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Diffstat (limited to 'src/ring_buf.h')
| -rw-r--r-- | src/ring_buf.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/ring_buf.h b/src/ring_buf.h new file mode 100644 index 0000000..c881ebb --- /dev/null +++ b/src/ring_buf.h @@ -0,0 +1,75 @@ +/*************************************************************************** + * Copyright (C) 2010 by Roberto Maar * + * robi@users.berlios.de * + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + * This program is distributed in the hope that it will be useful, * + * but WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * + * GNU General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * + ***************************************************************************/ +// A special doubly linked ringbuffer for manage journalinode + +#ifndef RING_BUF_H +#define RING_BUF_H + +/* ext3/4 libraries */ +#include <ext2fs/ext2fs.h> + + +typedef struct transaction_range{ +__u32 start; +__u32 end; +} trans_range_t; + + +struct ring_buf_item { + struct ring_buf_item *prev; + struct ring_buf_item *next; + struct ext2_inode_large *inode; + trans_range_t transaction; +}; + +struct ring_buf { + struct ring_buf_item * begin; + int count; + int i_size; + __u32 nr; + char del_flag; + char reuse_flag; +}; + +typedef struct ring_buf_item r_item; + + +static inline r_item* r_first(struct ring_buf *head){ + return (head->count) ? head->begin : NULL ;} + +static inline r_item* r_last(struct ring_buf *head){ + return (head->count) ? head->begin->prev : NULL ; } + +static inline r_item* r_next(r_item *item){ + return item->next;} + +static inline r_item* r_prev(r_item *item){ + return item->prev;} + +static inline int r_get_count(struct ring_buf *head){ + return head->count;} + + +r_item* r_item_new( int ); +struct ring_buf* ring_new( int , __u32); +r_item* r_item_add(struct ring_buf*); +void ring_del(struct ring_buf*); +r_item* r_begin(struct ring_buf*); +#endif |