283 lines
6.5 KiB
C
283 lines
6.5 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
|
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
|
*
|
|
* export.c
|
|
*
|
|
* Functions to facilitate NFS exporting
|
|
*
|
|
* Copyright (C) 2002, 2005 Oracle. 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; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will 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 to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/types.h>
|
|
|
|
#define MLOG_MASK_PREFIX ML_EXPORT
|
|
#include <cluster/masklog.h>
|
|
|
|
#include "ocfs2.h"
|
|
|
|
#include "alloc.h"
|
|
#include "dir.h"
|
|
#include "dlmglue.h"
|
|
#include "dcache.h"
|
|
#include "export.h"
|
|
#include "inode.h"
|
|
|
|
#include "buffer_head_io.h"
|
|
#include "suballoc.h"
|
|
|
|
struct ocfs2_inode_handle
|
|
{
|
|
u64 ih_blkno;
|
|
u32 ih_generation;
|
|
};
|
|
|
|
static struct dentry *ocfs2_get_dentry(struct super_block *sb,
|
|
struct ocfs2_inode_handle *handle)
|
|
{
|
|
struct inode *inode;
|
|
struct ocfs2_super *osb = OCFS2_SB(sb);
|
|
u64 blkno = handle->ih_blkno;
|
|
int status, set;
|
|
struct dentry *result;
|
|
|
|
mlog_entry("(0x%p, 0x%p)\n", sb, handle);
|
|
|
|
if (blkno == 0) {
|
|
mlog(0, "nfs wants inode with blkno: 0\n");
|
|
result = ERR_PTR(-ESTALE);
|
|
goto bail;
|
|
}
|
|
|
|
inode = ocfs2_ilookup(sb, blkno);
|
|
/*
|
|
* If the inode exists in memory, we only need to check it's
|
|
* generation number
|
|
*/
|
|
if (inode)
|
|
goto check_gen;
|
|
|
|
/*
|
|
* This will synchronize us against ocfs2_delete_inode() on
|
|
* all nodes
|
|
*/
|
|
status = ocfs2_nfs_sync_lock(osb, 1);
|
|
if (status < 0) {
|
|
mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
|
|
goto check_err;
|
|
}
|
|
|
|
status = ocfs2_test_inode_bit(osb, blkno, &set);
|
|
if (status < 0) {
|
|
if (status == -EINVAL) {
|
|
/*
|
|
* The blkno NFS gave us doesn't even show up
|
|
* as an inode, we return -ESTALE to be
|
|
* nice
|
|
*/
|
|
mlog(0, "test inode bit failed %d\n", status);
|
|
status = -ESTALE;
|
|
} else {
|
|
mlog(ML_ERROR, "test inode bit failed %d\n", status);
|
|
}
|
|
goto unlock_nfs_sync;
|
|
}
|
|
|
|
/* If the inode allocator bit is clear, this inode must be stale */
|
|
if (!set) {
|
|
mlog(0, "inode %llu suballoc bit is clear\n", blkno);
|
|
status = -ESTALE;
|
|
goto unlock_nfs_sync;
|
|
}
|
|
|
|
inode = ocfs2_iget(osb, blkno, 0, 0);
|
|
|
|
unlock_nfs_sync:
|
|
ocfs2_nfs_sync_unlock(osb, 1);
|
|
|
|
check_err:
|
|
if (status < 0) {
|
|
if (status == -ESTALE) {
|
|
mlog(0, "stale inode ino: %llu generation: %u\n",
|
|
blkno, handle->ih_generation);
|
|
}
|
|
result = ERR_PTR(status);
|
|
goto bail;
|
|
}
|
|
|
|
if (IS_ERR(inode)) {
|
|
mlog_errno(PTR_ERR(inode));
|
|
result = (void *)inode;
|
|
goto bail;
|
|
}
|
|
|
|
check_gen:
|
|
if (handle->ih_generation != inode->i_generation) {
|
|
iput(inode);
|
|
mlog(0, "stale inode ino: %llu generation: %u\n", blkno,
|
|
handle->ih_generation);
|
|
result = ERR_PTR(-ESTALE);
|
|
goto bail;
|
|
}
|
|
|
|
result = d_obtain_alias(inode);
|
|
if (!IS_ERR(result))
|
|
result->d_op = &ocfs2_dentry_ops;
|
|
else
|
|
mlog_errno(PTR_ERR(result));
|
|
|
|
bail:
|
|
mlog_exit_ptr(result);
|
|
return result;
|
|
}
|
|
|
|
static struct dentry *ocfs2_get_parent(struct dentry *child)
|
|
{
|
|
int status;
|
|
u64 blkno;
|
|
struct dentry *parent;
|
|
struct inode *dir = child->d_inode;
|
|
|
|
mlog_entry("(0x%p, '%.*s')\n", child,
|
|
child->d_name.len, child->d_name.name);
|
|
|
|
mlog(0, "find parent of directory %llu\n",
|
|
(unsigned long long)OCFS2_I(dir)->ip_blkno);
|
|
|
|
status = ocfs2_inode_lock(dir, NULL, 0);
|
|
if (status < 0) {
|
|
if (status != -ENOENT)
|
|
mlog_errno(status);
|
|
parent = ERR_PTR(status);
|
|
goto bail;
|
|
}
|
|
|
|
status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
|
|
if (status < 0) {
|
|
parent = ERR_PTR(-ENOENT);
|
|
goto bail_unlock;
|
|
}
|
|
|
|
parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
|
|
if (!IS_ERR(parent))
|
|
parent->d_op = &ocfs2_dentry_ops;
|
|
|
|
bail_unlock:
|
|
ocfs2_inode_unlock(dir, 0);
|
|
|
|
bail:
|
|
mlog_exit_ptr(parent);
|
|
|
|
return parent;
|
|
}
|
|
|
|
static int ocfs2_encode_fh(struct dentry *dentry, u32 *fh_in, int *max_len,
|
|
int connectable)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int len = *max_len;
|
|
int type = 1;
|
|
u64 blkno;
|
|
u32 generation;
|
|
__le32 *fh = (__force __le32 *) fh_in;
|
|
|
|
mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry,
|
|
dentry->d_name.len, dentry->d_name.name,
|
|
fh, len, connectable);
|
|
|
|
if (len < 3 || (connectable && len < 6)) {
|
|
mlog(ML_ERROR, "fh buffer is too small for encoding\n");
|
|
type = 255;
|
|
goto bail;
|
|
}
|
|
|
|
blkno = OCFS2_I(inode)->ip_blkno;
|
|
generation = inode->i_generation;
|
|
|
|
mlog(0, "Encoding fh: blkno: %llu, generation: %u\n",
|
|
(unsigned long long)blkno, generation);
|
|
|
|
len = 3;
|
|
fh[0] = cpu_to_le32((u32)(blkno >> 32));
|
|
fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
|
|
fh[2] = cpu_to_le32(generation);
|
|
|
|
if (connectable && !S_ISDIR(inode->i_mode)) {
|
|
struct inode *parent;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
|
|
parent = dentry->d_parent->d_inode;
|
|
blkno = OCFS2_I(parent)->ip_blkno;
|
|
generation = parent->i_generation;
|
|
|
|
fh[3] = cpu_to_le32((u32)(blkno >> 32));
|
|
fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
|
|
fh[5] = cpu_to_le32(generation);
|
|
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
len = 6;
|
|
type = 2;
|
|
|
|
mlog(0, "Encoding parent: blkno: %llu, generation: %u\n",
|
|
(unsigned long long)blkno, generation);
|
|
}
|
|
|
|
*max_len = len;
|
|
|
|
bail:
|
|
mlog_exit(type);
|
|
return type;
|
|
}
|
|
|
|
static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
struct ocfs2_inode_handle handle;
|
|
|
|
if (fh_len < 3 || fh_type > 2)
|
|
return NULL;
|
|
|
|
handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
|
|
handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
|
|
handle.ih_generation = le32_to_cpu(fid->raw[2]);
|
|
return ocfs2_get_dentry(sb, &handle);
|
|
}
|
|
|
|
static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
struct ocfs2_inode_handle parent;
|
|
|
|
if (fh_type != 2 || fh_len < 6)
|
|
return NULL;
|
|
|
|
parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
|
|
parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
|
|
parent.ih_generation = le32_to_cpu(fid->raw[5]);
|
|
return ocfs2_get_dentry(sb, &parent);
|
|
}
|
|
|
|
const struct export_operations ocfs2_export_ops = {
|
|
.encode_fh = ocfs2_encode_fh,
|
|
.fh_to_dentry = ocfs2_fh_to_dentry,
|
|
.fh_to_parent = ocfs2_fh_to_parent,
|
|
.get_parent = ocfs2_get_parent,
|
|
};
|