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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [intermezzo/] [journal_ext2.c] - Rev 1765
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/* -*- 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> #include <linux/ext2_fs.h> #include <linux/intermezzo_fs.h> #include <linux/intermezzo_psdev.h> #if defined(CONFIG_EXT2_FS) /* EXT2 has no journalling, so these functions do nothing */ static loff_t presto_e2_freespace(struct presto_cache *cache, struct super_block *sb) { unsigned long freebl = le32_to_cpu(sb->u.ext2_sb.s_es->s_free_blocks_count); unsigned long avail = freebl - le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count); return (avail << EXT2_BLOCK_SIZE_BITS(sb)); } /* start the filesystem journal operations */ static void *presto_e2_trans_start(struct presto_file_set *fset, struct inode *inode, int op) { __u32 avail_kmlblocks; if ( presto_no_journal(fset) || strcmp(fset->fset_cache->cache_type, "ext2")) return NULL; avail_kmlblocks = inode->i_sb->u.ext2_sb.s_es->s_free_blocks_count; if ( avail_kmlblocks < 3 ) { return ERR_PTR(-ENOSPC); } if ( (op != KML_OPCODE_UNLINK && op != KML_OPCODE_RMDIR) && avail_kmlblocks < 6 ) { return ERR_PTR(-ENOSPC); } return (void *) 1; } static void presto_e2_trans_commit(struct presto_file_set *fset, void *handle) { do {} while (0); } static int presto_e2_has_all_data(struct inode *inode) { BUG(); return 0; } struct journal_ops presto_ext2_journal_ops = { tr_all_data: presto_e2_has_all_data, tr_avail: presto_e2_freespace, tr_start: presto_e2_trans_start, tr_commit: presto_e2_trans_commit, tr_journal_data: NULL }; #endif /* CONFIG_EXT2_FS */