[PATCH] FUSE - read-write operations

This patch adds the write filesystem operations of FUSE.

The following operations are added:

 o setattr
 o symlink
 o mknod
 o mkdir
 o create
 o unlink
 o rmdir
 o rename
 o link
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/fuse/fuse_i.h

@@ -30,6 +30,9 @@ struct fuse_inode {
 	 * and kernel */
 	u64 nodeid;
 
+	/** Number of lookups on this inode */
+	u64 nlookup;
+
 	/** The request used for sending the FORGET message */
 	struct fuse_req *forget_req;
 
@@ -252,13 +255,13 @@ 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);
+			int generation, struct fuse_attr *attr);
 
 /**
  * Send FORGET command
  */
 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
-		      unsigned long nodeid, int version);
+		      unsigned long nodeid, u64 nlookup);
 
 /**
  * Initialise inode operations on regular files and special files

fs/fuse/inode.c

@@ -51,6 +51,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
 	fi = get_fuse_inode(inode);
 	fi->i_time = jiffies - 1;
 	fi->nodeid = 0;
+	fi->nlookup = 0;
 	fi->forget_req = fuse_request_alloc();
 	if (!fi->forget_req) {
 		kmem_cache_free(fuse_inode_cachep, inode);
@@ -74,10 +75,10 @@ static void fuse_read_inode(struct inode *inode)
 }
 
 void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
-		      unsigned long nodeid, int version)
+		      unsigned long nodeid, u64 nlookup)
 {
 	struct fuse_forget_in *inarg = &req->misc.forget_in;
-	inarg->version = version;
+	inarg->nlookup = nlookup;
 	req->in.h.opcode = FUSE_FORGET;
 	req->in.h.nodeid = nodeid;
 	req->in.numargs = 1;
@@ -91,7 +92,7 @@ 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);
+		fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
 		fi->forget_req = NULL;
 	}
 }
@@ -156,9 +157,10 @@ static int fuse_inode_set(struct inode *inode, void *_nodeidp)
 }
 
 struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
-			int generation, struct fuse_attr *attr, int version)
+			int generation, struct fuse_attr *attr)
 {
 	struct inode *inode;
+	struct fuse_inode *fi;
 	struct fuse_conn *fc = get_fuse_conn_super(sb);
 	int retried = 0;
 
@@ -181,8 +183,9 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
 		goto retry;
 	}
 
+	fi = get_fuse_inode(inode);
+	fi->nlookup ++;
 	fuse_change_attributes(inode, attr);
-	inode->i_version = version;
 	return inode;
 }
 
@@ -389,7 +392,7 @@ static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
 
 	attr.mode = mode;
 	attr.ino = FUSE_ROOT_ID;
-	return fuse_iget(sb, 1, 0, &attr, 0);
+	return fuse_iget(sb, 1, 0, &attr);
 }
 
 static struct super_operations fuse_super_operations = {

include/linux/fuse.h

@@ -11,7 +11,7 @@
 #include <asm/types.h>
 
 /** Version number of this interface */
-#define FUSE_KERNEL_VERSION 6
+#define FUSE_KERNEL_VERSION 7
 
 /** Minor version number of this interface */
 #define FUSE_KERNEL_MINOR_VERSION 1
@@ -52,12 +52,28 @@ struct fuse_kstatfs {
 	__u32	namelen;
 };
 
+#define FATTR_MODE	(1 << 0)
+#define FATTR_UID	(1 << 1)
+#define FATTR_GID	(1 << 2)
+#define FATTR_SIZE	(1 << 3)
+#define FATTR_ATIME	(1 << 4)
+#define FATTR_MTIME	(1 << 5)
+#define FATTR_CTIME	(1 << 6)
+
 enum fuse_opcode {
 	FUSE_LOOKUP	   = 1,
 	FUSE_FORGET	   = 2,  /* no reply */
 	FUSE_GETATTR	   = 3,
+	FUSE_SETATTR	   = 4,
 	FUSE_READLINK	   = 5,
+	FUSE_SYMLINK	   = 6,
 	FUSE_GETDIR	   = 7,
+	FUSE_MKNOD	   = 8,
+	FUSE_MKDIR	   = 9,
+	FUSE_UNLINK	   = 10,
+	FUSE_RMDIR	   = 11,
+	FUSE_RENAME	   = 12,
+	FUSE_LINK	   = 13,
 	FUSE_STATFS	   = 17,
 	FUSE_INIT          = 26
 };
@@ -66,6 +82,7 @@ enum fuse_opcode {
 #define FUSE_MAX_IN 8192
 
 #define FUSE_NAME_MAX 1024
+#define FUSE_SYMLINK_MAX 4096
 
 struct fuse_entry_out {
 	__u64	nodeid;		/* Inode ID */
@@ -79,7 +96,7 @@ struct fuse_entry_out {
 };
 
 struct fuse_forget_in {
-	__u64	version;
+	__u64	nlookup;
 };
 
 struct fuse_attr_out {
@@ -93,6 +110,28 @@ struct fuse_getdir_out {
 	__u32	fd;
 };
 
+struct fuse_mknod_in {
+	__u32	mode;
+	__u32	rdev;
+};
+
+struct fuse_mkdir_in {
+	__u32	mode;
+};
+
+struct fuse_rename_in {
+	__u64	newdir;
+};
+
+struct fuse_link_in {
+	__u64	oldnodeid;
+};
+
+struct fuse_setattr_in {
+	__u32	valid;
+	struct fuse_attr attr;
+};
+
 struct fuse_statfs_out {
 	struct fuse_kstatfs st;
 };