Richard L. Hamilton writes:
> _FIOSATIME - why doesn't zfs support this (assuming I didn't just miss it)?
> Might be handy for backups.
>
Are these syscall sufficent ?
int utimes(const char *path, const struct timeval times[2]);
int futimesat(int fildes, const char *path, const struct timeval times[2]);
> Could/should zfs support a new ioctl, constrained if needed to files of
> zero size, that sets an explicit (and fixed) blocksize for a particular
> file? That might be useful for performance in special cases when one
> didn't necessarily want to specify (or depend on the specification of
> perhaps) the attribute at the filesystem level. One could imagine a
> database that was itself tunable per-file to a similar range of
> blocksizes, which would almost certainly benefit if it used those sizes
> for the corresponding files. Additional capabilities that might be
> desirable: setting the blocksize to zero to let the system return to
> default behavior for a file; being able to discover the file's blocksize
> (does fstat() report this?) as well as whether it was fixed at the
> filesystem level, at the file level, or in default state.
>
Yep, It does look interesting.
> Wasn't there some work going on to add real per-user (and maybe per-group)
> quotas, so one doesn't necessarily need to be sharing or automounting
> thousands of individual filesystems (slow)? Haven't heard anything lately
> though...
>
What is slow here is mounting all those FS at boot and
unmounting at shutdown. The most relevant project here in my
mind is :
6478980 zfs should support automount property
which would give ZFS a mount on demand behavior. Fast boot/shutdown
and fewer mounted FS at any one time.
Then we need to make administrating many user FS as painless as
administring a single one.
-r
>
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