fuse_attr needs blksize

[akiradeveloper]

Current rust-fuse doesn't have blksize field in fuse_attr struct.

Is this a bug?

struct fuse_attr {
        __u64   ino;
        __u64   size;
        __u64   blocks;
        __u64   atime;
        __u64   mtime;
        __u64   ctime;
        __u32   atimensec;
        __u32   mtimensec;
        __u32   ctimensec;
        __u32   mode;
        __u32   nlink;
        __u32   uid;
        __u32   gid;
        __u32   rdev;
        __u32   blksize;
        __u32   padding;
};

[cuviper]

Well, rust-fuse declares itself using protocol 7.8 (FUSE_KERNEL_VERSION and FUSE_KERNEL_MINOR_VERSION), but Linux only added blksize starting in protocol 7.9 with commit 0e9663ee452ff, released in Linux 2.6.24. I'm not sure what OSX has.

[akiradeveloper]

I see. So that's not a bug. But, being adherent to that old version sounds no good to users.

[akiradeveloper]

But supporting 7.8 protocol sounds reasonable if you construct a simple fuse binding.
Yeah, my nim-fuse will follow you.

[zargony]

Release 2.7.4 of OSXFUSE seems to be at protocol version 7.8: [header]
The master branch however seems to have unreleased stuff for protocol version up to 7.19: [header]

[kahing]

I wonder if it's because of protocol versions that -o atomic_o_trunc also doesn't work?

[zargony]

fuse_attr.blksize and FUSE_ATOMIC_O_TRUNC were both introduced in 7.9, we're still using 7.8 unfortunately.
I started to work on supporting a newer protocol in PR #97. It's targeting protocol 7.19 which seems to be well supported by Linux and macOS.