On Mon, Mar 29, 2021 at 03:50:37PM +0100, Luis Henriques wrote:
> On Thu, Mar 25, 2021 at 11:18:22AM -0400, Vivek Goyal wrote:
> > Fuse client needs to send additional information to file server when
> > it calls SETXATTR(system.posix_acl_access). Right now there is no extra
> > space in fuse_setxattr_in. So introduce a v2 of the structure which has
> > more space in it and can be used to send extra flags.
> >
> > "struct fuse_setxattr_in_v2" is only used if file server opts-in for it using
> > flag FUSE_SETXATTR_V2 during feature negotiations.
> >
> > Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
> > ---
> > fs/fuse/acl.c | 2 +-
> > fs/fuse/fuse_i.h | 5 ++++-
> > fs/fuse/inode.c | 4 +++-
> > fs/fuse/xattr.c | 21 +++++++++++++++------
> > include/uapi/linux/fuse.h | 10 ++++++++++
> > 5 files changed, 33 insertions(+), 9 deletions(-)
> >
> > diff --git a/fs/fuse/acl.c b/fs/fuse/acl.c
> > index e9c0f916349d..d31260a139d4 100644
> > --- a/fs/fuse/acl.c
> > +++ b/fs/fuse/acl.c
> > @@ -94,7 +94,7 @@ int fuse_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
> > return ret;
> > }
> >
> > - ret = fuse_setxattr(inode, name, value, size, 0);
> > + ret = fuse_setxattr(inode, name, value, size, 0, 0);
> > kfree(value);
> > } else {
> > ret = fuse_removexattr(inode, name);
> > diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
> > index 63d97a15ffde..d00bf0b9a38c 100644
> > --- a/fs/fuse/fuse_i.h
> > +++ b/fs/fuse/fuse_i.h
> > @@ -668,6 +668,9 @@ struct fuse_conn {
> > /** Is setxattr not implemented by fs? */
> > unsigned no_setxattr:1;
> >
> > + /** Does file server support setxattr_v2 */
> > + unsigned setxattr_v2:1;
> > +
>
> Minor (pedantic!) comment: most of the fields here start with 'no_*', so
> maybe it's worth setting the logic to use 'no_setxattr_v2' instead?
Hi Luis,
"setxattr_v2" kind of makes more sense to me because it is disabled
by default untile and unless client opts in. If I use no_setxattr_v2,
then it means by default I will have to initialize it to 1. Right
now, following automatically takes care of it.
fc = kzalloc(sizeof(struct fuse_conn), GFP_KERNEL);
Also, there are other examples which don't use "no_" prefix.
auto_inval_data, explicit_inval_data, do_readdirplus, readdirplus_auto,
async_dio..... and list goes on.
Vivek
