mirror of
https://github.com/torvalds/linux
synced 2024-07-21 10:41:44 +00:00
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>
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*/
|
|
#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 filesystem with 64bit
|
|
* inodes you should either export the mountpoint (rather than
|
|
* a subdirectory) or use the "fsid" export option.
|
|
*/
|
|
|
|
struct xfs_fid64 {
|
|
u64 ino;
|
|
u32 gen;
|
|
u64 parent_ino;
|
|
u32 parent_gen;
|
|
} __attribute__((packed));
|
|
|
|
/* This flag goes on the wire. Don't play with it. */
|
|
#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */
|
|
|
|
struct inode *xfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 gen);
|
|
|
|
#endif /* __XFS_EXPORT_H__ */
|