From: Jeff Layton This converts pipefs to use the new scheme. Here we're calling iunique to get a unique i_ino value for the new inode, and then hashing it afterward. We call iunique with a max_reserved value of 1 to avoid collision with the root inode. Since the inode is now hashed, we need to take care that we end up in generic_delete_inode rather than generic_forget_inode or we'll create a nasty leak, so we clear_nlink when we destroy the pipe info. Signed-off-by: Jeff Layton Cc: Christoph Hellwig Cc: Al Viro Signed-off-by: Andrew Morton --- fs/pipe.c | 3 +++ 1 file changed, 3 insertions(+) diff -puN fs/pipe.c~have-pipefs-ensure-i_ino-uniqueness-by-calling-iunique-and-hashing-the-inode fs/pipe.c --- a/fs/pipe.c~have-pipefs-ensure-i_ino-uniqueness-by-calling-iunique-and-hashing-the-inode +++ a/fs/pipe.c @@ -825,6 +825,7 @@ void free_pipe_info(struct inode *inode) { __free_pipe_info(inode->i_pipe); inode->i_pipe = NULL; + clear_nlink(inode); } static struct vfsmount *pipe_mnt __read_mostly; @@ -871,6 +872,8 @@ static struct inode * get_pipe_inode(voi inode->i_uid = current->fsuid; inode->i_gid = current->fsgid; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_ino = iunique(pipe_mnt->mnt_sb, 1); + insert_inode_hash(inode); return inode; _