diff options
Diffstat (limited to 'fs/xfs/xfs_aops.c')
| -rw-r--r-- | fs/xfs/xfs_aops.c | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index ca6903726689..8eb3ba3d4d00 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -1,19 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "xfs.h" #include "xfs_shared.h" @@ -543,8 +531,19 @@ xfs_submit_ioend( { /* Convert CoW extents to regular */ if (!status && ioend->io_type == XFS_IO_COW) { + /* + * Yuk. This can do memory allocation, but is not a + * transactional operation so everything is done in GFP_KERNEL + * context. That can deadlock, because we hold pages in + * writeback state and GFP_KERNEL allocations can block on them. + * Hence we must operate in nofs conditions here. + */ + unsigned nofs_flag; + + nofs_flag = memalloc_nofs_save(); status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode), ioend->io_offset, ioend->io_size); + memalloc_nofs_restore(nofs_flag); } /* Reserve log space if we might write beyond the on-disk inode size. */ |