fuse: add export operations

Implement export_operations, to allow fuse filesystems to be exported to
NFS.  This feature has been in the out-of-tree fuse module, and is widely
used and tested.

It has not been originally merged into mainline, because doing the NFS
export in userspace was thought to be a cleaner and more efficient way of
doing it, than through the kernel.

While that is true, it would also have involved a lot of duplicated effort
at reimplementing NFS exporting (all the different versions of the
protocol).  This effort was unfortunately not undertaken by anyone, so we
are left with doing it the easy but less efficient way.

If this feature goes in, the out-of-tree fuse module can go away,
which would have several advantages:

  - not having to maintain two versions
  - less confusion for users
  - no bugs due to kernel API changes

Comment from hch:
 - Use the same fh_type values as XFS, since we use the same fh encoding.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 115 insertions, 0 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 3141690558c8..71fa76a48a31 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -18,6 +18,7 @@
 #include <linux/statfs.h>
 #include <linux/random.h>
 #include <linux/sched.h>
+#include <linux/exportfs.h>
 
 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
 MODULE_DESCRIPTION("Filesystem in Userspace");
@@ -552,6 +553,119 @@ static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
         return fuse_iget(sb, 1, 0, &attr, 0, 0);
 }
 
+struct fuse_inode_handle
+{
+        u64 nodeid;
+        u32 generation;
+};
+
+static struct dentry *fuse_get_dentry(struct super_block *sb,
+                                      struct fuse_inode_handle *handle)
+{
+        struct inode *inode;
+        struct dentry *entry;
+        int err = -ESTALE;
+
+        if (handle->nodeid == 0)
+                goto out_err;
+
+        inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
+        if (!inode)
+                goto out_err;
+        err = -ESTALE;
+        if (inode->i_generation != handle->generation)
+                goto out_iput;
+
+        entry = d_alloc_anon(inode);
+        err = -ENOMEM;
+        if (!entry)
+                goto out_iput;
+
+        if (get_node_id(inode) != FUSE_ROOT_ID) {
+                entry->d_op = &fuse_dentry_operations;
+                fuse_invalidate_entry_cache(entry);
+        }
+
+        return entry;
+
+ out_iput:
+        iput(inode);
+ out_err:
+        return ERR_PTR(err);
+}
+
+static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
+                           int connectable)
+{
+        struct inode *inode = dentry->d_inode;
+        bool encode_parent = connectable && !S_ISDIR(inode->i_mode);
+        int len = encode_parent ? 6 : 3;
+        u64 nodeid;
+        u32 generation;
+
+        if (*max_len < len)
+                return  255;
+
+        nodeid = get_fuse_inode(inode)->nodeid;
+        generation = inode->i_generation;
+
+        fh[0] = (u32)(nodeid >> 32);
+        fh[1] = (u32)(nodeid & 0xffffffff);
+        fh[2] = generation;
+
+        if (encode_parent) {
+                struct inode *parent;
+
+                spin_lock(&dentry->d_lock);
+                parent = dentry->d_parent->d_inode;
+                nodeid = get_fuse_inode(parent)->nodeid;
+                generation = parent->i_generation;
+                spin_unlock(&dentry->d_lock);
+
+                fh[3] = (u32)(nodeid >> 32);
+                fh[4] = (u32)(nodeid & 0xffffffff);
+                fh[5] = generation;
+        }
+
+        *max_len = len;
+        return encode_parent ? 0x82 : 0x81;
+}
+
+static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
+                struct fid *fid, int fh_len, int fh_type)
+{
+        struct fuse_inode_handle handle;
+
+        if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
+                return NULL;
+
+        handle.nodeid = (u64) fid->raw[0] << 32;
+        handle.nodeid |= (u64) fid->raw[1];
+        handle.generation = fid->raw[2];
+        return fuse_get_dentry(sb, &handle);
+}
+
+static struct dentry *fuse_fh_to_parent(struct super_block *sb,
+                struct fid *fid, int fh_len, int fh_type)
+{
+        struct fuse_inode_handle parent;
+
+        if (fh_type != 0x82 || fh_len < 6)
+                return NULL;
+
+        parent.nodeid = (u64) fid->raw[3] << 32;
+        parent.nodeid |= (u64) fid->raw[4];
+        parent.generation = fid->raw[5];
+        return fuse_get_dentry(sb, &parent);
+}
+
+
+static const struct export_operations fuse_export_operations = {
+        .fh_to_dentry   = fuse_fh_to_dentry,
+        .fh_to_parent   = fuse_fh_to_parent,
+        .encode_fh      = fuse_encode_fh,
+};
+
 static const struct super_operations fuse_super_operations = {
         .alloc_inode    = fuse_alloc_inode,
         .destroy_inode  = fuse_destroy_inode,
@@ -652,6 +766,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
         sb->s_magic = FUSE_SUPER_MAGIC;
         sb->s_op = &fuse_super_operations;
         sb->s_maxbytes = MAX_LFS_FILESIZE;
+        sb->s_export_op = &fuse_export_operations;
 
         file = fget(d.fd);
         if (!file)