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d7385ba137
9pfs can run over assorted transports, so it doesn't have an INET dependency. Drop it and remove the includes of linux/inet.h. NET_9P_FD/trans_fd.o builds without INET or UNIX and is usable over plain file descriptors. However, tcp and unix functionality is still built and would generate runtime failures if used. Add imply INET and UNIX to NET_9P_FD, so functionality is enabled by default but can still be explicitly disabled. This allows configuring 9pfs over Xen with INET and UNIX disabled. Signed-off-by: Jason Andryuk <jandryuk@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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/namei.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_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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*/
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static int v9fs_cached_dentry_delete(const struct dentry *dentry)
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{
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p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
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dentry, dentry);
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/* Don't cache negative dentries */
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if (d_really_is_negative(dentry))
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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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static void v9fs_dentry_release(struct dentry *dentry)
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{
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struct hlist_node *p, *n;
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p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
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dentry, dentry);
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hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
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p9_fid_put(hlist_entry(p, struct p9_fid, dlist));
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dentry->d_fsdata = NULL;
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}
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static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
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{
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struct p9_fid *fid;
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struct inode *inode;
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struct v9fs_inode *v9inode;
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if (flags & LOOKUP_RCU)
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return -ECHILD;
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inode = d_inode(dentry);
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if (!inode)
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goto out_valid;
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v9inode = V9FS_I(inode);
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if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
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int retval;
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struct v9fs_session_info *v9ses;
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fid = v9fs_fid_lookup(dentry);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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v9ses = v9fs_inode2v9ses(inode);
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if (v9fs_proto_dotl(v9ses))
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retval = v9fs_refresh_inode_dotl(fid, inode);
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else
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retval = v9fs_refresh_inode(fid, inode);
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p9_fid_put(fid);
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if (retval == -ENOENT)
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return 0;
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if (retval < 0)
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return retval;
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}
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out_valid:
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return 1;
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}
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const struct dentry_operations v9fs_cached_dentry_operations = {
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.d_revalidate = v9fs_lookup_revalidate,
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.d_weak_revalidate = v9fs_lookup_revalidate,
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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 = always_delete_dentry,
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.d_release = v9fs_dentry_release,
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};
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