[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>
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index ea6339c..33fad33 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -151,6 +151,8 @@
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);
@@ -229,9 +231,22 @@
return 0;
}
+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)
{
- kfree(fc);
+ if (!fc->sb && !fc->file)
+ free_conn(fc);
}
static struct fuse_conn *new_conn(void)
@@ -240,11 +255,27 @@
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 @@
{
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 @@
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 @@
iput(root);
goto err;
}
+ fuse_send_init(fc);
return 0;
err:
@@ -411,8 +452,14 @@
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 @@
printk(KERN_DEBUG "fuse exit\n");
fuse_fs_cleanup();
+ fuse_dev_cleanup();
}
module_init(fuse_init);