Commit 1daef0a8 authored by Trond Myklebust's avatar Trond Myklebust

NFS: Clean up nfs_sb_active/nfs_sb_deactive

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: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent d5e66348
...@@ -850,7 +850,6 @@ static struct nfs_server *nfs_alloc_server(void) ...@@ -850,7 +850,6 @@ static struct nfs_server *nfs_alloc_server(void)
INIT_LIST_HEAD(&server->client_link); INIT_LIST_HEAD(&server->client_link);
INIT_LIST_HEAD(&server->master_link); INIT_LIST_HEAD(&server->master_link);
init_waitqueue_head(&server->active_wq);
atomic_set(&server->active, 0); atomic_set(&server->active, 0);
server->io_stats = nfs_alloc_iostats(); server->io_stats = nfs_alloc_iostats();
......
...@@ -163,8 +163,8 @@ extern struct rpc_stat nfs_rpcstat; ...@@ -163,8 +163,8 @@ extern struct rpc_stat nfs_rpcstat;
extern int __init register_nfs_fs(void); extern int __init register_nfs_fs(void);
extern void __exit unregister_nfs_fs(void); extern void __exit unregister_nfs_fs(void);
extern void nfs_sb_active(struct nfs_server *server); extern void nfs_sb_active(struct super_block *sb);
extern void nfs_sb_deactive(struct nfs_server *server); extern void nfs_sb_deactive(struct super_block *sb);
/* namespace.c */ /* namespace.c */
extern char *nfs_path(const char *base, extern char *nfs_path(const char *base,
......
...@@ -209,7 +209,6 @@ static int nfs_get_sb(struct file_system_type *, int, const char *, void *, stru ...@@ -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, static int nfs_xdev_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt); int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
static void nfs_kill_super(struct super_block *); 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 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
static struct file_system_type nfs_fs_type = { static struct file_system_type nfs_fs_type = {
...@@ -232,7 +231,6 @@ static const struct super_operations nfs_sops = { ...@@ -232,7 +231,6 @@ static const struct super_operations nfs_sops = {
.alloc_inode = nfs_alloc_inode, .alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode, .destroy_inode = nfs_destroy_inode,
.write_inode = nfs_write_inode, .write_inode = nfs_write_inode,
.put_super = nfs_put_super,
.statfs = nfs_statfs, .statfs = nfs_statfs,
.clear_inode = nfs_clear_inode, .clear_inode = nfs_clear_inode,
.umount_begin = nfs_umount_begin, .umount_begin = nfs_umount_begin,
...@@ -337,26 +335,20 @@ void __exit unregister_nfs_fs(void) ...@@ -337,26 +335,20 @@ void __exit unregister_nfs_fs(void)
unregister_filesystem(&nfs_fs_type); unregister_filesystem(&nfs_fs_type);
} }
void nfs_sb_active(struct nfs_server *server) void nfs_sb_active(struct super_block *sb)
{ {
atomic_inc(&server->active); struct nfs_server *server = NFS_SB(sb);
}
void nfs_sb_deactive(struct nfs_server *server) if (atomic_inc_return(&server->active) == 1)
{ atomic_inc(&sb->s_active);
if (atomic_dec_and_test(&server->active))
wake_up(&server->active_wq);
} }
static void nfs_put_super(struct super_block *sb) void nfs_sb_deactive(struct super_block *sb)
{ {
struct nfs_server *server = NFS_SB(sb); struct nfs_server *server = NFS_SB(sb);
/*
* Make sure there are no outstanding ops to this server. if (atomic_dec_and_test(&server->active))
* If so, wait for them to finish before allowing the deactivate_super(sb);
* unmount to continue.
*/
wait_event(server->active_wq, atomic_read(&server->active) == 0);
} }
/* /*
......
...@@ -99,7 +99,7 @@ static void nfs_async_unlink_release(void *calldata) ...@@ -99,7 +99,7 @@ static void nfs_async_unlink_release(void *calldata)
nfs_dec_sillycount(data->dir); nfs_dec_sillycount(data->dir);
nfs_free_unlinkdata(data); nfs_free_unlinkdata(data);
nfs_sb_deactive(NFS_SB(sb)); nfs_sb_deactive(sb);
} }
static const struct rpc_call_ops nfs_unlink_ops = { 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 ...@@ -118,6 +118,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
.rpc_message = &msg, .rpc_message = &msg,
.callback_ops = &nfs_unlink_ops, .callback_ops = &nfs_unlink_ops,
.callback_data = data, .callback_data = data,
.workqueue = nfsiod_workqueue,
.flags = RPC_TASK_ASYNC, .flags = RPC_TASK_ASYNC,
}; };
struct rpc_task *task; struct rpc_task *task;
...@@ -149,7 +150,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n ...@@ -149,7 +150,7 @@ static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct n
nfs_dec_sillycount(dir); nfs_dec_sillycount(dir);
return 0; return 0;
} }
nfs_sb_active(NFS_SERVER(dir)); nfs_sb_active(dir->i_sb);
data->args.fh = NFS_FH(dir); data->args.fh = NFS_FH(dir);
nfs_fattr_init(&data->res.dir_attr); nfs_fattr_init(&data->res.dir_attr);
......
...@@ -119,7 +119,6 @@ struct nfs_server { ...@@ -119,7 +119,6 @@ struct nfs_server {
void (*destroy)(struct nfs_server *); void (*destroy)(struct nfs_server *);
atomic_t active; /* Keep trace of any activity to this 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 */ /* mountd-related mount options */
struct sockaddr_storage mountd_address; struct sockaddr_storage mountd_address;
......
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