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lockd: stop abusing file_lock_list

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Currently lockd directly access the file_lock_list from fs/locks.c.
It does so to mark locks granted or reclaimable.  This is very
suboptimal, because a) lockd needs to poke into locks.c internals, and
b) it needs to iterate over all locks in the system for marking locks
granted or reclaimable.

This patch adds lists for granted and reclaimable locks to the nlm_host
structure instead, and adds locks to those.

nlmclnt_lock:
	now adds the lock to h_granted instead of setting the
	NFS_LCK_GRANTED, still O(1)

nlmclnt_mark_reclaim:
	goes away completely, replaced by a list_splice_init.
	Complexity reduced from O(locks in the system) to O(1)

reclaimer:
	iterates over h_reclaim now, complexity reduced from
	O(locks in the system) to O(locks per nlm_host)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Christoph Hellwig 2006-03-20 13:44:40 -05:00 committed by Trond Myklebust
parent 04266473ec
commit 26bcbf965f
7 changed files with 21 additions and 63 deletions
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54
fs/lockd/clntlock.c
View file

@ -154,34 +154,6 @@ u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *lock)
* server crash.
*/
/*
* Mark the locks for reclaiming.
* FIXME: In 2.5 we don't want to iterate through any global file_lock_list.
* Maintain NLM lock reclaiming lists in the nlm_host instead.
*/
static
void nlmclnt_mark_reclaim(struct nlm_host *host)
{
struct file_lock *fl;
struct inode *inode;
struct list_head *tmp;
list_for_each(tmp, &file_lock_list) {
fl = list_entry(tmp, struct file_lock, fl_link);
inode = fl->fl_file->f_dentry->d_inode;
if (inode->i_sb->s_magic != NFS_SUPER_MAGIC)
continue;
if (fl->fl_u.nfs_fl.owner == NULL)
continue;
if (fl->fl_u.nfs_fl.owner->host != host)
continue;
if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_GRANTED))
continue;
fl->fl_u.nfs_fl.flags |= NFS_LCK_RECLAIM;
}
}
/*
* Someone has sent us an SM_NOTIFY. Ensure we bind to the new port number,
* that we mark locks for reclaiming, and that we bump the pseudo NSM state.
@ -194,7 +166,12 @@ void nlmclnt_prepare_reclaim(struct nlm_host *host, u32 newstate)
host->h_state++;
host->h_nextrebind = 0;
nlm_rebind_host(host);
nlmclnt_mark_reclaim(host);
/*
* Mark the locks for reclaiming.
*/
list_splice_init(&host->h_granted, &host->h_reclaim);
dprintk("NLM: reclaiming locks for host %s", host->h_name);
}
@ -223,9 +200,7 @@ reclaimer(void *ptr)
{
struct nlm_host *host = (struct nlm_host *) ptr;
struct nlm_wait *block;
struct list_head *tmp;
struct file_lock *fl;
struct inode *inode;
struct file_lock *fl, *next;
daemonize("%s-reclaim", host->h_name);
allow_signal(SIGKILL);
@ -237,20 +212,9 @@ reclaimer(void *ptr)
/* First, reclaim all locks that have been marked. */
restart:
list_for_each(tmp, &file_lock_list) {
fl = list_entry(tmp, struct file_lock, fl_link);
list_for_each_entry_safe(fl, next, &host->h_reclaim, fl_u.nfs_fl.list) {
list_del(&fl->fl_u.nfs_fl.list);
inode = fl->fl_file->f_dentry->d_inode;
if (inode->i_sb->s_magic != NFS_SUPER_MAGIC)
continue;
if (fl->fl_u.nfs_fl.owner == NULL)
continue;
if (fl->fl_u.nfs_fl.owner->host != host)
continue;
if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_RECLAIM))
continue;
fl->fl_u.nfs_fl.flags &= ~NFS_LCK_RECLAIM;
nlmclnt_reclaim(host, fl);
if (signalled())
break;

11
fs/lockd/clntproc.c
View file

@ -465,7 +465,6 @@ static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *ho
{
BUG_ON(fl->fl_ops != NULL);
fl->fl_u.nfs_fl.state = 0;
fl->fl_u.nfs_fl.flags = 0;
fl->fl_u.nfs_fl.owner = nlm_find_lockowner(host, fl->fl_owner);
fl->fl_ops = &nlmclnt_lock_ops;
}
@ -552,8 +551,8 @@ nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
if (resp->status == NLM_LCK_GRANTED) {
fl->fl_u.nfs_fl.state = host->h_state;
fl->fl_u.nfs_fl.flags |= NFS_LCK_GRANTED;
fl->fl_flags |= FL_SLEEP;
list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
do_vfs_lock(fl);
}
status = nlm_stat_to_errno(resp->status);
@ -619,9 +618,11 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
struct nlm_res *resp = &req->a_res;
int status;
/* Clean the GRANTED flag now so the lock doesn't get
* reclaimed while we're stuck in the unlock call. */
fl->fl_u.nfs_fl.flags &= ~NFS_LCK_GRANTED;
/*
* Remove from the granted list now so the lock doesn't get
* reclaimed while we're stuck in the unlock call.
*/
list_del(&fl->fl_u.nfs_fl.list);
/*
* Note: the server is supposed to either grant us the unlock

2
fs/lockd/host.c
View file

@ -123,6 +123,8 @@ nlm_lookup_host(int server, struct sockaddr_in *sin,
nlm_hosts[hash] = host;
INIT_LIST_HEAD(&host->h_lockowners);
spin_lock_init(&host->h_lock);
INIT_LIST_HEAD(&host->h_granted);
INIT_LIST_HEAD(&host->h_reclaim);
if (++nrhosts > NLM_HOST_MAX)
next_gc = 0;

5
fs/locks.c
View file

@ -139,10 +139,7 @@ int lease_break_time = 45;
#define for_each_lock(inode, lockp) \
for (lockp = &inode->i_flock; *lockp != NULL; lockp = &(*lockp)->fl_next)
LIST_HEAD(file_lock_list);
EXPORT_SYMBOL(file_lock_list);
static LIST_HEAD(file_lock_list);
static LIST_HEAD(blocked_list);
static kmem_cache_t *filelock_cache;

2
include/linux/fs.h
View file

@ -730,8 +730,6 @@ struct file_lock {
#define OFFT_OFFSET_MAX INT_LIMIT(off_t)
#endif
extern struct list_head file_lock_list;
#include <linux/fcntl.h>
extern int fcntl_getlk(struct file *, struct flock __user *);

2
include/linux/lockd/lockd.h
View file

@ -59,6 +59,8 @@ struct nlm_host {
unsigned long h_expires; /* eligible for GC */
struct list_head h_lockowners; /* Lockowners for the client */
spinlock_t h_lock;
struct list_head h_granted; /* Locks in GRANTED state */
struct list_head h_reclaim; /* Locks in RECLAIM state */
};
/*

8
include/linux/nfs_fs_i.h
View file

@ -12,8 +12,8 @@ struct nlm_lockowner;
*/
struct nfs_lock_info {
u32 state;
u32 flags;
struct nlm_lockowner *owner;
struct list_head list;
};
struct nfs4_lock_state;
@ -21,10 +21,4 @@ struct nfs4_lock_info {
struct nfs4_lock_state *owner;
};
/*
* Lock flag values
*/
#define NFS_LCK_GRANTED 0x0001 /* lock has been granted */
#define NFS_LCK_RECLAIM 0x0002 /* lock marked for reclaiming */
#endif