[PATCH] OCFS2: The Second Oracle Cluster Filesystem
The OCFS2 file system module. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
This commit is contained in:
Mark Fasheh
Joel Becker
248
fs/ocfs2/export.c
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248
fs/ocfs2/export.c
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@ -0,0 +1,248 @@
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/* -*- 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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#define MLOG_MASK_PREFIX ML_EXPORT
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "dir.h"
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#include "dlmglue.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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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, void *vobjp)
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{
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struct ocfs2_inode_handle *handle = vobjp;
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struct inode *inode;
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struct dentry *result;
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mlog_entry("(0x%p, 0x%p)\n", sb, handle);
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if (handle->ih_blkno == 0) {
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mlog_errno(-ESTALE);
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return ERR_PTR(-ESTALE);
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}
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inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno);
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if (IS_ERR(inode)) {
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mlog_errno(PTR_ERR(inode));
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return (void *)inode;
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}
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if (handle->ih_generation != inode->i_generation) {
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iput(inode);
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mlog_errno(-ESTALE);
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return ERR_PTR(-ESTALE);
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}
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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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mlog_errno(-ENOMEM);
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return ERR_PTR(-ENOMEM);
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}
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mlog_exit_ptr(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 *inode;
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struct inode *dir = child->d_inode;
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struct buffer_head *dirent_bh = NULL;
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struct ocfs2_dir_entry *dirent;
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mlog_entry("(0x%p, '%.*s')\n", child,
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child->d_name.len, child->d_name.name);
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mlog(0, "find parent of directory %"MLFu64"\n",
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OCFS2_I(dir)->ip_blkno);
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status = ocfs2_meta_lock(dir, NULL, 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 bail;
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}
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status = ocfs2_find_files_on_disk("..", 2, &blkno, dir, &dirent_bh,
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&dirent);
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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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inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno);
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if (IS_ERR(inode)) {
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mlog(ML_ERROR, "Unable to create inode %"MLFu64"\n", blkno);
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parent = ERR_PTR(-EACCES);
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goto bail_unlock;
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}
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parent = d_alloc_anon(inode);
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if (!parent) {
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iput(inode);
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parent = ERR_PTR(-ENOMEM);
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}
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bail_unlock:
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ocfs2_meta_unlock(dir, 0);
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if (dirent_bh)
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brelse(dirent_bh);
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bail:
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mlog_exit_ptr(parent);
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return parent;
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}
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static int ocfs2_encode_fh(struct dentry *dentry, __be32 *fh, 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 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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mlog_entry("(0x%p, '%.*s', 0x%p, %d, %d)\n", dentry,
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dentry->d_name.len, dentry->d_name.name,
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fh, len, connectable);
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if (len < 3 || (connectable && len < 6)) {
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mlog(ML_ERROR, "fh buffer is too small for encoding\n");
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type = 255;
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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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mlog(0, "Encoding fh: blkno: %"MLFu64", generation: %u\n",
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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 (connectable && !S_ISDIR(inode->i_mode)) {
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struct inode *parent;
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spin_lock(&dentry->d_lock);
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parent = dentry->d_parent->d_inode;
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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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spin_unlock(&dentry->d_lock);
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len = 6;
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type = 2;
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mlog(0, "Encoding parent: blkno: %"MLFu64", generation: %u\n",
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blkno, generation);
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}
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*max_len = len;
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bail:
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mlog_exit(type);
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return type;
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}
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static struct dentry *ocfs2_decode_fh(struct super_block *sb, __be32 *fh,
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int fh_len, int fileid_type,
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int (*acceptable)(void *context,
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struct dentry *de),
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void *context)
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{
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struct ocfs2_inode_handle handle, parent;
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struct dentry *ret = NULL;
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mlog_entry("(0x%p, 0x%p, %d, %d, 0x%p, 0x%p)\n",
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sb, fh, fh_len, fileid_type, acceptable, context);
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if (fh_len < 3 || fileid_type > 2)
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goto bail;
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if (fileid_type == 2) {
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if (fh_len < 6)
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goto bail;
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parent.ih_blkno = (u64)le32_to_cpu(fh[3]) << 32;
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parent.ih_blkno |= (u64)le32_to_cpu(fh[4]);
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parent.ih_generation = le32_to_cpu(fh[5]);
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mlog(0, "Decoding parent: blkno: %"MLFu64", generation: %u\n",
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parent.ih_blkno, parent.ih_generation);
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}
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handle.ih_blkno = (u64)le32_to_cpu(fh[0]) << 32;
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handle.ih_blkno |= (u64)le32_to_cpu(fh[1]);
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handle.ih_generation = le32_to_cpu(fh[2]);
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mlog(0, "Encoding fh: blkno: %"MLFu64", generation: %u\n",
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handle.ih_blkno, handle.ih_generation);
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ret = ocfs2_export_ops.find_exported_dentry(sb, &handle, &parent,
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acceptable, context);
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bail:
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mlog_exit_ptr(ret);
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return ret;
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}
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struct export_operations ocfs2_export_ops = {
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.decode_fh = ocfs2_decode_fh,
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.encode_fh = ocfs2_encode_fh,
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.get_parent = ocfs2_get_parent,
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.get_dentry = ocfs2_get_dentry,
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};
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