fuse_fsync_common() may skip fuse_flush_mtime() if datasync=1 because
mtime is pure metadata and the content of file doesn't depend on it.

https://jira.sw.ru/browse/PSBM-55919

Signed-off-by: Maxim Patlasov <mpatla...@virtuozzo.com>
---
 fs/fuse/file.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 559dfd9..e5c4778 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -684,8 +684,8 @@ int fuse_fsync_common(struct file *file, loff_t start, 
loff_t end,
        if (err)
                goto out;
 
-       if (test_bit(FUSE_I_MTIME_UPDATED,
-                    &get_fuse_inode(inode)->state)) {
+       if (!datasync && test_bit(FUSE_I_MTIME_UPDATED,
+                                 &get_fuse_inode(inode)->state)) {
                err = fuse_flush_mtime(file, false);
                if (err)
                        goto out;

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