[GitHub/mt8127/android_kernel_alcatel_ttab.git] / 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/file.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/crypto.h>
#include <linux/sched.h>

#include "nfsd.h"
#include "state.h"
#include "vfs.h"

#define NFSDDBG_FACILITY                NFSDDBG_PROC

/* Globals */
static struct file *rec_file;
static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";

static int
nfs4_save_creds(const struct cred **original_creds)
{
	struct cred *new;

	new = prepare_creds();
	if (!new)
		return -ENOMEM;

	new->fsuid = 0;
	new->fsgid = 0;
	*original_creds = override_creds(new);
	put_cred(new);
	return 0;
}

static void
nfs4_reset_creds(const struct cred *original)
{
	revert_creds(original);
}

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;
	__be32 status = nfserr_jukebox;

	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_init_one(&sg, clname->data, clname->len);

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

	md5_to_hex(dname, cksum.data);

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

int
nfsd4_create_clid_dir(struct nfs4_client *clp)
{
	const struct cred *original_cred;
	char *dname = clp->cl_recdir;
	struct dentry *dir, *dentry;
	int status;

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

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

	clp->cl_firststate = 1;
	status = nfs4_save_creds(&original_cred);
	if (status < 0)
		return status;

	dir = rec_file->f_path.dentry;
	/* lock the parent */
	mutex_lock(&dir->d_inode->i_mutex);

	dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
	if (IS_ERR(dentry)) {
		status = PTR_ERR(dentry);
		goto out_unlock;
	}
	if (dentry->d_inode)
		/*
		 * In the 4.1 case, where we're called from
		 * reclaim_complete(), records from the previous reboot
		 * may still be left, so this is OK.
		 *
		 * In the 4.0 case, we should never get here; but we may
		 * as well be forgiving and just succeed silently.
		 */
		goto out_put;
	status = mnt_want_write(rec_file->f_path.mnt);
	if (status)
		goto out_put;
	status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
	mnt_drop_write(rec_file->f_path.mnt);
out_put:
	dput(dentry);
out_unlock:
	mutex_unlock(&dir->d_inode->i_mutex);
	if (status == 0)
		vfs_fsync(rec_file, 0);
	else
		printk(KERN_ERR "NFSD: failed to write recovery record"
				" (err %d); please check that %s exists"
				" and is writeable", status,
				user_recovery_dirname);
	nfs4_reset_creds(original_cred);
	return status;
}

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

struct name_list {
	char name[HEXDIR_LEN];
	struct list_head list;
};

static int
nfsd4_build_namelist(void *arg, const char *name, int namlen,
		loff_t offset, u64 ino, unsigned int d_type)
{
	struct list_head *names = arg;
	struct name_list *entry;

	if (namlen != HEXDIR_LEN - 1)
		return 0;
	entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
	if (entry == NULL)
		return -ENOMEM;
	memcpy(entry->name, name, HEXDIR_LEN - 1);
	entry->name[HEXDIR_LEN - 1] = '\0';
	list_add(&entry->list, names);
	return 0;
}

static int
nfsd4_list_rec_dir(recdir_func *f)
{
	const struct cred *original_cred;
	struct dentry *dir = rec_file->f_path.dentry;
	LIST_HEAD(names);
	int status;

	status = nfs4_save_creds(&original_cred);
	if (status < 0)
		return status;

	status = vfs_llseek(rec_file, 0, SEEK_SET);
	if (status < 0) {
		nfs4_reset_creds(original_cred);
		return status;
	}

	status = vfs_readdir(rec_file, nfsd4_build_namelist, &names);
	mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
	while (!list_empty(&names)) {
		struct name_list *entry;
		entry = list_entry(names.next, struct name_list, list);
		if (!status) {
			struct dentry *dentry;
			dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
			if (IS_ERR(dentry)) {
				status = PTR_ERR(dentry);
				break;
			}
			status = f(dir, dentry);
			dput(dentry);
		}
		list_del(&entry->list);
		kfree(entry);
	}
	mutex_unlock(&dir->d_inode->i_mutex);
	nfs4_reset_creds(original_cred);
	return status;
}

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

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

	dir = rec_file->f_path.dentry;
	mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
	dentry = lookup_one_len(name, dir, namlen);
	if (IS_ERR(dentry)) {
		status = PTR_ERR(dentry);
		goto out_unlock;
	}
	status = -ENOENT;
	if (!dentry->d_inode)
		goto out;
	status = vfs_rmdir(dir->d_inode, dentry);
out:
	dput(dentry);
out_unlock:
	mutex_unlock(&dir->d_inode->i_mutex);
	return status;
}

void
nfsd4_remove_clid_dir(struct nfs4_client *clp)
{
	const struct cred *original_cred;
	int status;

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

	status = mnt_want_write(rec_file->f_path.mnt);
	if (status)
		goto out;
	clp->cl_firststate = 0;

	status = nfs4_save_creds(&original_cred);
	if (status < 0)
		goto out;

	status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
	nfs4_reset_creds(original_cred);
	if (status == 0)
		vfs_fsync(rec_file, 0);
	mnt_drop_write(rec_file->f_path.mnt);
out:
	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, false))
		return 0;

	status = vfs_rmdir(parent->d_inode, 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_file)
		return;
	status = mnt_want_write(rec_file->f_path.mnt);
	if (status)
		goto out;
	status = nfsd4_list_rec_dir(purge_old);
	if (status == 0)
		vfs_fsync(rec_file, 0);
	mnt_drop_write(rec_file->f_path.mnt);
out:
	if (status)
		printk("nfsd4: failed to purge old clients from recovery"
			" directory %s\n", rec_file->f_path.dentry->d_name.name);
}

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;

	if (!rec_file)
		return 0;

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

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

void
nfsd4_init_recdir()
{
	const struct cred *original_cred;
	int status;

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

	BUG_ON(rec_file);

	status = nfs4_save_creds(&original_cred);
	if (status < 0) {
		printk("NFSD: Unable to change credentials to find recovery"
		       " directory: error %d\n",
		       status);
		return;
	}

	rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0);
	if (IS_ERR(rec_file)) {
		printk("NFSD: unable to find recovery directory %s\n",
				user_recovery_dirname);
		rec_file = NULL;
	}

	nfs4_reset_creds(original_cred);
}

void
nfsd4_shutdown_recdir(void)
{
	if (!rec_file)
		return;
	fput(rec_file);
	rec_file = NULL;
}

/*
 * Change the NFSv4 recovery directory to recdir.
 */
int
nfs4_reset_recoverydir(char *recdir)
{
	int status;
	struct path path;

	status = kern_path(recdir, LOOKUP_FOLLOW, &path);
	if (status)
		return status;
	status = -ENOTDIR;
	if (S_ISDIR(path.dentry->d_inode->i_mode)) {
		strcpy(user_recovery_dirname, recdir);
		status = 0;
	}
	path_put(&path);
	return status;
}

char *
nfs4_recoverydir(void)
{
	return user_recovery_dirname;
}
Commit	Line	Data
a55370a3	1	/*
a55370a3 N	2	* Copyright (c) 2004 The Regents of the University of Michigan.
	3	* All rights reserved.
	4	*
	5	* Andy Adamson <andros@citi.umich.edu>
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	*
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the name of the University nor the names of its
	17	* contributors may be used to endorse or promote products derived
	18	* from this software without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	21	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	22	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	23	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	25	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	26	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	27	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	28	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	29	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	30	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	31	*
	32	*/
	33
190e4fbf	34	#include <linux/file.h>
5a0e3ad6	35	#include <linux/slab.h>
190e4fbf	36	#include <linux/namei.h>
a55370a3	37	#include <linux/crypto.h>
e8edc6e0	38	#include <linux/sched.h>
9a74af21 BH	39
	40	#include "nfsd.h"
	41	#include "state.h"
0a3adade	42	#include "vfs.h"
a55370a3 N	43
	44	#define NFSDDBG_FACILITY NFSDDBG_PROC
	45
190e4fbf	46	/* Globals */
e970a573	47	static struct file *rec_file;
48483bf2	48	static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
190e4fbf	49
d84f4f99 DH	50	static int
d84f4f99 DH	51	nfs4_save_creds(const struct cred **original_creds)
190e4fbf	52	{
d84f4f99 DH	53	struct cred *new;
	54
	55	new = prepare_creds();
	56	if (!new)
	57	return -ENOMEM;
	58
	59	new->fsuid = 0;
	60	new->fsgid = 0;
	61	*original_creds = override_creds(new);
	62	put_cred(new);
	63	return 0;
190e4fbf N	64	}
	65
	66	static void
d84f4f99	67	nfs4_reset_creds(const struct cred *original)
190e4fbf	68	{
d84f4f99	69	revert_creds(original);
190e4fbf N	70	}
190e4fbf N	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;
60c74f81	91	struct scatterlist sg;
3e772463	92	__be32 status = nfserr_jukebox;
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	104
60c74f81	105	sg_init_one(&sg, clname->data, clname->len);
a55370a3	106
60c74f81	107	if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data))
35058687	108	goto out;
a55370a3 N	109
	110	md5_to_hex(dname, cksum.data);
	111
a55370a3 N	112	status = nfs_ok;
a55370a3 N	113	out:
2bd9e7b6	114	kfree(cksum.data);
35058687 HX	115	crypto_free_hash(desc.tfm);
35058687 HX	116	out_no_tfm:
a55370a3 N	117	return status;
a55370a3 N	118	}
190e4fbf	119
c7b9a459 N	120	int
	121	nfsd4_create_clid_dir(struct nfs4_client *clp)
	122	{
d84f4f99	123	const struct cred *original_cred;
c7b9a459	124	char *dname = clp->cl_recdir;
e970a573	125	struct dentry dir, dentry;
c7b9a459 N	126	int status;
	127
	128	dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
	129
e970a573	130	if (!rec_file \|\| clp->cl_firststate)
c7b9a459 N	131	return 0;
c7b9a459 N	132
6577aac0	133	clp->cl_firststate = 1;
d84f4f99 DH	134	status = nfs4_save_creds(&original_cred);
	135	if (status < 0)
	136	return status;
c7b9a459	137
e970a573	138	dir = rec_file->f_path.dentry;
c7b9a459	139	/* lock the parent */
e970a573	140	mutex_lock(&dir->d_inode->i_mutex);
c7b9a459	141
e970a573	142	dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1);
c7b9a459 N	143	if (IS_ERR(dentry)) {
	144	status = PTR_ERR(dentry);
	145	goto out_unlock;
	146	}
6577aac0	147	if (dentry->d_inode)
aec39680 BF	148	/*
	149	* In the 4.1 case, where we're called from
	150	* reclaim_complete(), records from the previous reboot
	151	* may still be left, so this is OK.
	152	*
	153	* In the 4.0 case, we should never get here; but we may
	154	* as well be forgiving and just succeed silently.
	155	*/
c7b9a459	156	goto out_put;
e970a573	157	status = mnt_want_write(rec_file->f_path.mnt);
463c3197 DH	158	if (status)
463c3197 DH	159	goto out_put;
e970a573 CH	160	status = vfs_mkdir(dir->d_inode, dentry, S_IRWXU);
e970a573 CH	161	mnt_drop_write(rec_file->f_path.mnt);
c7b9a459 N	162	out_put:
	163	dput(dentry);
	164	out_unlock:
e970a573	165	mutex_unlock(&dir->d_inode->i_mutex);
6577aac0	166	if (status == 0)
8018ab05	167	vfs_fsync(rec_file, 0);
6577aac0 BH	168	else
	169	printk(KERN_ERR "NFSD: failed to write recovery record"
	170	" (err %d); please check that %s exists"
	171	" and is writeable", status,
	172	user_recovery_dirname);
d84f4f99	173	nfs4_reset_creds(original_cred);
c7b9a459 N	174	return status;
	175	}
	176
190e4fbf N	177	typedef int (recdir_func)(struct dentry , struct dentry );
190e4fbf N	178
05f4f678 BF	179	struct name_list {
05f4f678 BF	180	char name[HEXDIR_LEN];
190e4fbf N	181	struct list_head list;
	182	};
	183
190e4fbf	184	static int
05f4f678	185	nfsd4_build_namelist(void arg, const char name, int namlen,
afefdbb2	186	loff_t offset, u64 ino, unsigned int d_type)
190e4fbf	187	{
05f4f678 BF	188	struct list_head *names = arg;
05f4f678 BF	189	struct name_list *entry;
190e4fbf	190
05f4f678	191	if (namlen != HEXDIR_LEN - 1)
b37ad28b	192	return 0;
05f4f678 BF	193	entry = kmalloc(sizeof(struct name_list), GFP_KERNEL);
05f4f678 BF	194	if (entry == NULL)
190e4fbf	195	return -ENOMEM;
05f4f678 BF	196	memcpy(entry->name, name, HEXDIR_LEN - 1);
	197	entry->name[HEXDIR_LEN - 1] = '\0';
	198	list_add(&entry->list, names);
190e4fbf N	199	return 0;
	200	}
	201
	202	static int
5b4b299c	203	nfsd4_list_rec_dir(recdir_func *f)
190e4fbf	204	{
d84f4f99	205	const struct cred *original_cred;
5b4b299c	206	struct dentry *dir = rec_file->f_path.dentry;
05f4f678	207	LIST_HEAD(names);
190e4fbf N	208	int status;
190e4fbf N	209
d84f4f99 DH	210	status = nfs4_save_creds(&original_cred);
	211	if (status < 0)
	212	return status;
190e4fbf	213
5b4b299c AV	214	status = vfs_llseek(rec_file, 0, SEEK_SET);
	215	if (status < 0) {
	216	nfs4_reset_creds(original_cred);
	217	return status;
	218	}
	219
	220	status = vfs_readdir(rec_file, nfsd4_build_namelist, &names);
8daed1e5	221	mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
05f4f678	222	while (!list_empty(&names)) {
5b4b299c	223	struct name_list *entry;
05f4f678	224	entry = list_entry(names.next, struct name_list, list);
5b4b299c AV	225	if (!status) {
	226	struct dentry *dentry;
	227	dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1);
	228	if (IS_ERR(dentry)) {
	229	status = PTR_ERR(dentry);
	230	break;
	231	}
	232	status = f(dir, dentry);
	233	dput(dentry);
05f4f678	234	}
05f4f678 BF	235	list_del(&entry->list);
05f4f678 BF	236	kfree(entry);
190e4fbf	237	}
2f9092e1	238	mutex_unlock(&dir->d_inode->i_mutex);
d84f4f99	239	nfs4_reset_creds(original_cred);
190e4fbf N	240	return status;
	241	}
	242
c7b9a459 N	243	static int
	244	nfsd4_unlink_clid_dir(char *name, int namlen)
	245	{
e970a573	246	struct dentry dir, dentry;
c7b9a459 N	247	int status;
	248
	249	dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
	250
e970a573 CH	251	dir = rec_file->f_path.dentry;
	252	mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
	253	dentry = lookup_one_len(name, dir, namlen);
c7b9a459 N	254	if (IS_ERR(dentry)) {
c7b9a459 N	255	status = PTR_ERR(dentry);
2f9092e1	256	goto out_unlock;
c7b9a459 N	257	}
	258	status = -ENOENT;
	259	if (!dentry->d_inode)
	260	goto out;
e970a573	261	status = vfs_rmdir(dir->d_inode, dentry);
c7b9a459 N	262	out:
c7b9a459 N	263	dput(dentry);
2f9092e1	264	out_unlock:
e970a573	265	mutex_unlock(&dir->d_inode->i_mutex);
c7b9a459 N	266	return status;
	267	}
	268
	269	void
	270	nfsd4_remove_clid_dir(struct nfs4_client *clp)
	271	{
d84f4f99	272	const struct cred *original_cred;
c7b9a459 N	273	int status;
c7b9a459 N	274
e970a573	275	if (!rec_file \|\| !clp->cl_firststate)
c7b9a459 N	276	return;
c7b9a459 N	277
e970a573	278	status = mnt_want_write(rec_file->f_path.mnt);
0622753b DH	279	if (status)
0622753b DH	280	goto out;
67be4313	281	clp->cl_firststate = 0;
d84f4f99 DH	282
	283	status = nfs4_save_creds(&original_cred);
	284	if (status < 0)
	285	goto out;
	286
c7b9a459	287	status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
d84f4f99	288	nfs4_reset_creds(original_cred);
c7b9a459	289	if (status == 0)
8018ab05	290	vfs_fsync(rec_file, 0);
e970a573	291	mnt_drop_write(rec_file->f_path.mnt);
0622753b	292	out:
c7b9a459 N	293	if (status)
	294	printk("NFSD: Failed to remove expired client state directory"
	295	" %.*s\n", HEXDIR_LEN, clp->cl_recdir);
	296	return;
	297	}
	298
	299	static int
	300	purge_old(struct dentry parent, struct dentry child)
	301	{
	302	int status;
	303
a1bcecd2	304	if (nfs4_has_reclaimed_state(child->d_name.name, false))
b37ad28b	305	return 0;
c7b9a459	306
2f9092e1	307	status = vfs_rmdir(parent->d_inode, child);
c7b9a459 N	308	if (status)
	309	printk("failed to remove client recovery directory %s\n",
	310	child->d_name.name);
	311	/* Keep trying, success or failure: */
b37ad28b	312	return 0;
c7b9a459 N	313	}
	314
	315	void
	316	nfsd4_recdir_purge_old(void) {
	317	int status;
	318
e970a573	319	if (!rec_file)
c7b9a459	320	return;
e970a573	321	status = mnt_want_write(rec_file->f_path.mnt);
0622753b DH	322	if (status)
0622753b DH	323	goto out;
5b4b299c	324	status = nfsd4_list_rec_dir(purge_old);
c7b9a459	325	if (status == 0)
8018ab05	326	vfs_fsync(rec_file, 0);
e970a573	327	mnt_drop_write(rec_file->f_path.mnt);
0622753b	328	out:
c7b9a459 N	329	if (status)
c7b9a459 N	330	printk("nfsd4: failed to purge old clients from recovery"
e970a573	331	" directory %s\n", rec_file->f_path.dentry->d_name.name);
c7b9a459 N	332	}
c7b9a459 N	333
190e4fbf N	334	static int
	335	load_recdir(struct dentry parent, struct dentry child)
	336	{
	337	if (child->d_name.len != HEXDIR_LEN - 1) {
	338	printk("nfsd4: illegal name %s in recovery directory\n",
	339	child->d_name.name);
	340	/* Keep trying; maybe the others are OK: */
b37ad28b	341	return 0;
190e4fbf N	342	}
190e4fbf N	343	nfs4_client_to_reclaim(child->d_name.name);
b37ad28b	344	return 0;
190e4fbf N	345	}
	346
	347	int
	348	nfsd4_recdir_load(void) {
	349	int status;
	350
e970a573 CH	351	if (!rec_file)
	352	return 0;
	353
5b4b299c	354	status = nfsd4_list_rec_dir(load_recdir);
190e4fbf N	355	if (status)
190e4fbf N	356	printk("nfsd4: failed loading clients from recovery"
e970a573	357	" directory %s\n", rec_file->f_path.dentry->d_name.name);
190e4fbf N	358	return status;
	359	}
	360
	361	/*
	362	* Hold reference to the recovery directory.
	363	*/
	364
	365	void
48483bf2	366	nfsd4_init_recdir()
190e4fbf	367	{
d84f4f99 DH	368	const struct cred *original_cred;
d84f4f99 DH	369	int status;
190e4fbf N	370
190e4fbf N	371	printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
48483bf2	372	user_recovery_dirname);
190e4fbf	373
e970a573	374	BUG_ON(rec_file);
190e4fbf	375
d84f4f99 DH	376	status = nfs4_save_creds(&original_cred);
	377	if (status < 0) {
	378	printk("NFSD: Unable to change credentials to find recovery"
	379	" directory: error %d\n",
	380	status);
	381	return;
	382	}
190e4fbf	383
48483bf2	384	rec_file = filp_open(user_recovery_dirname, O_RDONLY \| O_DIRECTORY, 0);
e970a573	385	if (IS_ERR(rec_file)) {
c2642ab0	386	printk("NFSD: unable to find recovery directory %s\n",
48483bf2	387	user_recovery_dirname);
e970a573 CH	388	rec_file = NULL;
e970a573 CH	389	}
190e4fbf	390
d84f4f99	391	nfs4_reset_creds(original_cred);
190e4fbf N	392	}
	393
	394	void
	395	nfsd4_shutdown_recdir(void)
	396	{
e970a573	397	if (!rec_file)
190e4fbf	398	return;
e970a573 CH	399	fput(rec_file);
e970a573 CH	400	rec_file = NULL;
190e4fbf	401	}
48483bf2 BF	402
	403	/*
	404	* Change the NFSv4 recovery directory to recdir.
	405	*/
	406	int
	407	nfs4_reset_recoverydir(char *recdir)
	408	{
	409	int status;
	410	struct path path;
	411
	412	status = kern_path(recdir, LOOKUP_FOLLOW, &path);
	413	if (status)
	414	return status;
	415	status = -ENOTDIR;
	416	if (S_ISDIR(path.dentry->d_inode->i_mode)) {
	417	strcpy(user_recovery_dirname, recdir);
	418	status = 0;
	419	}
	420	path_put(&path);
	421	return status;
	422	}
	423
	424	char *
	425	nfs4_recoverydir(void)
	426	{
	427	return user_recovery_dirname;
	428	}