Javier Martinez Canillas javierm@redhat.com writes:
The series adds support for the renameat2 system call RENAME_EXCHANGE flag (which allows to atomically replace two paths) to the vfat filesystem code.
There are many use cases for this, but we are particularly interested in making possible for vfat filesystems to be part of OSTree [0] deployments.
Currently OSTree relies on symbolic links to make the deployment updates an atomic transactional operation. But RENAME_EXCHANGE could be used [1] to achieve a similar level of robustness when using a vfat filesystem.
Patch #1 is just a preparatory patch to introduce the RENAME_EXCHANGE support, patch #2 moves some code blocks in vfat_rename() to a set of helper functions, that can be reused by tvfat_rename_exchange() that's added by patch #3 and finally patch #4 adds some kselftests to test it.
This is a v6 that addresses issues pointed out in v5:
Looks good this patchset.
Acked-by: OGAWA Hirofumi hirofumi@mail.parknet.co.jp
Thanks.