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| author | Weston Andros Adamson <dros@netapp.com> | 2012-10-30 22:01:39 +0100 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-10-31 21:26:26 +0100 |
| commit | 324d003b0cd82151adbaecefef57b73f7959a469 (patch) | |
| tree | 9876567e78d72999d47feaf1fc957b3615a18c31 /fs/nfs/internal.h | |
| parent | nfs: Show original device name verbatim in /proc/*/mount{s,info} (diff) | |
| download | linux-324d003b0cd82151adbaecefef57b73f7959a469.tar.xz linux-324d003b0cd82151adbaecefef57b73f7959a469.zip | |
NFS: add nfs_sb_deactive_async to avoid deadlock
Use nfs_sb_deactive_async instead of nfs_sb_deactive when in a workqueue
context. This avoids a deadlock where rpc_shutdown_client loops forever
in a workqueue kworker context, trying to kill all RPC tasks associated with
the client, while one or more of these tasks have already been assigned to the
same kworker (and will never run rpc_exit_task).
This approach is needed because RPC tasks that have already been assigned
to a kworker by queue_work cannot be canceled, as explained in the comment
for workqueue.c:insert_wq_barrier.
Signed-off-by: Weston Andros Adamson <dros@netapp.com>
[Trond: add module_get/put.]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/internal.h')
| -rw-r--r-- | fs/nfs/internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index a54fe51c1dfb..05521cadac2e 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -351,6 +351,7 @@ 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 |