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NFSD: add support for lock conflict to courteous server

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This patch allows expired client with lock state to be in COURTESY
state. Lock conflict with COURTESY client is resolved by the fs/lock
code using the lm_lock_expirable and lm_expire_lock callback in the
struct lock_manager_operations.

If conflict client is in COURTESY state, set it to EXPIRABLE and
schedule the laundromat to run immediately to expire the client. The
callback lm_expire_lock waits for the laundromat to flush its work
queue before returning to caller.

Reviewed-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Dai Ngo 2022-05-02 14:19:26 -07:00 committed by Chuck Lever
parent 2443da2259
commit 27431affb0
1 changed files with 54 additions and 16 deletions
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70
fs/nfsd/nfs4state.c
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@ -5714,39 +5714,51 @@ static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
}
#endif
/* Check if any lock belonging to this lockowner has any blockers */
static bool
nfs4_has_any_locks(struct nfs4_client *clp)
nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
{
struct file_lock_context *ctx;
struct nfs4_ol_stateid *stp;
struct nfs4_file *nf;
list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
nf = stp->st_stid.sc_file;
ctx = nf->fi_inode->i_flctx;
if (!ctx)
continue;
if (locks_owner_has_blockers(ctx, lo))
return true;
}
return false;
}
static bool
nfs4_anylock_blockers(struct nfs4_client *clp)
{
int i;
struct nfs4_stateowner *so;
struct nfs4_lockowner *lo;
if (atomic_read(&clp->cl_delegs_in_recall))
return true;
spin_lock(&clp->cl_lock);
for (i = 0; i < OWNER_HASH_SIZE; i++) {
list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
so_strhash) {
if (so->so_is_open_owner)
continue;
spin_unlock(&clp->cl_lock);
return true;
lo = lockowner(so);
if (nfs4_lockowner_has_blockers(lo)) {
spin_unlock(&clp->cl_lock);
return true;
}
}
}
spin_unlock(&clp->cl_lock);
return false;
}
/*
* place holder for now, no check for lock blockers yet
*/
static bool
nfs4_anylock_blockers(struct nfs4_client *clp)
{
if (atomic_read(&clp->cl_delegs_in_recall) ||
!list_empty(&clp->async_copies) ||
nfs4_has_any_locks(clp))
return true;
return false;
}
static void
nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
struct laundry_time *lt)
@ -6711,6 +6723,29 @@ nfsd4_lm_put_owner(fl_owner_t owner)
nfs4_put_stateowner(&lo->lo_owner);
}
/* return pointer to struct nfs4_client if client is expirable */
static bool
nfsd4_lm_lock_expirable(struct file_lock *cfl)
{
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)cfl->fl_owner;
struct nfs4_client *clp = lo->lo_owner.so_client;
struct nfsd_net *nn;
if (try_to_expire_client(clp)) {
nn = net_generic(clp->net, nfsd_net_id);
mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
return true;
}
return false;
}
/* schedule laundromat to run immediately and wait for it to complete */
static void
nfsd4_lm_expire_lock(void)
{
flush_workqueue(laundry_wq);
}
static void
nfsd4_lm_notify(struct file_lock *fl)
{
@ -6737,9 +6772,12 @@ nfsd4_lm_notify(struct file_lock *fl)
}
static const struct lock_manager_operations nfsd_posix_mng_ops = {
.lm_mod_owner = THIS_MODULE,
.lm_notify = nfsd4_lm_notify,
.lm_get_owner = nfsd4_lm_get_owner,
.lm_put_owner = nfsd4_lm_put_owner,
.lm_lock_expirable = nfsd4_lm_lock_expirable,
.lm_expire_lock = nfsd4_lm_expire_lock,
};
static inline void