Release 4.11 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]);
}

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76
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76
100.00%
1
100.00%



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);
}
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Chuck Lever
42
93.33%
1
50.00%
Al Viro
3
6.67%
1
50.00%
Total
45
100.00%
2
100.00%

#else


static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
{
	return;
}

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1
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17
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1
100.00%



static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
{
	return;
}
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17
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1
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#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);
}

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Linus Torvalds (pre-git)
53
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3
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53
100.00%
3
100.00%

/*
 * 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;
}

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Linus Torvalds (pre-git)
202
81.78%
8
44.44%
Olaf Kirch
29
11.74%
3
16.67%
Chuck Lever
5
2.02%
1
5.56%
Ingo Molnar
4
1.62%
1
5.56%
Al Viro
2
0.81%
1
5.56%
Neil Brown
2
0.81%
1
5.56%
Panagiotis Issaris
1
0.40%
1
5.56%
J. Bruce Fields
1
0.40%
1
5.56%
Trond Myklebust
1
0.40%
1
5.56%
Total
247
100.00%
18
100.00%

/*
 * 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");
	}
}

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Linus Torvalds (pre-git)
45
71.43%
1
33.33%
Olaf Kirch
15
23.81%
1
33.33%
Chuck Lever
3
4.76%
1
33.33%
Total
63
100.00%
3
100.00%

/*
 * 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;
}

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Linus Torvalds (pre-git)
135
65.22%
2
20.00%
Jeff Layton
54
26.09%
3
30.00%
Olaf Kirch
7
3.38%
1
10.00%
Marc Eshel
5
2.42%
2
20.00%
Arnd Bergmann
3
1.45%
1
10.00%
J. Bruce Fields
3
1.45%
1
10.00%
Total
207
100.00%
10
100.00%


static int

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

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1
100.00%
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18
100.00%
1
100.00%

/*
 * 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);
}

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Olaf Kirch
31
64.58%
1
50.00%
Linus Torvalds (pre-git)
17
35.42%
1
50.00%
Total
48
100.00%
2
100.00%

/*
 * 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;
}

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Jeff Layton
53
40.77%
3
37.50%
Olaf Kirch
48
36.92%
2
25.00%
Linus Torvalds (pre-git)
23
17.69%
1
12.50%
Arnd Bergmann
5
3.85%
1
12.50%
J. Bruce Fields
1
0.77%
1
12.50%
Total
130
100.00%
8
100.00%

/*
 * 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;
}

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Linus Torvalds (pre-git)
98
51.85%
1
12.50%
S. Wendy Cheng
32
16.93%
2
25.00%
Olaf Kirch
28
14.81%
3
37.50%
Trond Myklebust
26
13.76%
1
12.50%
Ingo Molnar
5
2.65%
1
12.50%
Total
189
100.00%
8
100.00%

/*
 * 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);
}

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Linus Torvalds (pre-git)
49
89.09%
1
33.33%
Ingo Molnar
4
7.27%
1
33.33%
Olaf Kirch
2
3.64%
1
33.33%
Total
55
100.00%
3
100.00%

/*
 * 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;
}

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Stanislav Kinsbursky
21
41.18%
1
33.33%
Olaf Kirch
21
41.18%
1
33.33%
S. Wendy Cheng
9
17.65%
1
33.33%
Total
51
100.00%
3
100.00%


static int

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

	return host == other;
}

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Olaf Kirch
18
66.67%
1
50.00%
S. Wendy Cheng
9
33.33%
1
50.00%
Total
27
100.00%
2
100.00%


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;
}

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Neil Brown
26
50.00%
1
33.33%
Olaf Kirch
17
32.69%
1
33.33%
S. Wendy Cheng
9
17.31%
1
33.33%
Total
52
100.00%
3
100.00%

/*
 * Mark all hosts that still hold resources
 */

void

nlmsvc_mark_resources(struct net *net)
{
	struct nlm_host hint;

	dprintk("lockd: nlmsvc_mark_resources for net %p\n", net);
	hint.net = net;
	nlm_traverse_files(&hint, nlmsvc_mark_host, NULL);
}

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Stanislav Kinsbursky
19
51.35%
1
25.00%
Linus Torvalds (pre-git)
15
40.54%
1
25.00%
S. Wendy Cheng
2
5.41%
1
25.00%
Olaf Kirch
1
2.70%
1
25.00%
Total
37
100.00%
4
100.00%

/*
 * 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();
	}
}

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Linus Torvalds (pre-git)
32
78.05%
1
25.00%
Olaf Kirch
7
17.07%
2
50.00%
S. Wendy Cheng
2
4.88%
1
25.00%
Total
41
100.00%
4
100.00%

/**
 * 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);
}

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Neil Brown
6
35.29%
1
25.00%
S. Wendy Cheng
5
29.41%
1
25.00%
Olaf Kirch
5
29.41%
1
25.00%
Chuck Lever
1
5.88%
1
25.00%
Total
17
100.00%
4
100.00%


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;
}

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S. Wendy Cheng
30
88.24%
1
50.00%
Al Viro
4
11.76%
1
50.00%
Total
34
100.00%
2
100.00%

/**
 * 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;
}
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S. Wendy Cheng
29
90.62%
1
33.33%
Olaf Kirch
2
6.25%
1
33.33%
Neil Brown
1
3.12%
1
33.33%
Total
32
100.00%
3
100.00%


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);
}

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S. Wendy Cheng
18
69.23%
1
20.00%
Chuck Lever
7
26.92%
3
60.00%
Jeff Layton
1
3.85%
1
20.00%
Total
26
100.00%
5
100.00%

/**
 * 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;
}
Contributors
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Tokens
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CommitProp
S. Wendy Cheng
29
90.62%
2
66.67%
Chuck Lever
3
9.38%
1
33.33%
Total
32
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);
Overall Contributors
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CommitProp
Linus Torvalds (pre-git)
724
44.94%
10
21.74%
Olaf Kirch
235
14.59%
4
8.70%
S. Wendy Cheng
206
12.79%
2
4.35%
Chuck Lever
180
11.17%
4
8.70%
Jeff Layton
109
6.77%
5
10.87%
Stanislav Kinsbursky
41
2.55%
1
2.17%
Neil Brown
35
2.17%
3
6.52%
Trond Myklebust
27
1.68%
2
4.35%
Ingo Molnar
18
1.12%
1
2.17%
Al Viro
9
0.56%
3
6.52%
Arnd Bergmann
8
0.50%
1
2.17%
J. Bruce Fields
5
0.31%
3
6.52%
Marc Eshel
5
0.31%
2
4.35%
Tejun Heo
3
0.19%
1
2.17%
Christoph Hellwig
3
0.19%
1
2.17%
Panagiotis Issaris
1
0.06%
1
2.17%
Dave Jones
1
0.06%
1
2.17%
Mark Salter
1
0.06%
1
2.17%
Total
1611
100.00%
46
100.00%
Directory: fs/lockd

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