Hi all, The following patches introduce a new node format(plugin): node41. The new node layout (node41) contains a 32-bit field. This is the single difference from the old node format (node40). The new field will be for meta-data checksums. Currently it is filled with zeros. This is an important example of how to add a plugin to reiser4. Earlier file system developers used to design disk layouts "once and forever". Any change in disk layouts of such poorly designed file systems led to compatibility issues and ugly workarounds. With reiser4 we don't have such problems. Low-level interface to access the new field 1) in reiser4: nh41_get_csum(node41_header *head); nh41_set_csum(node41_header *head, __u32 val); 2) in reiser4progs: nh41_get_csum(reiser4_node_t *node); nh41_set_csum(reiser4_node_t *node, uint32_t val); How to test the new feature: WARNING: don't use it for important data for now!!! . format a reiser4 partition with mkfs option "-o node=node41"; . mount as usual; . use as usual: all previously implemented functionality has to work with the new node41 plugin; . umount; . debugfs.reiser4 -t /dev/xxx prints a new field CSUM for nodes of the new format (0 for now); . fsck has to check/repair file systems with node41 layouts properly. Please, report if any problems, Thanks, Edward. -- To unsubscribe from this list: send the line "unsubscribe reiserfs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
