Kostik Belousov wrote:
On Tue, May 26, 2009 at 10:32:24AM +0400, Menshikov Konstantin wrote:
Hi.
Jail now have no disk quotas.
Users which use jail, use separate zfs or md device for jail, but it
from a hopelessness.
It is necessary to discuss possible ways of realisation.
I suggest to make disk quotas for jail on the basis of the user quotas.
Introduction.
User UID and GID are located in inode and are always accessible.
No information about jail in ufs is present. All activity jail is
limited root path.
The work scheme.
In structure prison it is added structures containing disk quotas and usage.
At start Jail, we calculate the size root path and number of files in
it, thus receiving current use of a disk.
In functions of allocation of disk blocks and inode, we check quotas and
we increase current use.
UFS cannot determine whether the new allocation goes under the jail
root or not.
Yes. But jail cannot allocate block and inode above root path. In
allocation functions, whether for example ffs_alloc we have access to
ucred process and we can check up there is a process in jail.
If jail exceeds a quota, inquiry about allocation of the disk block or
inode it is rejected.
After work end jail the information on disk use is lost.
What do you think about it?
There are other offers?
If jail will get access to disk devices in/dev/and will mount file
system of a problem also will not arise, I think...
Can be eat other problems which are not visible at first sight?
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