From fde872682e175743e0c3ef939c89e3c6008a1529 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Wed, 19 Dec 2018 14:07:58 -0500 Subject: ext4: force inode writes when nfsd calls commit_metadata() Some time back, nfsd switched from calling vfs_fsync() to using a new commit_metadata() hook in export_operations(). If the file system did not provide a commit_metadata() hook, it fell back to using sync_inode_metadata(). Unfortunately doesn't work on all file systems. In particular, it doesn't work on ext4 due to how the inode gets journalled --- the VFS writeback code will not always call ext4_write_inode(). So we need to provide our own ext4_nfs_commit_metdata() method which calls ext4_write_inode() directly. Google-Bug-Id: 121195940 Signed-off-by: Theodore Ts'o Cc: stable@kernel.org --- fs/ext4/super.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'fs/ext4') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index fc9071081600..d6c142d73d99 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1202,6 +1202,16 @@ static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, ext4_nfs_get_inode); } +static int ext4_nfs_commit_metadata(struct inode *inode) +{ + struct writeback_control wbc = { + .sync_mode = WB_SYNC_ALL + }; + + trace_ext4_nfs_commit_metadata(inode); + return ext4_write_inode(inode, &wbc); +} + /* * Try to release metadata pages (indirect blocks, directories) which are * mapped via the block device. Since these pages could have journal heads @@ -1406,6 +1416,7 @@ static const struct export_operations ext4_export_ops = { .fh_to_dentry = ext4_fh_to_dentry, .fh_to_parent = ext4_fh_to_parent, .get_parent = ext4_get_parent, + .commit_metadata = ext4_nfs_commit_metadata, }; enum { -- cgit v1.2.3-59-g8ed1b