Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 067/101] ext4: force inode writes when nfsd calls commit_metadata() | Date | Mon, 7 Jan 2019 13:32:55 +0100 |
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4.14-stable review patch. If anyone has any objections, please let me know.
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From: Theodore Ts'o <tytso@mit.edu>
commit fde872682e175743e0c3ef939c89e3c6008a1529 upstream.
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 <tytso@mit.edu> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/ext4/super.c | 11 +++++++++++ include/trace/events/ext4.h | 20 ++++++++++++++++++++ 2 files changed, 31 insertions(+)
--- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1153,6 +1153,16 @@ static struct dentry *ext4_fh_to_parent( 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 @@ -1361,6 +1371,7 @@ static const struct export_operations ex .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 { --- a/include/trace/events/ext4.h +++ b/include/trace/events/ext4.h @@ -225,6 +225,26 @@ TRACE_EVENT(ext4_drop_inode, (unsigned long) __entry->ino, __entry->drop) ); +TRACE_EVENT(ext4_nfs_commit_metadata, + TP_PROTO(struct inode *inode), + + TP_ARGS(inode), + + TP_STRUCT__entry( + __field( dev_t, dev ) + __field( ino_t, ino ) + ), + + TP_fast_assign( + __entry->dev = inode->i_sb->s_dev; + __entry->ino = inode->i_ino; + ), + + TP_printk("dev %d,%d ino %lu", + MAJOR(__entry->dev), MINOR(__entry->dev), + (unsigned long) __entry->ino) +); + TRACE_EVENT(ext4_mark_inode_dirty, TP_PROTO(struct inode *inode, unsigned long IP),
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