Viewing file:  journal_obdfs.c (5.74 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* Intermezzo. (C) 1998 Peter J. Braam
* Intermezzo. (C) 2000 Red Hat, Inc.
* Intermezzo. (C) 2000 Los Alamos National Laboratory
* Intermezzo. (C) 2000 TurboLinux, Inc.
* Intermezzo. (C) 2001 Mountain View Data, Inc.
*/
#include <linux/types.h>
#include <linux/param.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>
#ifdef CONFIG_OBDFS_FS
#include /usr/src/obd/include/linux/obdfs.h
#endif
#include <linux/intermezzo_fs.h>
#include <linux/intermezzo_upcall.h>
#include <linux/intermezzo_psdev.h>
#include <linux/intermezzo_kml.h>
#ifdef CONFIG_OBDFS_FS
static unsigned long presto_obdfs_freespace(struct presto_file_set *fset,
struct super_block *sb)
{
return 0x0fffff;
}
/* start the filesystem journal operations */
static void *presto_obdfs_trans_start(struct presto_file_set *fset,
struct inode *inode,
int op)
{
return (void *) 1;
}
#if 0
int jblocks;
int trunc_blks, one_path_blks, extra_path_blks,
extra_name_blks, lml_blks;
__u32 avail_kmlblocks;
if ( presto_no_journal(fset) ||
strcmp(fset->fset_cache->cache_type, "ext3"))
{
CDEBUG(D_JOURNAL, "got cache_type \"%s\"\n",
fset->fset_cache->cache_type);
return NULL;
}
avail_kmlblocks = inode->i_sb->u.ext3_sb.s_es->s_free_blocks_count;
if ( avail_kmlblocks < 3 ) {
return ERR_PTR(-ENOSPC);
}
if ( (op != PRESTO_OP_UNLINK && op != PRESTO_OP_RMDIR)
&& avail_kmlblocks < 6 ) {
return ERR_PTR(-ENOSPC);
}
/* Need journal space for:
at least three writes to KML (two one block writes, one a path)
possibly a second name (unlink, rmdir)
possibly a second path (symlink, rename)
a one block write to the last rcvd file
*/
trunc_blks = EXT3_DATA_TRANS_BLOCKS + 1;
one_path_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 3;
lml_blks = 4*EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode) + 2;
extra_path_blks = EXT3_DATA_TRANS_BLOCKS + MAX_PATH_BLOCKS(inode);
extra_name_blks = EXT3_DATA_TRANS_BLOCKS + MAX_NAME_BLOCKS(inode);
/* additional blocks appear for "two pathname" operations
and operations involving the LML records
*/
switch (op) {
case PRESTO_OP_TRUNC:
jblocks = one_path_blks + extra_name_blks + trunc_blks
+ EXT3_DELETE_TRANS_BLOCKS;
break;
case PRESTO_OP_RELEASE:
/*
jblocks = one_path_blks + lml_blks + 2*trunc_blks;
*/
jblocks = one_path_blks;
break;
case PRESTO_OP_SETATTR:
jblocks = one_path_blks + trunc_blks + 1 ;
break;
case PRESTO_OP_CREATE:
jblocks = one_path_blks + trunc_blks
+ EXT3_DATA_TRANS_BLOCKS + 3;
break;
case PRESTO_OP_LINK:
jblocks = one_path_blks + trunc_blks
+ EXT3_DATA_TRANS_BLOCKS;
break;
case PRESTO_OP_UNLINK:
jblocks = one_path_blks + extra_name_blks + trunc_blks
+ EXT3_DELETE_TRANS_BLOCKS;
break;
case PRESTO_OP_SYMLINK:
jblocks = one_path_blks + extra_path_blks + trunc_blks
+ EXT3_DATA_TRANS_BLOCKS + 5;
break;
case PRESTO_OP_MKDIR:
jblocks = one_path_blks + trunc_blks
+ EXT3_DATA_TRANS_BLOCKS + 4;
break;
case PRESTO_OP_RMDIR:
jblocks = one_path_blks + extra_name_blks + trunc_blks
+ EXT3_DELETE_TRANS_BLOCKS;
break;
case PRESTO_OP_MKNOD:
jblocks = one_path_blks + trunc_blks +
EXT3_DATA_TRANS_BLOCKS + 3;
break;
case PRESTO_OP_RENAME:
jblocks = one_path_blks + extra_path_blks + trunc_blks +
2 * EXT3_DATA_TRANS_BLOCKS + 2;
break;
case PRESTO_OP_WRITE:
jblocks = one_path_blks;
/* add this when we can wrap our transaction with
that of ext3_file_write (ordered writes)
+ EXT3_DATA_TRANS_BLOCKS;
*/
break;
default:
CDEBUG(D_JOURNAL, "invalid operation %d for journal\n", op);
return NULL;
}
CDEBUG(D_JOURNAL, "creating journal handle (%d blocks)\n", jblocks);
return journal_start(EXT3_JOURNAL(inode), jblocks);
}
#endif
void presto_obdfs_trans_commit(struct presto_file_set *fset, void *handle)
{
#if 0
if ( presto_no_journal(fset) || !handle)
return;
journal_stop(handle);
#endif
}
void presto_obdfs_journal_file_data(struct inode *inode)
{
#ifdef EXT3_JOURNAL_DATA_FL
inode->u.ext3_i.i_flags |= EXT3_JOURNAL_DATA_FL;
#else
#warning You must have a facility to enable journaled writes for recovery!
#endif
}
struct journal_ops presto_obdfs_journal_ops = {
tr_avail: presto_obdfs_freespace,
tr_start: presto_obdfs_trans_start,
tr_commit: presto_obdfs_trans_commit,
tr_journal_data: presto_obdfs_journal_file_data
};
#endif
|