_holder_uninit(fl_gh);
1291 mutex_unlock(&fp->f_fl_mutex);
1295 * gfs2_flock - acquire/release a flock lock on a file
1296 * @file: the file pointer
1297 * @cmd: either modify or retrieve lock state, possibly wait
1298 * @fl: type and range of lock
1303 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1305 if (!(fl->fl_flags & FL_FLOCK))
1307 if (fl->fl_type & LOCK_MAND)
1310 if (fl->fl_type == F_UNLCK) {
1311 do_unflock(file, fl);
1314 return do_flock(file, cmd, fl);
1318 const struct file_operations gfs2_file_fops = {
1319 .llseek = gfs2_llseek,
1320 .read_iter = gfs2_file_read_iter,
1321 .write_iter = gfs2_file_write_iter,
1322 .iopoll = iomap_dio_iopoll,
1323 .unlocked_ioctl = gfs2_ioctl,
1324 .compat_ioctl = gfs2_compat_ioctl,
1327 .release = gfs2_release,
1328 .fsync = gfs2_fsync,
1330 .flock = gfs2_flock,
1331 .splice_read = generic_file_splice_read,
1332 .splice_write = gfs2_file_splice_write,
1333 .setlease = simple_nosetlease,
1334 .fallocate = gfs2_fallocate,
1337 const struct file_operations gfs2_dir_fops = {
1338 .iterate_shared = gfs2_readdir,
1339 .unlocked_ioctl = gfs2_ioctl,
1340 .compat_ioctl = gfs2_compat_ioctl,
1342 .release = gfs2_release,
1343 .fsync = gfs2_fsync,
1345 .flock = gfs2_flock,
1346 .llseek = default_llseek,
1349 #endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1351 const struct file_operations gfs2_file_fops_nolock = {
1352 .llseek = gfs2_llseek,
1353 .read_iter = gfs2_file_read_iter,
1354 .write_iter = gfs2_file_write_iter,
1355 .iopoll = iomap_dio_iopoll,
1356 .unlocked_ioctl = gfs2_ioctl,
1357 .compat_ioctl = gfs2_compat_ioctl,
1360 .release = gfs2_release,
1361 .fsync = gfs2_fsync,
1362 .splice_read = generic_file_splice_read,
1363 .splice_write = gfs2_file_splice_write,
1364 .setlease = generic_setlease,
1365 .fallocate = gfs2_fallocate,
1368 const struct file_operations gfs2_dir_fops_nolock = {
1369 .iterate_shared = gfs2_readdir,
1370 .unlocked_ioctl = gfs2_ioctl,
1371 .compat_ioctl = gfs2_compat_ioctl,
1373 .release = gfs2_release,
1374 .fsync = gfs2_fsync,
1375 .llseek = default_llseek,