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

> 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 ?

Thanks for all the (sleeping) penguins.
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