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_disk_size;  in xfs_ioend_is_append()
43  * Update on-disk file size now that data has been written to disk.
51 	struct xfs_mount	*mp = ip->i_mount;  in xfs_setfilesize()
56 	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp);  in xfs_setfilesize()
70 	ip->i_disk_size = isize;  in xfs_setfilesize()
84 	struct xfs_inode	*ip = XFS_I(ioend->io_inode);  in xfs_end_ioend()
85 	struct xfs_mount	*mp = ip->i_mount;  in xfs_end_ioend()
86 	xfs_off_t		offset = ioend->io_offset;  in xfs_end_ioend()
87 	size_t			size = ioend->io_size;  in xfs_end_ioend()
94 	 * task-wide nofs context for the following operations.  in xfs_end_ioend()
99 	 * Just clean up the in-memory structures if the fs has been shut down.  in xfs_end_ioend()
102 		error = -EIO;  in xfs_end_ioend()
107 	 * Clean up all COW blocks and underlying data fork delalloc blocks on  in xfs_end_ioend()
113 	error = blk_status_to_errno(ioend->io_bio->bi_status);  in xfs_end_ioend()
115 		if (ioend->io_flags & IOMAP_F_SHARED) {  in xfs_end_ioend()
127 	if (ioend->io_flags & IOMAP_F_SHARED)  in xfs_end_ioend()
129 	else if (ioend->io_type == IOMAP_UNWRITTEN)  in xfs_end_ioend()
133 		error = xfs_setfilesize(ip, ioend->io_offset, ioend->io_size);  in xfs_end_ioend()
163 	spin_lock_irqsave(&ip->i_ioend_lock, flags);  in xfs_end_io()
164 	list_replace_init(&ip->i_ioend_list, &tmp);  in xfs_end_io()
165 	spin_unlock_irqrestore(&ip->i_ioend_lock, flags);  in xfs_end_io()
170 		list_del_init(&ioend->io_list);  in xfs_end_io()
181 	struct iomap_ioend	*ioend = bio->bi_private;  in xfs_end_bio()
182 	struct xfs_inode	*ip = XFS_I(ioend->io_inode);  in xfs_end_bio()
185 	spin_lock_irqsave(&ip->i_ioend_lock, flags);  in xfs_end_bio()
186 	if (list_empty(&ip->i_ioend_list))  in xfs_end_bio()
187 		WARN_ON_ONCE(!queue_work(ip->i_mount->m_unwritten_workqueue,  in xfs_end_bio()
188 					 &ip->i_ioend_work));  in xfs_end_bio()
189 	list_add_tail(&ioend->io_list, &ip->i_ioend_list);  in xfs_end_bio()
190 	spin_unlock_irqrestore(&ip->i_ioend_lock, flags);  in xfs_end_bio()
194  * Fast revalidation of the cached writeback mapping. Return true if the current
195  * mapping is valid, false otherwise.
203 	if (offset < wpc->iomap.offset ||  in xfs_imap_valid()
204 	    offset >= wpc->iomap.offset + wpc->iomap.length)  in xfs_imap_valid()
207 	 * If this is a COW mapping, it is sufficient to check that the mapping  in xfs_imap_valid()
209 	 * can revalidate a COW mapping without updating the data seqno.  in xfs_imap_valid()
211 	if (wpc->iomap.flags & IOMAP_F_SHARED)  in xfs_imap_valid()
215 	 * This is not a COW mapping. Check the sequence number of the data fork  in xfs_imap_valid()
221 	if (XFS_WPC(wpc)->data_seq != READ_ONCE(ip->i_df.if_seq))  in xfs_imap_valid()
224 	    XFS_WPC(wpc)->cow_seq != READ_ONCE(ip->i_cowfp->if_seq))  in xfs_imap_valid()
231  * extent that maps offset_fsb in wpc->iomap.
234  * backing offset_fsb, although it could have moved from the COW to the data
248 		seq = &XFS_WPC(wpc)->cow_seq;  in xfs_convert_blocks()
250 		seq = &XFS_WPC(wpc)->data_seq;  in xfs_convert_blocks()
254 	 * and put the result into wpc->iomap.  Allocate in a loop because it  in xfs_convert_blocks()
260 				&wpc->iomap, seq);  in xfs_convert_blocks()
263 	} while (wpc->iomap.offset + wpc->iomap.length <= offset);  in xfs_convert_blocks()
275 	struct xfs_mount	*mp = ip->i_mount;  in xfs_map_blocks()
287 		return -EIO;  in xfs_map_blocks()
290 	 * COW fork blocks can overlap data fork blocks even if the blocks  in xfs_map_blocks()
292 	 * check for overlap on reflink inodes unless the mapping is already a  in xfs_map_blocks()
317 	ASSERT(!xfs_need_iread_extents(&ip->i_df));  in xfs_map_blocks()
321 	 * it directly instead of looking up anything in the data fork.  in xfs_map_blocks()
324 	    xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &imap))  in xfs_map_blocks()
327 		XFS_WPC(wpc)->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);  in xfs_map_blocks()
336 	 * ->cow_seq. If the data mapping is still valid, we're done.  in xfs_map_blocks()
348 	if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap))  in xfs_map_blocks()
350 	XFS_WPC(wpc)->data_seq = READ_ONCE(ip->i_df.if_seq);  in xfs_map_blocks()
355 		imap.br_blockcount = imap.br_startoff - offset_fsb;  in xfs_map_blocks()
364 	 * subsequent blocks in the mapping; however, the requirement to treat  in xfs_map_blocks()
369 		imap.br_blockcount = cow_fsb - imap.br_startoff;  in xfs_map_blocks()
376 	xfs_bmbt_to_iomap(ip, &wpc->iomap, &imap, 0, 0);  in xfs_map_blocks()
384 		 * raced with a COW to data fork conversion or truncate.  in xfs_map_blocks()
385 		 * Restart the lookup to catch the extent in the data fork for  in xfs_map_blocks()
389 		if (error == -EAGAIN && whichfork == XFS_COW_FORK && !retries++)  in xfs_map_blocks()
391 		ASSERT(error != -EAGAIN);  in xfs_map_blocks()
398 	 * boundary again to force a re-lookup.  in xfs_map_blocks()
403 		if (cow_offset < wpc->iomap.offset + wpc->iomap.length)  in xfs_map_blocks()
404 			wpc->iomap.length = cow_offset - wpc->iomap.offset;  in xfs_map_blocks()
407 	ASSERT(wpc->iomap.offset <= offset);  in xfs_map_blocks()
408 	ASSERT(wpc->iomap.offset + wpc->iomap.length > offset);  in xfs_map_blocks()
423 	 * task-wide nofs context for the following operations.  in xfs_prepare_ioend()
428 	if (!status && (ioend->io_flags & IOMAP_F_SHARED)) {  in xfs_prepare_ioend()
429 		status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode),  in xfs_prepare_ioend()
430 				ioend->io_offset, ioend->io_size);  in xfs_prepare_ioend()
436 	if (xfs_ioend_is_append(ioend) || ioend->io_type == IOMAP_UNWRITTEN ||  in xfs_prepare_ioend()
437 	    (ioend->io_flags & IOMAP_F_SHARED))  in xfs_prepare_ioend()
438 		ioend->io_bio->bi_end_io = xfs_end_bio;  in xfs_prepare_ioend()
444  * invalidate the page.  If we don't, we leave a stale delalloc mapping on the
448  * they are delalloc, we can do this without needing a transaction. Indeed - if
458 	struct inode		*inode = folio->mapping->host;  in xfs_discard_folio()
460 	struct xfs_mount	*mp = ip->i_mount;  in xfs_discard_folio()
471 			folio, ip->i_ino, pos);  in xfs_discard_folio()
474 			i_blocks_per_folio(inode, folio) - pageoff_fsb);  in xfs_discard_folio()
476 		xfs_alert(mp, "page discard unable to remove delalloc mapping.");  in xfs_discard_folio()
487 	struct address_space	*mapping,  in xfs_vm_writepages()  argument
493 	 * Writing back data in a transaction context can result in recursive  in xfs_vm_writepages()
496 	if (WARN_ON_ONCE(current->journal_info))  in xfs_vm_writepages()
499 	xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);  in xfs_vm_writepages()
500 	return iomap_writepages(mapping, wbc, &wpc.ctx, &xfs_writeback_ops);  in xfs_vm_writepages()
505 	struct address_space	*mapping,  in xfs_dax_writepages()  argument
508 	struct xfs_inode	*ip = XFS_I(mapping->host);  in xfs_dax_writepages()
511 	return dax_writeback_mapping_range(mapping,  in xfs_dax_writepages()
512 			xfs_inode_buftarg(ip)->bt_daxdev, wbc);  in xfs_dax_writepages()
517 	struct address_space	*mapping,  in xfs_vm_bmap()  argument
520 	struct xfs_inode	*ip = XFS_I(mapping->host);  in xfs_vm_bmap()
525 	 * The swap code (ab-)uses ->bmap to get a block mapping and then  in xfs_vm_bmap()
535 	return iomap_bmap(mapping, block, &xfs_read_iomap_ops);  in xfs_vm_bmap()
559 	sis->bdev = xfs_inode_buftarg(XFS_I(file_inode(swap_file)))->bt_bdev;  in xfs_iomap_swapfile_activate()