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233f4e12bb
This patch adds a pair of new file ioctls to retrieve the parent pointer of a given inode. They both return the same results, but one operates on the file descriptor passed to ioctl() whereas the other allows the caller to specify a file handle for which the caller wants results. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
// 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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struct inode *xfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 gen);
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#endif /* __XFS_EXPORT_H__ */
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