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NFS: Clean up nfs_sb_active/nfs_sb_deactive

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Instead of causing umount requests to block on server->active_wq while the
asynchronous sillyrename deletes are executing, we can use the sb->s_active
counter to obtain a reference to the super_block, and then release that
reference in nfs_async_unlink_release().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-07-27 18:19:01 -04:00
parent d5e66348bb
commit 1daef0a868
5 changed files with 17 additions and 26 deletions
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1
fs/nfs/client.c
View File

@ -850,7 +850,6 @@ static struct nfs_server *nfs_alloc_server(void)
INIT_LIST_HEAD(&server->client_link);
INIT_LIST_HEAD(&server->master_link);
init_waitqueue_head(&server->active_wq);
atomic_set(&server->active, 0);
server->io_stats = nfs_alloc_iostats();

4
fs/nfs/internal.h
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@ -163,8 +163,8 @@ extern struct rpc_stat nfs_rpcstat;
extern int __init register_nfs_fs(void);
extern void __exit unregister_nfs_fs(void);
extern void nfs_sb_active(struct nfs_server *server);
extern void nfs_sb_deactive(struct nfs_server *server);
extern void nfs_sb_active(struct super_block *sb);
extern void nfs_sb_deactive(struct super_block *sb);
/* namespace.c */
extern char *nfs_path(const char *base,

32
fs/nfs/super.c
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@ -209,7 +209,6 @@ static int nfs_get_sb(struct file_system_type *, int, const char *, void *, stru
static int nfs_xdev_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static void nfs_kill_super(struct super_block *);
static void nfs_put_super(struct super_block *);
static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
static struct file_system_type nfs_fs_type = {
@ -232,7 +231,6 @@ static const struct super_operations nfs_sops = {
.alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode,
.write_inode = nfs_write_inode,
.put_super = nfs_put_super,
.statfs = nfs_statfs,
.clear_inode = nfs_clear_inode,
.umount_begin = nfs_umount_begin,
@ -337,26 +335,20 @@ void __exit unregister_nfs_fs(void)
unregister_filesystem(&nfs_fs_type);
}
void nfs_sb_active(struct nfs_server *server)
{
atomic_inc(&server->active);
}
void nfs_sb_deactive(struct nfs_server *server)
{
if (atomic_dec_and_test(&server->active))
wake_up(&server->active_wq);
}
static void nfs_put_super(struct super_block *sb)
void nfs_sb_active(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
/*
* Make sure there are no outstanding ops to this server.
* If so, wait for them to finish before allowing the
* unmount to continue.
*/
wait_event(server->active_wq, atomic_read(&server->active) == 0);
if (atomic_inc_return(&server->active) == 1)
atomic_inc(&sb->s_active);
}
void nfs_sb_deactive(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
if (atomic_dec_and_test(&server->active))
deactivate_super(sb);
}
/*

5
fs/nfs/unlink.c
View File

@ -99,7 +99,7 @@ static void nfs_async_unlink_release(void *calldata)
nfs_dec_sillycount(data->dir);
nfs_free_unlinkdata(data);
nfs_sb_deactive(NFS_SB(sb));
nfs_sb_deactive(sb);
}
static const struct rpc_call_ops nfs_unlink_ops = {
@ -118,6 +118,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
.rpc_message = &msg,
.callback_ops = &nfs_unlink_ops,
.callback_data = data,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC,
};
struct rpc_task *task;
@ -149,7 +150,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
nfs_dec_sillycount(dir);
return 0;
}
nfs_sb_active(NFS_SERVER(dir));
nfs_sb_active(dir->i_sb);
data->args.fh = NFS_FH(dir);
nfs_fattr_init(&data->res.dir_attr);

1
include/linux/nfs_fs_sb.h
View File

@ -119,7 +119,6 @@ struct nfs_server {
void (*destroy)(struct nfs_server *);
atomic_t active; /* Keep trace of any activity to this server */
wait_queue_head_t active_wq; /* Wait for any activity to stop */
/* mountd-related mount options */
struct sockaddr_storage mountd_address;