| |
| /* |
| * 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/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 */ |