mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Chuck LeverandChuck Lever
2eac189bb0
When a filesystem is exported to NFS clients, NFSv4 state (opens, locks, delegations, layouts) holds references that prevent the underlying filesystem from being unmounted. NFSD_CMD_UNLOCK_FILESYSTEM addresses this at superblock granularity, but administrators unexporting a single path on a shared filesystem (e.g., one of several exports on the same device) need finer control. Add NFSD_CMD_UNLOCK_EXPORT, which revokes NFSv4 state acquired through exports of a specific path. Matching is by path identity (dentry + vfsmount) via the sc_export field on each nfs4_stid, so multiple svc_export objects for the same path -- one per auth_domain -- are handled correctly without requiring the caller to name a specific client. The command takes a single "path" attribute. Userspace (exportfs -u) sends this after removing the last client for a given path, enabling the underlying filesystem to be unmounted. When multiple clients share an export path, individual unexports do not trigger state revocation; only the final one does. Reviewed-by: Jeff Layton <jlayton@kernel.org> Tested-by: Dai Ngo <dai.ngo@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
54 lines
2.5 KiB
C
54 lines
2.5 KiB
C
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
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/* Do not edit directly, auto-generated from: */
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/* Documentation/netlink/specs/nfsd.yaml */
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/* YNL-GEN kernel header */
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/* To regenerate run: tools/net/ynl/ynl-regen.sh */
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#ifndef _LINUX_NFSD_GEN_H
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#define _LINUX_NFSD_GEN_H
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <uapi/linux/nfsd_netlink.h>
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/* Common nested types */
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extern const struct nla_policy nfsd_auth_flavor_nl_policy[NFSD_A_AUTH_FLAVOR_FLAGS + 1];
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extern const struct nla_policy nfsd_expkey_nl_policy[NFSD_A_EXPKEY_PATH + 1];
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extern const struct nla_policy nfsd_fslocation_nl_policy[NFSD_A_FSLOCATION_PATH + 1];
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extern const struct nla_policy nfsd_fslocations_nl_policy[NFSD_A_FSLOCATIONS_LOCATION + 1];
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extern const struct nla_policy nfsd_sock_nl_policy[NFSD_A_SOCK_TRANSPORT_NAME + 1];
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extern const struct nla_policy nfsd_svc_export_nl_policy[NFSD_A_SVC_EXPORT_FSID + 1];
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extern const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1];
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int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_svc_export_get_reqs_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int nfsd_nl_svc_export_set_reqs_doit(struct sk_buff *skb,
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struct genl_info *info);
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int nfsd_nl_expkey_get_reqs_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int nfsd_nl_expkey_set_reqs_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_cache_flush_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_unlock_ip_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_unlock_filesystem_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_unlock_export_doit(struct sk_buff *skb, struct genl_info *info);
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enum {
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NFSD_NLGRP_NONE,
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NFSD_NLGRP_EXPORTD,
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};
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extern struct genl_family nfsd_nl_family;
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#endif /* _LINUX_NFSD_GEN_H */
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