Viewing file:  journal_ext2.c (1.93 KB) -rw-r--r--
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/*
* Intermezzo. (C) 1998 Peter J. Braam
*/
#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_upcall.h>
#include <linux/intermezzo_psdev.h>
#include <linux/intermezzo_kml.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 != PRESTO_OP_UNLINK && op != PRESTO_OP_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);
}
struct journal_ops presto_ext2_journal_ops = {
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 */
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