1 /* 2 * V9FS FID Management 3 * 4 * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to: 17 * Free Software Foundation 18 * 51 Franklin Street, Fifth Floor 19 * Boston, MA 02111-1301 USA 20 * 21 */ 22 #ifndef FS_9P_FID_H 23 #define FS_9P_FID_H 24 #include <linux/list.h> 25 26 /** 27 * struct v9fs_dentry - 9p private data stored in dentry d_fsdata 28 * @lock: protects the fidlist 29 * @fidlist: list of FIDs currently associated with this dentry 30 * 31 * This structure defines the 9p private data associated with 32 * a particular dentry. In particular, this private data is used 33 * to lookup which 9P FID handle should be used for a particular VFS 34 * operation. FID handles are associated with dentries instead of 35 * inodes in order to more closely map functionality to the Plan 9 36 * expected behavior for FID reclaimation and tracking. 37 * 38 * See Also: Mapping FIDs to Linux VFS model in 39 * Design and Implementation of the Linux 9P File System documentation 40 */ 41 struct v9fs_dentry { 42 spinlock_t lock; /* protect fidlist */ 43 struct list_head fidlist; 44 }; 45 46 struct p9_fid *v9fs_fid_lookup(struct dentry *dentry); 47 struct p9_fid *v9fs_fid_clone(struct dentry *dentry); 48 int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid); 49 struct p9_fid *v9fs_writeback_fid(struct dentry *dentry); 50 #endif 51