I am reviewing recent VZ7 libploop commits, in particular, this one:
https://src.openvz.org/projects/OVZ/repos/ploop/commits/36df847b9
I left a question there, let me repeat it here in a hope someone answers.
Igor Sukhihcommitted36df847b99c
<https://src.openvz.org/projects/OVZ/repos/ploop/commits/36df847b99c92557c69255ebfb00d4cc74cb51ac>Yesterday
ploop_copy_init(): open folder with O_DIRECTORY flag
...
- _h->mntfd = open(mnt, O_RDONLY);
+ _h->mntfd = open(mnt, O_RDONLY|O_NONBLOCK|O_DIRECTORY);
1. What's the reason for adding O_NONBLOCK here? As far as I can see, it
doesn't
change anything at all (neither in this open(), nor in subsequent
syncfs(), ioctl()
and close())? I went as far as the kernel sources to check that O_NONBLOCK
doesn't affect syncfs() call, but maybe I'm mistaken?
2. What's the reason for adding O_DIRECTORY? Ideally, the changelog
should say why we're doing it, not what we do (as it's pretty clear
from the patch itself).
Regards,
Kir.
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