tree c410d6826e9df13f7ea9e382a26589b66ec0989c
parent 334f485df85ac7736ebe14940bf0a059c5f26d7d
author Miklos Szeredi <[EMAIL PROTECTED]> Sat, 10 Sep 2005 03:10:28 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Sat, 10 Sep 2005 04:03:45 -0700

[PATCH] FUSE - read-only operations

This patch adds the read-only filesystem operations of FUSE.

This contains the following files:

 o dir.c
    - directory, symlink and file-inode operations

The following operations are added:

 o lookup
 o getattr
 o readlink
 o follow_link
 o directory open
 o readdir
 o directory release
 o permission
 o dentry revalidate
 o statfs

Signed-off-by: Miklos Szeredi <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>

 fs/fuse/Makefile     |    2 
 fs/fuse/dev.c        |    9 +
 fs/fuse/dir.c        |  413 +++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/fuse/fuse_i.h     |   51 ++++++
 fs/fuse/inode.c      |   81 ++++++++++
 include/linux/fuse.h |   60 +++++++
 6 files changed, 615 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/Makefile b/fs/fuse/Makefile
--- a/fs/fuse/Makefile
+++ b/fs/fuse/Makefile
@@ -4,4 +4,4 @@
 
 obj-$(CONFIG_FUSE_FS) += fuse.o
 
-fuse-objs := dev.o inode.o
+fuse-objs := dev.o dir.o inode.o
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -691,6 +691,13 @@ static struct fuse_req *request_find(str
        return NULL;
 }
 
+/* fget() needs to be done in this context */
+static void process_getdir(struct fuse_req *req)
+{
+       struct fuse_getdir_out_i *arg = req->out.args[0].value;
+       arg->file = fget(arg->fd);
+}
+
 static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
                         unsigned nbytes)
 {
@@ -770,6 +777,8 @@ static ssize_t fuse_dev_writev(struct fi
        if (!err) {
                if (req->interrupted)
                        err = -ENOENT;
+               else if (req->in.h.opcode == FUSE_GETDIR && !oh.error)
+                       process_getdir(req);
        } else if (!req->interrupted)
                req->out.h.error = -EIO;
        request_end(fc, req);
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
new file mode 100644
--- /dev/null
+++ b/fs/fuse/dir.c
@@ -0,0 +1,413 @@
+/*
+  FUSE: Filesystem in Userspace
+  Copyright (C) 2001-2005  Miklos Szeredi <[EMAIL PROTECTED]>
+
+  This program can be distributed under the terms of the GNU GPL.
+  See the file COPYING.
+*/
+
+#include "fuse_i.h"
+
+#include <linux/pagemap.h>
+#include <linux/file.h>
+#include <linux/gfp.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+
+static inline unsigned long time_to_jiffies(unsigned long sec,
+                                           unsigned long nsec)
+{
+       struct timespec ts = {sec, nsec};
+       return jiffies + timespec_to_jiffies(&ts);
+}
+
+static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
+                            struct dentry *entry,
+                            struct fuse_entry_out *outarg)
+{
+       req->in.h.opcode = FUSE_LOOKUP;
+       req->in.h.nodeid = get_node_id(dir);
+       req->inode = dir;
+       req->in.numargs = 1;
+       req->in.args[0].size = entry->d_name.len + 1;
+       req->in.args[0].value = entry->d_name.name;
+       req->out.numargs = 1;
+       req->out.args[0].size = sizeof(struct fuse_entry_out);
+       req->out.args[0].value = outarg;
+}
+
+static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
+{
+       if (!entry->d_inode || is_bad_inode(entry->d_inode))
+               return 0;
+       else if (time_after(jiffies, entry->d_time)) {
+               int err;
+               int version;
+               struct fuse_entry_out outarg;
+               struct inode *inode = entry->d_inode;
+               struct fuse_inode *fi = get_fuse_inode(inode);
+               struct fuse_conn *fc = get_fuse_conn(inode);
+               struct fuse_req *req = fuse_get_request_nonint(fc);
+               if (!req)
+                       return 0;
+
+               fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
+               request_send_nonint(fc, req);
+               version = req->out.h.unique;
+               err = req->out.h.error;
+               fuse_put_request(fc, req);
+               if (err || outarg.nodeid != get_node_id(inode) ||
+                   (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
+                       return 0;
+
+               fuse_change_attributes(inode, &outarg.attr);
+               inode->i_version = version;
+               entry->d_time = time_to_jiffies(outarg.entry_valid,
+                                               outarg.entry_valid_nsec);
+               fi->i_time = time_to_jiffies(outarg.attr_valid,
+                                            outarg.attr_valid_nsec);
+       }
+       return 1;
+}
+
+static struct dentry_operations fuse_dentry_operations = {
+       .d_revalidate   = fuse_dentry_revalidate,
+};
+
+static int fuse_lookup_iget(struct inode *dir, struct dentry *entry,
+                           struct inode **inodep)
+{
+       int err;
+       int version;
+       struct fuse_entry_out outarg;
+       struct inode *inode = NULL;
+       struct fuse_conn *fc = get_fuse_conn(dir);
+       struct fuse_req *req;
+
+       if (entry->d_name.len > FUSE_NAME_MAX)
+               return -ENAMETOOLONG;
+
+       req = fuse_get_request(fc);
+       if (!req)
+               return -ERESTARTNOINTR;
+
+       fuse_lookup_init(req, dir, entry, &outarg);
+       request_send(fc, req);
+       version = req->out.h.unique;
+       err = req->out.h.error;
+       if (!err) {
+               inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
+                                 &outarg.attr, version);
+               if (!inode) {
+                       fuse_send_forget(fc, req, outarg.nodeid, version);
+                       return -ENOMEM;
+               }
+       }
+       fuse_put_request(fc, req);
+       if (err && err != -ENOENT)
+               return err;
+
+       if (inode) {
+               struct fuse_inode *fi = get_fuse_inode(inode);
+               entry->d_time = time_to_jiffies(outarg.entry_valid,
+                                               outarg.entry_valid_nsec);
+               fi->i_time = time_to_jiffies(outarg.attr_valid,
+                                            outarg.attr_valid_nsec);
+       }
+
+       entry->d_op = &fuse_dentry_operations;
+       *inodep = inode;
+       return 0;
+}
+
+int fuse_do_getattr(struct inode *inode)
+{
+       int err;
+       struct fuse_attr_out arg;
+       struct fuse_conn *fc = get_fuse_conn(inode);
+       struct fuse_req *req = fuse_get_request(fc);
+       if (!req)
+               return -ERESTARTNOINTR;
+
+       req->in.h.opcode = FUSE_GETATTR;
+       req->in.h.nodeid = get_node_id(inode);
+       req->inode = inode;
+       req->out.numargs = 1;
+       req->out.args[0].size = sizeof(arg);
+       req->out.args[0].value = &arg;
+       request_send(fc, req);
+       err = req->out.h.error;
+       fuse_put_request(fc, req);
+       if (!err) {
+               if ((inode->i_mode ^ arg.attr.mode) & S_IFMT) {
+                       make_bad_inode(inode);
+                       err = -EIO;
+               } else {
+                       struct fuse_inode *fi = get_fuse_inode(inode);
+                       fuse_change_attributes(inode, &arg.attr);
+                       fi->i_time = time_to_jiffies(arg.attr_valid,
+                                                    arg.attr_valid_nsec);
+               }
+       }
+       return err;
+}
+
+static int fuse_revalidate(struct dentry *entry)
+{
+       struct inode *inode = entry->d_inode;
+       struct fuse_inode *fi = get_fuse_inode(inode);
+       struct fuse_conn *fc = get_fuse_conn(inode);
+
+       if (get_node_id(inode) == FUSE_ROOT_ID) {
+               if (current->fsuid != fc->user_id)
+                       return -EACCES;
+       } else if (time_before_eq(jiffies, fi->i_time))
+               return 0;
+
+       return fuse_do_getattr(inode);
+}
+
+static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+       struct fuse_conn *fc = get_fuse_conn(inode);
+
+       if (current->fsuid != fc->user_id)
+               return -EACCES;
+       else {
+               int mode = inode->i_mode;
+               if ((mask & MAY_WRITE) && IS_RDONLY(inode) &&
+                    (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
+                        return -EROFS;
+               if ((mask & MAY_EXEC) && !S_ISDIR(mode) && !(mode & S_IXUGO))
+                       return -EACCES;
+               return 0;
+       }
+}
+
+static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
+                        void *dstbuf, filldir_t filldir)
+{
+       while (nbytes >= FUSE_NAME_OFFSET) {
+               struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
+               size_t reclen = FUSE_DIRENT_SIZE(dirent);
+               int over;
+               if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
+                       return -EIO;
+               if (reclen > nbytes)
+                       break;
+
+               over = filldir(dstbuf, dirent->name, dirent->namelen,
+                              file->f_pos, dirent->ino, dirent->type);
+               if (over)
+                       break;
+
+               buf += reclen;
+               nbytes -= reclen;
+               file->f_pos = dirent->off;
+       }
+
+       return 0;
+}
+
+static int fuse_checkdir(struct file *cfile, struct file *file)
+{
+       struct inode *inode;
+       if (!cfile)
+               return -EIO;
+       inode = cfile->f_dentry->d_inode;
+       if (!S_ISREG(inode->i_mode)) {
+               fput(cfile);
+               return -EIO;
+       }
+
+       file->private_data = cfile;
+       return 0;
+}
+
+static int fuse_getdir(struct file *file)
+{
+       struct inode *inode = file->f_dentry->d_inode;
+       struct fuse_conn *fc = get_fuse_conn(inode);
+       struct fuse_req *req = fuse_get_request(fc);
+       struct fuse_getdir_out_i outarg;
+       int err;
+
+       if (!req)
+               return -ERESTARTNOINTR;
+
+       req->in.h.opcode = FUSE_GETDIR;
+       req->in.h.nodeid = get_node_id(inode);
+       req->inode = inode;
+       req->out.numargs = 1;
+       req->out.args[0].size = sizeof(struct fuse_getdir_out);
+       req->out.args[0].value = &outarg;
+       request_send(fc, req);
+       err = req->out.h.error;
+       fuse_put_request(fc, req);
+       if (!err)
+               err = fuse_checkdir(outarg.file, file);
+       return err;
+}
+
+static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
+{
+       struct file *cfile = file->private_data;
+       char *buf;
+       int ret;
+
+       if (!cfile) {
+               ret = fuse_getdir(file);
+               if (ret)
+                       return ret;
+
+               cfile = file->private_data;
+       }
+
+       buf = (char *) __get_free_page(GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       ret = kernel_read(cfile, file->f_pos, buf, PAGE_SIZE);
+       if (ret > 0)
+               ret = parse_dirfile(buf, ret, file, dstbuf, filldir);
+
+       free_page((unsigned long) buf);
+       return ret;
+}
+
+static char *read_link(struct dentry *dentry)
+{
+       struct inode *inode = dentry->d_inode;
+       struct fuse_conn *fc = get_fuse_conn(inode);
+       struct fuse_req *req = fuse_get_request(fc);
+       char *link;
+
+       if (!req)
+               return ERR_PTR(-ERESTARTNOINTR);
+
+       link = (char *) __get_free_page(GFP_KERNEL);
+       if (!link) {
+               link = ERR_PTR(-ENOMEM);
+               goto out;
+       }
+       req->in.h.opcode = FUSE_READLINK;
+       req->in.h.nodeid = get_node_id(inode);
+       req->inode = inode;
+       req->out.argvar = 1;
+       req->out.numargs = 1;
+       req->out.args[0].size = PAGE_SIZE - 1;
+       req->out.args[0].value = link;
+       request_send(fc, req);
+       if (req->out.h.error) {
+               free_page((unsigned long) link);
+               link = ERR_PTR(req->out.h.error);
+       } else
+               link[req->out.args[0].size] = '\0';
+ out:
+       fuse_put_request(fc, req);
+       return link;
+}
+
+static void free_link(char *link)
+{
+       if (!IS_ERR(link))
+               free_page((unsigned long) link);
+}
+
+static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+       nd_set_link(nd, read_link(dentry));
+       return NULL;
+}
+
+static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
+{
+       free_link(nd_get_link(nd));
+}
+
+static int fuse_dir_open(struct inode *inode, struct file *file)
+{
+       file->private_data = NULL;
+       return 0;
+}
+
+static int fuse_dir_release(struct inode *inode, struct file *file)
+{
+       struct file *cfile = file->private_data;
+
+       if (cfile)
+               fput(cfile);
+
+       return 0;
+}
+
+static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
+                       struct kstat *stat)
+{
+       struct inode *inode = entry->d_inode;
+       int err = fuse_revalidate(entry);
+       if (!err)
+               generic_fillattr(inode, stat);
+
+       return err;
+}
+
+static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
+                                 struct nameidata *nd)
+{
+       struct inode *inode;
+       int err = fuse_lookup_iget(dir, entry, &inode);
+       if (err)
+               return ERR_PTR(err);
+       if (inode && S_ISDIR(inode->i_mode)) {
+               /* Don't allow creating an alias to a directory  */
+               struct dentry *alias = d_find_alias(inode);
+               if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
+                       dput(alias);
+                       iput(inode);
+                       return ERR_PTR(-EIO);
+               }
+       }
+       return d_splice_alias(inode, entry);
+}
+
+static struct inode_operations fuse_dir_inode_operations = {
+       .lookup         = fuse_lookup,
+       .permission     = fuse_permission,
+       .getattr        = fuse_getattr,
+};
+
+static struct file_operations fuse_dir_operations = {
+       .read           = generic_read_dir,
+       .readdir        = fuse_readdir,
+       .open           = fuse_dir_open,
+       .release        = fuse_dir_release,
+};
+
+static struct inode_operations fuse_common_inode_operations = {
+       .permission     = fuse_permission,
+       .getattr        = fuse_getattr,
+};
+
+static struct inode_operations fuse_symlink_inode_operations = {
+       .follow_link    = fuse_follow_link,
+       .put_link       = fuse_put_link,
+       .readlink       = generic_readlink,
+       .getattr        = fuse_getattr,
+};
+
+void fuse_init_common(struct inode *inode)
+{
+       inode->i_op = &fuse_common_inode_operations;
+}
+
+void fuse_init_dir(struct inode *inode)
+{
+       inode->i_op = &fuse_dir_inode_operations;
+       inode->i_fop = &fuse_dir_operations;
+}
+
+void fuse_init_symlink(struct inode *inode)
+{
+       inode->i_op = &fuse_symlink_inode_operations;
+}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -30,6 +30,9 @@ struct fuse_inode {
         * and kernel */
        u64 nodeid;
 
+       /** The request used for sending the FORGET message */
+       struct fuse_req *forget_req;
+
        /** Time in jiffies until the file attributes are valid */
        unsigned long i_time;
 };
@@ -129,6 +132,7 @@ struct fuse_req {
 
        /** Data for asynchronous requests */
        union {
+               struct fuse_forget_in forget_in;
                struct fuse_init_in_out init_in_out;
        } misc;
 
@@ -197,6 +201,11 @@ struct fuse_conn {
        struct backing_dev_info bdi;
 };
 
+struct fuse_getdir_out_i {
+       int fd;
+       void *file; /* Used by kernel only */
+};
+
 static inline struct fuse_conn **get_fuse_conn_super_p(struct super_block *sb)
 {
        return (struct fuse_conn **) &sb->s_fs_info;
@@ -240,6 +249,38 @@ extern struct file_operations fuse_dev_o
 extern spinlock_t fuse_lock;
 
 /**
+ * Get a filled in inode
+ */
+struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
+                       int generation, struct fuse_attr *attr, int version);
+
+/**
+ * Send FORGET command
+ */
+void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
+                     unsigned long nodeid, int version);
+
+/**
+ * Initialise inode operations on regular files and special files
+ */
+void fuse_init_common(struct inode *inode);
+
+/**
+ * Initialise inode and file operations on a directory
+ */
+void fuse_init_dir(struct inode *inode);
+
+/**
+ * Initialise inode operations on a symlink
+ */
+void fuse_init_symlink(struct inode *inode);
+
+/**
+ * Change attributes of an inode
+ */
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr);
+
+/**
  * Check if the connection can be released, and if yes, then free the
  * connection structure
  */
@@ -307,6 +348,16 @@ void request_send_noreply(struct fuse_co
 void request_send_background(struct fuse_conn *fc, struct fuse_req *req);
 
 /**
+ * Get the attributes of a file
+ */
+int fuse_do_getattr(struct inode *inode);
+
+/**
+ * Invalidate inode attributes
+ */
+void fuse_invalidate_attr(struct inode *inode);
+
+/**
  * Send the INIT message
  */
 void fuse_send_init(struct fuse_conn *fc);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -51,12 +51,20 @@ static struct inode *fuse_alloc_inode(st
        fi = get_fuse_inode(inode);
        fi->i_time = jiffies - 1;
        fi->nodeid = 0;
+       fi->forget_req = fuse_request_alloc();
+       if (!fi->forget_req) {
+               kmem_cache_free(fuse_inode_cachep, inode);
+               return NULL;
+       }
 
        return inode;
 }
 
 static void fuse_destroy_inode(struct inode *inode)
 {
+       struct fuse_inode *fi = get_fuse_inode(inode);
+       if (fi->forget_req)
+               fuse_request_free(fi->forget_req);
        kmem_cache_free(fuse_inode_cachep, inode);
 }
 
@@ -65,8 +73,27 @@ static void fuse_read_inode(struct inode
        /* No op */
 }
 
+void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
+                     unsigned long nodeid, int version)
+{
+       struct fuse_forget_in *inarg = &req->misc.forget_in;
+       inarg->version = version;
+       req->in.h.opcode = FUSE_FORGET;
+       req->in.h.nodeid = nodeid;
+       req->in.numargs = 1;
+       req->in.args[0].size = sizeof(struct fuse_forget_in);
+       req->in.args[0].value = inarg;
+       request_send_noreply(fc, req);
+}
+
 static void fuse_clear_inode(struct inode *inode)
 {
+       struct fuse_conn *fc = get_fuse_conn(inode);
+       if (fc) {
+               struct fuse_inode *fi = get_fuse_inode(inode);
+               fuse_send_forget(fc, fi->forget_req, fi->nodeid, 
inode->i_version);
+               fi->forget_req = NULL;
+       }
 }
 
 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
@@ -94,6 +121,22 @@ static void fuse_init_inode(struct inode
 {
        inode->i_mode = attr->mode & S_IFMT;
        i_size_write(inode, attr->size);
+       if (S_ISREG(inode->i_mode)) {
+               fuse_init_common(inode);
+       } else if (S_ISDIR(inode->i_mode))
+               fuse_init_dir(inode);
+       else if (S_ISLNK(inode->i_mode))
+               fuse_init_symlink(inode);
+       else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
+                S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
+               fuse_init_common(inode);
+               init_special_inode(inode, inode->i_mode,
+                                  new_decode_dev(attr->rdev));
+       } else {
+               /* Don't let user create weird files */
+               inode->i_mode = S_IFREG;
+               fuse_init_common(inode);
+       }
 }
 
 static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
@@ -158,6 +201,43 @@ static void fuse_put_super(struct super_
        spin_unlock(&fuse_lock);
 }
 
+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_blocks  = attr->blocks;
+       stbuf->f_bfree   = attr->bfree;
+       stbuf->f_bavail  = attr->bavail;
+       stbuf->f_files   = attr->files;
+       stbuf->f_ffree   = attr->ffree;
+       stbuf->f_namelen = attr->namelen;
+       /* fsid is left zero */
+}
+
+static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+       struct fuse_conn *fc = get_fuse_conn_super(sb);
+       struct fuse_req *req;
+       struct fuse_statfs_out outarg;
+       int err;
+
+        req = fuse_get_request(fc);
+       if (!req)
+               return -ERESTARTSYS;
+
+       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].value = &outarg;
+       request_send(fc, req);
+       err = req->out.h.error;
+       if (!err)
+               convert_fuse_statfs(buf, &outarg.st);
+       fuse_put_request(fc, req);
+       return err;
+}
+
 enum {
        OPT_FD,
        OPT_ROOTMODE,
@@ -318,6 +398,7 @@ static struct super_operations fuse_supe
        .read_inode     = fuse_read_inode,
        .clear_inode    = fuse_clear_inode,
        .put_super      = fuse_put_super,
+       .statfs         = fuse_statfs,
        .show_options   = fuse_show_options,
 };
 
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -42,13 +42,61 @@ struct fuse_attr {
        __u32   rdev;
 };
 
+struct fuse_kstatfs {
+       __u64   blocks;
+       __u64   bfree;
+       __u64   bavail;
+       __u64   files;
+       __u64   ffree;
+       __u32   bsize;
+       __u32   namelen;
+};
+
 enum fuse_opcode {
+       FUSE_LOOKUP        = 1,
+       FUSE_FORGET        = 2,  /* no reply */
+       FUSE_GETATTR       = 3,
+       FUSE_READLINK      = 5,
+       FUSE_GETDIR        = 7,
+       FUSE_STATFS        = 17,
        FUSE_INIT          = 26
 };
 
 /* Conservative buffer size for the client */
 #define FUSE_MAX_IN 8192
 
+#define FUSE_NAME_MAX 1024
+
+struct fuse_entry_out {
+       __u64   nodeid;         /* Inode ID */
+       __u64   generation;     /* Inode generation: nodeid:gen must
+                                  be unique for the fs's lifetime */
+       __u64   entry_valid;    /* Cache timeout for the name */
+       __u64   attr_valid;     /* Cache timeout for the attributes */
+       __u32   entry_valid_nsec;
+       __u32   attr_valid_nsec;
+       struct fuse_attr attr;
+};
+
+struct fuse_forget_in {
+       __u64   version;
+};
+
+struct fuse_attr_out {
+       __u64   attr_valid;     /* Cache timeout for the attributes */
+       __u32   attr_valid_nsec;
+       __u32   dummy;
+       struct fuse_attr attr;
+};
+
+struct fuse_getdir_out {
+       __u32   fd;
+};
+
+struct fuse_statfs_out {
+       struct fuse_kstatfs st;
+};
+
 struct fuse_init_in_out {
        __u32   major;
        __u32   minor;
@@ -70,3 +118,15 @@ struct fuse_out_header {
        __u64   unique;
 };
 
+struct fuse_dirent {
+       __u64   ino;
+       __u64   off;
+       __u32   namelen;
+       __u32   type;
+       char name[0];
+};
+
+#define FUSE_NAME_OFFSET ((unsigned) ((struct fuse_dirent *) 0)->name)
+#define FUSE_DIRENT_ALIGN(x) (((x) + sizeof(__u64) - 1) & ~(sizeof(__u64) - 1))
+#define FUSE_DIRENT_SIZE(d) \
+       FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
-
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