On 10/23/25 10:34 PM, Tim via users wrote:
On Thu, 2025-10-23 at 15:49 -0600, home user via users wrote:
I have no real use for either feature. They add complexity and risk,
and slow things down.
Just a small point, CoW is supposed to be about minimising risk. Until
the write is successfully completed, the original info still exists.
And it shouldn't be all that often that you're re-writing the same file
that you'd notice the tiny amount of extra effort involved in doing
that (write the new file, elsewhere, then remove the filesystem
pointers to the prior version).
Even without CoW many same file rewrites will have to do a similar set
of steps: Write the new version of the file, update the filesystem
pointers about the different usage of the file storage (new file dates,
extra/less blocks that got used as the file changed size).
This is a good point. ext4 has a log that it writes the change to
before updating the filesystem.
--
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