[mirror_ubuntu-bionic-kernel.git] / fs / lockd / svcsubs.c

/*
 * linux/fs/lockd/svcsubs.c
 *
 * Various support routines for the NLM server.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/addr.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <uapi/linux/nfs2.h>

#define NLMDBG_FACILITY		NLMDBG_SVCSUBS


/*
 * Global file hash table
 */
#define FILE_HASH_BITS		7
#define FILE_NRHASH		(1<<FILE_HASH_BITS)
static struct hlist_head	nlm_files[FILE_NRHASH];
static DEFINE_MUTEX(nlm_file_mutex);

#ifdef CONFIG_SUNRPC_DEBUG
static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
{
	u32 *fhp = (u32*)f->data;

	/* print the first 32 bytes of the fh */
	dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
		msg, fhp[0], fhp[1], fhp[2], fhp[3],
		fhp[4], fhp[5], fhp[6], fhp[7]);
}

static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
{
	struct inode *inode = file_inode(file->f_file);

	dprintk("lockd: %s %s/%ld\n",
		msg, inode->i_sb->s_id, inode->i_ino);
}
#else
static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
{
	return;
}

static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
{
	return;
}
#endif

static inline unsigned int file_hash(struct nfs_fh *f)
{
	unsigned int tmp=0;
	int i;
	for (i=0; i<NFS2_FHSIZE;i++)
		tmp += f->data[i];
	return tmp & (FILE_NRHASH - 1);
}

/*
 * Lookup file info. If it doesn't exist, create a file info struct
 * and open a (VFS) file for the given inode.
 *
 * FIXME:
 * Note that we open the file O_RDONLY even when creating write locks.
 * This is not quite right, but for now, we assume the client performs
 * the proper R/W checking.
 */
__be32
nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
					struct nfs_fh *f)
{
	struct nlm_file	*file;
	unsigned int	hash;
	__be32		nfserr;

	nlm_debug_print_fh("nlm_lookup_file", f);

	hash = file_hash(f);

	/* Lock file table */
	mutex_lock(&nlm_file_mutex);

	hlist_for_each_entry(file, &nlm_files[hash], f_list)
		if (!nfs_compare_fh(&file->f_handle, f))
			goto found;

	nlm_debug_print_fh("creating file for", f);

	nfserr = nlm_lck_denied_nolocks;
	file = kzalloc(sizeof(*file), GFP_KERNEL);
	if (!file)
		goto out_unlock;

	memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
	mutex_init(&file->f_mutex);
	INIT_HLIST_NODE(&file->f_list);
	INIT_LIST_HEAD(&file->f_blocks);

	/* Open the file. Note that this must not sleep for too long, else
	 * we would lock up lockd:-) So no NFS re-exports, folks.
	 *
	 * We have to make sure we have the right credential to open
	 * the file.
	 */
	if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
		dprintk("lockd: open failed (error %d)\n", nfserr);
		goto out_free;
	}

	hlist_add_head(&file->f_list, &nlm_files[hash]);

found:
	dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
	*result = file;
	file->f_count++;
	nfserr = 0;

out_unlock:
	mutex_unlock(&nlm_file_mutex);
	return nfserr;

out_free:
	kfree(file);
	goto out_unlock;
}

/*
 * Delete a file after having released all locks, blocks and shares
 */
static inline void
nlm_delete_file(struct nlm_file *file)
{
	nlm_debug_print_file("closing file", file);
	if (!hlist_unhashed(&file->f_list)) {
		hlist_del(&file->f_list);
		nlmsvc_ops->fclose(file->f_file);
		kfree(file);
	} else {
		printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
	}
}

/*
 * Loop over all locks on the given file and perform the specified
 * action.
 */
static int
nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
			nlm_host_match_fn_t match)
{
	struct inode	 *inode = nlmsvc_file_inode(file);
	struct file_lock *fl;
	struct file_lock_context *flctx = inode->i_flctx;
	struct nlm_host	 *lockhost;

	if (!flctx || list_empty_careful(&flctx->flc_posix))
		return 0;
again:
	file->f_locks = 0;
	spin_lock(&flctx->flc_lock);
	list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
		if (fl->fl_lmops != &nlmsvc_lock_operations)
			continue;

		/* update current lock count */
		file->f_locks++;

		lockhost = (struct nlm_host *) fl->fl_owner;
		if (match(lockhost, host)) {
			struct file_lock lock = *fl;

			spin_unlock(&flctx->flc_lock);
			lock.fl_type  = F_UNLCK;
			lock.fl_start = 0;
			lock.fl_end   = OFFSET_MAX;
			if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
				printk("lockd: unlock failure in %s:%d\n",
						__FILE__, __LINE__);
				return 1;
			}
			goto again;
		}
	}
	spin_unlock(&flctx->flc_lock);

	return 0;
}

static int
nlmsvc_always_match(void *dummy1, struct nlm_host *dummy2)
{
	return 1;
}

/*
 * Inspect a single file
 */
static inline int
nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
{
	nlmsvc_traverse_blocks(host, file, match);
	nlmsvc_traverse_shares(host, file, match);
	return nlm_traverse_locks(host, file, match);
}

/*
 * Quick check whether there are still any locks, blocks or
 * shares on a given file.
 */
static inline int
nlm_file_inuse(struct nlm_file *file)
{
	struct inode	 *inode = nlmsvc_file_inode(file);
	struct file_lock *fl;
	struct file_lock_context *flctx = inode->i_flctx;

	if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
		return 1;

	if (flctx && !list_empty_careful(&flctx->flc_posix)) {
		spin_lock(&flctx->flc_lock);
		list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
			if (fl->fl_lmops == &nlmsvc_lock_operations) {
				spin_unlock(&flctx->flc_lock);
				return 1;
			}
		}
		spin_unlock(&flctx->flc_lock);
	}
	file->f_locks = 0;
	return 0;
}

/*
 * Loop over all files in the file table.
 */
static int
nlm_traverse_files(void *data, nlm_host_match_fn_t match,
		int (*is_failover_file)(void *data, struct nlm_file *file))
{
	struct hlist_node *next;
	struct nlm_file	*file;
	int i, ret = 0;

	mutex_lock(&nlm_file_mutex);
	for (i = 0; i < FILE_NRHASH; i++) {
		hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
			if (is_failover_file && !is_failover_file(data, file))
				continue;
			file->f_count++;
			mutex_unlock(&nlm_file_mutex);

			/* Traverse locks, blocks and shares of this file
			 * and update file->f_locks count */
			if (nlm_inspect_file(data, file, match))
				ret = 1;

			mutex_lock(&nlm_file_mutex);
			file->f_count--;
			/* No more references to this file. Let go of it. */
			if (list_empty(&file->f_blocks) && !file->f_locks
			 && !file->f_shares && !file->f_count) {
				hlist_del(&file->f_list);
				nlmsvc_ops->fclose(file->f_file);
				kfree(file);
			}
		}
	}
	mutex_unlock(&nlm_file_mutex);
	return ret;
}

/*
 * Release file. If there are no more remote locks on this file,
 * close it and free the handle.
 *
 * Note that we can't do proper reference counting without major
 * contortions because the code in fs/locks.c creates, deletes and
 * splits locks without notification. Our only way is to walk the
 * entire lock list each time we remove a lock.
 */
void
nlm_release_file(struct nlm_file *file)
{
	dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
				file, file->f_count);

	/* Lock file table */
	mutex_lock(&nlm_file_mutex);

	/* If there are no more locks etc, delete the file */
	if (--file->f_count == 0 && !nlm_file_inuse(file))
		nlm_delete_file(file);

	mutex_unlock(&nlm_file_mutex);
}

/*
 * Helpers function for resource traversal
 *
 * nlmsvc_mark_host:
 *	used by the garbage collector; simply sets h_inuse only for those
 *	hosts, which passed network check.
 *	Always returns 0.
 *
 * nlmsvc_same_host:
 *	returns 1 iff the two hosts match. Used to release
 *	all resources bound to a specific host.
 *
 * nlmsvc_is_client:
 *	returns 1 iff the host is a client.
 *	Used by nlmsvc_invalidate_all
 */

static int
nlmsvc_mark_host(void *data, struct nlm_host *hint)
{
	struct nlm_host *host = data;

	if ((hint->net == NULL) ||
	    (host->net == hint->net))
		host->h_inuse = 1;
	return 0;
}

static int
nlmsvc_same_host(void *data, struct nlm_host *other)
{
	struct nlm_host *host = data;

	return host == other;
}

static int
nlmsvc_is_client(void *data, struct nlm_host *dummy)
{
	struct nlm_host *host = data;

	if (host->h_server) {
		/* we are destroying locks even though the client
		 * hasn't asked us too, so don't unmonitor the
		 * client
		 */
		if (host->h_nsmhandle)
			host->h_nsmhandle->sm_sticky = 1;
		return 1;
	} else
		return 0;
}

/*
 * Mark all hosts that still hold resources
 */
void
nlmsvc_mark_resources(struct net *net)
{
	struct nlm_host hint;

	dprintk("lockd: %s for net %x\n", __func__, net ? net->ns.inum : 0);
	hint.net = net;
	nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
}

/*
 * Release all resources held by the given client
 */
void
nlmsvc_free_host_resources(struct nlm_host *host)
{
	dprintk("lockd: nlmsvc_free_host_resources\n");

	if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
		printk(KERN_WARNING
			"lockd: couldn't remove all locks held by %s\n",
			host->h_name);
		BUG();
	}
}

/**
 * nlmsvc_invalidate_all - remove all locks held for clients
 *
 * Release all locks held by NFS clients.
 *
 */
void
nlmsvc_invalidate_all(void)
{
	/*
	 * Previously, the code would call
	 * nlmsvc_free_host_resources for each client in
	 * turn, which is about as inefficient as it gets.
	 * Now we just do it once in nlm_traverse_files.
	 */
	nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
}

static int
nlmsvc_match_sb(void *datap, struct nlm_file *file)
{
	struct super_block *sb = datap;

	return sb == file_inode(file->f_file)->i_sb;
}

/**
 * nlmsvc_unlock_all_by_sb - release locks held on this file system
 * @sb: super block
 *
 * Release all locks held by clients accessing this file system.
 */
int
nlmsvc_unlock_all_by_sb(struct super_block *sb)
{
	int ret;

	ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
	return ret ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);

static int
nlmsvc_match_ip(void *datap, struct nlm_host *host)
{
	return rpc_cmp_addr(nlm_srcaddr(host), datap);
}

/**
 * nlmsvc_unlock_all_by_ip - release local locks by IP address
 * @server_addr: server's IP address as seen by clients
 *
 * Release all locks held by clients accessing this host
 * via the passed in IP address.
 */
int
nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
{
	int ret;

	ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
	return ret ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svcsubs.c
	3	*
	4	* Various support routines for the NLM server.
	5	*
	6	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
1da177e4 LT	9	#include <linux/types.h>
	10	#include <linux/string.h>
	11	#include <linux/time.h>
	12	#include <linux/in.h>
5a0e3ad6	13	#include <linux/slab.h>
353ab6e9	14	#include <linux/mutex.h>
1da177e4	15	#include <linux/sunrpc/svc.h>
5976687a	16	#include <linux/sunrpc/addr.h>
1da177e4 LT	17	#include <linux/lockd/lockd.h>
1da177e4 LT	18	#include <linux/lockd/share.h>
4373ea84 WC	19	#include <linux/module.h>
4373ea84 WC	20	#include <linux/mount.h>
9c69de4c	21	#include <uapi/linux/nfs2.h>
1da177e4 LT	22
	23	#define NLMDBG_FACILITY NLMDBG_SVCSUBS
	24
	25
	26	/*
	27	* Global file hash table
	28	*/
07ba8063	29	#define FILE_HASH_BITS 7
1da177e4	30	#define FILE_NRHASH (1<<FILE_HASH_BITS)
07ba8063	31	static struct hlist_head nlm_files[FILE_NRHASH];
353ab6e9	32	static DEFINE_MUTEX(nlm_file_mutex);
1da177e4	33
135dd002	34	#ifdef CONFIG_SUNRPC_DEBUG
0bbacc40 CL	35	static inline void nlm_debug_print_fh(char msg, struct nfs_fh f)
	36	{
	37	u32 fhp = (u32)f->data;
	38
	39	/* print the first 32 bytes of the fh */
	40	dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
	41	msg, fhp[0], fhp[1], fhp[2], fhp[3],
	42	fhp[4], fhp[5], fhp[6], fhp[7]);
	43	}
	44
	45	static inline void nlm_debug_print_file(char msg, struct nlm_file file)
	46	{
496ad9aa	47	struct inode *inode = file_inode(file->f_file);
0bbacc40 CL	48
	49	dprintk("lockd: %s %s/%ld\n",
	50	msg, inode->i_sb->s_id, inode->i_ino);
	51	}
	52	#else
	53	static inline void nlm_debug_print_fh(char msg, struct nfs_fh f)
	54	{
	55	return;
	56	}
	57
	58	static inline void nlm_debug_print_file(char msg, struct nlm_file file)
	59	{
	60	return;
	61	}
	62	#endif
	63
1da177e4 LT	64	static inline unsigned int file_hash(struct nfs_fh *f)
	65	{
	66	unsigned int tmp=0;
	67	int i;
	68	for (i=0; i<NFS2_FHSIZE;i++)
	69	tmp += f->data[i];
	70	return tmp & (FILE_NRHASH - 1);
	71	}
	72
	73	/*
	74	* Lookup file info. If it doesn't exist, create a file info struct
	75	* and open a (VFS) file for the given inode.
	76	*
	77	* FIXME:
	78	* Note that we open the file O_RDONLY even when creating write locks.
	79	* This is not quite right, but for now, we assume the client performs
	80	* the proper R/W checking.
	81	*/
52921e02	82	__be32
1da177e4 LT	83	nlm_lookup_file(struct svc_rqst rqstp, struct nlm_file *result,
	84	struct nfs_fh *f)
	85	{
	86	struct nlm_file *file;
	87	unsigned int hash;
52921e02	88	__be32 nfserr;
1da177e4	89
50431d94	90	nlm_debug_print_fh("nlm_lookup_file", f);
1da177e4 LT	91
	92	hash = file_hash(f);
	93
	94	/* Lock file table */
353ab6e9	95	mutex_lock(&nlm_file_mutex);
1da177e4	96
b67bfe0d	97	hlist_for_each_entry(file, &nlm_files[hash], f_list)
1da177e4 LT	98	if (!nfs_compare_fh(&file->f_handle, f))
	99	goto found;
	100
0bbacc40	101	nlm_debug_print_fh("creating file for", f);
1da177e4 LT	102
1da177e4 LT	103	nfserr = nlm_lck_denied_nolocks;
f8314dc6	104	file = kzalloc(sizeof(*file), GFP_KERNEL);
1da177e4 LT	105	if (!file)
	106	goto out_unlock;
	107
1da177e4	108	memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
89e63ef6	109	mutex_init(&file->f_mutex);
07ba8063	110	INIT_HLIST_NODE(&file->f_list);
68a2d76c	111	INIT_LIST_HEAD(&file->f_blocks);
1da177e4 LT	112
	113	/* Open the file. Note that this must not sleep for too long, else
	114	* we would lock up lockd:-) So no NFS re-exports, folks.
	115	*
	116	* We have to make sure we have the right credential to open
	117	* the file.
	118	*/
	119	if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
f0737a39	120	dprintk("lockd: open failed (error %d)\n", nfserr);
1da177e4 LT	121	goto out_free;
	122	}
	123
07ba8063	124	hlist_add_head(&file->f_list, &nlm_files[hash]);
1da177e4 LT	125
	126	found:
	127	dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
	128	*result = file;
	129	file->f_count++;
	130	nfserr = 0;
	131
	132	out_unlock:
353ab6e9	133	mutex_unlock(&nlm_file_mutex);
1da177e4 LT	134	return nfserr;
	135
	136	out_free:
	137	kfree(file);
1da177e4 LT	138	goto out_unlock;
	139	}
	140
	141	/*
	142	* Delete a file after having released all locks, blocks and shares
	143	*/
	144	static inline void
	145	nlm_delete_file(struct nlm_file *file)
	146	{
0bbacc40	147	nlm_debug_print_file("closing file", file);
07ba8063 OK	148	if (!hlist_unhashed(&file->f_list)) {
	149	hlist_del(&file->f_list);
	150	nlmsvc_ops->fclose(file->f_file);
	151	kfree(file);
	152	} else {
	153	printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
1da177e4	154	}
1da177e4 LT	155	}
	156
	157	/*
	158	* Loop over all locks on the given file and perform the specified
	159	* action.
	160	*/
	161	static int
f2af793d OK	162	nlm_traverse_locks(struct nlm_host host, struct nlm_file file,
f2af793d OK	163	nlm_host_match_fn_t match)
1da177e4 LT	164	{
	165	struct inode *inode = nlmsvc_file_inode(file);
	166	struct file_lock *fl;
bd61e0a9	167	struct file_lock_context *flctx = inode->i_flctx;
1da177e4 LT	168	struct nlm_host *lockhost;
1da177e4 LT	169
bd61e0a9 JL	170	if (!flctx \|\| list_empty_careful(&flctx->flc_posix))
bd61e0a9 JL	171	return 0;
1da177e4 LT	172	again:
1da177e4 LT	173	file->f_locks = 0;
6109c850	174	spin_lock(&flctx->flc_lock);
bd61e0a9	175	list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
7117bf3d	176	if (fl->fl_lmops != &nlmsvc_lock_operations)
1da177e4 LT	177	continue;
	178
	179	/* update current lock count */
	180	file->f_locks++;
f2af793d	181
1da177e4	182	lockhost = (struct nlm_host *) fl->fl_owner;
f2af793d	183	if (match(lockhost, host)) {
1da177e4 LT	184	struct file_lock lock = *fl;
1da177e4 LT	185
6109c850	186	spin_unlock(&flctx->flc_lock);
1da177e4 LT	187	lock.fl_type = F_UNLCK;
	188	lock.fl_start = 0;
	189	lock.fl_end = OFFSET_MAX;
1a8322b2	190	if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {
1da177e4 LT	191	printk("lockd: unlock failure in %s:%d\n",
	192	__FILE__, __LINE__);
	193	return 1;
	194	}
	195	goto again;
	196	}
	197	}
6109c850	198	spin_unlock(&flctx->flc_lock);
1da177e4 LT	199
	200	return 0;
	201	}
	202
17efa372 WC	203	static int
	204	nlmsvc_always_match(void dummy1, struct nlm_host dummy2)
	205	{
	206	return 1;
	207	}
	208
1da177e4	209	/*
f2af793d OK	210	* Inspect a single file
	211	*/
	212	static inline int
	213	nlm_inspect_file(struct nlm_host host, struct nlm_file file, nlm_host_match_fn_t match)
	214	{
	215	nlmsvc_traverse_blocks(host, file, match);
	216	nlmsvc_traverse_shares(host, file, match);
	217	return nlm_traverse_locks(host, file, match);
	218	}
	219
	220	/*
	221	* Quick check whether there are still any locks, blocks or
	222	* shares on a given file.
1da177e4 LT	223	*/
1da177e4 LT	224	static inline int
f2af793d	225	nlm_file_inuse(struct nlm_file *file)
1da177e4	226	{
f2af793d OK	227	struct inode *inode = nlmsvc_file_inode(file);
f2af793d OK	228	struct file_lock *fl;
bd61e0a9	229	struct file_lock_context *flctx = inode->i_flctx;
f2af793d OK	230
	231	if (file->f_count \|\| !list_empty(&file->f_blocks) \|\| file->f_shares)
	232	return 1;
	233
bd61e0a9	234	if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6109c850	235	spin_lock(&flctx->flc_lock);
bd61e0a9 JL	236	list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
bd61e0a9 JL	237	if (fl->fl_lmops == &nlmsvc_lock_operations) {
6109c850	238	spin_unlock(&flctx->flc_lock);
bd61e0a9 JL	239	return 1;
bd61e0a9 JL	240	}
763641d8	241	}
6109c850	242	spin_unlock(&flctx->flc_lock);
1da177e4	243	}
f2af793d OK	244	file->f_locks = 0;
f2af793d OK	245	return 0;
1da177e4 LT	246	}
	247
	248	/*
	249	* Loop over all files in the file table.
	250	*/
	251	static int
17efa372 WC	252	nlm_traverse_files(void *data, nlm_host_match_fn_t match,
17efa372 WC	253	int (is_failover_file)(void data, struct nlm_file *file))
1da177e4	254	{
b67bfe0d	255	struct hlist_node *next;
07ba8063	256	struct nlm_file *file;
01df9c5e	257	int i, ret = 0;
1da177e4	258
353ab6e9	259	mutex_lock(&nlm_file_mutex);
1da177e4	260	for (i = 0; i < FILE_NRHASH; i++) {
b67bfe0d	261	hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
17efa372 WC	262	if (is_failover_file && !is_failover_file(data, file))
17efa372 WC	263	continue;
01df9c5e TM	264	file->f_count++;
	265	mutex_unlock(&nlm_file_mutex);
	266
1da177e4 LT	267	/* Traverse locks, blocks and shares of this file
1da177e4 LT	268	* and update file->f_locks count */
4373ea84	269	if (nlm_inspect_file(data, file, match))
01df9c5e	270	ret = 1;
1da177e4	271
01df9c5e TM	272	mutex_lock(&nlm_file_mutex);
01df9c5e TM	273	file->f_count--;
1da177e4	274	/* No more references to this file. Let go of it. */
68a2d76c	275	if (list_empty(&file->f_blocks) && !file->f_locks
1da177e4	276	&& !file->f_shares && !file->f_count) {
07ba8063	277	hlist_del(&file->f_list);
1da177e4 LT	278	nlmsvc_ops->fclose(file->f_file);
1da177e4 LT	279	kfree(file);
1da177e4 LT	280	}
	281	}
	282	}
353ab6e9	283	mutex_unlock(&nlm_file_mutex);
01df9c5e	284	return ret;
1da177e4 LT	285	}
	286
	287	/*
	288	* Release file. If there are no more remote locks on this file,
	289	* close it and free the handle.
	290	*
	291	* Note that we can't do proper reference counting without major
	292	* contortions because the code in fs/locks.c creates, deletes and
	293	* splits locks without notification. Our only way is to walk the
	294	* entire lock list each time we remove a lock.
	295	*/
	296	void
	297	nlm_release_file(struct nlm_file *file)
	298	{
	299	dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
	300	file, file->f_count);
	301
	302	/* Lock file table */
353ab6e9	303	mutex_lock(&nlm_file_mutex);
1da177e4 LT	304
1da177e4 LT	305	/* If there are no more locks etc, delete the file */
f2af793d OK	306	if (--file->f_count == 0 && !nlm_file_inuse(file))
f2af793d OK	307	nlm_delete_file(file);
1da177e4	308
353ab6e9	309	mutex_unlock(&nlm_file_mutex);
1da177e4 LT	310	}
1da177e4 LT	311
f2af793d OK	312	/*
	313	* Helpers function for resource traversal
	314	*
	315	* nlmsvc_mark_host:
b26411f8 SK	316	* used by the garbage collector; simply sets h_inuse only for those
b26411f8 SK	317	* hosts, which passed network check.
f2af793d OK	318	* Always returns 0.
	319	*
	320	* nlmsvc_same_host:
	321	* returns 1 iff the two hosts match. Used to release
	322	* all resources bound to a specific host.
	323	*
	324	* nlmsvc_is_client:
	325	* returns 1 iff the host is a client.
	326	* Used by nlmsvc_invalidate_all
	327	*/
b26411f8	328
f2af793d	329	static int
b26411f8	330	nlmsvc_mark_host(void data, struct nlm_host hint)
f2af793d	331	{
4373ea84 WC	332	struct nlm_host *host = data;
4373ea84 WC	333
b26411f8 SK	334	if ((hint->net == NULL) \|\|
	335	(host->net == hint->net))
	336	host->h_inuse = 1;
f2af793d OK	337	return 0;
	338	}
	339
	340	static int
4373ea84	341	nlmsvc_same_host(void data, struct nlm_host other)
f2af793d	342	{
4373ea84 WC	343	struct nlm_host *host = data;
4373ea84 WC	344
f2af793d OK	345	return host == other;
	346	}
	347
	348	static int
4373ea84	349	nlmsvc_is_client(void data, struct nlm_host dummy)
f2af793d	350	{
4373ea84 WC	351	struct nlm_host *host = data;
4373ea84 WC	352
4481d103 N	353	if (host->h_server) {
	354	/* we are destroying locks even though the client
	355	* hasn't asked us too, so don't unmonitor the
	356	* client
	357	*/
	358	if (host->h_nsmhandle)
	359	host->h_nsmhandle->sm_sticky = 1;
	360	return 1;
	361	} else
	362	return 0;
f2af793d OK	363	}
f2af793d OK	364
1da177e4 LT	365	/*
	366	* Mark all hosts that still hold resources
	367	*/
	368	void
b26411f8	369	nlmsvc_mark_resources(struct net *net)
1da177e4	370	{
b26411f8 SK	371	struct nlm_host hint;
b26411f8 SK	372
e919b076	373	dprintk("lockd: %s for net %x\n", __func__, net ? net->ns.inum : 0);
b26411f8 SK	374	hint.net = net;
b26411f8 SK	375	nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
1da177e4 LT	376	}
	377
	378	/*
	379	* Release all resources held by the given client
	380	*/
	381	void
	382	nlmsvc_free_host_resources(struct nlm_host *host)
	383	{
	384	dprintk("lockd: nlmsvc_free_host_resources\n");
	385
17efa372	386	if (nlm_traverse_files(host, nlmsvc_same_host, NULL)) {
1da177e4	387	printk(KERN_WARNING
f0737a39	388	"lockd: couldn't remove all locks held by %s\n",
1da177e4	389	host->h_name);
f0737a39 OK	390	BUG();
f0737a39 OK	391	}
1da177e4 LT	392	}
1da177e4 LT	393
367c8c7b CL	394	/**
	395	* nlmsvc_invalidate_all - remove all locks held for clients
	396	*
	397	* Release all locks held by NFS clients.
	398	*
1da177e4 LT	399	*/
	400	void
	401	nlmsvc_invalidate_all(void)
	402	{
367c8c7b	403	/*
f2af793d OK	404	* Previously, the code would call
	405	* nlmsvc_free_host_resources for each client in
	406	* turn, which is about as inefficient as it gets.
	407	* Now we just do it once in nlm_traverse_files.
	408	*/
17efa372 WC	409	nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
	410	}
	411
	412	static int
	413	nlmsvc_match_sb(void datap, struct nlm_file file)
	414	{
	415	struct super_block *sb = datap;
	416
30e46aba	417	return sb == file_inode(file->f_file)->i_sb;
17efa372 WC	418	}
17efa372 WC	419
367c8c7b CL	420	/**
	421	* nlmsvc_unlock_all_by_sb - release locks held on this file system
	422	* @sb: super block
	423	*
	424	* Release all locks held by clients accessing this file system.
	425	*/
17efa372 WC	426	int
	427	nlmsvc_unlock_all_by_sb(struct super_block *sb)
	428	{
	429	int ret;
	430
	431	ret = nlm_traverse_files(sb, nlmsvc_always_match, nlmsvc_match_sb);
	432	return ret ? -EIO : 0;
1da177e4	433	}
17efa372	434	EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
4373ea84 WC	435
	436	static int
	437	nlmsvc_match_ip(void datap, struct nlm_host host)
	438	{
4516fc04	439	return rpc_cmp_addr(nlm_srcaddr(host), datap);
4373ea84 WC	440	}
4373ea84 WC	441
367c8c7b CL	442	/**
	443	* nlmsvc_unlock_all_by_ip - release local locks by IP address
	444	* @server_addr: server's IP address as seen by clients
	445	*
	446	* Release all locks held by clients accessing this host
	447	* via the passed in IP address.
	448	*/
4373ea84	449	int
367c8c7b	450	nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
4373ea84 WC	451	{
4373ea84 WC	452	int ret;
4373ea84	453
367c8c7b CL	454	ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
367c8c7b CL	455	return ret ? -EIO : 0;
4373ea84 WC	456	}
4373ea84 WC	457	EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);