mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
61a4fa39a3
just set DCACHE_DONTCACHE for "don't cache" mounts... Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* This file contians vfs dentry ops for the 9P2000 protocol.
|
|
*
|
|
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
|
|
* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/string.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <net/9p/9p.h>
|
|
#include <net/9p/client.h>
|
|
|
|
#include "v9fs.h"
|
|
#include "v9fs_vfs.h"
|
|
#include "fid.h"
|
|
|
|
/**
|
|
* v9fs_cached_dentry_delete - called when dentry refcount equals 0
|
|
* @dentry: dentry in question
|
|
*
|
|
*/
|
|
static int v9fs_cached_dentry_delete(const struct dentry *dentry)
|
|
{
|
|
p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
|
|
dentry, dentry);
|
|
|
|
/* Don't cache negative dentries */
|
|
if (d_really_is_negative(dentry))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_dentry_release - called when dentry is going to be freed
|
|
* @dentry: dentry that is being release
|
|
*
|
|
*/
|
|
|
|
static void v9fs_dentry_release(struct dentry *dentry)
|
|
{
|
|
struct hlist_node *p, *n;
|
|
struct hlist_head head;
|
|
|
|
p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
|
|
dentry, dentry);
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
hlist_move_list((struct hlist_head *)&dentry->d_fsdata, &head);
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
hlist_for_each_safe(p, n, &head)
|
|
p9_fid_put(hlist_entry(p, struct p9_fid, dlist));
|
|
}
|
|
|
|
static int __v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct p9_fid *fid;
|
|
struct inode *inode;
|
|
struct v9fs_inode *v9inode;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
inode = d_inode(dentry);
|
|
if (!inode)
|
|
goto out_valid;
|
|
|
|
v9inode = V9FS_I(inode);
|
|
if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
|
|
int retval;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9ses = v9fs_inode2v9ses(inode);
|
|
if (v9fs_proto_dotl(v9ses))
|
|
retval = v9fs_refresh_inode_dotl(fid, inode);
|
|
else
|
|
retval = v9fs_refresh_inode(fid, inode);
|
|
p9_fid_put(fid);
|
|
|
|
if (retval == -ENOENT)
|
|
return 0;
|
|
if (retval < 0)
|
|
return retval;
|
|
}
|
|
out_valid:
|
|
return 1;
|
|
}
|
|
|
|
static int v9fs_lookup_revalidate(struct inode *dir, const struct qstr *name,
|
|
struct dentry *dentry, unsigned int flags)
|
|
{
|
|
return __v9fs_lookup_revalidate(dentry, flags);
|
|
}
|
|
|
|
static bool v9fs_dentry_unalias_trylock(const struct dentry *dentry)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_dentry2v9ses(dentry);
|
|
return down_write_trylock(&v9ses->rename_sem);
|
|
}
|
|
|
|
static void v9fs_dentry_unalias_unlock(const struct dentry *dentry)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_dentry2v9ses(dentry);
|
|
up_write(&v9ses->rename_sem);
|
|
}
|
|
|
|
const struct dentry_operations v9fs_cached_dentry_operations = {
|
|
.d_revalidate = v9fs_lookup_revalidate,
|
|
.d_weak_revalidate = __v9fs_lookup_revalidate,
|
|
.d_delete = v9fs_cached_dentry_delete,
|
|
.d_release = v9fs_dentry_release,
|
|
.d_unalias_trylock = v9fs_dentry_unalias_trylock,
|
|
.d_unalias_unlock = v9fs_dentry_unalias_unlock,
|
|
};
|
|
|
|
const struct dentry_operations v9fs_dentry_operations = {
|
|
.d_release = v9fs_dentry_release,
|
|
.d_unalias_trylock = v9fs_dentry_unalias_trylock,
|
|
.d_unalias_unlock = v9fs_dentry_unalias_unlock,
|
|
};
|