[PATCH] fuse: fix spurious BUG

Fix a spurious BUG in an unlikely race, where at least three parallel lookups
return the same inode, but with different file type.  This has not yet been
observed in real life.

Allowing unlimited retries could delay fuse_iget() indefinitely, but this is
really for the broken userspace filesystem to worry about.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e9114237f31f28b10b45ef9bf189b2c39f044381..4ee8f72e63805cf39b1f2ba900c6031740e5e3aa 100644 (file)
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -172,7 +172,6 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
        struct inode *inode;
        struct fuse_inode *fi;
        struct fuse_conn *fc = get_fuse_conn_super(sb);
-       int retried = 0;
 
  retry:
        inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
@@ -186,11 +185,9 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
                fuse_init_inode(inode, attr);
                unlock_new_inode(inode);
        } else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
-               BUG_ON(retried);
                /* Inode has changed type, any I/O on the old should fail */
                make_bad_inode(inode);
                iput(inode);
-               retried = 1;
                goto retry;
        }