1 files changed, 17 insertions, 5 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 00bb5a255ded..2167fc4fcab8 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -117,12 +117,22 @@ static void fuse_truncate(struct address_space *mapping, loff_t offset)
         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
 }
 
-void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
+
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
+                            u64 attr_valid, u64 attr_version)
 {
         struct fuse_conn *fc = get_fuse_conn(inode);
         struct fuse_inode *fi = get_fuse_inode(inode);
         loff_t oldsize;
 
+        spin_lock(&fc->lock);
+        if (attr_version != 0 && fi->attr_version > attr_version) {
+                spin_unlock(&fc->lock);
+                return;
+        }
+        fi->attr_version = ++fc->attr_version;
+        fi->i_time = attr_valid;
+
         inode->i_ino     = attr->ino;
         inode->i_mode    = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
         inode->i_nlink   = attr->nlink;
@@ -145,7 +155,6 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
         if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
                 inode->i_mode &= ~S_ISVTX;
 
-        spin_lock(&fc->lock);
         oldsize = inode->i_size;
         i_size_write(inode, attr->size);
         spin_unlock(&fc->lock);
@@ -194,7 +203,8 @@ static int fuse_inode_set(struct inode *inode, void *_nodeidp)
 }
 
 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
-                        int generation, struct fuse_attr *attr)
+                        int generation, struct fuse_attr *attr,
+                        u64 attr_valid, u64 attr_version)
 {
         struct inode *inode;
         struct fuse_inode *fi;
@@ -222,7 +232,8 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
         spin_lock(&fc->lock);
         fi->nlookup ++;
         spin_unlock(&fc->lock);
-        fuse_change_attributes(inode, attr);
+        fuse_change_attributes(inode, attr, attr_valid, attr_version);
+
         return inode;
 }
 
@@ -457,6 +468,7 @@ static struct fuse_conn *new_conn(void)
                 }
                 fc->reqctr = 0;
                 fc->blocked = 1;
+                fc->attr_version = 1;
                 get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
         }
 out:
@@ -488,7 +500,7 @@ static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
         attr.mode = mode;
         attr.ino = FUSE_ROOT_ID;
         attr.nlink = 1;
-        return fuse_iget(sb, 1, 0, &attr);
+        return fuse_iget(sb, 1, 0, &attr, 0, 0);
 }
 
 static const struct super_operations fuse_super_operations = {