[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / nfsd / nfs4recover.c

/*
*  linux/fs/nfsd/nfs4recover.c
*
*  Copyright (c) 2004 The Regents of the University of Michigan.
*  All rights reserved.
*
*  Andy Adamson <andros@citi.umich.edu>
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions
*  are met:
*
*  1. Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*  2. Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution.
*  3. Neither the name of the University nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
*  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
*  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
*  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
*  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
*  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
*  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
*  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#include <linux/err.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfs4.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>
#include <linux/param.h>
#include <linux/file.h>
#include <linux/namei.h>
#include <asm/uaccess.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>


#define NFSDDBG_FACILITY                NFSDDBG_PROC

/* Globals */
static struct nameidata rec_dir;
static int rec_dir_init = 0;

static void
nfs4_save_user(uid_t *saveuid, gid_t *savegid)
{
	*saveuid = current->fsuid;
	*savegid = current->fsgid;
	current->fsuid = 0;
	current->fsgid = 0;
}

static void
nfs4_reset_user(uid_t saveuid, gid_t savegid)
{
	current->fsuid = saveuid;
	current->fsgid = savegid;
}

static void
md5_to_hex(char *out, char *md5)
{
	int i;

	for (i=0; i<16; i++) {
		unsigned char c = md5[i];

		*out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
		*out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
	}
	*out = '\0';
}

__be32
nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
{
	struct xdr_netobj cksum;
	struct hash_desc desc;
	struct scatterlist sg[1];
	__be32 status = nfserr_resource;

	dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
			clname->len, clname->data);
	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(desc.tfm))
		goto out_no_tfm;
	cksum.len = crypto_hash_digestsize(desc.tfm);
	cksum.data = kmalloc(cksum.len, GFP_KERNEL);
	if (cksum.data == NULL)
 		goto out;

	sg[0].page = virt_to_page(clname->data);
	sg[0].offset = offset_in_page(clname->data);
	sg[0].length = clname->len;

	if (crypto_hash_digest(&desc, sg, sg->length, cksum.data))
		goto out;

	md5_to_hex(dname, cksum.data);

	kfree(cksum.data);
	status = nfs_ok;
out:
	crypto_free_hash(desc.tfm);
out_no_tfm:
	return status;
}

static void
nfsd4_sync_rec_dir(void)
{
	mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
	nfsd_sync_dir(rec_dir.dentry);
	mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
}

int
nfsd4_create_clid_dir(struct nfs4_client *clp)
{
	char *dname = clp->cl_recdir;
	struct dentry *dentry;
	uid_t uid;
	gid_t gid;
	int status;

	dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);

	if (!rec_dir_init || clp->cl_firststate)
		return 0;

	nfs4_save_user(&uid, &gid);

	/* lock the parent */
	mutex_lock(&rec_dir.dentry->d_inode->i_mutex);

	dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
	if (IS_ERR(dentry)) {
		status = PTR_ERR(dentry);
		goto out_unlock;
	}
	status = -EEXIST;
	if (dentry->d_inode) {
		dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
		goto out_put;
	}
	status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
out_put:
	dput(dentry);
out_unlock:
	mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
	if (status == 0) {
		clp->cl_firststate = 1;
		nfsd4_sync_rec_dir();
	}
	nfs4_reset_user(uid, gid);
	dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
	return status;
}

typedef int (recdir_func)(struct dentry *, struct dentry *);

struct dentry_list {
	struct dentry *dentry;
	struct list_head list;
};

struct dentry_list_arg {
	struct list_head dentries;
	struct dentry *parent;
};

static int
nfsd4_build_dentrylist(void *arg, const char *name, int namlen,
		loff_t offset, u64 ino, unsigned int d_type)
{
	struct dentry_list_arg *dla = arg;
	struct list_head *dentries = &dla->dentries;
	struct dentry *parent = dla->parent;
	struct dentry *dentry;
	struct dentry_list *child;

	if (name && isdotent(name, namlen))
		return 0;
	dentry = lookup_one_len(name, parent, namlen);
	if (IS_ERR(dentry))
		return PTR_ERR(dentry);
	child = kmalloc(sizeof(*child), GFP_KERNEL);
	if (child == NULL)
		return -ENOMEM;
	child->dentry = dentry;
	list_add(&child->list, dentries);
	return 0;
}

static int
nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
{
	struct file *filp;
	struct dentry_list_arg dla = {
		.parent = dir,
	};
	struct list_head *dentries = &dla.dentries;
	struct dentry_list *child;
	uid_t uid;
	gid_t gid;
	int status;

	if (!rec_dir_init)
		return 0;

	nfs4_save_user(&uid, &gid);

	filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
	status = PTR_ERR(filp);
	if (IS_ERR(filp))
		goto out;
	INIT_LIST_HEAD(dentries);
	status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla);
	fput(filp);
	while (!list_empty(dentries)) {
		child = list_entry(dentries->next, struct dentry_list, list);
		status = f(dir, child->dentry);
		if (status)
			goto out;
		list_del(&child->list);
		dput(child->dentry);
		kfree(child);
	}
out:
	while (!list_empty(dentries)) {
		child = list_entry(dentries->next, struct dentry_list, list);
		list_del(&child->list);
		dput(child->dentry);
		kfree(child);
	}
	nfs4_reset_user(uid, gid);
	return status;
}

static int
nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry)
{
	int status;

	if (!S_ISREG(dir->d_inode->i_mode)) {
		printk("nfsd4: non-file found in client recovery directory\n");
		return -EINVAL;
	}
	mutex_lock(&dir->d_inode->i_mutex);
	status = vfs_unlink(dir->d_inode, dentry);
	mutex_unlock(&dir->d_inode->i_mutex);
	return status;
}

static int
nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry)
{
	int status;

	/* For now this directory should already be empty, but we empty it of
	 * any regular files anyway, just in case the directory was created by
	 * a kernel from the future.... */
	nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
	mutex_lock(&dir->d_inode->i_mutex);
	status = vfs_rmdir(dir->d_inode, dentry);
	mutex_unlock(&dir->d_inode->i_mutex);
	return status;
}

static int
nfsd4_unlink_clid_dir(char *name, int namlen)
{
	struct dentry *dentry;
	int status;

	dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);

	mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
	dentry = lookup_one_len(name, rec_dir.dentry, namlen);
	mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
	if (IS_ERR(dentry)) {
		status = PTR_ERR(dentry);
		return status;
	}
	status = -ENOENT;
	if (!dentry->d_inode)
		goto out;

	status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
out:
	dput(dentry);
	return status;
}

void
nfsd4_remove_clid_dir(struct nfs4_client *clp)
{
	uid_t uid;
	gid_t gid;
	int status;

	if (!rec_dir_init || !clp->cl_firststate)
		return;

	clp->cl_firststate = 0;
	nfs4_save_user(&uid, &gid);
	status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
	nfs4_reset_user(uid, gid);
	if (status == 0)
		nfsd4_sync_rec_dir();
	if (status)
		printk("NFSD: Failed to remove expired client state directory"
				" %.*s\n", HEXDIR_LEN, clp->cl_recdir);
	return;
}

static int
purge_old(struct dentry *parent, struct dentry *child)
{
	int status;

	if (nfs4_has_reclaimed_state(child->d_name.name))
		return 0;

	status = nfsd4_clear_clid_dir(parent, child);
	if (status)
		printk("failed to remove client recovery directory %s\n",
				child->d_name.name);
	/* Keep trying, success or failure: */
	return 0;
}

void
nfsd4_recdir_purge_old(void) {
	int status;

	if (!rec_dir_init)
		return;
	status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
	if (status == 0)
		nfsd4_sync_rec_dir();
	if (status)
		printk("nfsd4: failed to purge old clients from recovery"
			" directory %s\n", rec_dir.dentry->d_name.name);
	return;
}

static int
load_recdir(struct dentry *parent, struct dentry *child)
{
	if (child->d_name.len != HEXDIR_LEN - 1) {
		printk("nfsd4: illegal name %s in recovery directory\n",
				child->d_name.name);
		/* Keep trying; maybe the others are OK: */
		return 0;
	}
	nfs4_client_to_reclaim(child->d_name.name);
	return 0;
}

int
nfsd4_recdir_load(void) {
	int status;

	status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
	if (status)
		printk("nfsd4: failed loading clients from recovery"
			" directory %s\n", rec_dir.dentry->d_name.name);
	return status;
}

/*
 * Hold reference to the recovery directory.
 */

void
nfsd4_init_recdir(char *rec_dirname)
{
	uid_t			uid = 0;
	gid_t			gid = 0;
	int 			status;

	printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
			rec_dirname);

	BUG_ON(rec_dir_init);

	nfs4_save_user(&uid, &gid);

	status = path_lookup(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
			&rec_dir);
	if (status)
		printk("NFSD: unable to find recovery directory %s\n",
				rec_dirname);

	if (!status)
		rec_dir_init = 1;
	nfs4_reset_user(uid, gid);
}

void
nfsd4_shutdown_recdir(void)
{
	if (!rec_dir_init)
		return;
	rec_dir_init = 0;
	path_release(&rec_dir);
}
Commit	Line	Data
a55370a3 N	1	/*
	2	* linux/fs/nfsd/nfs4recover.c
	3	*
	4	* Copyright (c) 2004 The Regents of the University of Michigan.
	5	* All rights reserved.
	6	*
	7	* Andy Adamson <andros@citi.umich.edu>
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. Neither the name of the University nor the names of its
	19	* contributors may be used to endorse or promote products derived
	20	* from this software without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	25	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	27	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	28	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	29	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	30	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	31	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	32	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*
	34	*/
	35
35058687	36	#include <linux/err.h>
a55370a3 N	37	#include <linux/sunrpc/svc.h>
	38	#include <linux/nfsd/nfsd.h>
	39	#include <linux/nfs4.h>
	40	#include <linux/nfsd/state.h>
	41	#include <linux/nfsd/xdr4.h>
190e4fbf N	42	#include <linux/param.h>
	43	#include <linux/file.h>
	44	#include <linux/namei.h>
a55370a3 N	45	#include <asm/uaccess.h>
	46	#include <asm/scatterlist.h>
	47	#include <linux/crypto.h>
	48
	49
	50	#define NFSDDBG_FACILITY NFSDDBG_PROC
	51
190e4fbf	52	/* Globals */
190e4fbf N	53	static struct nameidata rec_dir;
	54	static int rec_dir_init = 0;
	55
	56	static void
	57	nfs4_save_user(uid_t saveuid, gid_t savegid)
	58	{
	59	*saveuid = current->fsuid;
	60	*savegid = current->fsgid;
	61	current->fsuid = 0;
	62	current->fsgid = 0;
	63	}
	64
	65	static void
	66	nfs4_reset_user(uid_t saveuid, gid_t savegid)
	67	{
	68	current->fsuid = saveuid;
	69	current->fsgid = savegid;
	70	}
	71
a55370a3 N	72	static void
	73	md5_to_hex(char out, char md5)
	74	{
	75	int i;
	76
	77	for (i=0; i<16; i++) {
	78	unsigned char c = md5[i];
	79
	80	out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)('a'-'9'-1);
	81	out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)('a'-'9'-1);
	82	}
	83	*out = '\0';
	84	}
	85
b37ad28b	86	__be32
a55370a3 N	87	nfs4_make_rec_clidname(char dname, struct xdr_netobj clname)
	88	{
	89	struct xdr_netobj cksum;
35058687	90	struct hash_desc desc;
a55370a3	91	struct scatterlist sg[1];
b37ad28b	92	__be32 status = nfserr_resource;
a55370a3 N	93
	94	dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
	95	clname->len, clname->data);
35058687 HX	96	desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
	97	desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
	98	if (IS_ERR(desc.tfm))
	99	goto out_no_tfm;
	100	cksum.len = crypto_hash_digestsize(desc.tfm);
a55370a3 N	101	cksum.data = kmalloc(cksum.len, GFP_KERNEL);
	102	if (cksum.data == NULL)
	103	goto out;
a55370a3 N	104
	105	sg[0].page = virt_to_page(clname->data);
	106	sg[0].offset = offset_in_page(clname->data);
	107	sg[0].length = clname->len;
	108
35058687 HX	109	if (crypto_hash_digest(&desc, sg, sg->length, cksum.data))
35058687 HX	110	goto out;
a55370a3 N	111
	112	md5_to_hex(dname, cksum.data);
	113
	114	kfree(cksum.data);
	115	status = nfs_ok;
	116	out:
35058687 HX	117	crypto_free_hash(desc.tfm);
35058687 HX	118	out_no_tfm:
a55370a3 N	119	return status;
a55370a3 N	120	}
190e4fbf	121
a6ccbbb8 N	122	static void
a6ccbbb8 N	123	nfsd4_sync_rec_dir(void)
c7b9a459	124	{
1b1dcc1b	125	mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
a6ccbbb8	126	nfsd_sync_dir(rec_dir.dentry);
1b1dcc1b	127	mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
c7b9a459 N	128	}
	129
	130	int
	131	nfsd4_create_clid_dir(struct nfs4_client *clp)
	132	{
	133	char *dname = clp->cl_recdir;
	134	struct dentry *dentry;
	135	uid_t uid;
	136	gid_t gid;
	137	int status;
	138
	139	dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
	140
	141	if (!rec_dir_init \|\| clp->cl_firststate)
	142	return 0;
	143
	144	nfs4_save_user(&uid, &gid);
	145
	146	/* lock the parent */
1b1dcc1b	147	mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
c7b9a459 N	148
	149	dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
	150	if (IS_ERR(dentry)) {
	151	status = PTR_ERR(dentry);
	152	goto out_unlock;
	153	}
	154	status = -EEXIST;
	155	if (dentry->d_inode) {
	156	dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
	157	goto out_put;
	158	}
	159	status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
	160	out_put:
	161	dput(dentry);
	162	out_unlock:
1b1dcc1b	163	mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
c7b9a459 N	164	if (status == 0) {
c7b9a459 N	165	clp->cl_firststate = 1;
a6ccbbb8	166	nfsd4_sync_rec_dir();
c7b9a459 N	167	}
	168	nfs4_reset_user(uid, gid);
	169	dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
	170	return status;
	171	}
	172
190e4fbf N	173	typedef int (recdir_func)(struct dentry , struct dentry );
	174
	175	struct dentry_list {
	176	struct dentry *dentry;
	177	struct list_head list;
	178	};
	179
	180	struct dentry_list_arg {
	181	struct list_head dentries;
	182	struct dentry *parent;
	183	};
	184
	185	static int
	186	nfsd4_build_dentrylist(void arg, const char name, int namlen,
afefdbb2	187	loff_t offset, u64 ino, unsigned int d_type)
190e4fbf N	188	{
	189	struct dentry_list_arg *dla = arg;
	190	struct list_head *dentries = &dla->dentries;
	191	struct dentry *parent = dla->parent;
	192	struct dentry *dentry;
	193	struct dentry_list *child;
	194
	195	if (name && isdotent(name, namlen))
b37ad28b	196	return 0;
190e4fbf N	197	dentry = lookup_one_len(name, parent, namlen);
	198	if (IS_ERR(dentry))
	199	return PTR_ERR(dentry);
	200	child = kmalloc(sizeof(*child), GFP_KERNEL);
	201	if (child == NULL)
	202	return -ENOMEM;
	203	child->dentry = dentry;
	204	list_add(&child->list, dentries);
	205	return 0;
	206	}
	207
	208	static int
	209	nfsd4_list_rec_dir(struct dentry dir, recdir_func f)
	210	{
	211	struct file *filp;
	212	struct dentry_list_arg dla = {
	213	.parent = dir,
	214	};
	215	struct list_head *dentries = &dla.dentries;
	216	struct dentry_list *child;
	217	uid_t uid;
	218	gid_t gid;
	219	int status;
	220
	221	if (!rec_dir_init)
	222	return 0;
	223
	224	nfs4_save_user(&uid, &gid);
	225
d22749b6	226	filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
190e4fbf N	227	status = PTR_ERR(filp);
	228	if (IS_ERR(filp))
	229	goto out;
	230	INIT_LIST_HEAD(dentries);
	231	status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla);
	232	fput(filp);
	233	while (!list_empty(dentries)) {
	234	child = list_entry(dentries->next, struct dentry_list, list);
	235	status = f(dir, child->dentry);
	236	if (status)
	237	goto out;
	238	list_del(&child->list);
	239	dput(child->dentry);
	240	kfree(child);
	241	}
	242	out:
	243	while (!list_empty(dentries)) {
	244	child = list_entry(dentries->next, struct dentry_list, list);
	245	list_del(&child->list);
	246	dput(child->dentry);
	247	kfree(child);
	248	}
	249	nfs4_reset_user(uid, gid);
	250	return status;
	251	}
	252
c7b9a459 N	253	static int
	254	nfsd4_remove_clid_file(struct dentry dir, struct dentry dentry)
	255	{
	256	int status;
	257
	258	if (!S_ISREG(dir->d_inode->i_mode)) {
	259	printk("nfsd4: non-file found in client recovery directory\n");
	260	return -EINVAL;
	261	}
1b1dcc1b	262	mutex_lock(&dir->d_inode->i_mutex);
c7b9a459	263	status = vfs_unlink(dir->d_inode, dentry);
1b1dcc1b	264	mutex_unlock(&dir->d_inode->i_mutex);
c7b9a459 N	265	return status;
	266	}
	267
	268	static int
	269	nfsd4_clear_clid_dir(struct dentry dir, struct dentry dentry)
	270	{
	271	int status;
	272
	273	/* For now this directory should already be empty, but we empty it of
	274	* any regular files anyway, just in case the directory was created by
	275	* a kernel from the future.... */
	276	nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
1b1dcc1b	277	mutex_lock(&dir->d_inode->i_mutex);
c7b9a459	278	status = vfs_rmdir(dir->d_inode, dentry);
1b1dcc1b	279	mutex_unlock(&dir->d_inode->i_mutex);
c7b9a459 N	280	return status;
	281	}
	282
	283	static int
	284	nfsd4_unlink_clid_dir(char *name, int namlen)
	285	{
	286	struct dentry *dentry;
	287	int status;
	288
	289	dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
	290
1b1dcc1b	291	mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
c7b9a459	292	dentry = lookup_one_len(name, rec_dir.dentry, namlen);
1b1dcc1b	293	mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
c7b9a459 N	294	if (IS_ERR(dentry)) {
	295	status = PTR_ERR(dentry);
	296	return status;
	297	}
	298	status = -ENOENT;
	299	if (!dentry->d_inode)
	300	goto out;
	301
	302	status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
	303	out:
	304	dput(dentry);
	305	return status;
	306	}
	307
	308	void
	309	nfsd4_remove_clid_dir(struct nfs4_client *clp)
	310	{
	311	uid_t uid;
	312	gid_t gid;
	313	int status;
	314
	315	if (!rec_dir_init \|\| !clp->cl_firststate)
	316	return;
	317
67be4313	318	clp->cl_firststate = 0;
c7b9a459 N	319	nfs4_save_user(&uid, &gid);
	320	status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
	321	nfs4_reset_user(uid, gid);
	322	if (status == 0)
a6ccbbb8	323	nfsd4_sync_rec_dir();
c7b9a459 N	324	if (status)
	325	printk("NFSD: Failed to remove expired client state directory"
	326	" %.*s\n", HEXDIR_LEN, clp->cl_recdir);
	327	return;
	328	}
	329
	330	static int
	331	purge_old(struct dentry parent, struct dentry child)
	332	{
	333	int status;
	334
	335	if (nfs4_has_reclaimed_state(child->d_name.name))
b37ad28b	336	return 0;
c7b9a459 N	337
	338	status = nfsd4_clear_clid_dir(parent, child);
	339	if (status)
	340	printk("failed to remove client recovery directory %s\n",
	341	child->d_name.name);
	342	/* Keep trying, success or failure: */
b37ad28b	343	return 0;
c7b9a459 N	344	}
	345
	346	void
	347	nfsd4_recdir_purge_old(void) {
	348	int status;
	349
	350	if (!rec_dir_init)
	351	return;
	352	status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
	353	if (status == 0)
a6ccbbb8	354	nfsd4_sync_rec_dir();
c7b9a459 N	355	if (status)
	356	printk("nfsd4: failed to purge old clients from recovery"
	357	" directory %s\n", rec_dir.dentry->d_name.name);
	358	return;
	359	}
	360
190e4fbf N	361	static int
	362	load_recdir(struct dentry parent, struct dentry child)
	363	{
	364	if (child->d_name.len != HEXDIR_LEN - 1) {
	365	printk("nfsd4: illegal name %s in recovery directory\n",
	366	child->d_name.name);
	367	/* Keep trying; maybe the others are OK: */
b37ad28b	368	return 0;
190e4fbf N	369	}
190e4fbf N	370	nfs4_client_to_reclaim(child->d_name.name);
b37ad28b	371	return 0;
190e4fbf N	372	}
	373
	374	int
	375	nfsd4_recdir_load(void) {
	376	int status;
	377
	378	status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
	379	if (status)
	380	printk("nfsd4: failed loading clients from recovery"
	381	" directory %s\n", rec_dir.dentry->d_name.name);
	382	return status;
	383	}
	384
	385	/*
	386	* Hold reference to the recovery directory.
	387	*/
	388
	389	void
	390	nfsd4_init_recdir(char *rec_dirname)
	391	{
	392	uid_t uid = 0;
	393	gid_t gid = 0;
	394	int status;
	395
	396	printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
	397	rec_dirname);
	398
	399	BUG_ON(rec_dir_init);
	400
	401	nfs4_save_user(&uid, &gid);
	402
c2642ab0 BF	403	status = path_lookup(rec_dirname, LOOKUP_FOLLOW \| LOOKUP_DIRECTORY,
	404	&rec_dir);
	405	if (status)
	406	printk("NFSD: unable to find recovery directory %s\n",
190e4fbf N	407	rec_dirname);
	408
	409	if (!status)
	410	rec_dir_init = 1;
	411	nfs4_reset_user(uid, gid);
	412	}
	413
	414	void
	415	nfsd4_shutdown_recdir(void)
	416	{
	417	if (!rec_dir_init)
	418	return;
	419	rec_dir_init = 0;
	420	path_release(&rec_dir);
	421	}