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| author | Chuck Lever <chuck.lever@oracle.com> | 2026-04-19 21:53:06 +0300 |
|---|---|---|
| committer | Chuck Lever <cel@kernel.org> | 2026-06-09 23:32:59 +0300 |
| commit | 2eac189bb059d31a29937b29ee0f477394198610 (patch) | |
| tree | bde44a2d3750582f6c84bee20cd0429ded8aa80d /include/uapi/linux | |
| parent | ba0cde5dc81d214684b8ea0bd87414ba2f48fe02 (diff) | |
| download | linux-2eac189bb059d31a29937b29ee0f477394198610.tar.xz | |
NFSD: Add NFSD_CMD_UNLOCK_EXPORT netlink command
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>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/nfsd_netlink.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_netlink.h index d01096c06d72..f5b75d5caba9 100644 --- a/include/uapi/linux/nfsd_netlink.h +++ b/include/uapi/linux/nfsd_netlink.h @@ -219,6 +219,13 @@ enum { }; enum { + NFSD_A_UNLOCK_EXPORT_PATH = 1, + + __NFSD_A_UNLOCK_EXPORT_MAX, + NFSD_A_UNLOCK_EXPORT_MAX = (__NFSD_A_UNLOCK_EXPORT_MAX - 1) +}; + +enum { NFSD_CMD_RPC_STATUS_GET = 1, NFSD_CMD_THREADS_SET, NFSD_CMD_THREADS_GET, @@ -236,6 +243,7 @@ enum { NFSD_CMD_CACHE_FLUSH, NFSD_CMD_UNLOCK_IP, NFSD_CMD_UNLOCK_FILESYSTEM, + NFSD_CMD_UNLOCK_EXPORT, __NFSD_CMD_MAX, NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1) |