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60 lines
1.4 KiB
60 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2005 Silicon Graphics, Inc. |
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* All Rights Reserved. |
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*/ |
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#ifndef __XFS_EXPORT_H__ |
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#define __XFS_EXPORT_H__ |
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/* |
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* Common defines for code related to exporting XFS filesystems over NFS. |
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* |
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* The NFS fileid goes out on the wire as an array of |
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* 32bit unsigned ints in host order. There are 5 possible |
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* formats. |
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* |
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* (1) fileid_type=0x00 |
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* (no fileid data; handled by the generic code) |
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* |
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* (2) fileid_type=0x01 |
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* inode-num |
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* generation |
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* |
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* (3) fileid_type=0x02 |
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* inode-num |
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* generation |
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* parent-inode-num |
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* parent-generation |
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* |
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* (4) fileid_type=0x81 |
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* inode-num-lo32 |
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* inode-num-hi32 |
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* generation |
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* |
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* (5) fileid_type=0x82 |
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* inode-num-lo32 |
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* inode-num-hi32 |
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* generation |
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* parent-inode-num-lo32 |
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* parent-inode-num-hi32 |
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* parent-generation |
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* |
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* Note, the NFS filehandle also includes an fsid portion which |
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* may have an inode number in it. That number is hardcoded to |
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* 32bits and there is no way for XFS to intercept it. In |
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* practice this means when exporting an XFS filesystem with 64bit |
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* inodes you should either export the mountpoint (rather than |
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* a subdirectory) or use the "fsid" export option. |
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*/ |
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struct xfs_fid64 { |
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u64 ino; |
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u32 gen; |
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u64 parent_ino; |
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u32 parent_gen; |
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} __attribute__((packed)); |
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/* This flag goes on the wire. Don't play with it. */ |
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#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ |
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#endif /* __XFS_EXPORT_H__ */
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