[PATCH] FUSE: add fsync operation for directories

This patch adds a new FSYNCDIR request, which is sent when fsync is called
on directories.  This operation is available in libfuse 2.3-pre1 or
greater.

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

3 files changed, 29 insertions, 4 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 9b43fd46aaad..73792d65b6cf 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -617,6 +617,12 @@ static int fuse_dir_release(struct inode *inode, struct file *file)
         return fuse_release_common(inode, file, 1);
 }
 
+static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync)
+{
+        /* nfsd can call this with no file */
+        return file ? fuse_fsync_common(file, de, datasync, 1) : 0;
+}
+
 static unsigned iattr_to_fattr(struct iattr *iattr, struct fuse_attr *fattr)
 {
         unsigned ivalid = iattr->ia_valid;
@@ -934,6 +940,7 @@ static struct file_operations fuse_dir_operations = {
         .readdir        = fuse_readdir,
         .open           = fuse_dir_open,
         .release        = fuse_dir_release,
+        .fsync          = fuse_dir_fsync,
 };
 
 static struct inode_operations fuse_common_inode_operations = {
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 6dcae74ce7fa..e225f8c0b267 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -156,7 +156,8 @@ static int fuse_flush(struct file *file)
         return err;
 }
 
-static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
+int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
+                      int isdir)
 {
         struct inode *inode = de->d_inode;
         struct fuse_conn *fc = get_fuse_conn(inode);
@@ -165,7 +166,7 @@ static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
         struct fuse_fsync_in inarg;
         int err;
 
-        if (fc->no_fsync)
+        if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
                 return 0;
 
         req = fuse_get_request(fc);
@@ -175,7 +176,7 @@ static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
         memset(&inarg, 0, sizeof(inarg));
         inarg.fh = ff->fh;
         inarg.fsync_flags = datasync ? 1 : 0;
-        req->in.h.opcode = FUSE_FSYNC;
+        req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
         req->in.h.nodeid = get_node_id(inode);
         req->inode = inode;
         req->file = file;
@@ -186,12 +187,20 @@ static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
         err = req->out.h.error;
         fuse_put_request(fc, req);
         if (err == -ENOSYS) {
-                fc->no_fsync = 1;
+                if (isdir)
+                        fc->no_fsyncdir = 1;
+                else
+                        fc->no_fsync = 1;
                 err = 0;
         }
         return err;
 }
 
+static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
+{
+        return fuse_fsync_common(file, de, datasync, 0);
+}
+
 size_t fuse_send_read_common(struct fuse_req *req, struct file *file,
                              struct inode *inode, loff_t pos, size_t count,
                              int isdir)
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 84849601363e..d7647289d8a1 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -248,6 +248,9 @@ struct fuse_conn {
         /** Is fsync not implemented by fs? */
         unsigned no_fsync : 1;
 
+        /** Is fsyncdir not implemented by fs? */
+        unsigned no_fsyncdir : 1;
+
         /** Is flush not implemented by fs? */
         unsigned no_flush : 1;
 
@@ -340,6 +343,12 @@ int fuse_open_common(struct inode *inode, struct file *file, int isdir);
 int fuse_release_common(struct inode *inode, struct file *file, int isdir);
 
 /**
+ * Send FSYNC or FSYNCDIR request
+ */
+int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
+                      int isdir);
+
+/**
  * Initialise file operations on a regular file
  */
 void fuse_init_file_inode(struct inode *inode);