forked from luck/tmp_suning_uos_patched
46f6dac259
v9fs has been plagued by an over-complicated approach trying to map Linux dentry semantics to Plan 9 fid semantics. Our previous approach called for aggressive flushing of the dcache resulting in several problems (including wierd cwd behavior when running /bin/pwd). This patch dramatically simplifies our handling of this fid management. Fids will not be clunked as promptly, but the new approach is more functionally correct. We now clunk un-open fids only when their dentry ref_count reaches 0 (and d_delete is called). Another simplification is we no longer seek to match fids to the process-id or uid of the action initiator. The uid-matching will need to be revisited when we fix the security model. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/*
|
|
* V9FS FID Management
|
|
*
|
|
* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to:
|
|
* Free Software Foundation
|
|
* 51 Franklin Street, Fifth Floor
|
|
* Boston, MA 02111-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/list.h>
|
|
|
|
#define FID_OP 0
|
|
#define FID_WALK 1
|
|
#define FID_CREATE 2
|
|
|
|
struct v9fs_fid {
|
|
struct list_head list; /* list of fids associated with a dentry */
|
|
struct list_head active; /* XXX - debug */
|
|
|
|
u32 fid;
|
|
unsigned char fidopen; /* set when fid is opened */
|
|
unsigned char fidclunked; /* set when fid has already been clunked */
|
|
|
|
struct v9fs_qid qid;
|
|
u32 iounit;
|
|
|
|
/* readdir stuff */
|
|
int rdir_fpos;
|
|
loff_t rdir_pos;
|
|
struct v9fs_fcall *rdir_fcall;
|
|
|
|
/* management stuff */
|
|
uid_t uid; /* user associated with this fid */
|
|
|
|
/* private data */
|
|
struct file *filp; /* backpointer to File struct for open files */
|
|
struct v9fs_session_info *v9ses; /* session info for this FID */
|
|
};
|
|
|
|
struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry);
|
|
struct v9fs_fid *v9fs_fid_get_created(struct dentry *);
|
|
void v9fs_fid_destroy(struct v9fs_fid *fid);
|
|
struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *, int fid);
|
|
int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry);
|