From: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> --- Documentation/filesystems/porting | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index c68ea9294b5f..77e2d623e115 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -610,3 +610,15 @@ in your dentry operations instead. value for 'called finish_no_open(), open it yourself' case has become 0, not 1. Since finish_no_open() itself is returning 0 now, that part does not need any changes in ->atomic_open() instances. +-- +[mandatory] + alloc_file() has become static now; two wrappers are to be used instead. + alloc_file_pseudo(inode, vfsmount, name, mode, ops) is for the cases + when dentry needs to be created; that's the majority of old alloc_file() + users. Calling conventions: on success a reference to new struct file + is returned and callers reference to inode is subsumed by that. On + failure, ERR_PTR() is returned and no caller's references are affected, + so the caller needs to drop the inode reference it held. + alloc_file_clone(file, mode, ops) does not affect any caller's references. + On success you get a new struct file sharing the mount/dentry with the + original, on failure - ERR_PTR(). -- 2.11.0
