[PATCH] fuse: add frsize to statfs reply

Add 'frsize' member to the statfs reply.

I'm not sure if sending f_fsid will ever be needed, but just in case leave
some space at the end of the structure, so less compatibility mess would be
required.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 9 insertions, 1 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e69a546844d0..3b928a02af04 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -218,6 +218,7 @@ static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr
 {
         stbuf->f_type    = FUSE_SUPER_MAGIC;
         stbuf->f_bsize   = attr->bsize;
+        stbuf->f_frsize  = attr->frsize;
         stbuf->f_blocks  = attr->blocks;
         stbuf->f_bfree   = attr->bfree;
         stbuf->f_bavail  = attr->bavail;
@@ -238,10 +239,12 @@ static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
         if (!req)
                 return -EINTR;
 
+        memset(&outarg, 0, sizeof(outarg));
         req->in.numargs = 0;
         req->in.h.opcode = FUSE_STATFS;
         req->out.numargs = 1;
-        req->out.args[0].size = sizeof(outarg);
+        req->out.args[0].size =
+                fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
         req->out.args[0].value = &outarg;
         request_send(fc, req);
         err = req->out.h.error;
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 3c85f1a422cc..9d5177c356cc 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -53,6 +53,9 @@ struct fuse_kstatfs {
         __u64   ffree;
         __u32   bsize;
         __u32   namelen;
+        __u32   frsize;
+        __u32   padding;
+        __u32   spare[6];
 };
 
 #define FATTR_MODE      (1 << 0)
@@ -213,6 +216,8 @@ struct fuse_write_out {
         __u32   padding;
 };
 
+#define FUSE_COMPAT_STATFS_SIZE 48
+
 struct fuse_statfs_out {
         struct fuse_kstatfs st;
 };