1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4  * Copyright (c) 2016-2018 Christoph Hellwig.
34  * Fast and loose check if this write could update the on-disk inode size.
38 	return ioend->io_offset + ioend->io_size >  in xfs_ioend_is_append()
39 		XFS_I(ioend->io_inode)->i_d.di_size;  in xfs_ioend_is_append()
46 	struct xfs_mount	*mp = XFS_I(ioend->io_inode)->i_mount;  in xfs_setfilesize_trans_alloc()
50 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);  in xfs_setfilesize_trans_alloc()
54 	ioend->io_private = tp;  in xfs_setfilesize_trans_alloc()
60 	__sb_writers_release(ioend->io_inode->i_sb, SB_FREEZE_FS);  in xfs_setfilesize_trans_alloc()
65 	current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);  in xfs_setfilesize_trans_alloc()
70  * Update on-disk file size now that data has been written to disk.
91 	ip->i_d.di_size = isize;  in __xfs_setfilesize()
104 	struct xfs_mount	*mp = ip->i_mount;  in xfs_setfilesize()
108 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);  in xfs_setfilesize()
120 	struct xfs_inode	*ip = XFS_I(ioend->io_inode);  in xfs_setfilesize_ioend()
121 	struct xfs_trans	*tp = ioend->io_private;  in xfs_setfilesize_ioend()
128 	current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);  in xfs_setfilesize_ioend()
129 	__sb_writers_acquired(VFS_I(ip)->i_sb, SB_FREEZE_FS);  in xfs_setfilesize_ioend()
137 	return __xfs_setfilesize(ip, tp, ioend->io_offset, ioend->io_size);  in xfs_setfilesize_ioend()
147 	struct xfs_inode	*ip = XFS_I(ioend->io_inode);  in xfs_end_ioend()
148 	xfs_off_t		offset = ioend->io_offset;  in xfs_end_ioend()
149 	size_t			size = ioend->io_size;  in xfs_end_ioend()
156 	 * task-wide nofs context for the following operations.  in xfs_end_ioend()
161 	 * Just clean up the in-memory strutures if the fs has been shut down.  in xfs_end_ioend()
163 	if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {  in xfs_end_ioend()
164 		error = -EIO;  in xfs_end_ioend()
171 	error = blk_status_to_errno(ioend->io_bio->bi_status);  in xfs_end_ioend()
173 		if (ioend->io_flags & IOMAP_F_SHARED)  in xfs_end_ioend()
181 	if (ioend->io_flags & IOMAP_F_SHARED)  in xfs_end_ioend()
183 	else if (ioend->io_type == IOMAP_UNWRITTEN)  in xfs_end_ioend()
186 		ASSERT(!xfs_ioend_is_append(ioend) || ioend->io_private);  in xfs_end_ioend()
189 	if (ioend->io_private)  in xfs_end_ioend()
206 	if (!ioend->io_private) {  in xfs_ioend_merge_private()
207 		ioend->io_private = next->io_private;  in xfs_ioend_merge_private()
208 		next->io_private = NULL;  in xfs_ioend_merge_private()
210 		xfs_setfilesize_ioend(next, -ECANCELED);  in xfs_ioend_merge_private()
225 	spin_lock_irqsave(&ip->i_ioend_lock, flags);  in xfs_end_io()
226 	list_replace_init(&ip->i_ioend_list, &tmp);  in xfs_end_io()
227 	spin_unlock_irqrestore(&ip->i_ioend_lock, flags);  in xfs_end_io()
232 		list_del_init(&ioend->io_list);  in xfs_end_io()
240 	return ioend->io_private ||  in xfs_ioend_needs_workqueue()
241 		ioend->io_type == IOMAP_UNWRITTEN ||  in xfs_ioend_needs_workqueue()
242 		(ioend->io_flags & IOMAP_F_SHARED);  in xfs_ioend_needs_workqueue()
249 	struct iomap_ioend	*ioend = bio->bi_private;  in xfs_end_bio()
250 	struct xfs_inode	*ip = XFS_I(ioend->io_inode);  in xfs_end_bio()
255 	spin_lock_irqsave(&ip->i_ioend_lock, flags);  in xfs_end_bio()
256 	if (list_empty(&ip->i_ioend_list))  in xfs_end_bio()
257 		WARN_ON_ONCE(!queue_work(ip->i_mount->m_unwritten_workqueue,  in xfs_end_bio()
258 					 &ip->i_ioend_work));  in xfs_end_bio()
259 	list_add_tail(&ioend->io_list, &ip->i_ioend_list);  in xfs_end_bio()
260 	spin_unlock_irqrestore(&ip->i_ioend_lock, flags);  in xfs_end_bio()
264  * Fast revalidation of the cached writeback mapping. Return true if the current
265  * mapping is valid, false otherwise.
273 	if (offset < wpc->iomap.offset ||  in xfs_imap_valid()
274 	    offset >= wpc->iomap.offset + wpc->iomap.length)  in xfs_imap_valid()
277 	 * If this is a COW mapping, it is sufficient to check that the mapping  in xfs_imap_valid()
279 	 * can revalidate a COW mapping without updating the data seqno.  in xfs_imap_valid()
281 	if (wpc->iomap.flags & IOMAP_F_SHARED)  in xfs_imap_valid()
285 	 * This is not a COW mapping. Check the sequence number of the data fork  in xfs_imap_valid()
291 	if (XFS_WPC(wpc)->data_seq != READ_ONCE(ip->i_df.if_seq))  in xfs_imap_valid()
294 	    XFS_WPC(wpc)->cow_seq != READ_ONCE(ip->i_cowfp->if_seq))  in xfs_imap_valid()
301  * extent that maps offset_fsb in wpc->iomap.
304  * backing offset_fsb, although it could have moved from the COW to the data
318 		seq = &XFS_WPC(wpc)->cow_seq;  in xfs_convert_blocks()
320 		seq = &XFS_WPC(wpc)->data_seq;  in xfs_convert_blocks()
324 	 * and put the result into wpc->iomap.  Allocate in a loop because it  in xfs_convert_blocks()
330 				&wpc->iomap, seq);  in xfs_convert_blocks()
333 	} while (wpc->iomap.offset + wpc->iomap.length <= offset);  in xfs_convert_blocks()
345 	struct xfs_mount	*mp = ip->i_mount;  in xfs_map_blocks()
357 		return -EIO;  in xfs_map_blocks()
360 	 * COW fork blocks can overlap data fork blocks even if the blocks  in xfs_map_blocks()
362 	 * check for overlap on reflink inodes unless the mapping is already a  in xfs_map_blocks()
387 	ASSERT(ip->i_df.if_format != XFS_DINODE_FMT_BTREE ||  in xfs_map_blocks()
388 	       (ip->i_df.if_flags & XFS_IFEXTENTS));  in xfs_map_blocks()
392 	 * it directly instead of looking up anything in the data fork.  in xfs_map_blocks()
395 	    xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &imap))  in xfs_map_blocks()
398 		XFS_WPC(wpc)->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);  in xfs_map_blocks()
407 	 * ->cow_seq. If the data mapping is still valid, we're done.  in xfs_map_blocks()
419 	if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap))  in xfs_map_blocks()
421 	XFS_WPC(wpc)->data_seq = READ_ONCE(ip->i_df.if_seq);  in xfs_map_blocks()
426 		imap.br_blockcount = imap.br_startoff - offset_fsb;  in xfs_map_blocks()
435 	 * subsequent blocks in the mapping; however, the requirement to treat  in xfs_map_blocks()
440 		imap.br_blockcount = cow_fsb - imap.br_startoff;  in xfs_map_blocks()
447 	xfs_bmbt_to_iomap(ip, &wpc->iomap, &imap, 0);  in xfs_map_blocks()
455 		 * raced with a COW to data fork conversion or truncate.  in xfs_map_blocks()
456 		 * Restart the lookup to catch the extent in the data fork for  in xfs_map_blocks()
460 		if (error == -EAGAIN && whichfork == XFS_COW_FORK && !retries++)  in xfs_map_blocks()
462 		ASSERT(error != -EAGAIN);  in xfs_map_blocks()
469 	 * boundary again to force a re-lookup.  in xfs_map_blocks()
474 		if (cow_offset < wpc->iomap.offset + wpc->iomap.length)  in xfs_map_blocks()
475 			wpc->iomap.length = cow_offset - wpc->iomap.offset;  in xfs_map_blocks()
478 	ASSERT(wpc->iomap.offset <= offset);  in xfs_map_blocks()
479 	ASSERT(wpc->iomap.offset + wpc->iomap.length > offset);  in xfs_map_blocks()
494 	 * task-wide nofs context for the following operations.  in xfs_prepare_ioend()
499 	if (!status && (ioend->io_flags & IOMAP_F_SHARED)) {  in xfs_prepare_ioend()
500 		status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode),  in xfs_prepare_ioend()
501 				ioend->io_offset, ioend->io_size);  in xfs_prepare_ioend()
504 	/* Reserve log space if we might write beyond the on-disk inode size. */  in xfs_prepare_ioend()
506 	    ((ioend->io_flags & IOMAP_F_SHARED) ||  in xfs_prepare_ioend()
507 	     ioend->io_type != IOMAP_UNWRITTEN) &&  in xfs_prepare_ioend()
509 	    !ioend->io_private)  in xfs_prepare_ioend()
515 		ioend->io_bio->bi_end_io = xfs_end_bio;  in xfs_prepare_ioend()
521  * invalidate the page.  If we don't, we leave a stale delalloc mapping on the
525  * they are delalloc, we can do this without needing a transaction. Indeed - if
535 	struct inode		*inode = page->mapping->host;  in xfs_discard_page()
537 	struct xfs_mount	*mp = ip->i_mount;  in xfs_discard_page()
548 			page, ip->i_ino, fileoff);  in xfs_discard_page()
551 			i_blocks_per_page(inode, page) - pageoff_fsb);  in xfs_discard_page()
553 		xfs_alert(mp, "page discard unable to remove delalloc mapping.");  in xfs_discard_page()
555 	iomap_invalidatepage(page, pageoff, PAGE_SIZE - pageoff);  in xfs_discard_page()
576 	struct address_space	*mapping,  in xfs_vm_writepages()  argument
581 	xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);  in xfs_vm_writepages()
582 	return iomap_writepages(mapping, wbc, &wpc.ctx, &xfs_writeback_ops);  in xfs_vm_writepages()
587 	struct address_space	*mapping,  in xfs_dax_writepages()  argument
590 	struct xfs_inode	*ip = XFS_I(mapping->host);  in xfs_dax_writepages()
593 	return dax_writeback_mapping_range(mapping,  in xfs_dax_writepages()
594 			xfs_inode_buftarg(ip)->bt_daxdev, wbc);  in xfs_dax_writepages()
599 	struct address_space	*mapping,  in xfs_vm_bmap()  argument
602 	struct xfs_inode	*ip = XFS_I(mapping->host);  in xfs_vm_bmap()
607 	 * The swap code (ab-)uses ->bmap to get a block mapping and then  in xfs_vm_bmap()
617 	return iomap_bmap(mapping, block, &xfs_read_iomap_ops);  in xfs_vm_bmap()
641 	sis->bdev = xfs_inode_buftarg(XFS_I(file_inode(swap_file)))->bt_bdev;  in xfs_iomap_swapfile_activate()