576ecb8e2b
We now support mounting and using filesystems with 64-bit inodes even when not mounted with the inode64 option (which now only controls if we allocate new inodes in that space or not). Make sure we always use large NFS file handles when exporting a filesystem that may contain 64-bit inodes. Note that this only affects newly generated file handles, any outstanding 32-bit file handle is still accepted. [hch: the comment and commit log are mine, the rest is from a patch snipplet from Samuel] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
249 lines
6.6 KiB
C
249 lines
6.6 KiB
C
/*
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* Copyright (c) 2004-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_types.h"
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#include "xfs_inum.h"
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#include "xfs_log.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir2.h"
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#include "xfs_mount.h"
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#include "xfs_export.h"
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#include "xfs_vnodeops.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_trace.h"
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/*
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* Note that we only accept fileids which are long enough rather than allow
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* the parent generation number to default to zero. XFS considers zero a
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* valid generation number not an invalid/wildcard value.
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*/
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static int xfs_fileid_length(int fileid_type)
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{
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switch (fileid_type) {
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case FILEID_INO32_GEN:
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return 2;
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case FILEID_INO32_GEN_PARENT:
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return 4;
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case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
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return 3;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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return 6;
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}
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return 255; /* invalid */
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}
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STATIC int
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xfs_fs_encode_fh(
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struct dentry *dentry,
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__u32 *fh,
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int *max_len,
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int connectable)
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{
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struct fid *fid = (struct fid *)fh;
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struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
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struct inode *inode = dentry->d_inode;
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int fileid_type;
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int len;
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/* Directories don't need their parent encoded, they have ".." */
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if (S_ISDIR(inode->i_mode) || !connectable)
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fileid_type = FILEID_INO32_GEN;
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else
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fileid_type = FILEID_INO32_GEN_PARENT;
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/*
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* If the the filesystem may contain 64bit inode numbers, we need
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* to use larger file handles that can represent them.
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*
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* While we only allocate inodes that do not fit into 32 bits any
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* large enough filesystem may contain them, thus the slightly
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* confusing looking conditional below.
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*/
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if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS) ||
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(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_32BITINODES))
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fileid_type |= XFS_FILEID_TYPE_64FLAG;
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/*
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* Only encode if there is enough space given. In practice
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* this means we can't export a filesystem with 64bit inodes
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* over NFSv2 with the subtree_check export option; the other
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* seven combinations work. The real answer is "don't use v2".
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*/
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len = xfs_fileid_length(fileid_type);
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if (*max_len < len)
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return 255;
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*max_len = len;
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switch (fileid_type) {
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case FILEID_INO32_GEN_PARENT:
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spin_lock(&dentry->d_lock);
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fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino;
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fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
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spin_unlock(&dentry->d_lock);
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/*FALLTHRU*/
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case FILEID_INO32_GEN:
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fid->i32.ino = inode->i_ino;
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fid->i32.gen = inode->i_generation;
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break;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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spin_lock(&dentry->d_lock);
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fid64->parent_ino = dentry->d_parent->d_inode->i_ino;
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fid64->parent_gen = dentry->d_parent->d_inode->i_generation;
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spin_unlock(&dentry->d_lock);
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/*FALLTHRU*/
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case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
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fid64->ino = inode->i_ino;
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fid64->gen = inode->i_generation;
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break;
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}
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return fileid_type;
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}
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STATIC struct inode *
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xfs_nfs_get_inode(
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struct super_block *sb,
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u64 ino,
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u32 generation)
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{
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xfs_mount_t *mp = XFS_M(sb);
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xfs_inode_t *ip;
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int error;
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/*
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* NFS can sometimes send requests for ino 0. Fail them gracefully.
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*/
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if (ino == 0)
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return ERR_PTR(-ESTALE);
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/*
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* The XFS_IGET_UNTRUSTED means that an invalid inode number is just
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* fine and not an indication of a corrupted filesystem as clients can
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* send invalid file handles and we have to handle it gracefully..
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*/
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error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
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if (error) {
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/*
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* EINVAL means the inode cluster doesn't exist anymore.
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* This implies the filehandle is stale, so we should
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* translate it here.
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* We don't use ESTALE directly down the chain to not
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* confuse applications using bulkstat that expect EINVAL.
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*/
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if (error == EINVAL)
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error = ESTALE;
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return ERR_PTR(-error);
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}
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if (ip->i_d.di_gen != generation) {
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IRELE(ip);
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return ERR_PTR(-ENOENT);
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}
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return VFS_I(ip);
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}
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STATIC struct dentry *
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xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
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int fh_len, int fileid_type)
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{
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struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
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struct inode *inode = NULL;
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if (fh_len < xfs_fileid_length(fileid_type))
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return NULL;
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switch (fileid_type) {
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case FILEID_INO32_GEN_PARENT:
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case FILEID_INO32_GEN:
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inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
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break;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
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inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
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break;
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}
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return d_obtain_alias(inode);
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}
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STATIC struct dentry *
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xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
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int fh_len, int fileid_type)
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{
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struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
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struct inode *inode = NULL;
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switch (fileid_type) {
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case FILEID_INO32_GEN_PARENT:
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inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
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fid->i32.parent_gen);
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break;
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case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
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inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
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fid64->parent_gen);
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break;
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}
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return d_obtain_alias(inode);
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}
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STATIC struct dentry *
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xfs_fs_get_parent(
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struct dentry *child)
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{
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int error;
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struct xfs_inode *cip;
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error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
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if (unlikely(error))
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return ERR_PTR(-error);
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return d_obtain_alias(VFS_I(cip));
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}
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STATIC int
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xfs_fs_nfs_commit_metadata(
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struct inode *inode)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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int error = 0;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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if (xfs_ipincount(ip)) {
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error = _xfs_log_force_lsn(mp, ip->i_itemp->ili_last_lsn,
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XFS_LOG_SYNC, NULL);
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}
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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return error;
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}
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const struct export_operations xfs_export_operations = {
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.encode_fh = xfs_fs_encode_fh,
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.fh_to_dentry = xfs_fs_fh_to_dentry,
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.fh_to_parent = xfs_fs_fh_to_parent,
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.get_parent = xfs_fs_get_parent,
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.commit_metadata = xfs_fs_nfs_commit_metadata,
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};
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