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NFS: Add an nfsiod workqueue 

NFS post-rpciod cleanups often involve tasks that cannot be safely
performed within the rpciod context (due to deadlock concerns). We
therefore add a dedicated NFS workqueue that can perform tasks like
cleaning up state after an interrupted NFSv4 open() call, or calling
put_nfs_open_context() after an asynchronous read or write call.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-02-19 20:04:22 -05:00
parent 32bfb5c0f4
commit 5746006f1d
2 changed files with 38 additions and 0 deletions
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37
fs/nfs/inode.c
View File

@ -1219,6 +1219,36 @@ static void nfs_destroy_inodecache(void)
kmem_cache_destroy(nfs_inode_cachep);
}
struct workqueue_struct *nfsiod_workqueue;
/*
* start up the nfsiod workqueue
*/
static int nfsiod_start(void)
{
struct workqueue_struct *wq;
dprintk("RPC: creating workqueue nfsiod\n");
wq = create_singlethread_workqueue("nfsiod");
if (wq == NULL)
return -ENOMEM;
nfsiod_workqueue = wq;
return 0;
}
/*
* Destroy the nfsiod workqueue
*/
static void nfsiod_stop(void)
{
struct workqueue_struct *wq;
wq = nfsiod_workqueue;
if (wq == NULL)
return;
nfsiod_workqueue = NULL;
destroy_workqueue(wq);
}
/*
* Initialize NFS
*/
@ -1226,6 +1256,10 @@ static int __init init_nfs_fs(void)
{
int err;
err = nfsiod_start();
if (err)
goto out6;
err = nfs_fs_proc_init();
if (err)
goto out5;
@ -1272,6 +1306,8 @@ static int __init init_nfs_fs(void)
out4:
nfs_fs_proc_exit();
out5:
nfsiod_stop();
out6:
return err;
}
@ -1287,6 +1323,7 @@ static void __exit exit_nfs_fs(void)
#endif
unregister_nfs_fs();
nfs_fs_proc_exit();
nfsiod_stop();
}
/* Not quite true; I just maintain it */

1
fs/nfs/internal.h
View File

@ -143,6 +143,7 @@ extern struct rpc_procinfo nfs4_procedures[];
extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
/* inode.c */
extern struct workqueue_struct *nfsiod_workqueue;
extern struct inode *nfs_alloc_inode(struct super_block *sb);
extern void nfs_destroy_inode(struct inode *);
extern int nfs_write_inode(struct inode *,int);