FROMGIT: f2fs: introduce device aliasing file

F2FS should understand how the device aliasing file works and support
deleting the file after use. A device aliasing file can be created by
mkfs.f2fs tool and it can map the whole device with an extent, not
using node blocks. The file space should be pinned and normally used for
read-only usages.

Bug: 336319772
Change-Id: Ifbac959ef42e5c8af790bb1e0f9f4da9f5e1b592
Link: https://lore.kernel.org/lkml/20241017173153.980193-1-daeho43@gmail.com/


Signed-off-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit 495494c3037e439c5bdb7b3514924bc35a47494e
https: //git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/ dev)