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NFSv4: Remove obsolete state_owner and lock_owner semaphores 

OPEN, CLOSE, etc no longer need these semaphores to ensure ordering of
 requests.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-10-18 14:20:13 -07:00
parent 9512135df1
commit e6dfa553cf
3 changed files with 4 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/nfs/nfs4_fs.h
View File

@ -125,16 +125,11 @@ static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status
* NFS4 state_owners and lock_owners are simply labels for ordered
* sequences of RPC calls. Their sole purpose is to provide once-only
* semantics by allowing the server to identify replayed requests.
*
* The ->so_sema is held during all state_owner seqid-mutating operations:
* OPEN, OPEN_DOWNGRADE, and CLOSE. Its purpose is to properly serialize
* so_seqid.
*/
struct nfs4_state_owner {
struct list_head so_list; /* per-clientid list of state_owners */
struct nfs4_client *so_client;
u32 so_id; /* 32-bit identifier, unique */
struct semaphore so_sema;
atomic_t so_count;
struct rpc_cred *so_cred; /* Associated cred */
@ -183,7 +178,6 @@ struct nfs4_state {
struct inode *inode; /* Pointer to the inode */
unsigned long flags; /* Do we hold any locks? */
struct semaphore lock_sema; /* Serializes file locking operations */
spinlock_t state_lock; /* Protects the lock_states list */
nfs4_stateid stateid;

18
fs/nfs/nfs4proc.c
View File

@ -224,7 +224,6 @@ static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid,
/*
* OPEN_RECLAIM:
* reclaim state on the server after a reboot.
* Assumes caller is holding the sp->so_sem
*/
static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
{
@ -322,7 +321,6 @@ static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state
};
int status = 0;
down(&sp->so_sema);
if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
goto out;
if (state->state == 0)
@ -342,7 +340,6 @@ static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state
}
nfs_free_seqid(arg.seqid);
out:
up(&sp->so_sema);
dput(parent);
return status;
}
@ -595,7 +592,6 @@ static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred
dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
goto out_err;
}
down(&sp->so_sema);
state = nfs4_get_open_state(inode, sp);
if (state == NULL)
goto out_err;
@ -620,7 +616,6 @@ static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred
set_bit(NFS_DELEGATED_STATE, &state->flags);
update_open_stateid(state, &delegation->stateid, open_flags);
out_ok:
up(&sp->so_sema);
nfs4_put_state_owner(sp);
up_read(&nfsi->rwsem);
up_read(&clp->cl_sem);
@ -631,7 +626,6 @@ static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred
if (sp != NULL) {
if (state != NULL)
nfs4_put_open_state(state);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
}
up_read(&nfsi->rwsem);
@ -696,7 +690,6 @@ static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, st
} else
o_arg.u.attrs = sattr;
/* Serialization for the sequence id */
down(&sp->so_sema);
o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
if (o_arg.seqid == NULL)
@ -716,7 +709,6 @@ static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, st
if (o_res.delegation_type != 0)
nfs_inode_set_delegation(inode, cred, &o_res);
nfs_free_seqid(o_arg.seqid);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
up_read(&clp->cl_sem);
*res = state;
@ -726,7 +718,6 @@ static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, st
if (state != NULL)
nfs4_put_open_state(state);
nfs_free_seqid(o_arg.seqid);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
}
/* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
@ -833,7 +824,6 @@ static void nfs4_free_closedata(struct nfs4_closedata *calldata)
nfs4_put_open_state(calldata->state);
nfs_free_seqid(calldata->arg.seqid);
up(&sp->so_sema);
nfs4_put_state_owner(sp);
up_read(&server->nfs4_state->cl_sem);
kfree(calldata);
@ -2702,7 +2692,6 @@ static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock
down_read(&clp->cl_sem);
nlo.clientid = clp->cl_clientid;
down(&state->lock_sema);
status = nfs4_set_lock_state(state, request);
if (status != 0)
goto out;
@ -2729,7 +2718,6 @@ static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock
status = 0;
}
out:
up(&state->lock_sema);
up_read(&clp->cl_sem);
return status;
}
@ -2791,7 +2779,6 @@ static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock
int status;
down_read(&clp->cl_sem);
down(&state->lock_sema);
status = nfs4_set_lock_state(state, request);
if (status != 0)
goto out;
@ -2813,7 +2800,6 @@ static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock
sizeof(lsp->ls_stateid.data));
nfs_free_seqid(luargs.seqid);
out:
up(&state->lock_sema);
if (status == 0)
do_vfs_lock(request->fl_file, request);
up_read(&clp->cl_sem);
@ -2877,7 +2863,6 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *r
largs.u.open_lock = &otl;
largs.new_lock_owner = 1;
arg.u.lock = &largs;
down(&owner->so_sema);
otl.open_seqid = nfs_alloc_seqid(&owner->so_seqid);
if (otl.open_seqid != NULL) {
status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR);
@ -2885,7 +2870,6 @@ static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *r
nfs_increment_open_seqid(status, otl.open_seqid);
nfs_free_seqid(otl.open_seqid);
}
up(&owner->so_sema);
if (status == 0)
nfs_confirm_seqid(&lsp->ls_seqid, 0);
} else {
@ -2944,11 +2928,9 @@ static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock
int status;
down_read(&clp->cl_sem);
down(&state->lock_sema);
status = nfs4_set_lock_state(state, request);
if (status == 0)
status = _nfs4_do_setlk(state, cmd, request, 0);
up(&state->lock_sema);
if (status == 0) {
/* Note: we always want to sleep here! */
request->fl_flags |= FL_SLEEP;

15
fs/nfs/nfs4state.c
View File

@ -267,7 +267,6 @@ nfs4_alloc_state_owner(void)
sp = kzalloc(sizeof(*sp),GFP_KERNEL);
if (!sp)
return NULL;
init_MUTEX(&sp->so_sema);
INIT_LIST_HEAD(&sp->so_states);
INIT_LIST_HEAD(&sp->so_delegations);
rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
@ -362,7 +361,6 @@ nfs4_alloc_open_state(void)
memset(state->stateid.data, 0, sizeof(state->stateid.data));
atomic_set(&state->count, 1);
INIT_LIST_HEAD(&state->lock_states);
init_MUTEX(&state->lock_sema);
spin_lock_init(&state->state_lock);
return state;
}
@ -444,7 +442,6 @@ nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
state = __nfs4_find_state_byowner(inode, owner);
if (state == NULL && new != NULL) {
state = new;
/* Caller *must* be holding owner->so_sem */
/* Note: The reclaim code dictates that we add stateless
* and read-only stateids to the end of the list */
list_add_tail(&state->open_states, &owner->so_states);
@ -464,7 +461,7 @@ nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
/*
* Beware! Caller must be holding exactly one
* reference to clp->cl_sem and owner->so_sema!
* reference to clp->cl_sem!
*/
void nfs4_put_open_state(struct nfs4_state *state)
{
@ -485,7 +482,6 @@ void nfs4_put_open_state(struct nfs4_state *state)
/*
* Beware! Caller must be holding no references to clp->cl_sem!
* of owner->so_sema!
*/
void nfs4_close_state(struct nfs4_state *state, mode_t mode)
{
@ -496,7 +492,6 @@ void nfs4_close_state(struct nfs4_state *state, mode_t mode)
atomic_inc(&owner->so_count);
down_read(&clp->cl_sem);
down(&owner->so_sema);
/* Protect against nfs4_find_state() */
spin_lock(&inode->i_lock);
if (mode & FMODE_READ)
@ -527,7 +522,6 @@ void nfs4_close_state(struct nfs4_state *state, mode_t mode)
}
out:
nfs4_put_open_state(state);
up(&owner->so_sema);
nfs4_put_state_owner(owner);
up_read(&clp->cl_sem);
}
@ -553,7 +547,6 @@ __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
* Return a compatible lock_state. If no initialized lock_state structure
* exists, return an uninitialized one.
*
* The caller must be holding state->lock_sema
*/
static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
{
@ -577,7 +570,7 @@ static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, f
* Return a compatible lock_state. If no initialized lock_state structure
* exists, return an uninitialized one.
*
* The caller must be holding state->lock_sema and clp->cl_sem
* The caller must be holding clp->cl_sem
*/
static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner)
{
@ -711,7 +704,7 @@ void nfs_free_seqid(struct nfs_seqid *seqid)
}
/*
* Called with sp->so_sema and clp->cl_sem held.
* Called with clp->cl_sem held.
*
* Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or
* failed with a seqid incrementing error -
@ -750,7 +743,7 @@ void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid)
}
/*
* Called with ls->lock_sema and clp->cl_sem held.
* Called with clp->cl_sem held.
*
* Increment the seqid if the LOCK/LOCKU succeeded, or
* failed with a seqid incrementing error -