projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 7b718769 NS |
2 | * Copyright (c) 2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. | |
| 1da177e4 | 4 | * |
| 7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as | |
| 1da177e4 LT |
7 | * published by the Free Software Foundation. |
| 8 | * | |
| 7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 1da177e4 | 13 | * |
| 7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, | |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 1da177e4 LT |
17 | */ |
| 18 | #ifndef __XFS_EXPORT_H__ | |
| 19 | #define __XFS_EXPORT_H__ | |
| 20 | ||
| 21 | /* | |
| 22 | * Common defines for code related to exporting XFS filesystems over NFS. | |
| 23 | * | |
| 24 | * The NFS fileid goes out on the wire as an array of | |
| 25 | * 32bit unsigned ints in host order. There are 5 possible | |
| 26 | * formats. | |
| 27 | * | |
| 28 | * (1) fileid_type=0x00 | |
| 29 | * (no fileid data; handled by the generic code) | |
| 30 | * | |
| 31 | * (2) fileid_type=0x01 | |
| 32 | * inode-num | |
| 33 | * generation | |
| 34 | * | |
| 35 | * (3) fileid_type=0x02 | |
| 36 | * inode-num | |
| 37 | * generation | |
| 38 | * parent-inode-num | |
| 39 | * parent-generation | |
| 40 | * | |
| 41 | * (4) fileid_type=0x81 | |
| 42 | * inode-num-lo32 | |
| 43 | * inode-num-hi32 | |
| 44 | * generation | |
| 45 | * | |
| 46 | * (5) fileid_type=0x82 | |
| 47 | * inode-num-lo32 | |
| 48 | * inode-num-hi32 | |
| 49 | * generation | |
| 50 | * parent-inode-num-lo32 | |
| 51 | * parent-inode-num-hi32 | |
| 52 | * parent-generation | |
| 53 | * | |
| 54 | * Note, the NFS filehandle also includes an fsid portion which | |
| 55 | * may have an inode number in it. That number is hardcoded to | |
| 56 | * 32bits and there is no way for XFS to intercept it. In | |
| 57 | * practice this means when exporting an XFS filesytem with 64bit | |
| 58 | * inodes you should either export the mountpoint (rather than | |
| 59 | * a subdirectory) or use the "fsid" export option. | |
| 60 | */ | |
| 61 | ||
| 62 | /* This flag goes on the wire. Don't play with it. */ | |
| 63 | #define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ | |
| 64 | ||
| 65 | /* Calculate the length in u32 units of the fileid data */ | |
| 66 | static inline int | |
| 67 | xfs_fileid_length(int hasparent, int is64) | |
| 68 | { | |
| 69 | return hasparent ? (is64 ? 6 : 4) : (is64 ? 3 : 2); | |
| 70 | } | |
| 71 | ||
| 72 | /* | |
| 73 | * Decode encoded inode information (either for the inode itself | |
| 74 | * or the parent) into an xfs_fid2_t structure. Advances and | |
| 75 | * returns the new data pointer | |
| 76 | */ | |
| 77 | static inline __u32 * | |
| 78 | xfs_fileid_decode_fid2(__u32 *p, xfs_fid2_t *fid, int is64) | |
| 79 | { | |
| 80 | fid->fid_len = sizeof(xfs_fid2_t) - sizeof(fid->fid_len); | |
| 81 | fid->fid_pad = 0; | |
| 82 | fid->fid_ino = *p++; | |
| 83 | #if XFS_BIG_INUMS | |
| 84 | if (is64) | |
| 85 | fid->fid_ino |= (((__u64)(*p++)) << 32); | |
| 86 | #endif | |
| 87 | fid->fid_gen = *p++; | |
| 88 | return p; | |
| 89 | } | |
| 90 | ||
| 91 | /* | |
| 92 | * Encode inode information (either for the inode itself or the | |
| 93 | * parent) into a fileid buffer. Advances and returns the new | |
| 94 | * data pointer. | |
| 95 | */ | |
| 96 | static inline __u32 * | |
| 97 | xfs_fileid_encode_inode(__u32 *p, struct inode *inode, int is64) | |
| 98 | { | |
| 99 | *p++ = (__u32)inode->i_ino; | |
| 100 | #if XFS_BIG_INUMS | |
| 101 | if (is64) | |
| 102 | *p++ = (__u32)(inode->i_ino >> 32); | |
| 103 | #endif | |
| 104 | *p++ = inode->i_generation; | |
| 105 | return p; | |
| 106 | } | |
| 107 | ||
| 108 | #endif /* __XFS_EXPORT_H__ */ |