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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-01-11 16:39:51 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-02-01 10:13:48 -0500
commit322b2b9032f4beba6f1c4158852a5a5b9ab841d7 (patch)
tree01e0d696fc636318c63543b46d988876ff329ee4
parent77102893ae685270c1774fa8b7eead6ad93c838d (diff)
downloadleg-kernel-322b2b9032f4beba6f1c4158852a5a5b9ab841d7.tar.gz
Revert "NFS: add nfs_sb_deactive_async to avoid deadlock"
This reverts commit 324d003b0cd82151adbaecefef57b73f7959a469. The deadlock turned out to be caused by a workqueue limitation that has now been worked around in the RPC code (see comment in rpc_free_task). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/inode.c5
-rw-r--r--fs/nfs/internal.h1
-rw-r--r--fs/nfs/nfs4proc.c2
-rw-r--r--fs/nfs/super.c49
-rw-r--r--fs/nfs/unlink.c2
5 files changed, 3 insertions, 56 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index ebeb94ce1b0b..6acc73c80d7f 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -694,10 +694,7 @@ static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
if (ctx->cred != NULL)
put_rpccred(ctx->cred);
dput(ctx->dentry);
- if (is_sync)
- nfs_sb_deactive(sb);
- else
- nfs_sb_deactive_async(sb);
+ nfs_sb_deactive(sb);
kfree(ctx->mdsthreshold);
kfree(ctx);
}
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index f0e6c7df1a07..541c9ebdbc5a 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -329,7 +329,6 @@ extern int __init register_nfs_fs(void);
extern void __exit unregister_nfs_fs(void);
extern void nfs_sb_active(struct super_block *sb);
extern void nfs_sb_deactive(struct super_block *sb);
-extern void nfs_sb_deactive_async(struct super_block *sb);
/* namespace.c */
#define NFS_PATH_CANONICAL 1
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index cf747ef86650..62fa4001e47a 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2088,7 +2088,7 @@ static void nfs4_free_closedata(void *data)
nfs4_put_open_state(calldata->state);
nfs_free_seqid(calldata->arg.seqid);
nfs4_put_state_owner(sp);
- nfs_sb_deactive_async(sb);
+ nfs_sb_deactive(sb);
kfree(calldata);
}
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index b056b1628722..befbae0cce41 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -54,7 +54,6 @@
#include <linux/parser.h>
#include <linux/nsproxy.h>
#include <linux/rcupdate.h>
-#include <linux/kthread.h>
#include <asm/uaccess.h>
@@ -418,54 +417,6 @@ void nfs_sb_deactive(struct super_block *sb)
}
EXPORT_SYMBOL_GPL(nfs_sb_deactive);
-static int nfs_deactivate_super_async_work(void *ptr)
-{
- struct super_block *sb = ptr;
-
- deactivate_super(sb);
- module_put_and_exit(0);
- return 0;
-}
-
-/*
- * same effect as deactivate_super, but will do final unmount in kthread
- * context
- */
-static void nfs_deactivate_super_async(struct super_block *sb)
-{
- struct task_struct *task;
- char buf[INET6_ADDRSTRLEN + 1];
- struct nfs_server *server = NFS_SB(sb);
- struct nfs_client *clp = server->nfs_client;
-
- if (!atomic_add_unless(&sb->s_active, -1, 1)) {
- rcu_read_lock();
- snprintf(buf, sizeof(buf),
- rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
- rcu_read_unlock();
-
- __module_get(THIS_MODULE);
- task = kthread_run(nfs_deactivate_super_async_work, sb,
- "%s-deactivate-super", buf);
- if (IS_ERR(task)) {
- pr_err("%s: kthread_run: %ld\n",
- __func__, PTR_ERR(task));
- /* make synchronous call and hope for the best */
- deactivate_super(sb);
- module_put(THIS_MODULE);
- }
- }
-}
-
-void nfs_sb_deactive_async(struct super_block *sb)
-{
- struct nfs_server *server = NFS_SB(sb);
-
- if (atomic_dec_and_test(&server->active))
- nfs_deactivate_super_async(sb);
-}
-EXPORT_SYMBOL_GPL(nfs_sb_deactive_async);
-
/*
* Deliver file system statistics to userspace
*/
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 3f79c77153b8..13cea637eff8 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -95,7 +95,7 @@ static void nfs_async_unlink_release(void *calldata)
nfs_dec_sillycount(data->dir);
nfs_free_unlinkdata(data);
- nfs_sb_deactive_async(sb);
+ nfs_sb_deactive(sb);
}
static void nfs_unlink_prepare(struct rpc_task *task, void *calldata)