241 строка
6.2 KiB
C
241 строка
6.2 KiB
C
/*
|
|
* Copyright (c) 2004-2005 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms 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. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "xfs.h"
|
|
#include "xfs_types.h"
|
|
#include "xfs_inum.h"
|
|
#include "xfs_log.h"
|
|
#include "xfs_trans.h"
|
|
#include "xfs_sb.h"
|
|
#include "xfs_ag.h"
|
|
#include "xfs_dir2.h"
|
|
#include "xfs_mount.h"
|
|
#include "xfs_export.h"
|
|
#include "xfs_vnodeops.h"
|
|
#include "xfs_bmap_btree.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_inode_item.h"
|
|
#include "xfs_trace.h"
|
|
|
|
/*
|
|
* Note that we only accept fileids which are long enough rather than allow
|
|
* the parent generation number to default to zero. XFS considers zero a
|
|
* valid generation number not an invalid/wildcard value.
|
|
*/
|
|
static int xfs_fileid_length(int fileid_type)
|
|
{
|
|
switch (fileid_type) {
|
|
case FILEID_INO32_GEN:
|
|
return 2;
|
|
case FILEID_INO32_GEN_PARENT:
|
|
return 4;
|
|
case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
|
|
return 3;
|
|
case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
|
|
return 6;
|
|
}
|
|
return 255; /* invalid */
|
|
}
|
|
|
|
STATIC int
|
|
xfs_fs_encode_fh(
|
|
struct dentry *dentry,
|
|
__u32 *fh,
|
|
int *max_len,
|
|
int connectable)
|
|
{
|
|
struct fid *fid = (struct fid *)fh;
|
|
struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fh;
|
|
struct inode *inode = dentry->d_inode;
|
|
int fileid_type;
|
|
int len;
|
|
|
|
/* Directories don't need their parent encoded, they have ".." */
|
|
if (S_ISDIR(inode->i_mode) || !connectable)
|
|
fileid_type = FILEID_INO32_GEN;
|
|
else
|
|
fileid_type = FILEID_INO32_GEN_PARENT;
|
|
|
|
/* filesystem may contain 64bit inode numbers */
|
|
if (!(XFS_M(inode->i_sb)->m_flags & XFS_MOUNT_SMALL_INUMS))
|
|
fileid_type |= XFS_FILEID_TYPE_64FLAG;
|
|
|
|
/*
|
|
* Only encode if there is enough space given. In practice
|
|
* this means we can't export a filesystem with 64bit inodes
|
|
* over NFSv2 with the subtree_check export option; the other
|
|
* seven combinations work. The real answer is "don't use v2".
|
|
*/
|
|
len = xfs_fileid_length(fileid_type);
|
|
if (*max_len < len)
|
|
return 255;
|
|
*max_len = len;
|
|
|
|
switch (fileid_type) {
|
|
case FILEID_INO32_GEN_PARENT:
|
|
spin_lock(&dentry->d_lock);
|
|
fid->i32.parent_ino = dentry->d_parent->d_inode->i_ino;
|
|
fid->i32.parent_gen = dentry->d_parent->d_inode->i_generation;
|
|
spin_unlock(&dentry->d_lock);
|
|
/*FALLTHRU*/
|
|
case FILEID_INO32_GEN:
|
|
fid->i32.ino = inode->i_ino;
|
|
fid->i32.gen = inode->i_generation;
|
|
break;
|
|
case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
|
|
spin_lock(&dentry->d_lock);
|
|
fid64->parent_ino = dentry->d_parent->d_inode->i_ino;
|
|
fid64->parent_gen = dentry->d_parent->d_inode->i_generation;
|
|
spin_unlock(&dentry->d_lock);
|
|
/*FALLTHRU*/
|
|
case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
|
|
fid64->ino = inode->i_ino;
|
|
fid64->gen = inode->i_generation;
|
|
break;
|
|
}
|
|
|
|
return fileid_type;
|
|
}
|
|
|
|
STATIC struct inode *
|
|
xfs_nfs_get_inode(
|
|
struct super_block *sb,
|
|
u64 ino,
|
|
u32 generation)
|
|
{
|
|
xfs_mount_t *mp = XFS_M(sb);
|
|
xfs_inode_t *ip;
|
|
int error;
|
|
|
|
/*
|
|
* NFS can sometimes send requests for ino 0. Fail them gracefully.
|
|
*/
|
|
if (ino == 0)
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
/*
|
|
* The XFS_IGET_UNTRUSTED means that an invalid inode number is just
|
|
* fine and not an indication of a corrupted filesystem as clients can
|
|
* send invalid file handles and we have to handle it gracefully..
|
|
*/
|
|
error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED, 0, &ip);
|
|
if (error) {
|
|
/*
|
|
* EINVAL means the inode cluster doesn't exist anymore.
|
|
* This implies the filehandle is stale, so we should
|
|
* translate it here.
|
|
* We don't use ESTALE directly down the chain to not
|
|
* confuse applications using bulkstat that expect EINVAL.
|
|
*/
|
|
if (error == EINVAL)
|
|
error = ESTALE;
|
|
return ERR_PTR(-error);
|
|
}
|
|
|
|
if (ip->i_d.di_gen != generation) {
|
|
IRELE(ip);
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
return VFS_I(ip);
|
|
}
|
|
|
|
STATIC struct dentry *
|
|
xfs_fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fileid_type)
|
|
{
|
|
struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
|
|
struct inode *inode = NULL;
|
|
|
|
if (fh_len < xfs_fileid_length(fileid_type))
|
|
return NULL;
|
|
|
|
switch (fileid_type) {
|
|
case FILEID_INO32_GEN_PARENT:
|
|
case FILEID_INO32_GEN:
|
|
inode = xfs_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen);
|
|
break;
|
|
case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
|
|
case FILEID_INO32_GEN | XFS_FILEID_TYPE_64FLAG:
|
|
inode = xfs_nfs_get_inode(sb, fid64->ino, fid64->gen);
|
|
break;
|
|
}
|
|
|
|
return d_obtain_alias(inode);
|
|
}
|
|
|
|
STATIC struct dentry *
|
|
xfs_fs_fh_to_parent(struct super_block *sb, struct fid *fid,
|
|
int fh_len, int fileid_type)
|
|
{
|
|
struct xfs_fid64 *fid64 = (struct xfs_fid64 *)fid;
|
|
struct inode *inode = NULL;
|
|
|
|
switch (fileid_type) {
|
|
case FILEID_INO32_GEN_PARENT:
|
|
inode = xfs_nfs_get_inode(sb, fid->i32.parent_ino,
|
|
fid->i32.parent_gen);
|
|
break;
|
|
case FILEID_INO32_GEN_PARENT | XFS_FILEID_TYPE_64FLAG:
|
|
inode = xfs_nfs_get_inode(sb, fid64->parent_ino,
|
|
fid64->parent_gen);
|
|
break;
|
|
}
|
|
|
|
return d_obtain_alias(inode);
|
|
}
|
|
|
|
STATIC struct dentry *
|
|
xfs_fs_get_parent(
|
|
struct dentry *child)
|
|
{
|
|
int error;
|
|
struct xfs_inode *cip;
|
|
|
|
error = xfs_lookup(XFS_I(child->d_inode), &xfs_name_dotdot, &cip, NULL);
|
|
if (unlikely(error))
|
|
return ERR_PTR(-error);
|
|
|
|
return d_obtain_alias(VFS_I(cip));
|
|
}
|
|
|
|
STATIC int
|
|
xfs_fs_nfs_commit_metadata(
|
|
struct inode *inode)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int error = 0;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
if (xfs_ipincount(ip)) {
|
|
error = _xfs_log_force_lsn(mp, ip->i_itemp->ili_last_lsn,
|
|
XFS_LOG_SYNC, NULL);
|
|
}
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
|
|
return error;
|
|
}
|
|
|
|
const struct export_operations xfs_export_operations = {
|
|
.encode_fh = xfs_fs_encode_fh,
|
|
.fh_to_dentry = xfs_fs_fh_to_dentry,
|
|
.fh_to_parent = xfs_fs_fh_to_parent,
|
|
.get_parent = xfs_fs_get_parent,
|
|
.commit_metadata = xfs_fs_nfs_commit_metadata,
|
|
};
|