fuse: honor AT_STATX_DONT_SYNC

The description of this flag says "Don't sync attributes with the server".
In other words: always use the attributes cached in the kernel and don't
send network or local messages to refresh the attributes.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index fa4009761a7a..ef883f0bee8f 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -924,12 +924,13 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
 }
 
 static int fuse_update_get_attr(struct inode *inode, struct file *file,
-                                struct kstat *stat)
+                                struct kstat *stat, unsigned int flags)
 {
         struct fuse_inode *fi = get_fuse_inode(inode);
         int err = 0;
 
-        if (time_before64(fi->i_time, get_jiffies_64())) {
+        if (!(flags & AT_STATX_DONT_SYNC) &&
+            time_before64(fi->i_time, get_jiffies_64())) {
                 forget_all_cached_acls(inode);
                 err = fuse_do_getattr(inode, stat, file);
         } else if (stat) {
@@ -943,7 +944,7 @@ static int fuse_update_get_attr(struct inode *inode, struct file *file,
 
 int fuse_update_attributes(struct inode *inode, struct file *file)
 {
-        return fuse_update_get_attr(inode, file, NULL);
+        return fuse_update_get_attr(inode, file, NULL, 0);
 }
 
 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
@@ -1794,7 +1795,7 @@ static int fuse_getattr(const struct path *path, struct kstat *stat,
         if (!fuse_allow_current_process(fc))
                 return -EACCES;
 
-        return fuse_update_get_attr(inode, NULL, stat);
+        return fuse_update_get_attr(inode, NULL, stat, flags);
 }
 
 static const struct inode_operations fuse_dir_inode_operations = {