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
/*
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* V9FS FID Management
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*
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* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/list.h>
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#define FID_OP 0
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#define FID_WALK 1
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#define FID_CREATE 2
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struct v9fs_fid {
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struct list_head list; /* list of fids associated with a dentry */
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struct list_head active; /* XXX - debug */
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u32 fid;
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unsigned char fidopen; /* set when fid is opened */
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unsigned char fidclunked; /* set when fid has already been clunked */
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struct v9fs_qid qid;
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u32 iounit;
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/* readdir stuff */
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int rdir_fpos;
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loff_t rdir_pos;
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struct v9fs_fcall *rdir_fcall;
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/* management stuff */
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uid_t uid; /* user associated with this fid */
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/* private data */
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struct file *filp; /* backpointer to File struct for open files */
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struct v9fs_session_info *v9ses; /* session info for this FID */
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};
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struct v9fs_fid *v9fs_fid_lookup(struct dentry *dentry);
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struct v9fs_fid *v9fs_fid_get_created(struct dentry *);
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void v9fs_fid_destroy(struct v9fs_fid *fid);
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struct v9fs_fid *v9fs_fid_create(struct v9fs_session_info *, int fid);
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int v9fs_fid_insert(struct v9fs_fid *fid, struct dentry *dentry);
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