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NFSv4: Fix up locking for nfs4_state_owner

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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-10-20 14:22:47 -07:00
parent 4e51336a00
commit ec07342828
3 changed files with 18 additions and 5 deletions
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1
fs/nfs/nfs4_fs.h
View File

@ -126,6 +126,7 @@ static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status
* semantics by allowing the server to identify replayed requests.
*/
struct nfs4_state_owner {
spinlock_t so_lock;
struct list_head so_list; /* per-clientid list of state_owners */
struct nfs4_client *so_client;
u32 so_id; /* 32-bit identifier, unique */

2
fs/nfs/nfs4proc.c
View File

@ -212,6 +212,7 @@ static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid,
open_flags &= (FMODE_READ|FMODE_WRITE);
/* Protect against nfs4_find_state() */
spin_lock(&state->owner->so_lock);
spin_lock(&inode->i_lock);
state->state |= open_flags;
/* NB! List reordering - see the reclaim code for why. */
@ -221,6 +222,7 @@ static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid,
state->nreaders++;
memcpy(&state->stateid, stateid, sizeof(state->stateid));
spin_unlock(&inode->i_lock);
spin_unlock(&state->owner->so_lock);
}
/*

20
fs/nfs/nfs4state.c
View File

@ -267,6 +267,7 @@ nfs4_alloc_state_owner(void)
sp = kzalloc(sizeof(*sp),GFP_KERNEL);
if (!sp)
return NULL;
spin_lock_init(&sp->so_lock);
INIT_LIST_HEAD(&sp->so_states);
INIT_LIST_HEAD(&sp->so_delegations);
rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue");
@ -438,20 +439,23 @@ nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner)
if (state)
goto out;
new = nfs4_alloc_open_state();
spin_lock(&owner->so_lock);
spin_lock(&inode->i_lock);
state = __nfs4_find_state_byowner(inode, owner);
if (state == NULL && new != NULL) {
state = new;
/* 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);
state->owner = owner;
atomic_inc(&owner->so_count);
list_add(&state->inode_states, &nfsi->open_states);
state->inode = igrab(inode);
spin_unlock(&inode->i_lock);
/* 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);
spin_unlock(&owner->so_lock);
} else {
spin_unlock(&inode->i_lock);
spin_unlock(&owner->so_lock);
if (new)
nfs4_free_open_state(new);
}
@ -468,12 +472,14 @@ void nfs4_put_open_state(struct nfs4_state *state)
struct inode *inode = state->inode;
struct nfs4_state_owner *owner = state->owner;
if (!atomic_dec_and_lock(&state->count, &inode->i_lock))
if (!atomic_dec_and_lock(&state->count, &owner->so_lock))
return;
spin_lock(&inode->i_lock);
if (!list_empty(&state->inode_states))
list_del(&state->inode_states);
spin_unlock(&inode->i_lock);
list_del(&state->open_states);
spin_unlock(&inode->i_lock);
spin_unlock(&owner->so_lock);
iput(inode);
BUG_ON (state->state != 0);
nfs4_free_open_state(state);
@ -491,6 +497,7 @@ void nfs4_close_state(struct nfs4_state *state, mode_t mode)
atomic_inc(&owner->so_count);
/* Protect against nfs4_find_state() */
spin_lock(&owner->so_lock);
spin_lock(&inode->i_lock);
if (mode & FMODE_READ)
state->nreaders--;
@ -503,6 +510,7 @@ void nfs4_close_state(struct nfs4_state *state, mode_t mode)
list_move_tail(&state->open_states, &owner->so_states);
}
spin_unlock(&inode->i_lock);
spin_unlock(&owner->so_lock);
newstate = 0;
if (state->state != 0) {
if (state->nreaders)
@ -899,6 +907,7 @@ static void nfs4_state_mark_reclaim(struct nfs4_client *clp)
list_for_each_entry(sp, &clp->cl_state_owners, so_list) {
sp->so_seqid.counter = 0;
sp->so_seqid.flags = 0;
spin_lock(&sp->so_lock);
list_for_each_entry(state, &sp->so_states, open_states) {
list_for_each_entry(lock, &state->lock_states, ls_locks) {
lock->ls_seqid.counter = 0;
@ -906,6 +915,7 @@ static void nfs4_state_mark_reclaim(struct nfs4_client *clp)
lock->ls_flags &= ~NFS_LOCK_INITIALIZED;
}
}
spin_unlock(&sp->so_lock);
}
}