[linux-2.6-block.git] / fs / 9p / vfs_dentry.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/9p/vfs_dentry.c
 *
 * 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/inet.h>
#include <linux/namei.h>
#include <linux/idr.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;
	p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
		 dentry, dentry);
	hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
		p9_client_clunk(hlist_entry(p, struct p9_fid, dlist));
	dentry->d_fsdata = NULL;
}

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);
		if (retval == -ENOENT)
			return 0;
		if (retval < 0)
			return retval;
	}
out_valid:
	return 1;
}

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,
};

const struct dentry_operations v9fs_dentry_operations = {
	.d_delete = always_delete_dentry,
	.d_release = v9fs_dentry_release,
};
Commit	Line	Data
1f327613	1	// SPDX-License-Identifier: GPL-2.0-only
e69e7fe5 EVH	2	/*
	3	* linux/fs/9p/vfs_dentry.c
	4	*
	5	* This file contians vfs dentry ops for the 9P2000 protocol.
	6	*
	7	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	8	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
e69e7fe5 EVH	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/errno.h>
	13	#include <linux/fs.h>
	14	#include <linux/file.h>
	15	#include <linux/pagemap.h>
	16	#include <linux/stat.h>
	17	#include <linux/string.h>
e69e7fe5 EVH	18	#include <linux/inet.h>
	19	#include <linux/namei.h>
	20	#include <linux/idr.h>
e8edc6e0	21	#include <linux/sched.h>
5a0e3ad6	22	#include <linux/slab.h>
bd238fb4 LI	23	#include <net/9p/9p.h>
bd238fb4 LI	24	#include <net/9p/client.h>
e69e7fe5	25
e69e7fe5	26	#include "v9fs.h"
e69e7fe5	27	#include "v9fs_vfs.h"
e69e7fe5 EVH	28	#include "fid.h"
e69e7fe5 EVH	29
e03abc0c EVH	30	/**
	31	* v9fs_cached_dentry_delete - called when dentry refcount equals 0
	32	* @dentry: dentry in question
	33	*
e03abc0c	34	*/
fe15ce44	35	static int v9fs_cached_dentry_delete(const struct dentry *dentry)
e03abc0c	36	{
4b8e9923 AV	37	p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
4b8e9923 AV	38	dentry, dentry);
e03abc0c	39
a950a652	40	/* Don't cache negative dentries */
2b0143b5	41	if (d_really_is_negative(dentry))
e03abc0c	42	return 1;
e03abc0c EVH	43	return 0;
	44	}
	45
e69e7fe5 EVH	46	/**
	47	* v9fs_dentry_release - called when dentry is going to be freed
	48	* @dentry: dentry that is being release
	49	*
	50	*/
	51
98cd3fb0	52	static void v9fs_dentry_release(struct dentry *dentry)
e69e7fe5	53	{
aaeb7ecf	54	struct hlist_node p, n;
4b8e9923 AV	55	p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
4b8e9923 AV	56	dentry, dentry);
aaeb7ecf AV	57	hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
	58	p9_client_clunk(hlist_entry(p, struct p9_fid, dlist));
	59	dentry->d_fsdata = NULL;
e69e7fe5 EVH	60	}
e69e7fe5 EVH	61
0b728e19	62	static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
b3cbea03 AK	63	{
	64	struct p9_fid *fid;
	65	struct inode *inode;
	66	struct v9fs_inode *v9inode;
	67
0b728e19	68	if (flags & LOOKUP_RCU)
b3cbea03 AK	69	return -ECHILD;
b3cbea03 AK	70
2b0143b5	71	inode = d_inode(dentry);
b3cbea03 AK	72	if (!inode)
	73	goto out_valid;
	74
	75	v9inode = V9FS_I(inode);
	76	if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
	77	int retval;
	78	struct v9fs_session_info *v9ses;
	79	fid = v9fs_fid_lookup(dentry);
	80	if (IS_ERR(fid))
	81	return PTR_ERR(fid);
	82
	83	v9ses = v9fs_inode2v9ses(inode);
	84	if (v9fs_proto_dotl(v9ses))
	85	retval = v9fs_refresh_inode_dotl(fid, inode);
	86	else
	87	retval = v9fs_refresh_inode(fid, inode);
f2eda2c6 AK	88	if (retval == -ENOENT)
	89	return 0;
	90	if (retval < 0)
b3cbea03 AK	91	return retval;
	92	}
	93	out_valid:
	94	return 1;
	95	}
	96
a488257c	97	const struct dentry_operations v9fs_cached_dentry_operations = {
b3cbea03	98	.d_revalidate = v9fs_lookup_revalidate,
ecf3d1f1	99	.d_weak_revalidate = v9fs_lookup_revalidate,
e03abc0c EVH	100	.d_delete = v9fs_cached_dentry_delete,
	101	.d_release = v9fs_dentry_release,
	102	};
	103
a488257c	104	const struct dentry_operations v9fs_dentry_operations = {
b26d4cd3	105	.d_delete = always_delete_dentry,
e69e7fe5 EVH	106	.d_release = v9fs_dentry_release,
e69e7fe5 EVH	107	};