Contributors: 21
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
865 |
43.95% |
27 |
32.53% |
| J. Bruce Fields |
248 |
12.60% |
9 |
10.84% |
| Olaf Kirch |
191 |
9.71% |
4 |
4.82% |
| S. Wendy Cheng |
179 |
9.10% |
2 |
2.41% |
| Jeff Layton |
174 |
8.84% |
11 |
13.25% |
| Chuck Lever |
99 |
5.03% |
5 |
6.02% |
| Trond Myklebust |
59 |
3.00% |
3 |
3.61% |
| Stanislav Kinsbursky |
40 |
2.03% |
1 |
1.20% |
| Neil Brown |
37 |
1.88% |
3 |
3.61% |
| Ingo Molnar |
20 |
1.02% |
1 |
1.20% |
| Al Viro |
14 |
0.71% |
5 |
6.02% |
| Vasily Averin |
11 |
0.56% |
1 |
1.20% |
| Arnd Bergmann |
8 |
0.41% |
1 |
1.20% |
| Marc Eshel |
8 |
0.41% |
2 |
2.41% |
| Benjamin Coddington |
5 |
0.25% |
1 |
1.20% |
| Linus Torvalds |
3 |
0.15% |
2 |
2.41% |
| Christoph Hellwig |
3 |
0.15% |
1 |
1.20% |
| Panagiotis Issaris |
1 |
0.05% |
1 |
1.20% |
| Thomas Gleixner |
1 |
0.05% |
1 |
1.20% |
| Dave Jones |
1 |
0.05% |
1 |
1.20% |
| Mark Salter |
1 |
0.05% |
1 |
1.20% |
| Total |
1968 |
|
83 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 = nlmsvc_file_inode(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);
}
int lock_to_openmode(struct file_lock *lock)
{
return lock_is_write(lock) ? O_WRONLY : O_RDONLY;
}
/*
* Open the file. Note that if we're reexporting, for example,
* this could block the lockd thread for a while.
*
* We have to make sure we have the right credential to open
* the file.
*/
static __be32 nlm_do_fopen(struct svc_rqst *rqstp,
struct nlm_file *file, int mode)
{
struct file **fp = &file->f_file[mode];
__be32 nfserr;
if (*fp)
return 0;
nfserr = nlmsvc_ops->fopen(rqstp, &file->f_handle, fp, mode);
if (nfserr)
dprintk("lockd: open failed (error %d)\n", nfserr);
return nfserr;
}
/*
* Lookup file info. If it doesn't exist, create a file info struct
* and open a (VFS) file for the given inode.
*/
__be32
nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
struct nlm_lock *lock)
{
struct nlm_file *file;
unsigned int hash;
__be32 nfserr;
int mode;
nlm_debug_print_fh("nlm_lookup_file", &lock->fh);
hash = file_hash(&lock->fh);
mode = lock_to_openmode(&lock->fl);
/* 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, &lock->fh)) {
mutex_lock(&file->f_mutex);
nfserr = nlm_do_fopen(rqstp, file, mode);
mutex_unlock(&file->f_mutex);
goto found;
}
nlm_debug_print_fh("creating file for", &lock->fh);
nfserr = nlm_lck_denied_nolocks;
file = kzalloc(sizeof(*file), GFP_KERNEL);
if (!file)
goto out_free;
memcpy(&file->f_handle, &lock->fh, sizeof(struct nfs_fh));
mutex_init(&file->f_mutex);
INIT_HLIST_NODE(&file->f_list);
INIT_LIST_HEAD(&file->f_blocks);
nfserr = nlm_do_fopen(rqstp, file, mode);
if (nfserr)
goto out_unlock;
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++;
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);
if (file->f_file[O_RDONLY])
nlmsvc_ops->fclose(file->f_file[O_RDONLY]);
if (file->f_file[O_WRONLY])
nlmsvc_ops->fclose(file->f_file[O_WRONLY]);
kfree(file);
} else {
printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
}
}
static int nlm_unlock_files(struct nlm_file *file, const struct file_lock *fl)
{
struct file_lock lock;
locks_init_lock(&lock);
lock.c.flc_type = F_UNLCK;
lock.fl_start = 0;
lock.fl_end = OFFSET_MAX;
lock.c.flc_owner = fl->c.flc_owner;
lock.c.flc_pid = fl->c.flc_pid;
lock.c.flc_flags = FL_POSIX;
lock.c.flc_file = file->f_file[O_RDONLY];
if (lock.c.flc_file && vfs_lock_file(lock.c.flc_file, F_SETLK, &lock, NULL))
goto out_err;
lock.c.flc_file = file->f_file[O_WRONLY];
if (lock.c.flc_file && vfs_lock_file(lock.c.flc_file, F_SETLK, &lock, NULL))
goto out_err;
return 0;
out_err:
pr_warn("lockd: unlock failure in %s:%d\n", __FILE__, __LINE__);
return 1;
}
/*
* 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 = locks_inode_context(inode);
struct nlm_host *lockhost;
if (!flctx || list_empty_careful(&flctx->flc_posix))
return 0;
again:
file->f_locks = 0;
spin_lock(&flctx->flc_lock);
for_each_file_lock(fl, &flctx->flc_posix) {
if (fl->fl_lmops != &nlmsvc_lock_operations)
continue;
/* update current lock count */
file->f_locks++;
lockhost = ((struct nlm_lockowner *) fl->c.flc_owner)->host;
if (match(lockhost, host)) {
spin_unlock(&flctx->flc_lock);
if (nlm_unlock_files(file, fl))
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 = locks_inode_context(inode);
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);
for_each_file_lock(fl, &flctx->flc_posix) {
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;
}
static void nlm_close_files(struct nlm_file *file)
{
if (file->f_file[O_RDONLY])
nlmsvc_ops->fclose(file->f_file[O_RDONLY]);
if (file->f_file[O_WRONLY])
nlmsvc_ops->fclose(file->f_file[O_WRONLY]);
}
/*
* 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);
nlm_close_files(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 == nlmsvc_file_inode(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);