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When NFSD_CMD_UNLOCK_EXPORT revokes NFSv4 state for an export path, GC-managed nfsd_file entries for files under that path may remain in the file cache. These cached handles hold the underlying filesystem busy, preventing a subsequent unmount. Add nfsd_file_close_export(), which walks the nfsd_file hash table and closes GC-eligible entries whose underlying file resides on the same filesystem and is a descendant of the export path. Because nfsd_file entries do not carry an export reference, the ancestry check uses is_subdir() on the file's dentry. False positives -- closing a cached handle that did not originate from the target export -- are harmless; the handle is simply reopened on the next access. The handler calls nfsd_file_close_export() before revoking NFSv4 state, mirroring the order used by NFSD_CMD_UNLOCK_FILESYSTEM (which cancels copies and releases NLM locks before revoking state). Both calls run under nfsd_mutex. Reviewed-by: Jeff Layton <jlayton@kernel.org> Tested-by: Dai Ngo <dai.ngo@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
1476 lines
40 KiB
1476 lines
40 KiB