[linux-block.git] / fs / 9p / vfs_dentry.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/inet.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;

	p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
		 dentry, dentry);
	hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
		p9_fid_put(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);
		p9_fid_put(fid);

		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	2	/*
e69e7fe5 EVH	3	* This file contians vfs dentry ops for the 9P2000 protocol.
	4	*
	5	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	6	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
e69e7fe5 EVH	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/errno.h>
	11	#include <linux/fs.h>
	12	#include <linux/file.h>
	13	#include <linux/pagemap.h>
	14	#include <linux/stat.h>
	15	#include <linux/string.h>
e69e7fe5 EVH	16	#include <linux/inet.h>
e69e7fe5 EVH	17	#include <linux/namei.h>
e8edc6e0	18	#include <linux/sched.h>
5a0e3ad6	19	#include <linux/slab.h>
bd238fb4 LI	20	#include <net/9p/9p.h>
bd238fb4 LI	21	#include <net/9p/client.h>
e69e7fe5	22
e69e7fe5	23	#include "v9fs.h"
e69e7fe5	24	#include "v9fs_vfs.h"
e69e7fe5 EVH	25	#include "fid.h"
e69e7fe5 EVH	26
e03abc0c EVH	27	/**
	28	* v9fs_cached_dentry_delete - called when dentry refcount equals 0
	29	* @dentry: dentry in question
	30	*
e03abc0c	31	*/
fe15ce44	32	static int v9fs_cached_dentry_delete(const struct dentry *dentry)
e03abc0c	33	{
4b8e9923 AV	34	p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
4b8e9923 AV	35	dentry, dentry);
e03abc0c	36
a950a652	37	/* Don't cache negative dentries */
2b0143b5	38	if (d_really_is_negative(dentry))
e03abc0c	39	return 1;
e03abc0c EVH	40	return 0;
	41	}
	42
e69e7fe5 EVH	43	/**
	44	* v9fs_dentry_release - called when dentry is going to be freed
	45	* @dentry: dentry that is being release
	46	*
	47	*/
	48
98cd3fb0	49	static void v9fs_dentry_release(struct dentry *dentry)
e69e7fe5	50	{
aaeb7ecf	51	struct hlist_node p, n;
6e195b0f	52
4b8e9923 AV	53	p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
4b8e9923 AV	54	dentry, dentry);
aaeb7ecf	55	hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
b48dbb99	56	p9_fid_put(hlist_entry(p, struct p9_fid, dlist));
aaeb7ecf	57	dentry->d_fsdata = NULL;
e69e7fe5 EVH	58	}
e69e7fe5 EVH	59
0b728e19	60	static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
b3cbea03 AK	61	{
	62	struct p9_fid *fid;
	63	struct inode *inode;
	64	struct v9fs_inode *v9inode;
	65
0b728e19	66	if (flags & LOOKUP_RCU)
b3cbea03 AK	67	return -ECHILD;
b3cbea03 AK	68
2b0143b5	69	inode = d_inode(dentry);
b3cbea03 AK	70	if (!inode)
	71	goto out_valid;
	72
	73	v9inode = V9FS_I(inode);
	74	if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
	75	int retval;
	76	struct v9fs_session_info *v9ses;
6e195b0f	77
b3cbea03 AK	78	fid = v9fs_fid_lookup(dentry);
	79	if (IS_ERR(fid))
	80	return PTR_ERR(fid);
	81
	82	v9ses = v9fs_inode2v9ses(inode);
	83	if (v9fs_proto_dotl(v9ses))
	84	retval = v9fs_refresh_inode_dotl(fid, inode);
	85	else
	86	retval = v9fs_refresh_inode(fid, inode);
b48dbb99	87	p9_fid_put(fid);
6636b6dc	88
f2eda2c6 AK	89	if (retval == -ENOENT)
	90	return 0;
	91	if (retval < 0)
b3cbea03 AK	92	return retval;
	93	}
	94	out_valid:
	95	return 1;
	96	}
	97
a488257c	98	const struct dentry_operations v9fs_cached_dentry_operations = {
b3cbea03	99	.d_revalidate = v9fs_lookup_revalidate,
ecf3d1f1	100	.d_weak_revalidate = v9fs_lookup_revalidate,
e03abc0c EVH	101	.d_delete = v9fs_cached_dentry_delete,
	102	.d_release = v9fs_dentry_release,
	103	};
	104
a488257c	105	const struct dentry_operations v9fs_dentry_operations = {
b26d4cd3	106	.d_delete = always_delete_dentry,
e69e7fe5 EVH	107	.d_release = v9fs_dentry_release,
e69e7fe5 EVH	108	};