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authorDavid Howells <dhowells@redhat.com>2006-11-22 14:55:48 +0000
committerDavid Howells <dhowells@redhat.com>2006-11-22 14:55:48 +0000
commit65f27f38446e1976cc98fd3004b110fedcddd189 (patch)
tree68f8be93feae31dfa018c22db392a05546b63ee1 /fs/nfs
parent365970a1ea76d81cb1ad2f652acb605f06dae256 (diff)
downloadop-kernel-dev-65f27f38446e1976cc98fd3004b110fedcddd189.zip
op-kernel-dev-65f27f38446e1976cc98fd3004b110fedcddd189.tar.gz
WorkStruct: Pass the work_struct pointer instead of context data
Pass the work_struct pointer to the work function rather than context data. The work function can use container_of() to work out the data. For the cases where the container of the work_struct may go away the moment the pending bit is cleared, it is made possible to defer the release of the structure by deferring the clearing of the pending bit. To make this work, an extra flag is introduced into the management side of the work_struct. This governs auto-release of the structure upon execution. Ordinarily, the work queue executor would release the work_struct for further scheduling or deallocation by clearing the pending bit prior to jumping to the work function. This means that, unless the driver makes some guarantee itself that the work_struct won't go away, the work function may not access anything else in the work_struct or its container lest they be deallocated.. This is a problem if the auxiliary data is taken away (as done by the last patch). However, if the pending bit is *not* cleared before jumping to the work function, then the work function *may* access the work_struct and its container with no problems. But then the work function must itself release the work_struct by calling work_release(). In most cases, automatic release is fine, so this is the default. Special initiators exist for the non-auto-release case (ending in _NAR). Signed-Off-By: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/client.c2
-rw-r--r--fs/nfs/namespace.c9
-rw-r--r--fs/nfs/nfs4_fs.h2
-rw-r--r--fs/nfs/nfs4renewd.c5
4 files changed, 9 insertions, 9 deletions
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 6f0487d..23ab145 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -143,7 +143,7 @@ static struct nfs_client *nfs_alloc_client(const char *hostname,
INIT_LIST_HEAD(&clp->cl_state_owners);
INIT_LIST_HEAD(&clp->cl_unused);
spin_lock_init(&clp->cl_lock);
- INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state, clp);
+ INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
clp->cl_boot_time = CURRENT_TIME;
clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 5ed798bc..371b804e 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -18,11 +18,10 @@
#define NFSDBG_FACILITY NFSDBG_VFS
-static void nfs_expire_automounts(void *list);
+static void nfs_expire_automounts(struct work_struct *work);
LIST_HEAD(nfs_automount_list);
-static DECLARE_DELAYED_WORK(nfs_automount_task, nfs_expire_automounts,
- &nfs_automount_list);
+static DECLARE_DELAYED_WORK(nfs_automount_task, nfs_expire_automounts);
int nfs_mountpoint_expiry_timeout = 500 * HZ;
static struct vfsmount *nfs_do_submount(const struct vfsmount *mnt_parent,
@@ -165,9 +164,9 @@ struct inode_operations nfs_referral_inode_operations = {
.follow_link = nfs_follow_mountpoint,
};
-static void nfs_expire_automounts(void *data)
+static void nfs_expire_automounts(struct work_struct *work)
{
- struct list_head *list = (struct list_head *)data;
+ struct list_head *list = &nfs_automount_list;
mark_mounts_for_expiry(list);
if (!list_empty(list))
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 6f34667..c26cd97 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -185,7 +185,7 @@ extern const u32 nfs4_fs_locations_bitmap[2];
extern void nfs4_schedule_state_renewal(struct nfs_client *);
extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
extern void nfs4_kill_renewd(struct nfs_client *);
-extern void nfs4_renew_state(void *);
+extern void nfs4_renew_state(struct work_struct *);
/* nfs4state.c */
struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp);
diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c
index 7b6df18..8232985 100644
--- a/fs/nfs/nfs4renewd.c
+++ b/fs/nfs/nfs4renewd.c
@@ -59,9 +59,10 @@
#define NFSDBG_FACILITY NFSDBG_PROC
void
-nfs4_renew_state(void *data)
+nfs4_renew_state(struct work_struct *work)
{
- struct nfs_client *clp = (struct nfs_client *)data;
+ struct nfs_client *clp =
+ container_of(work, struct nfs_client, cl_renewd.work);
struct rpc_cred *cred;
long lease, timeout;
unsigned long last, now;
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