[PATCH] FUSE - device functions

This adds the FUSE device handling functions.

This contains the following files:

 o dev.c
    - fuse device operations (read, write, release, poll)
    - registers misc device
    - support for sending requests to userspace

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

1 files changed, 53 insertions, 5 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index ea6339c2b6a..33fad334ba7 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -151,6 +151,8 @@ static void fuse_put_super(struct super_block *sb)
         mount_count --;
         fc->sb = NULL;
         fc->user_id = 0;
+        /* Flush all readers on this fs */
+        wake_up_all(&fc->waitq);
         fuse_release_conn(fc);
         *get_fuse_conn_super_p(sb) = NULL;
         spin_unlock(&fuse_lock);
@@ -229,22 +231,51 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
         return 0;
 }
 
-void fuse_release_conn(struct fuse_conn *fc)
+static void free_conn(struct fuse_conn *fc)
 {
+        while (!list_empty(&fc->unused_list)) {
+                struct fuse_req *req;
+                req = list_entry(fc->unused_list.next, struct fuse_req, list);
+                list_del(&req->list);
+                fuse_request_free(req);
+        }
         kfree(fc);
 }
 
+/* Must be called with the fuse lock held */
+void fuse_release_conn(struct fuse_conn *fc)
+{
+        if (!fc->sb && !fc->file)
+                free_conn(fc);
+}
+
 static struct fuse_conn *new_conn(void)
 {
         struct fuse_conn *fc;
 
         fc = kmalloc(sizeof(*fc), GFP_KERNEL);
         if (fc != NULL) {
+                int i;
                 memset(fc, 0, sizeof(*fc));
                 fc->sb = NULL;
+                fc->file = NULL;
                 fc->user_id = 0;
+                init_waitqueue_head(&fc->waitq);
+                INIT_LIST_HEAD(&fc->pending);
+                INIT_LIST_HEAD(&fc->processing);
+                INIT_LIST_HEAD(&fc->unused_list);
+                sema_init(&fc->outstanding_sem, 0);
+                for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
+                        struct fuse_req *req = fuse_request_alloc();
+                        if (!req) {
+                                free_conn(fc);
+                                return NULL;
+                        }
+                        list_add(&req->list, &fc->unused_list);
+                }
                 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
                 fc->bdi.unplug_io_fn = default_unplug_io_fn;
+                fc->reqctr = 0;
         }
         return fc;
 }
@@ -253,11 +284,20 @@ static struct fuse_conn *get_conn(struct file *file, struct super_block *sb)
 {
         struct fuse_conn *fc;
 
+        if (file->f_op != &fuse_dev_operations)
+                return ERR_PTR(-EINVAL);
         fc = new_conn();
         if (fc == NULL)
-                return NULL;
+                return ERR_PTR(-ENOMEM);
         spin_lock(&fuse_lock);
-        fc->sb = sb;
+        if (file->private_data) {
+                free_conn(fc);
+                fc = ERR_PTR(-EINVAL);
+        } else {
+                file->private_data = fc;
+                fc->sb = sb;
+                fc->file = file;
+        }
         spin_unlock(&fuse_lock);
         return fc;
 }
@@ -315,8 +355,8 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 
         fc = get_conn(file, sb);
         fput(file);
-        if (fc == NULL)
-                return -EINVAL;
+        if (IS_ERR(fc))
+                return PTR_ERR(fc);
 
         fc->user_id = d.user_id;
 
@@ -336,6 +376,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
                 iput(root);
                 goto err;
         }
+        fuse_send_init(fc);
         return 0;
 
  err:
@@ -411,8 +452,14 @@ static int __init fuse_init(void)
         if (res)
                 goto err;
 
+        res = fuse_dev_init();
+        if (res)
+                goto err_fs_cleanup;
+
         return 0;
 
+ err_fs_cleanup:
+        fuse_fs_cleanup();
  err:
         return res;
 }
@@ -422,6 +469,7 @@ static void __exit fuse_exit(void)
         printk(KERN_DEBUG "fuse exit\n");
 
         fuse_fs_cleanup();
+        fuse_dev_cleanup();
 }
 
 module_init(fuse_init);