Re: [PATCH 1/1] vfs: support for COW files in sys_open

[Pavel Machek]

Hi!

> Giving the O_COW flag to open() will return a special error, if
> IS_COW(inode) and write permissions are expressed or implied.  COW-aware
> applications may set this flag and deal with this error according to
> some user defined policy.  This will not change the semantics of any
> existing application or affect any kernel user of open_namei(); nor does
> it affect future applications unless they use O_COW.  Filesystem level
> code is unimplemented except for an ext2 example.

Can you give us overview how this is used? COW for ext2 seems nice...
Is the plan to allow cp -a --cow linux linux.new ?

							Pavel
-- 
Thanks for all the (sleeping) penguins.
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