journal_xfs.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:4k
- /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
- *
- * Copyright (C) 1998 Peter J. Braam <braam@clusterfs.com>
- *
- * This file is part of InterMezzo, http://www.inter-mezzo.org.
- *
- * InterMezzo is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * InterMezzo 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 InterMezzo; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/fs.h>
- #include <linux/slab.h>
- #include <linux/vmalloc.h>
- #include <linux/stat.h>
- #include <linux/errno.h>
- #include <linux/locks.h>
- #include <asm/segment.h>
- #include <asm/uaccess.h>
- #include <linux/string.h>
- #if 0
- /* XFS Support not there yet */
- #ifdef CONFIG_FS_XFS
- #include <linux/xfs_fs.h>
- #endif
- #include <linux/intermezzo_fs.h>
- #include <linux/intermezzo_psdev.h>
- #include <linux/intermezzo_journal.h>
- #if 0
- /* XFS has journalling, but these functions do nothing yet... */
- static unsigned long presto_xfs_freespace(struct presto_file_set *fset,
- struct super_block *sb)
- {
- #if 0
- vfs_t *vfsp = LINVFS_GET_VFS(sb);
- struct statvfs_t stat;
- bhv_desc_t *bdp;
- unsigned long avail;
- int rc;
- VFS_STATVFS(vfsp, &stat, NULL, rc);
- avail = statp.f_bfree;
- return sbp->sb_fdblocks;;
- #endif
- return 0x0fffffff;
- }
- /* start the filesystem journal operations */
- static void *
- presto_xfs_trans_start(struct presto_file_set *fset,
- struct inode *inode, int op)
- {
- int xfs_op;
- /* do a free blocks check as in journal_ext3? does anything protect
- * the space in that case or can it disappear out from under us
- * anyway? */
-
- /* copied from xfs_trans.h, skipping header maze for now */
- #define XFS_TRANS_SETATTR_NOT_SIZE 1
- #define XFS_TRANS_SETATTR_SIZE 2
- #define XFS_TRANS_INACTIVE 3
- #define XFS_TRANS_CREATE 4
- #define XFS_TRANS_CREATE_TRUNC 5
- #define XFS_TRANS_TRUNCATE_FILE 6
- #define XFS_TRANS_REMOVE 7
- #define XFS_TRANS_LINK 8
- #define XFS_TRANS_RENAME 9
- #define XFS_TRANS_MKDIR 10
- #define XFS_TRANS_RMDIR 11
- #define XFS_TRANS_SYMLINK 12
- /* map the op onto the values for XFS so it can do reservation. if
- * we don't have enough info to differentiate between e.g. setattr
- * with or without size, what do we do? will it adjust? */
- switch (op) {
- case PRESTO_OP_SETATTR:
- /* or XFS_TRANS_SETATTR_NOT_SIZE? */
- xfs_op = XFS_TRANS_SETATTR_SIZE;
- break;
- case PRESTO_OP_CREATE:
- /* or CREATE_TRUNC? */
- xfs_op = XFS_TRANS_CREATE;
- break;
- case PRESTO_OP_LINK:
- xfs_op = XFS_TRANS_LINK;
- break;
- case PRESTO_OP_UNLINK:
- xfs_op = XFS_TRANS_REMOVE;
- break;
- case PRESTO_OP_SYMLINK:
- xfs_op = XFS_TRANS_SYMLINK;
- break;
- case PRESTO_OP_MKDIR:
- xfs_op = XFS_TRANS_MKDIR;
- break;
- case PRESTO_OP_RMDIR:
- xfs_op = XFS_TRANS_RMDIR;
- break;
- case PRESTO_OP_MKNOD:
- /* XXX can't find an analog for mknod? */
- xfs_op = XFS_TRANS_CREATE;
- break;
- case PRESTO_OP_RENAME:
- xfs_op = XFS_TRANS_RENAME;
- break;
- default:
- CDEBUG(D_JOURNAL, "invalid operation %d for journaln", op);
- return NULL;
- }
- return xfs_trans_start(inode, xfs_op);
- }
- static void presto_xfs_trans_commit(struct presto_file_set *fset, void *handle)
- {
- /* assert (handle == current->j_handle) */
- xfs_trans_stop(handle);
- }
- static void presto_xfs_journal_file_data(struct inode *inode)
- {
- return;
- }
- static int presto_xfs_has_all_data(struct inode *inode)
- {
- BUG();
- return 0;
- }
- struct journal_ops presto_xfs_journal_ops = {
- .tr_all_data = presto_xfs_has_all_data,
- .tr_avail = presto_xfs_freespace,
- .tr_start = presto_xfs_trans_start,
- .tr_commit = presto_xfs_trans_commit,
- .tr_journal_data = presto_xfs_journal_file_data
- };
- #endif
- #endif /* CONFIG_XFS_FS */