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NFS: Avoid unnecessary rescanning of the per-server delegation list

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[ Upstream commit f92214e4c3 ]

If the call to nfs_delegation_grab_inode() fails, we will not have
dropped any locks that require us to rescan the list.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2024-08-21 14:05:02 -04:00 committed by Greg Kroah-Hartman
parent d8a7055ffd
commit d07216aa30
1 changed files with 5 additions and 10 deletions
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15
fs/nfs/delegation.c
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@ -627,6 +627,9 @@ restart:
prev = delegation; prev = delegation;
continue; continue;
} }
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL)
continue;
if (prev) { if (prev) {
struct inode *tmp = nfs_delegation_grab_inode(prev); struct inode *tmp = nfs_delegation_grab_inode(prev);
@ -637,12 +640,6 @@ restart:
} }
} }
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL) {
rcu_read_unlock();
iput(to_put);
goto restart;
}
delegation = nfs_start_delegation_return_locked(NFS_I(inode)); delegation = nfs_start_delegation_return_locked(NFS_I(inode));
rcu_read_unlock(); rcu_read_unlock();
@ -1164,7 +1161,6 @@ static int nfs_server_reap_unclaimed_delegations(struct nfs_server *server,
struct inode *inode; struct inode *inode;
restart: restart:
rcu_read_lock(); rcu_read_lock();
restart_locked:
list_for_each_entry_rcu(delegation, &server->delegations, super_list) { list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
if (test_bit(NFS_DELEGATION_INODE_FREEING, if (test_bit(NFS_DELEGATION_INODE_FREEING,
&delegation->flags) || &delegation->flags) ||
@ -1175,7 +1171,7 @@ restart_locked:
continue; continue;
inode = nfs_delegation_grab_inode(delegation); inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL) if (inode == NULL)
goto restart_locked; continue;
delegation = nfs_start_delegation_return_locked(NFS_I(inode)); delegation = nfs_start_delegation_return_locked(NFS_I(inode));
rcu_read_unlock(); rcu_read_unlock();
if (delegation != NULL) { if (delegation != NULL) {
@ -1296,7 +1292,6 @@ static int nfs_server_reap_expired_delegations(struct nfs_server *server,
nfs4_stateid stateid; nfs4_stateid stateid;
restart: restart:
rcu_read_lock(); rcu_read_lock();
restart_locked:
list_for_each_entry_rcu(delegation, &server->delegations, super_list) { list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
if (test_bit(NFS_DELEGATION_INODE_FREEING, if (test_bit(NFS_DELEGATION_INODE_FREEING,
&delegation->flags) || &delegation->flags) ||
@ -1307,7 +1302,7 @@ restart_locked:
continue; continue;
inode = nfs_delegation_grab_inode(delegation); inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL) if (inode == NULL)
goto restart_locked; continue;
spin_lock(&delegation->lock); spin_lock(&delegation->lock);
cred = get_cred_rcu(delegation->cred); cred = get_cred_rcu(delegation->cred);
nfs4_stateid_copy(&stateid, &delegation->stateid); nfs4_stateid_copy(&stateid, &delegation->stateid);