| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * Copyright (c) 2005 Silicon Graphics, Inc. |
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| 4 | * All Rights Reserved. |
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| 5 | */ |
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| 6 | #ifndef __XFS_EXPORT_H__ |
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| 7 | #define __XFS_EXPORT_H__ |
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| 8 | |
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| 9 | /* |
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| 10 | * Common defines for code related to exporting XFS filesystems over NFS. |
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| 11 | * |
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| 12 | * The NFS fileid goes out on the wire as an array of |
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| 13 | * 32bit unsigned ints in host order. There are 5 possible |
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| 14 | * formats. |
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| 15 | * |
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| 16 | * (1) fileid_type=0x00 |
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| 17 | * (no fileid data; handled by the generic code) |
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| 18 | * |
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| 19 | * (2) fileid_type=0x01 |
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| 20 | * inode-num |
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| 21 | * generation |
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| 22 | * |
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| 23 | * (3) fileid_type=0x02 |
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| 24 | * inode-num |
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| 25 | * generation |
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| 26 | * parent-inode-num |
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| 27 | * parent-generation |
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| 28 | * |
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| 29 | * (4) fileid_type=0x81 |
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| 30 | * inode-num-lo32 |
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| 31 | * inode-num-hi32 |
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| 32 | * generation |
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| 33 | * |
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| 34 | * (5) fileid_type=0x82 |
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| 35 | * inode-num-lo32 |
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| 36 | * inode-num-hi32 |
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| 37 | * generation |
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| 38 | * parent-inode-num-lo32 |
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| 39 | * parent-inode-num-hi32 |
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| 40 | * parent-generation |
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| 41 | * |
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| 42 | * Note, the NFS filehandle also includes an fsid portion which |
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| 43 | * may have an inode number in it. That number is hardcoded to |
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| 44 | * 32bits and there is no way for XFS to intercept it. In |
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| 45 | * practice this means when exporting an XFS filesystem with 64bit |
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| 46 | * inodes you should either export the mountpoint (rather than |
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| 47 | * a subdirectory) or use the "fsid" export option. |
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| 48 | */ |
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| 49 | |
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| 50 | struct xfs_fid64 { |
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| 51 | u64 ino; |
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| 52 | u32 gen; |
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| 53 | u64 parent_ino; |
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| 54 | u32 parent_gen; |
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| 55 | } __attribute__((packed)); |
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| 56 | |
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| 57 | /* This flag goes on the wire. Don't play with it. */ |
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| 58 | #define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ |
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| 59 | |
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| 60 | #endif /* __XFS_EXPORT_H__ */ |
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| 61 | |
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