journal_ext2.c

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    1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
    2  * vim:expandtab:shiftwidth=8:tabstop=8:
    3  *
    4  *  Copyright (C) 1998 Peter J. Braam <braam@clusterfs.com>
    5  *
    6  *   This file is part of InterMezzo, http://www.inter-mezzo.org.
    7  *
    8  *   InterMezzo is free software; you can redistribute it and/or
    9  *   modify it under the terms of version 2 of the GNU General Public
   10  *   License as published by the Free Software Foundation.
   11  *
   12  *   InterMezzo is distributed in the hope that it will be useful,
   13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15  *   GNU General Public License for more details.
   16  *
   17  *   You should have received a copy of the GNU General Public License
   18  *   along with InterMezzo; if not, write to the Free Software
   19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20  */
   21 
   22 #include <linux/types.h>
   23 #include <linux/kernel.h>
   24 #include <linux/sched.h>
   25 #include <linux/fs.h>
   26 #include <linux/slab.h>
   27 #include <linux/vmalloc.h>
   28 #include <linux/stat.h>
   29 #include <linux/errno.h>
   30 #include <linux/locks.h>
   31 #include <asm/segment.h>
   32 #include <asm/uaccess.h>
   33 #include <linux/string.h>
   34 #include <linux/ext2_fs.h> 
   35 
   36 #include <linux/intermezzo_fs.h>
   37 #include <linux/intermezzo_psdev.h>
   38 
   39 #if defined(CONFIG_EXT2_FS)
   40 
   41 /* EXT2 has no journalling, so these functions do nothing */
   42 static loff_t presto_e2_freespace(struct presto_cache *cache,
   43                                          struct super_block *sb)
   44 {
   45         unsigned long freebl = le32_to_cpu(sb->u.ext2_sb.s_es->s_free_blocks_count);
   46         unsigned long avail =   freebl - le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count);
   47         return (avail <<  EXT2_BLOCK_SIZE_BITS(sb));
   48 }
   49 
   50 /* start the filesystem journal operations */
   51 static void *presto_e2_trans_start(struct presto_file_set *fset, struct inode *inode, int op)
   52 {
   53         __u32 avail_kmlblocks;
   54 
   55         if ( presto_no_journal(fset) ||
   56              strcmp(fset->fset_cache->cache_type, "ext2"))
   57                 return NULL;
   58 
   59         avail_kmlblocks = inode->i_sb->u.ext2_sb.s_es->s_free_blocks_count;
   60         
   61         if ( avail_kmlblocks < 3 ) {
   62                 return ERR_PTR(-ENOSPC);
   63         }
   64         
   65         if (  (op != KML_OPCODE_UNLINK && op != KML_OPCODE_RMDIR)
   66               && avail_kmlblocks < 6 ) {
   67                 return ERR_PTR(-ENOSPC);
   68         }            
   69         return (void *) 1;
   70 }
   71 
   72 static void presto_e2_trans_commit(struct presto_file_set *fset, void *handle)
   73 {
   74         do {} while (0);
   75 }
   76 
   77 static int presto_e2_has_all_data(struct inode *inode)
   78 {
   79         BUG();
   80         return 0;
   81 }
   82 
   83 struct journal_ops presto_ext2_journal_ops = {
   84         tr_all_data: presto_e2_has_all_data,
   85         tr_avail: presto_e2_freespace,
   86         tr_start: presto_e2_trans_start,
   87         tr_commit: presto_e2_trans_commit,
   88         tr_journal_data: NULL
   89 };
   90 
   91 #endif /* CONFIG_EXT2_FS */

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FreeBSD/Linux Kernel Cross Reference sys/fs/intermezzo/journal_ext2.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/intermezzo/journal_ext2.c