[PATCH v3 0/6] fuse: Implement FUSE_HANDLE_KILLPRIV_V2 and enable SB_NOSEC

[Vivek Goyal <vgoyal@redhat.com>]

Hi All,

Please find attached V3 of the patches to enable SB_NOSEC for fuse. I
posted V1 and V2 here.

v2:
https://lore.kernel.org/linux-fsdevel/20200916161737.38028-1-vgoyal@redhat.com/
v1:
https://lore.kernel.org/linux-fsdevel/20200724183812.19573-1-vgoyal@redhat.com/

Changes since v2:

- Based on Miklos's feedback, dropped a patch where we send ATTR_MODE as
  that's racy. To help the case of writeback_cache with killpriv_v2, I
  fallback to a synchronous WRITE if suid/sgid is set on file.

I have generated these patches on top of.

https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git/log/?h=for-nex
+t

I have taken care of feedback from last round. For the case of random
write peformance has jumped from 50MB/s to 250MB/s. So I am really
looking forward to these changes so that fuse/virtiofs performance
can be improved for direct random writes.

Thanks
Vivek


Vivek Goyal (6):
  fuse: Introduce the notion of FUSE_HANDLE_KILLPRIV_V2
  fuse: Set FUSE_WRITE_KILL_PRIV in cached write path
  fuse: setattr should set FATTR_KILL_PRIV upon size change
  fuse: Don't send ATTR_MODE to kill suid/sgid for handle_killpriv_v2
  fuse: Add a flag FUSE_OPEN_KILL_PRIV for open() request
  fuse: Support SB_NOSEC flag to improve direct write performance

 fs/fuse/dir.c             |  4 +++-
 fs/fuse/file.c            | 16 +++++++++++++++-
 fs/fuse/fuse_i.h          |  6 ++++++
 fs/fuse/inode.c           | 17 ++++++++++++++++-
 include/uapi/linux/fuse.h | 18 +++++++++++++++++-
 5 files changed, 57 insertions(+), 4 deletions(-)

-- 
2.25.4