[PATCH] fuse: clean up request accounting

[deliverable/linux.git] / fs / fuse / fuse_i.h

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 4a83adfec968ebae108b9ae71802e14db6ef6dbb..242e69cb12517c017975fea7489b9736277172b4 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -1,6 +1,6 @@
 /*
   FUSE: Filesystem in Userspace
-  Copyright (C) 2001-2005  Miklos Szeredi <miklos@szeredi.hu>
+  Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>
 
   This program can be distributed under the terms of the GNU GPL.
   See the file COPYING.
@@ -18,9 +18,6 @@
 /** Max number of pages that can be used in a single read request */
 #define FUSE_MAX_PAGES_PER_REQ 32
 
-/** If more requests are outstanding, then the operation will block */
-#define FUSE_MAX_OUTSTANDING 10
-
 /** It could be as large as PATH_MAX, but would that have any uses? */
 #define FUSE_NAME_MAX 1024
 
@@ -131,8 +128,8 @@ struct fuse_conn;
  * A request to the client
  */
 struct fuse_req {
-       /** This can be on either unused_list, pending processing or
-           io lists in fuse_conn */
+       /** This can be on either pending processing or io lists in
+           fuse_conn */
        struct list_head list;
 
        /** Entry on the background list */
@@ -144,15 +141,12 @@ struct fuse_req {
        /*
         * The following bitfields are either set once before the
         * request is queued or setting/clearing them is protected by
-        * fuse_lock
+        * fuse_conn->lock
         */
 
        /** True if the request has reply */
        unsigned isreply:1;
 
-       /** The request is preallocated */
-       unsigned preallocated:1;
-
        /** The request was interrupted */
        unsigned interrupted:1;
 
@@ -213,6 +207,9 @@ struct fuse_req {
  * unmounted.
  */
 struct fuse_conn {
+       /** Lock protecting accessess to  members of this structure */
+       spinlock_t lock;
+
        /** The user id for this mount */
        uid_t user_id;
 
@@ -244,19 +241,9 @@ struct fuse_conn {
            interrupted request) */
        struct list_head background;
 
-       /** Controls the maximum number of outstanding requests */
-       struct semaphore outstanding_sem;
-
-       /** This counts the number of outstanding requests if
-           outstanding_sem would go negative */
-       unsigned outstanding_debt;
-
        /** RW semaphore for exclusion with fuse_put_super() */
        struct rw_semaphore sbput_sem;
 
-       /** The list of unused requests */
-       struct list_head unused_list;
-
        /** The next unique request id */
        u64 reqctr;
 
@@ -318,6 +305,9 @@ struct fuse_conn {
 
        /** kobject */
        struct kobject kobj;
+
+       /** O_ASYNC requests */
+       struct fasync_struct *fasync;
 };
 
 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
@@ -346,22 +336,7 @@ static inline u64 get_node_id(struct inode *inode)
 }
 
 /** Device operations */
-extern struct file_operations fuse_dev_operations;
-
-/**
- * This is the single global spinlock which protects FUSE's structures
- *
- * The following data is protected by this lock:
- *
- *  - the private_data field of the device file
- *  - the s_fs_info field of the super block
- *  - unused_list, pending, processing lists in fuse_conn
- *  - background list in fuse_conn
- *  - the unique request ID counter reqctr in fuse_conn
- *  - the sb (super_block) field in fuse_conn
- *  - the file (device file) field in fuse_conn
- */
-extern spinlock_t fuse_lock;
+extern const struct file_operations fuse_dev_operations;
 
 /**
  * Get a filled in inode
@@ -461,11 +436,11 @@ void fuse_reset_request(struct fuse_req *req);
 /**
  * Reserve a preallocated request
  */
-struct fuse_req *fuse_get_request(struct fuse_conn *fc);
+struct fuse_req *fuse_get_req(struct fuse_conn *fc);
 
 /**
- * Decrement reference count of a request.  If count goes to zero put
- * on unused list (preallocated) or free request (not preallocated).
+ * Decrement reference count of a request.  If count goes to zero free
+ * the request.
  */
 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
 
@@ -487,7 +462,7 @@ void request_send_background(struct fuse_conn *fc, struct fuse_req *req);
 /**
  * Release inodes and file associated with background request
  */
-void fuse_release_background(struct fuse_req *req);
+void fuse_release_background(struct fuse_conn *fc, struct fuse_req *req);
 
 /* Abort all requests */
 void fuse_abort_conn(struct fuse_conn *fc);