this table looks potentially very helpful - my main focus is making sure 1) that symlinks work in the "native" windows format 2) that we recognize special files created in the various forms (reparse nfs or wsl, and also sfu) 3) that the reparse=nfs case works with or without the posix extensions chosen on the mount 4) that we can create special files in reparse=nfs and wsl, and also sfu - use cases On Sun, Oct 6, 2024 at 5:01 AM Pali Rohár <pali@xxxxxxxxxx> wrote: > > This patch series improves choosing reparse format when creating new > special files. > > In following table is behavior of creating new special files before > this patch series. In columns are mount options, in rows are file types > and in each cell is reparse format which is created. > > -o reparse=default -o reparse=nfs -o reparse=wsl > symlink native native native > socket nfs nfs wsl > fifo nfs nfs wsl > block nfs nfs wsl > char nfs nfs wsl > > > After this patch series the table looks like: > > -o reparse=default -o reparse=nfs -o reparse=wsl -o reparse=native+nfs -o reparse=native+wsl -o reparse=native -o reparse=none > symlink native nfs wsl native native native -disallowed- > socket native nfs wsl native native native -disallowed- > fifo nfs nfs wsl nfs wsl -disallowed- -disallowed- > block nfs nfs wsl nfs wsl -disallowed- -disallowed- > char nfs nfs wsl nfs wsl -disallowed- -disallowed- > > > The default behavior when no option is specified (which is same as > -o reparse=default) changes only for creating new sockets which are > now created in its native NTFS form with IO_REPARSE_TAG_AF_UNIX reparse > tag. > > The nfs and wsl behavior is changed to always create new special files > in its own formats. > > There are new options native+nfs and native+wsl which creates by default > in native form (symlinks + sockets) and fallbacks to nfs/wsl for other > types (fifo, char, block). This is probably the most useful for > interoperability. Mount option -o reparse=default is now same as > -o reparse=native+nfs > > For completeness there are also new options -o reparse=native which > allows to creating only native types used by Windows applications > (symlinks and sockets) and option -o reparse=none to completely disable > creating new reparse points. > > > Pali Rohár (7): > cifs: Add mount option -o reparse=native > cifs: Add mount option -o reparse=none > cifs: Add support for creating native Windows sockets > cifs: Add support for creating NFS-style symlinks > cifs: Improve guard for excluding $LXDEV xattr > cifs: Add support for creating WSL-style symlinks > cifs: Validate content of WSL reparse point buffers > > fs/smb/client/cifsglob.h | 18 +++- > fs/smb/client/fs_context.c | 16 +++ > fs/smb/client/fs_context.h | 4 + > fs/smb/client/reparse.c | 211 +++++++++++++++++++++++++++++++------ > fs/smb/client/reparse.h | 2 + > 5 files changed, 218 insertions(+), 33 deletions(-) > > -- > 2.20.1 > > -- Thanks, Steve
