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NFSv4: Don't trigger uneccessary scans for return-on-close delegations

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The amount of looping through the list of delegations is occasionally
leading to soft lockups. Avoid at least some loops by not requiring the
NFSv4 state manager to scan for delegations that are marked for
return-on-close. Instead, either mark them for immediate return (if
possible) or else leave it up to nfs4_inode_return_delegation_on_close()
to return them once the file is closed by the application.

Fixes: b757144fd7 ("NFSv4: Be less aggressive about returning delegations for open files")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2025-02-18 16:50:30 -05:00
parent 4701f33a10
commit 47acca884f
1 changed files with 18 additions and 15 deletions
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33
fs/nfs/delegation.c
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@ -590,17 +590,6 @@ static bool nfs_delegation_need_return(struct nfs_delegation *delegation)
if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
ret = true;
else if (test_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags)) {
struct inode *inode;
spin_lock(&delegation->lock);
inode = delegation->inode;
if (inode && list_empty(&NFS_I(inode)->open_files))
ret = true;
spin_unlock(&delegation->lock);
}
if (ret)
clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags);
if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags) ||
test_bit(NFS_DELEGATION_RETURN_DELAYED, &delegation->flags) ||
test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
@ -878,11 +867,25 @@ int nfs4_inode_make_writeable(struct inode *inode)
return nfs4_inode_return_delegation(inode);
}
static void nfs_mark_return_if_closed_delegation(struct nfs_server *server,
struct nfs_delegation *delegation)
static void
nfs_mark_return_if_closed_delegation(struct nfs_server *server,
struct nfs_delegation *delegation)
{
set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags);
set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
struct inode *inode;
if (test_bit(NFS_DELEGATION_RETURN, &delegation->flags) ||
test_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags))
return;
spin_lock(&delegation->lock);
inode = delegation->inode;
if (!inode)
goto out;
if (list_empty(&NFS_I(inode)->open_files))
nfs_mark_return_delegation(server, delegation);
else
set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags);
out:
spin_unlock(&delegation->lock);
}
static bool nfs_server_mark_return_all_delegations(struct nfs_server *server)