| 1 | // SPDX-License-Identifier: LGPL-2.1 |
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| 2 | /* |
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| 3 | * |
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| 4 | * Copyright (C) International Business Machines Corp., 2007 |
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| 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
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| 6 | * |
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| 7 | * Common Internet FileSystem (CIFS) client |
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| 8 | * |
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| 9 | * Operations related to support for exporting files via NFSD |
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| 10 | * |
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| 11 | */ |
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| 12 | |
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| 13 | /* |
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| 14 | * See Documentation/filesystems/nfs/exporting.rst |
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| 15 | * and examples in fs/exportfs |
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| 16 | * |
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| 17 | * Since cifs is a network file system, an "fsid" must be included for |
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| 18 | * any nfs exports file entries which refer to cifs paths. In addition |
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| 19 | * the cifs mount must be mounted with the "serverino" option (ie use stable |
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| 20 | * server inode numbers instead of locally generated temporary ones). |
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| 21 | * Although cifs inodes do not use generation numbers (have generation number |
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| 22 | * of zero) - the inode number alone should be good enough for simple cases |
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| 23 | * in which users want to export cifs shares with NFS. The decode and encode |
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| 24 | * could be improved by using a new routine which expects 64 bit inode numbers |
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| 25 | * instead of the default 32 bit routines in fs/exportfs |
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| 26 | * |
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| 27 | */ |
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| 28 | |
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| 29 | #include <linux/fs.h> |
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| 30 | #include <linux/exportfs.h> |
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| 31 | #include "cifsglob.h" |
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| 32 | #include "cifs_debug.h" |
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| 33 | #include "cifsfs.h" |
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| 34 | |
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| 35 | #ifdef CONFIG_CIFS_NFSD_EXPORT |
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| 36 | static struct dentry *cifs_get_parent(struct dentry *dentry) |
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| 37 | { |
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| 38 | /* BB need to add code here eventually to enable export via NFSD */ |
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| 39 | cifs_dbg(FYI, "get parent for %p\n" , dentry); |
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| 40 | return ERR_PTR(-EACCES); |
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| 41 | } |
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| 42 | |
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| 43 | const struct export_operations cifs_export_ops = { |
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| 44 | .encode_fh = generic_encode_ino32_fh, |
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| 45 | .get_parent = cifs_get_parent, |
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| 46 | /* |
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| 47 | * Following export operations are mandatory for NFS export support: |
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| 48 | * .fh_to_dentry = |
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| 49 | */ |
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| 50 | }; |
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| 51 | |
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| 52 | #endif /* CONFIG_CIFS_NFSD_EXPORT */ |
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| 53 | |
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| 54 | |
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