| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 |