300 lines
6.8 KiB
C
300 lines
6.8 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* export.c
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*
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* Functions to facilitate NFS exporting
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*
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* Copyright (C) 2002, 2005 Oracle. 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
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will 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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "dir.h"
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#include "dlmglue.h"
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#include "dcache.h"
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#include "export.h"
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#include "inode.h"
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#include "buffer_head_io.h"
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#include "suballoc.h"
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#include "ocfs2_trace.h"
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struct ocfs2_inode_handle
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{
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u64 ih_blkno;
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u32 ih_generation;
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};
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static struct dentry *ocfs2_get_dentry(struct super_block *sb,
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struct ocfs2_inode_handle *handle)
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{
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struct inode *inode;
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struct ocfs2_super *osb = OCFS2_SB(sb);
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u64 blkno = handle->ih_blkno;
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int status, set;
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struct dentry *result;
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trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno);
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if (blkno == 0) {
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result = ERR_PTR(-ESTALE);
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goto bail;
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}
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inode = ocfs2_ilookup(sb, blkno);
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/*
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* If the inode exists in memory, we only need to check it's
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* generation number
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*/
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if (inode)
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goto check_gen;
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/*
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* This will synchronize us against ocfs2_delete_inode() on
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* all nodes
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*/
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status = ocfs2_nfs_sync_lock(osb, 1);
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if (status < 0) {
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mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
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goto check_err;
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}
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status = ocfs2_test_inode_bit(osb, blkno, &set);
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if (status < 0) {
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if (status == -EINVAL) {
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/*
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* The blkno NFS gave us doesn't even show up
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* as an inode, we return -ESTALE to be
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* nice
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*/
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status = -ESTALE;
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} else
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mlog(ML_ERROR, "test inode bit failed %d\n", status);
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goto unlock_nfs_sync;
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}
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trace_ocfs2_get_dentry_test_bit(status, set);
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/* If the inode allocator bit is clear, this inode must be stale */
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if (!set) {
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status = -ESTALE;
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goto unlock_nfs_sync;
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}
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inode = ocfs2_iget(osb, blkno, 0, 0);
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unlock_nfs_sync:
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ocfs2_nfs_sync_unlock(osb, 1);
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check_err:
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if (status < 0) {
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if (status == -ESTALE) {
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trace_ocfs2_get_dentry_stale((unsigned long long)blkno,
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handle->ih_generation);
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}
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result = ERR_PTR(status);
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goto bail;
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}
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if (IS_ERR(inode)) {
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mlog_errno(PTR_ERR(inode));
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result = ERR_CAST(inode);
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goto bail;
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}
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check_gen:
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if (handle->ih_generation != inode->i_generation) {
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trace_ocfs2_get_dentry_generation((unsigned long long)blkno,
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handle->ih_generation,
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inode->i_generation);
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iput(inode);
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result = ERR_PTR(-ESTALE);
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goto bail;
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}
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result = d_obtain_alias(inode);
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if (IS_ERR(result))
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mlog_errno(PTR_ERR(result));
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bail:
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trace_ocfs2_get_dentry_end(result);
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return result;
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}
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static struct dentry *ocfs2_get_parent(struct dentry *child)
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{
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int status;
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u64 blkno;
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struct dentry *parent;
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struct inode *dir = d_inode(child);
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int set;
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trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name,
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(unsigned long long)OCFS2_I(dir)->ip_blkno);
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status = ocfs2_nfs_sync_lock(OCFS2_SB(dir->i_sb), 1);
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if (status < 0) {
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mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status);
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parent = ERR_PTR(status);
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goto bail;
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}
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status = ocfs2_inode_lock(dir, NULL, 0);
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if (status < 0) {
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if (status != -ENOENT)
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mlog_errno(status);
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parent = ERR_PTR(status);
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goto unlock_nfs_sync;
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}
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status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno);
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if (status < 0) {
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parent = ERR_PTR(-ENOENT);
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goto bail_unlock;
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}
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status = ocfs2_test_inode_bit(OCFS2_SB(dir->i_sb), blkno, &set);
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if (status < 0) {
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if (status == -EINVAL) {
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status = -ESTALE;
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} else
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mlog(ML_ERROR, "test inode bit failed %d\n", status);
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parent = ERR_PTR(status);
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goto bail_unlock;
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}
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trace_ocfs2_get_dentry_test_bit(status, set);
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if (!set) {
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status = -ESTALE;
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parent = ERR_PTR(status);
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goto bail_unlock;
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}
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parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0));
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bail_unlock:
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ocfs2_inode_unlock(dir, 0);
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unlock_nfs_sync:
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ocfs2_nfs_sync_unlock(OCFS2_SB(dir->i_sb), 1);
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bail:
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trace_ocfs2_get_parent_end(parent);
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return parent;
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}
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static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len,
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struct inode *parent)
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{
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int len = *max_len;
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int type = 1;
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u64 blkno;
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u32 generation;
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__le32 *fh = (__force __le32 *) fh_in;
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#ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION
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#error "You go ahead and fix that mess, then. Somehow"
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trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len,
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dentry->d_name.name,
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fh, len, connectable);
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#endif
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if (parent && (len < 6)) {
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*max_len = 6;
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type = FILEID_INVALID;
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goto bail;
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} else if (len < 3) {
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*max_len = 3;
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type = FILEID_INVALID;
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goto bail;
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}
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blkno = OCFS2_I(inode)->ip_blkno;
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generation = inode->i_generation;
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trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation);
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len = 3;
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fh[0] = cpu_to_le32((u32)(blkno >> 32));
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fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff));
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fh[2] = cpu_to_le32(generation);
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if (parent) {
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blkno = OCFS2_I(parent)->ip_blkno;
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generation = parent->i_generation;
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fh[3] = cpu_to_le32((u32)(blkno >> 32));
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fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff));
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fh[5] = cpu_to_le32(generation);
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len = 6;
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type = 2;
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trace_ocfs2_encode_fh_parent((unsigned long long)blkno,
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generation);
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}
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*max_len = len;
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bail:
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trace_ocfs2_encode_fh_type(type);
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return type;
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}
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static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type)
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{
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struct ocfs2_inode_handle handle;
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if (fh_len < 3 || fh_type > 2)
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return NULL;
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handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32;
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handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]);
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handle.ih_generation = le32_to_cpu(fid->raw[2]);
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return ocfs2_get_dentry(sb, &handle);
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}
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static struct dentry *ocfs2_fh_to_parent(struct super_block *sb,
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struct fid *fid, int fh_len, int fh_type)
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{
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struct ocfs2_inode_handle parent;
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if (fh_type != 2 || fh_len < 6)
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return NULL;
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parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32;
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parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]);
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parent.ih_generation = le32_to_cpu(fid->raw[5]);
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return ocfs2_get_dentry(sb, &parent);
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}
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const struct export_operations ocfs2_export_ops = {
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.encode_fh = ocfs2_encode_fh,
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.fh_to_dentry = ocfs2_fh_to_dentry,
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.fh_to_parent = ocfs2_fh_to_parent,
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.get_parent = ocfs2_get_parent,
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};
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