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/*
* 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>
#include <linux/smp_lock.h>
#if defined(CONFIG_EXT3_FS) || defined (CONFIG_EXT3_FS_MODULE)
#include <linux/jbd.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>
#endif
#include <linux/intermezzo_fs.h>
#include <linux/intermezzo_upcall.h>
#include <linux/intermezzo_psdev.h>
#include <linux/intermezzo_kml.h>
#if defined(CONFIG_EXT3_FS) || defined (CONFIG_EXT3_FS_MODULE)
#define MAX_PATH_BLOCKS(inode) (PATH_MAX >> EXT3_BLOCK_SIZE_BITS((inode)->i_sb))
#define MAX_NAME_BLOCKS(inode) (NAME_MAX >> EXT3_BLOCK_SIZE_BITS((inode)->i_sb))
/* space requirements:
presto_do_truncate:
used to truncate the KML forward to next fset->chunksize boundary
- zero partial block
- update inode
presto_write_record:
write header (< one block)
write one path (< MAX_PATHLEN)
possibly write another path (< MAX_PATHLEN)
write suffix (< one block)
presto_update_last_rcvd
write one block
*/
static loff_t presto_e3_freespace(struct presto_cache *cache,
struct super_block *sb)
{
loff_t freebl = le32_to_cpu(sb->u.ext3_sb.s_es->s_free_blocks_count);
loff_t avail = freebl -
le32_to_cpu(sb->u.ext3_sb.s_es->s_r_blocks_count);
return (avail << EXT3_BLOCK_SIZE_BITS(sb));
}
/* start the filesystem journal operations */
static void *presto_e3_trans_start(struct presto_file_set *fset,
struct inode *inode,
int op)
{
int jblocks;
int trunc_blks, one_path_blks, extra_path_blks,
extra_name_blks, lml_blks;
__u32 avail_kmlblocks;
handle_t *handle;
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 + 2;
break;
case PRESTO_OP_LINK:
jblocks = one_path_blks + trunc_blks
+ EXT3_DATA_TRANS_BLOCKS + 2;
break;
case PRESTO_OP_UNLINK:
jblocks = one_path_blks + extra_name_blks + trunc_blks
+ EXT3_DELETE_TRANS_BLOCKS + 2;
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 + 2;
break;
case PRESTO_OP_RMDIR:
jblocks = one_path_blks + extra_name_blks + trunc_blks
+ EXT3_DELETE_TRANS_BLOCKS + 1;
break;
case PRESTO_OP_MKNOD:
jblocks = one_path_blks + trunc_blks +
EXT3_DATA_TRANS_BLOCKS + 3 + 2;
break;
case PRESTO_OP_RENAME:
jblocks = one_path_blks + extra_path_blks + trunc_blks +
2 * EXT3_DATA_TRANS_BLOCKS + 2 + 3;
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);
/* journal_start/stop does not do its own locking while updating
* the handle/transaction information. Hence we create our own
* critical section to protect these calls. -SHP
*/
lock_kernel();
handle = journal_start(EXT3_JOURNAL(inode), jblocks);
unlock_kernel();
return handle;
}
void presto_e3_trans_commit(struct presto_file_set *fset, void *handle)
{
if ( presto_no_journal(fset) || !handle)
return;
/* See comments before journal_start above. -SHP */
lock_kernel();
journal_stop(handle);
unlock_kernel();
}
void presto_e3_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_ext3_journal_ops = {
tr_avail: presto_e3_freespace,
tr_start: presto_e3_trans_start,
tr_commit: presto_e3_trans_commit,
tr_journal_data: presto_e3_journal_file_data
};
#endif /* CONFIG_EXT3_FS */
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