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Diffstat (limited to 'fs/xfs/linux-2.6/xfs_export.h')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_export.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_export.h b/fs/xfs/linux-2.6/xfs_export.h new file mode 100644 index 000000000000..60b2abac1c18 --- /dev/null +++ b/fs/xfs/linux-2.6/xfs_export.h @@ -0,0 +1,122 @@ +/* + * Copyright (c) 2005 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ +#ifndef __XFS_EXPORT_H__ +#define __XFS_EXPORT_H__ + +/* + * Common defines for code related to exporting XFS filesystems over NFS. + * + * The NFS fileid goes out on the wire as an array of + * 32bit unsigned ints in host order. There are 5 possible + * formats. + * + * (1) fileid_type=0x00 + * (no fileid data; handled by the generic code) + * + * (2) fileid_type=0x01 + * inode-num + * generation + * + * (3) fileid_type=0x02 + * inode-num + * generation + * parent-inode-num + * parent-generation + * + * (4) fileid_type=0x81 + * inode-num-lo32 + * inode-num-hi32 + * generation + * + * (5) fileid_type=0x82 + * inode-num-lo32 + * inode-num-hi32 + * generation + * parent-inode-num-lo32 + * parent-inode-num-hi32 + * parent-generation + * + * Note, the NFS filehandle also includes an fsid portion which + * may have an inode number in it. That number is hardcoded to + * 32bits and there is no way for XFS to intercept it. In + * practice this means when exporting an XFS filesytem with 64bit + * inodes you should either export the mountpoint (rather than + * a subdirectory) or use the "fsid" export option. + */ + +/* This flag goes on the wire. Don't play with it. */ +#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ + +/* Calculate the length in u32 units of the fileid data */ +static inline int +xfs_fileid_length(int hasparent, int is64) +{ + return hasparent ? (is64 ? 6 : 4) : (is64 ? 3 : 2); +} + +/* + * Decode encoded inode information (either for the inode itself + * or the parent) into an xfs_fid2_t structure. Advances and + * returns the new data pointer + */ +static inline __u32 * +xfs_fileid_decode_fid2(__u32 *p, xfs_fid2_t *fid, int is64) +{ + fid->fid_len = sizeof(xfs_fid2_t) - sizeof(fid->fid_len); + fid->fid_pad = 0; + fid->fid_ino = *p++; +#if XFS_BIG_INUMS + if (is64) + fid->fid_ino |= (((__u64)(*p++)) << 32); +#endif + fid->fid_gen = *p++; + return p; +} + +/* + * Encode inode information (either for the inode itself or the + * parent) into a fileid buffer. Advances and returns the new + * data pointer. + */ +static inline __u32 * +xfs_fileid_encode_inode(__u32 *p, struct inode *inode, int is64) +{ + *p++ = (__u32)inode->i_ino; +#if XFS_BIG_INUMS + if (is64) + *p++ = (__u32)(inode->i_ino >> 32); +#endif + *p++ = inode->i_generation; + return p; +} + +#endif /* __XFS_EXPORT_H__ */ |