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https://github.com/edk2-porting/linux-next.git
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fe15ce446b
Change d_delete from a dentry deletion notification to a dentry caching advise, more like ->drop_inode. Require it to be constant and idempotent, and not take d_lock. This is how all existing filesystems use the callback anyway. This makes fine grained dentry locking of dput and dentry lru scanning much simpler. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
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* linux/fs/9p/vfs_dentry.c
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*
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* This file contians vfs dentry ops for the 9P2000 protocol.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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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 version 2
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* as published by the Free Software Foundation.
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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/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/pagemap.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/inet.h>
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#include <linux/namei.h>
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#include <linux/idr.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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/**
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* v9fs_dentry_delete - called when dentry refcount equals 0
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* @dentry: dentry in question
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*
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* By returning 1 here we should remove cacheing of unused
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* dentry components.
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*
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*/
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static int v9fs_dentry_delete(const struct dentry *dentry)
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{
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P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
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dentry);
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return 1;
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}
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/**
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* v9fs_cached_dentry_delete - called when dentry refcount equals 0
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* @dentry: dentry in question
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*
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* Only return 1 if our inode is invalid. Only non-synthetic files
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* (ones without mtime == 0) should be calling this function.
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*
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*/
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static int v9fs_cached_dentry_delete(const struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
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dentry);
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if(!inode)
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return 1;
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return 0;
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}
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/**
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* v9fs_dentry_release - called when dentry is going to be freed
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* @dentry: dentry that is being release
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*
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*/
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void v9fs_dentry_release(struct dentry *dentry)
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{
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struct v9fs_dentry *dent;
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struct p9_fid *temp, *current_fid;
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P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
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dentry);
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dent = dentry->d_fsdata;
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if (dent) {
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list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
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dlist) {
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p9_client_clunk(current_fid);
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}
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kfree(dent);
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dentry->d_fsdata = NULL;
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}
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}
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const struct dentry_operations v9fs_cached_dentry_operations = {
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.d_delete = v9fs_cached_dentry_delete,
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.d_release = v9fs_dentry_release,
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};
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const struct dentry_operations v9fs_dentry_operations = {
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.d_delete = v9fs_dentry_delete,
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.d_release = v9fs_dentry_release,
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};
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