Re: [PATCH] btrfs,vfs: allow FILE_EXTENT_SAME on a file opened ro

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On Fri, May 20, 2016 at 05:45:12AM +0200, Adam Borowski wrote:
> (Only btrfs currently implements dedupe_file_range.)
> 
> Instead of checking the mode of the file descriptor, let's check whether
> it could have been opened rw.  This allows fixing failures when deduping
> a live system: anyone trying to exec a file currently being deduped gets
> ETXTBSY.
> 
> Issuing this ioctl on a ro file was already allowed for root/cap.

>  fs/read_write.c | 2 +-

I'm unsure whom to bother with this patch.  I've sent it to -btrfs as it's
relevant only to btrfs (at least currently), but technically the file
changed belongs to vfs.  Was CCing -fsdevel enough or should I
retarget/resend the patch?


Apologies for a newbish question.
Meow!
-- 
An imaginary friend squared is a real enemy.
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