/*
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.
/** 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
+/** Maximum number of outstanding background requests */
+#define FUSE_MAX_BACKGROUND 10
/** It could be as large as PATH_MAX, but would that have any uses? */
#define FUSE_NAME_MAX 1024
* 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 */
/*
* 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;
/** Data is being copied to/from the request */
unsigned locked:1;
+ /** Request is counted as "waiting" */
+ unsigned waiting:1;
+
/** State of the request */
enum fuse_req_state state;
* 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;
interrupted request) */
struct list_head background;
- /** Controls the maximum number of outstanding requests */
- struct semaphore outstanding_sem;
+ /** Number of requests currently in the background */
+ unsigned num_background;
- /** This counts the number of outstanding requests if
- outstanding_sem would go negative */
- unsigned outstanding_debt;
+ /** Flag indicating if connection is blocked. This will be
+ the case before the INIT reply is received, and if there
+ are too many outstading backgrounds requests */
+ int blocked;
- /** RW semaphore for exclusion with fuse_put_super() */
- struct rw_semaphore sbput_sem;
-
- /** The list of unused requests */
- struct list_head unused_list;
+ /** waitq for blocked connection */
+ wait_queue_head_t blocked_waitq;
/** The next unique request id */
u64 reqctr;
- /** Mount is active */
- unsigned mounted;
-
/** Connection established, cleared on umount, connection
abort and device release */
unsigned connected;
/** kobject */
struct kobject kobj;
+
+ /** O_ASYNC requests */
+ struct fasync_struct *fasync;
};
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
/** Device operations */
extern const 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;
-
/**
* Get a filled in inode
*/
/**
* 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);
void request_send_background(struct fuse_conn *fc, struct fuse_req *req);
/**
- * Release inodes and file associated with background request
+ * Remove request from the the background list
*/
-void fuse_release_background(struct fuse_req *req);
+void fuse_remove_background(struct fuse_conn *fc, struct fuse_req *req);
-/* Abort all requests */
+/** Abort all requests */
void fuse_abort_conn(struct fuse_conn *fc);
/**