fuse: update mtime on truncate(2)

Handling truncate(2), VFS doesn't set ATTR_MTIME bit in iattr structure;
only ATTR_SIZE bit is set. In-kernel fuse must handle the case by setting
mtime fields of struct fuse_setattr_in to "now" and set FATTR_MTIME bit
even though ATTR_MTIME was not set.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 5b4e035b364c..5e361b122526 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1678,6 +1678,8 @@ int fuse_do_setattr(struct inode *inode, struct iattr *attr,
         if (is_truncate) {
                 fuse_set_nowrite(inode);
                 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
+                if (trust_local_mtime && attr->ia_size != inode->i_size)
+                        attr->ia_valid |= ATTR_MTIME;
         }
 
         memset(&inarg, 0, sizeof(inarg));