Messages in this thread | | | Date | Tue, 2 Nov 1999 12:50:45 +0100 | From | Matthew Wilcox <> | Subject | Re: le32_to_cpu() help... |
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On Wed, Nov 03, 1999 at 02:47:08AM +0800, dony wrote: > I know this. I just don't know what data is in little endian and what data is > in big endian. say the following code .... > > struct ext2_super_block * es; > struct super_block * sb; > .............................. > es->smtime=cpu_to_le32(CURRENT_TIME); //why here use cpu_to_le32? > sb->u.ext2_sb.s_mount_state=le32_to_cpu(es->state); //why use le32_to_cpu here?
ext2's data structures are defined to be kept in little endian form. It enables the exchange of filesystems between machines with differing endianness.
-- Matthew Wilcox <willy@bofh.ai> "Windows and MacOS are products, contrived by engineers in the service of specific companies. Unix, by contrast, is not so much a product as it is a painstakingly compiled oral history of the hacker subculture." - N Stephenson
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