So we keep the behavior of creating reg files with lfsr_file_open +
LFS_O_SYNC, but only clear the desync flag if lfsr_file_open would
mutate the filesystem.
This is hopefully a simpler model to reason about, and makes LFS_O_SYNC
+ LFS_O_DESYNC a bit less weird.
Saves a little bit of code:
code stack ctx
before: 35836 2488 640
after: 35820 (-0.0%) 2480 (-0.3%) 640 (+0.0%)
Christopher Haster
4b87499605