[Devel] [PATCH vz7] fuse: no mtime flush on fdatasync

[Maxim Patlasov]

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 <mpatlasov at 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;