Callum Lerwick wrote:
On Sat, 2008-12-27 at 12:00 -0600, Eric Sandeen wrote:
> On a 256mb filesystem the journal will only be 32mb by default. Still a
> chunk of the fs, but not half! :)
Hmmm, I think this has changed over the years, but it seems the recent
code looks like this:
int ext2fs_default_journal_size(__u64 blocks)
{
if (blocks < 2048)
return -1;
if (blocks < 32768)
return (1024);
if (blocks < 256*1024)
return (4096);
if (blocks < 512*1024)
return (8192);
if (blocks < 1024*1024)
return (16384);
return 32768;
}
It's based on block size. So on a 256mb filesystem, the block size
defaults to 1k, and you get an 8mb journal.
You're right, I used 4k blocks in my napkin-sketch, oops :)
-Eric