206 lines
5.3 KiB
C
206 lines
5.3 KiB
C
/*
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* Copyright (c) 2004-2005 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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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_dmapi.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_dir.h"
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#include "xfs_mount.h"
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#include "xfs_export.h"
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/*
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* XFS encode and decodes the fileid portion of NFS filehandles
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* itself instead of letting the generic NFS code do it. This
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* allows filesystems with 64 bit inode numbers to be exported.
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*
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* Note that a side effect is that xfs_vget() won't be passed a
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* zero inode/generation pair under normal circumstances. As
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* however a malicious client could send us such data, the check
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* remains in that code.
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*/
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STATIC struct dentry *
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linvfs_decode_fh(
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struct super_block *sb,
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__u32 *fh,
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int fh_len,
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int fileid_type,
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int (*acceptable)(
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void *context,
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struct dentry *de),
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void *context)
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{
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xfs_fid2_t ifid;
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xfs_fid2_t pfid;
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void *parent = NULL;
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int is64 = 0;
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__u32 *p = fh;
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#if XFS_BIG_INUMS
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is64 = (fileid_type & XFS_FILEID_TYPE_64FLAG);
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fileid_type &= ~XFS_FILEID_TYPE_64FLAG;
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#endif
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/*
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* Note that we only accept fileids which are long enough
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* rather than allow the parent generation number to default
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* to zero. XFS considers zero a valid generation number not
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* an invalid/wildcard value. There's little point printk'ing
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* a warning here as we don't have the client information
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* which would make such a warning useful.
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*/
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if (fileid_type > 2 ||
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fh_len < xfs_fileid_length((fileid_type == 2), is64))
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return NULL;
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p = xfs_fileid_decode_fid2(p, &ifid, is64);
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if (fileid_type == 2) {
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p = xfs_fileid_decode_fid2(p, &pfid, is64);
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parent = &pfid;
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}
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fh = (__u32 *)&ifid;
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return find_exported_dentry(sb, fh, parent, acceptable, context);
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}
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STATIC int
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linvfs_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 inode *inode = dentry->d_inode;
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int type = 1;
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__u32 *p = fh;
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int len;
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int is64 = 0;
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#if XFS_BIG_INUMS
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vfs_t *vfs = LINVFS_GET_VFS(inode->i_sb);
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xfs_mount_t *mp = XFS_VFSTOM(vfs);
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if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT)) {
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/* filesystem may contain 64bit inode numbers */
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is64 = XFS_FILEID_TYPE_64FLAG;
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}
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#endif
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/* Directories don't need their parent encoded, they have ".." */
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if (S_ISDIR(inode->i_mode))
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connectable = 0;
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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(connectable, is64);
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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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p = xfs_fileid_encode_inode(p, inode, is64);
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if (connectable) {
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spin_lock(&dentry->d_lock);
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p = xfs_fileid_encode_inode(p, dentry->d_parent->d_inode, is64);
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spin_unlock(&dentry->d_lock);
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type = 2;
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}
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BUG_ON((p - fh) != len);
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return type | is64;
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}
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STATIC struct dentry *
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linvfs_get_dentry(
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struct super_block *sb,
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void *data)
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{
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vnode_t *vp;
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struct inode *inode;
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struct dentry *result;
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vfs_t *vfsp = LINVFS_GET_VFS(sb);
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int error;
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VFS_VGET(vfsp, &vp, (fid_t *)data, error);
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if (error || vp == NULL)
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return ERR_PTR(-ESTALE) ;
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inode = LINVFS_GET_IP(vp);
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result = d_alloc_anon(inode);
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if (!result) {
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iput(inode);
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return ERR_PTR(-ENOMEM);
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}
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return result;
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}
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STATIC struct dentry *
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linvfs_get_parent(
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struct dentry *child)
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{
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int error;
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vnode_t *vp, *cvp;
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struct dentry *parent;
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struct dentry dotdot;
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dotdot.d_name.name = "..";
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dotdot.d_name.len = 2;
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dotdot.d_inode = NULL;
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cvp = NULL;
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vp = LINVFS_GET_VP(child->d_inode);
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VOP_LOOKUP(vp, &dotdot, &cvp, 0, NULL, NULL, error);
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if (unlikely(error))
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return ERR_PTR(-error);
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parent = d_alloc_anon(LINVFS_GET_IP(cvp));
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if (unlikely(!parent)) {
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VN_RELE(cvp);
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return ERR_PTR(-ENOMEM);
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}
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return parent;
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}
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struct export_operations linvfs_export_ops = {
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.decode_fh = linvfs_decode_fh,
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.encode_fh = linvfs_encode_fh,
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.get_parent = linvfs_get_parent,
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.get_dentry = linvfs_get_dentry,
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};
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