Re: ext3: default to ordered mode

Re: ext3: default to ordered mode

Posted Aug 19, 2010 11:45 UTC (Thu) by cladisch (✭ supporter ✭, #50193)
In reply to: 2.6.36 merge window: the sequel by renox
Parent article: 2.6.36 merge window: the sequel

From this thread:

Ok, so now I know *why* that one filesystem got busted - I built a
kernel without CONFIG_EXT3_DEFAULTS_TO_ORDERED set and it got a
forced reboot (echo b > proc/sysrq-trigger). That'll teach me for
trying to reproduce bugs Andrew is tripping over with his config
files.
Quite frankly, data=writeback mode for ext3 is a dangerous,
dangerous configuration to run by default. IMO, it shouldn't be the
default. Patch below.

Jan's changelog:

data=writeback mode is dangerous as it leads to higher data loss and stale data
exposure when systems crash. It should not be the default, especially when all
major distros ensure their ext3 filesystems default to ordered mode. Change the
default mode to the safer data=ordered mode, because we should be caring far
more about avoiding stale data exposure than performance.

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